From 39bde1a5c90147b892c640170d6c6c16cca996a8 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:31:32 +0800
Subject: [PATCH 01/62] feat: query file applications for sidebar opening
 (#4562)

---
 packages/api/session-controller/src/index.ts  | 45 ++++++++--
 packages/api/session-controller/src/types.ts  |  6 ++
 .../src/client/OpenPathAction.module.css      |  7 ++
 .../src/client/OpenPathAction.tsx             | 48 +++++++++--
 .../client/ui-open-in-app/src/client/index.ts |  3 +-
 .../ui-open-in-app/src/client/locales.ts      |  4 +
 .../ui-open-in-app/src/client/open-path.ts    | 26 +++++-
 .../tests/browser-plugin.client.spec.ts       |  1 +
 .../tests/open-path-action.client.spec.tsx    |  1 +
 .../tests/open-path.client.spec.ts            | 16 ++++
 .../native-command/src/file-applications.ts   | 86 +++++++++++++++++++
 packages/util/native-command/src/index.ts     |  3 +
 .../tests/file-applications.spec.ts           | 37 ++++++++
 13 files changed, 262 insertions(+), 21 deletions(-)
 create mode 100644 packages/util/native-command/src/file-applications.ts
 create mode 100644 packages/util/native-command/tests/file-applications.spec.ts

diff --git a/packages/api/session-controller/src/index.ts b/packages/api/session-controller/src/index.ts
index b6f5f0dfa0..0f0a44339d 100644
--- a/packages/api/session-controller/src/index.ts
+++ b/packages/api/session-controller/src/index.ts
@@ -8,7 +8,7 @@ import { Context } from '@deepseek-ai/cordis'
 import z from '@deepseek-ai/schemastery'
 import { errorChain } from '@deepseek-ai/dsh-llm'
 import type {} from '@deepseek-ai/dsh-client-file-upload'
-import { canOpenNativePath, nativeFileManager, openNativeAssociatedPath, revealNativePath } from '@deepseek-ai/dsh-native-command'
+import { canOpenNativePath, nativeFileManager, nativeFileApplications, openNativeFileApplication, openNativeAssociatedPath, revealNativePath, type NativeFileApplication } from '@deepseek-ai/dsh-native-command'
 import type { SessionId } from '@deepseek-ai/dsh-session'
 import type { SessionInspection } from '@deepseek-ai/dsh-session-persistence'
 import { SessionQueryError, type SessionObservation } from '@deepseek-ai/dsh-session-query'
@@ -83,6 +83,9 @@ export interface Config {
 export interface SessionControllerInternals {
   /** Native default-application handoff. */
   readonly openPath?: (path: string, signal: AbortSignal) => Promise<void>
+  /** Native file-association query and explicit application handoff. */
+  readonly fileApplications?: typeof nativeFileApplications
+  readonly openFileApplication?: typeof openNativeFileApplication
   /** Native file-manager handoff. */
   readonly revealPath?: (path: string, signal: AbortSignal) => Promise<void>
   /** Native handoff availability probe. */
@@ -115,6 +118,8 @@ export class SessionController extends TypertRemoteService {
   private readonly history: SessionHistoryController
   private readonly listState: ApiSessionList
   private readonly openPath: (path: string, signal: AbortSignal) => Promise<void>
+  private readonly fileApplications: typeof nativeFileApplications
+  private readonly openFileApplication: typeof openNativeFileApplication
   private readonly revealPath: (path: string, signal: AbortSignal) => Promise<void>
   private readonly canOpenPath: () => boolean
   private readonly promotions = new Set<Promise<void>>()
@@ -142,6 +147,8 @@ export class SessionController extends TypertRemoteService {
     }, 'session-controller.promotions')
     this.history = new SessionHistoryController(ctx, (observation) => { this.promote(observation) })
     this.listState = new ApiSessionList(ctx)
+    this.fileApplications = internals.fileApplications ?? nativeFileApplications
+    this.openFileApplication = internals.openFileApplication ?? openNativeFileApplication
     this.openPath = internals.openPath ?? openNativeAssociatedPath
     this.revealPath = internals.revealPath ?? revealNativePath
     this.canOpenPath = internals.canOpenPath
@@ -318,14 +325,9 @@ export class SessionController extends TypertRemoteService {
     }
     signal.throwIfAborted()
     try {
-      const hostPath = resolve(request.path)
-      const { fs } = this.ctx
-      const mapped = fs.processPathFromHostPath(hostPath)
-      if (mapped === undefined || fs.processPath(await fs.resolve(mapped, { signal })) !== hostPath) {
-        throw new Error('Path has no verified Host path')
-      }
-      signal.throwIfAborted()
+      await this.verifyDesktopPath(request.path, signal)
       if (request.action === 'reveal') await this.revealPath(request.path, signal)
+      else if (request.application !== undefined) await this.openFileApplication(resolve(request.path), request.application, signal)
       else await this.openPath(request.path, signal)
       return { opened: true }
     } catch (error: unknown) {
@@ -338,6 +340,33 @@ export class SessionController extends TypertRemoteService {
     }
   }
 
+  /**
+   * Query current file handlers on the serving desktop without activating an Agent.
+   * @param request - file path in Host filesystem syntax.
+   * @param signal - caller lifetime, propagated to filesystem and desktop queries.
+   * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+   */
+  @Remote('workspacePathApplications')
+  async workspacePathApplications(
+    request: { readonly path: string }, signal: AbortSignal,
+  ): Promise<readonly NativeFileApplication[]> {
+    if (!this.canOpenPath()) return []
+    await this.verifyDesktopPath(request.path, signal)
+    return this.fileApplications(resolve(request.path), signal)
+  }
+
+  private async verifyDesktopPath(path: string, signal: AbortSignal): Promise<void> {
+    if (path.length === 0) throw new RemoteError('gateway/bad-request', 'A non-empty file path is required', {})
+    signal.throwIfAborted()
+    const hostPath = resolve(path)
+    const { fs } = this.ctx
+    const mapped = fs.processPathFromHostPath(hostPath)
+    if (mapped === undefined || fs.processPath(await fs.resolve(mapped, { signal })) !== hostPath) {
+      throw new RemoteError('gateway/bad-request', 'Path has no verified Host path', {})
+    }
+    signal.throwIfAborted()
+  }
+
   /**
    * Rename one Session after explicitly resuming it.
    * @param request - Session identity and proposed title.
diff --git a/packages/api/session-controller/src/types.ts b/packages/api/session-controller/src/types.ts
index a925e9da83..ac155e7ab5 100644
--- a/packages/api/session-controller/src/types.ts
+++ b/packages/api/session-controller/src/types.ts
@@ -1,3 +1,4 @@
+import type { NativeFileApplication } from '@deepseek-ai/dsh-native-command'
 /** Browser-safe request, result, and lifecycle vocabulary for the Session Remote service. */
 
 import type {
@@ -367,6 +368,8 @@ export interface SessionCancelValue {
 export interface SessionOpenWorkspacePathRequest {
   /** File-manager navigation when requested; omission uses the default application. */
   readonly action?: 'reveal'
+  /** Registered application path; omission preserves the operating system default. */
+  readonly application?: string
   /** Path after best-effort Session workspace resolution, in Host filesystem syntax. */
   readonly path: string
 }
@@ -610,3 +613,6 @@ declare module '@deepseek-ai/cordis' {
 
 /** JSON-compatible projection value accepted by list consumers. */
 export type SessionProjectionValue = JsonValue
+
+/** Application metadata returned by the serving desktop for one file. */
+export type SessionWorkspacePathApplication = NativeFileApplication
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css b/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css
index f23f590613..2c770905cf 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css
@@ -33,6 +33,7 @@
 }
 
 .main {
+  gap: 4px;
   padding: 5px 8px 5px 10px;
 }
 
@@ -54,3 +55,9 @@
 .chevron:disabled {
   cursor: default;
 }
+
+.appIcon {
+  width: 16px;
+  height: 16px;
+  object-fit: contain;
+}
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index bc7f842386..af45eb7d1e 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -3,11 +3,12 @@
  * its default application, the chevron's menu adds the file-manager reveal.
  * Both path controls share the gesture hook declared here.
  */
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import type { ReactNode } from 'react'
 import {
   IconChevronDownOutlineRegular, IconFolderOpenOutlineRegular, IconRightUpOutlineRegular, Menu, Tooltip,
 } from '@deepseek-ai/dsh-client-ui-primitives'
+import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
 import type { InjectFace, PropsLocale, PropsRuntime, TranslateNS } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client'
@@ -22,7 +23,8 @@ export interface OpenPathInjected {
     openInAppDesktop: ObservableSnapshot<boolean | null>
   }
   loadDesktop: () => Promise<void>
-  openPath: (path: string, action: OpenInAppPathAction) => Promise<OpenInAppPathFailure | null>
+  openPath: (path: string, action: OpenInAppPathAction, application?: string) => Promise<OpenInAppPathFailure | null>
+  applications: (path: string, signal: AbortSignal) => Promise<readonly SessionWorkspacePathApplication[] | null>
 }
 
 /** Full props of the document-header contribution. */
@@ -48,10 +50,11 @@ export function usePathGesture({ absolutePath, useOpenInAppDesktop, loadDesktop,
   available: boolean
   pending: boolean
   toast: ReactNode
-  act: (action: OpenInAppPathAction) => void
+  act: (action: OpenInAppPathAction, application?: string) => void
 } {
   const desktop = useOpenInAppDesktop(value => value)
   const [pending, setPending] = useState(false)
+  const inFlight = useRef(false)
   const { toast, show } = useOpenFailureToast()
   useEffect(() => {
     if (desktop === null) void loadDesktop()
@@ -60,11 +63,13 @@ export function usePathGesture({ absolutePath, useOpenInAppDesktop, loadDesktop,
     available: desktop === true,
     pending,
     toast,
-    act: (action) => {
+    act: (action, application) => {
+      if (inFlight.current) return
+      inFlight.current = true
       setPending(true)
-      void openPath(absolutePath, action).then((failure) => {
+      void openPath(absolutePath, action, application).then((failure) => {
         if (failure !== null) show(t(`path.${failure}`))
-      }).finally(() => { setPending(false) })
+      }).finally(() => { inFlight.current = false; setPending(false) })
     },
   }
 }
@@ -78,10 +83,24 @@ export function OpenPathAction(props: OpenPathActionProps): ReactNode {
   const { t } = props
   const [menuOpen, setMenuOpen] = useState(false)
   const { available, pending, toast, act } = usePathGesture(props)
+  const [association, setAssociation] = useState<{
+    path: string
+    apps: readonly SessionWorkspacePathApplication[] | null
+  } | null>(null)
+  useEffect(() => {
+    if (!available) return
+    const controller = new AbortController()
+    void props.applications(props.absolutePath, controller.signal).then((apps) => {
+      if (!controller.signal.aborted) setAssociation({ path: props.absolutePath, apps })
+    })
+    return () => { controller.abort() }
+  }, [available, props.absolutePath, props.applications, menuOpen])
+  const apps = association?.path === props.absolutePath ? association.apps : null
+  const preferred = apps?.find(app => app.default)
   if (!available) return null
-  const run = (action: OpenInAppPathAction): void => {
+  const run = (action: OpenInAppPathAction, application?: string): void => {
     setMenuOpen(false)
-    act(action)
+    act(action, application)
   }
   return (
     <>
@@ -95,9 +114,19 @@ export function OpenPathAction(props: OpenPathActionProps): ReactNode {
         onClose={() => { setMenuOpen(false) }}
         items={[
           { id: 'open', icon: <IconRightUpOutlineRegular />, label: t('path.defaultApp') },
+          ...(apps ?? []).map(app => ({
+            id: `app:${app.id}`,
+            icon: app.icon === null ? <IconRightUpOutlineRegular /> : <img src={app.icon} className={css.appIcon} alt="" />,
+            label: app.default ? t('path.appDefault', { app: app.name }) : app.name,
+          })),
+          ...(association?.path === props.absolutePath && apps === null
+            ? [{ id: 'unavailable', label: t('path.appsError'), disabled: true }] : []),
           { id: 'reveal', icon: <IconFolderOpenOutlineRegular />, label: t('path.reveal') },
         ]}
-        onSelect={(id) => { run(id === 'reveal' ? 'reveal' : 'open') }}
+        onSelect={(id) => {
+          if (id.startsWith('app:')) run('open', id.slice(4))
+          else if (id === 'open' || id === 'reveal') run(id)
+        }}
         anchor={(
           <div className={css.split} data-open-path data-state={pending ? 'busy' : 'idle'}>
             <Tooltip label={t('path.open.tooltip')} side="bottom" delayMs={500}>
@@ -108,6 +137,7 @@ export function OpenPathAction(props: OpenPathActionProps): ReactNode {
                 data-open-path-open
                 onClick={() => { run('open') }}
               >
+                {preferred?.icon != null && <img src={preferred.icon} className={css.appIcon} alt="" />}
                 {t('path.open')}
               </button>
             </Tooltip>
diff --git a/packages/client/ui-open-in-app/src/client/index.ts b/packages/client/ui-open-in-app/src/client/index.ts
index 4073eaec1f..44572cdf3d 100644
--- a/packages/client/ui-open-in-app/src/client/index.ts
+++ b/packages/client/ui-open-in-app/src/client/index.ts
@@ -68,7 +68,8 @@ export function apply(ctx: ClientContext): void {
   const pathInjected = (): OpenPathInjected => ({
     hooks: { openInAppDesktop: paths.desktop },
     loadDesktop: () => paths.load(),
-    openPath: (path, action) => paths.openPath(path, action),
+    openPath: (path, action, application) => paths.openPath(path, action, application),
+    applications: (path, signal) => paths.applications(path, signal),
   })
   ctx.slots.inject('sidebar.right.tab.document.actions', () => ctx.slots.register({
     name: 'sidebar.right.tab.document.actions',
diff --git a/packages/client/ui-open-in-app/src/client/locales.ts b/packages/client/ui-open-in-app/src/client/locales.ts
index 6d32f759a0..bb198d640c 100644
--- a/packages/client/ui-open-in-app/src/client/locales.ts
+++ b/packages/client/ui-open-in-app/src/client/locales.ts
@@ -44,6 +44,8 @@ export const zh = {
   'open.error': '打开失败',
   'menu.toggle': '选择打开方式',
   'menu.aria': '打开方式',
+  'path.appDefault': '{app}（默认）',
+  'path.appsError': '无法获取应用列表',
   'path.open': '打开',
   'path.open.tooltip': '用默认应用打开',
   'path.more': '更多打开方式',
@@ -66,6 +68,8 @@ export const en: Record<OpenInAppKey, string> = {
   'open.error': 'Failed to open',
   'menu.toggle': 'Choose an app to open in',
   'menu.aria': 'Open in',
+  'path.appDefault': '{app} (default)',
+  'path.appsError': 'Could not load applications',
   'path.open': 'Open',
   'path.open.tooltip': 'Open in default app',
   'path.more': 'More ways to open',
diff --git a/packages/client/ui-open-in-app/src/client/open-path.ts b/packages/client/ui-open-in-app/src/client/open-path.ts
index 161fcf104f..3c44e54a23 100644
--- a/packages/client/ui-open-in-app/src/client/open-path.ts
+++ b/packages/client/ui-open-in-app/src/client/open-path.ts
@@ -5,7 +5,7 @@
  */
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { RemoteResult } from '@deepseek-ai/dsh-api-remotes/client'
-import type { SessionOpenWorkspacePathRequest } from '@deepseek-ai/dsh-api-session-controller/types'
+import type { SessionOpenWorkspacePathRequest, SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
 
 /** What a path gesture asks of the Host desktop: the default application, or the file manager showing the file. */
 export type OpenInAppPathAction = 'open' | 'reveal'
@@ -18,6 +18,9 @@ export interface OpenInAppPathRemote {
   readonly session: {
     /** Whether the Host can hand a workspace path to a native desktop. */
     canOpenWorkspacePath(): Promise<RemoteResult<boolean>>
+    workspacePathApplications(
+      request: { path: string }, signal?: AbortSignal,
+    ): Promise<RemoteResult<readonly SessionWorkspacePathApplication[]>>
     /** Open one Host path in its default application, or reveal it in the file manager. */
     openWorkspacePath(request: SessionOpenWorkspacePathRequest, signal?: AbortSignal): Promise<RemoteResult<unknown>>
   }
@@ -47,10 +50,11 @@ export class OpenInAppPathController {
    * Open one Host path in its default application, or reveal it in the file manager.
    * @param path - absolute path on the Host, as the file's metadata reports it.
    * @param action - default application open, or file-manager reveal.
+   * @param application - registered application path for an explicit open.
    * @returns the failure kind to announce, or `null` once the Host acknowledged.
    */
-  async openPath(path: string, action: OpenInAppPathAction): Promise<OpenInAppPathFailure | null> {
-    const request: SessionOpenWorkspacePathRequest = action === 'reveal' ? { path, action } : { path }
+  async openPath(path: string, action: OpenInAppPathAction, application?: string): Promise<OpenInAppPathFailure | null> {
+    const request: SessionOpenWorkspacePathRequest = action === 'reveal' ? { path, action } : { path, ...(application === undefined ? {} : { application }) }
     let ok = false
     try {
       ok = (await this.remote.session.openWorkspacePath(request)).ok
@@ -61,6 +65,22 @@ export class OpenInAppPathController {
     return ok ? null : action === 'open' ? 'openError' : 'revealError'
   }
 
+  /**
+   * Refresh the file's OS associations; failures remain distinct from an empty handler list.
+   * @param path - file path reported by the Host.
+   * @param signal - lifetime of the requesting preview.
+   * @returns application metadata, or null when the query fails.
+   */
+  async applications(path: string, signal: AbortSignal): Promise<readonly SessionWorkspacePathApplication[] | null> {
+    try {
+      const result = await this.remote.session.workspacePathApplications({ path }, signal)
+      return result.ok ? result.value : null
+    } catch (_error) {
+      // Carrier failure leaves default opening available while the menu reports the failed query.
+      return null
+    }
+  }
+
   private async run(): Promise<void> {
     let available = false
     try {
diff --git a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
index dab2b08df0..14dc706604 100644
--- a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
@@ -24,6 +24,7 @@ afterEach(() => {
 /** The Session Remote slice the path controls call; answers a desktop and acknowledges every gesture. */
 const remote = {
   session: {
+    workspacePathApplications: vi.fn(async () => ({ ok: true as const, value: [] })),
     canOpenWorkspacePath: vi.fn(async () => ({ ok: true as const, value: true })),
     openWorkspacePath: vi.fn(async () => ({ ok: true as const, value: { opened: true as const } })),
   },
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index ae9803c164..fd408119fd 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -40,6 +40,7 @@ function bench(over: { desktop?: boolean | null; openPath?: Bench['openPath'] }
     absolutePath: ABSOLUTE_PATH,
     useOpenInAppDesktop: useSelector(desktop),
     loadDesktop,
+    applications: vi.fn(async () => []),
     openPath,
     t,
   } as unknown as Bench['props']
diff --git a/packages/client/ui-open-in-app/tests/open-path.client.spec.ts b/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
index 2e8560f7cf..1b1702cc2f 100644
--- a/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
@@ -10,6 +10,7 @@ type SessionRemote = OpenInAppPathRemote['session']
 function remoteOf(over: Partial<SessionRemote> = {}): OpenInAppPathRemote {
   return {
     session: {
+      workspacePathApplications: async () => ({ ok: true, value: [] }),
       canOpenWorkspacePath: async () => ({ ok: true, value: true }),
       openWorkspacePath: async () => ({ ok: true, value: { opened: true } }),
       ...over,
@@ -69,3 +70,18 @@ describe('OpenInAppPathController gestures', () => {
     expect(await rejecting.openPath('/w/clip.mp4', 'open')).toBe('openError')
   })
 })
+
+
+it('queries current handlers and carries an explicit application without changing the default gesture', async () => {
+  const applications = [{ id: '/Applications/Music.app', name: 'Music', default: true, icon: null }]
+  const query = vi.fn(async () => ({ ok: true as const, value: applications }))
+  const open = vi.fn(async () => ({ ok: true as const, value: { opened: true } }))
+  const controller = new OpenInAppPathController(remoteOf({ workspacePathApplications: query, openWorkspacePath: open }))
+  const signal = new AbortController().signal
+  expect(await controller.applications('/file.mp3', signal)).toEqual(applications)
+  expect(query).toHaveBeenCalledWith({ path: '/file.mp3' }, signal)
+  await controller.openPath('/file.mp3', 'open', '/Applications/Music.app')
+  expect(open).toHaveBeenLastCalledWith({ path: '/file.mp3', application: '/Applications/Music.app' })
+  await controller.openPath('/file.mp3', 'open')
+  expect(open).toHaveBeenLastCalledWith({ path: '/file.mp3' })
+})
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
new file mode 100644
index 0000000000..830b8557d6
--- /dev/null
+++ b/packages/util/native-command/src/file-applications.ts
@@ -0,0 +1,86 @@
+/** Native file associations queried from the desktop that owns the path. */
+import { runNativeCommand } from './runner.ts'
+import type { PathOpenerInternals } from './path-opener.ts'
+
+/** One OS-registered application capable of opening the requested file. */
+export interface NativeFileApplication {
+  /** OS application identifier; callers must revalidate it against the file's current handlers before opening. */
+  readonly id: string
+  readonly name: string
+  readonly default: boolean
+  /** PNG data URL, or null when the desktop supplies no icon. */
+  readonly icon: string | null
+}
+
+/** AppKit runs inside the system JXA host; paths arrive as argv, never executable source. */
+const MAC_APPLICATIONS = `
+ObjC.import('AppKit');
+function run(argv) {
+  var workspace = $.NSWorkspace.sharedWorkspace;
+  var file = $.NSURL.fileURLWithPath(argv[0]);
+  var preferred = workspace.URLForApplicationToOpenURL(file);
+  var preferredPath = preferred.isNil() ? null : ObjC.unwrap(preferred.path);
+  var urls = workspace.URLsForApplicationsToOpenURL(file);
+  var apps = [];
+  for (var i = 0; i < urls.count; i++) {
+    var url = urls.objectAtIndex(i);
+    var path = ObjC.unwrap(url.path);
+    var icon = workspace.iconForFile(path);
+    var bitmap = $.NSBitmapImageRep.imageRepWithData(icon.TIFFRepresentation);
+    var png = bitmap.representationUsingTypeProperties($.NSBitmapImageFileTypePNG, $({}));
+    apps.push({
+      id: path,
+      name: ObjC.unwrap($.NSFileManager.defaultManager.displayNameAtPath(path)),
+      default: path === preferredPath,
+      icon: png.isNil() ? null : 'data:image/png;base64,' + ObjC.unwrap(png.base64EncodedStringWithOptions(0))
+    });
+  }
+  return JSON.stringify(apps);
+}`
+
+/**
+ * List registered handlers in OS preference order, including the current default and application icons.
+ * @param path - verified absolute local file path.
+ * @param signal - caller lifetime, propagated to the OS query.
+ * @param internals - platform and command adapter for deterministic tests.
+ * @returns current file handlers; an empty list when the platform has no association query.
+ */
+export async function nativeFileApplications(
+  path: string, signal: AbortSignal, internals: PathOpenerInternals = {},
+): Promise<readonly NativeFileApplication[]> {
+  signal.throwIfAborted()
+  const platform = internals.platform ?? process.platform
+  if (platform !== 'darwin') return []
+  const run = internals.run ?? runNativeCommand
+  const { stdout } = await run('/usr/bin/osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, path], signal)
+  const value: unknown = JSON.parse(stdout)
+  if (!Array.isArray(value)) throw new Error('Invalid native application list')
+  const applications: NativeFileApplication[] = []
+  for (const entry of value) {
+    if (typeof entry !== 'object' || entry === null
+      || typeof entry.id !== 'string' || entry.id.length === 0
+      || typeof entry.name !== 'string' || typeof entry.default !== 'boolean'
+      || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/png;base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
+      throw new Error('Invalid native application entry')
+    }
+    applications.push({ id: entry.id, name: entry.name, default: entry.default, icon: entry.icon })
+  }
+  return applications
+}
+
+/**
+ * Open a file in a currently registered handler; stale or arbitrary application identifiers are rejected.
+ * @param path - verified absolute local file path.
+ * @param application - identifier returned by the file association query.
+ * @param signal - caller lifetime, propagated to query and launch.
+ * @param internals - platform and command adapter for deterministic tests.
+ * @returns after the system launcher accepts the file.
+ */
+export async function openNativeFileApplication(
+  path: string, application: string, signal: AbortSignal, internals: PathOpenerInternals = {},
+): Promise<void> {
+  const apps = await nativeFileApplications(path, signal, internals)
+  if (!apps.some(app => app.id === application)) throw new Error('Application is not registered for this file')
+  const run = internals.run ?? runNativeCommand
+  await run('/usr/bin/open', ['-a', application, path], signal)
+}
diff --git a/packages/util/native-command/src/index.ts b/packages/util/native-command/src/index.ts
index 29a0f16c18..ea948a745b 100644
--- a/packages/util/native-command/src/index.ts
+++ b/packages/util/native-command/src/index.ts
@@ -18,3 +18,6 @@ export type {
   PathOpenerInternals,
   PathOpenerRunner,
 } from './path-opener.ts'
+
+export { nativeFileApplications, openNativeFileApplication } from './file-applications.ts'
+export type { NativeFileApplication } from './file-applications.ts'
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
new file mode 100644
index 0000000000..b6f2e3328c
--- /dev/null
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -0,0 +1,37 @@
+/** File association results and explicit handler authorization at the native command adapter. */
+import { describe, expect, it, vi } from 'vitest'
+import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
+
+const application = { id: '/Applications/Music.app', name: 'Music', default: true, icon: null }
+const signal = new AbortController().signal
+
+describe('native file associations', () => {
+  it('passes file paths as arguments and preserves the desktop default', async () => {
+    const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
+    const path = '/tmp/中文 $(touch nope).mp3'
+    await expect(nativeFileApplications(path, signal, { platform: 'darwin', run })).resolves.toEqual([application])
+    expect(run).toHaveBeenCalledWith('/usr/bin/osascript', ['-l', 'JavaScript', '-e', expect.any(String), path], signal)
+  })
+
+  it.each(['{}', '[null]', '[{"id":1}]', JSON.stringify([{ ...application, icon: 'javascript:alert(1)' }])])('rejects malformed native output %s', async (stdout) => {
+    await expect(nativeFileApplications('/file.mp3', signal, {
+      platform: 'darwin', run: async () => ({ stdout, stderr: '' }),
+    })).rejects.toThrow()
+  })
+
+  it('launches only a currently registered application with argv', async () => {
+    const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
+    await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin', run })
+    expect(run).toHaveBeenLastCalledWith('/usr/bin/open', ['-a', application.id, '/file.mp3'], signal)
+    run.mockClear()
+    await expect(openNativeFileApplication('/file.mp3', '/arbitrary.app', signal, { platform: 'darwin', run })).rejects.toThrow('not registered')
+    expect(run).toHaveBeenCalledOnce()
+  })
+
+  it('does not query after cancellation or on unsupported platforms', async () => {
+    const run = vi.fn()
+    await expect(nativeFileApplications('/file.mp3', signal, { platform: 'freebsd', run })).resolves.toEqual([])
+    await expect(nativeFileApplications('/file.mp3', AbortSignal.abort(), { platform: 'darwin', run })).rejects.toThrow()
+    expect(run).not.toHaveBeenCalled()
+  })
+})

From d6d9d47c4929a7eff2ed27184f822814105acd35 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:32:57 +0800
Subject: [PATCH 02/62] fix: constrain application icon pixels before transport

---
 .../ui-open-in-app/tests/open-path-action.client.spec.tsx | 8 ++++----
 packages/util/native-command/src/file-applications.ts     | 6 +++++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index fd408119fd..b2a14bca11 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -66,10 +66,10 @@ describe('OpenPathAction gestures', () => {
     render(<OpenPathAction {...b.props} />)
     const main = screen.getByRole('button', { name: zh['path.open'] })
     await act(async () => { fireEvent.click(main) })
-    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open')
+    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
     fireEvent.click(screen.getByRole('button', { name: zh['path.more'] }))
     await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.reveal'] })) })
-    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal')
+    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
     expect(screen.queryByRole('menu')).toBeNull()
   })
 
@@ -84,7 +84,7 @@ describe('OpenPathAction gestures', () => {
     expect(b.openPath).not.toHaveBeenCalled()
     fireEvent.click(more)
     await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
-    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open')
+    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
   })
 
   it('disables both halves while its own gesture settles and leaves no failure on the control', async () => {
@@ -113,7 +113,7 @@ describe('OpenPathEmptyAction', () => {
     const b = bench()
     render(<OpenPathEmptyAction {...b.props} />)
     await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.unpreviewable'] })) })
-    expect(b.openPath).toHaveBeenCalledWith(ABSOLUTE_PATH, 'open')
+    expect(b.openPath).toHaveBeenCalledWith(ABSOLUTE_PATH, 'open', undefined)
     expect(screen.queryByRole('alert')).toBeNull()
   })
 
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index 830b8557d6..7777a7f6fc 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -26,7 +26,11 @@ function run(argv) {
     var url = urls.objectAtIndex(i);
     var path = ObjC.unwrap(url.path);
     var icon = workspace.iconForFile(path);
-    var bitmap = $.NSBitmapImageRep.imageRepWithData(icon.TIFFRepresentation);
+    var thumbnail = $.NSImage.alloc.initWithSize($.NSMakeSize(32, 32));
+    thumbnail.lockFocus;
+    icon.drawInRectFromRectOperationFraction($.NSMakeRect(0, 0, 32, 32), $.NSZeroRect, $.NSCompositingOperationSourceOver, 1);
+    thumbnail.unlockFocus;
+    var bitmap = $.NSBitmapImageRep.imageRepWithData(thumbnail.TIFFRepresentation);
     var png = bitmap.representationUsingTypeProperties($.NSBitmapImageFileTypePNG, $({}));
     apps.push({
       id: path,

From 97877bd8b48a9e0440868aa717558940d5db2071 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:34:24 +0800
Subject: [PATCH 03/62] test: cover file handler selection and shared path
 authorization

---
 packages/api/session-controller/src/index.ts  |  5 +++--
 packages/api/session-controller/src/types.ts  |  2 +-
 .../session-open-workspace-path.host.spec.ts  | 22 +++++++++++++++++++
 .../session-controller/tests/test-remote.ts   |  5 +++++
 .../tests/open-path-action.client.spec.tsx    | 19 ++++++++++++++++
 packages/util/native-command/package.json     |  5 ++++-
 .../native-command/src/file-applications.ts   | 12 +++-------
 packages/util/native-command/src/types.ts     | 11 ++++++++++
 8 files changed, 68 insertions(+), 13 deletions(-)
 create mode 100644 packages/util/native-command/src/types.ts

diff --git a/packages/api/session-controller/src/index.ts b/packages/api/session-controller/src/index.ts
index 0f0a44339d..0658b01127 100644
--- a/packages/api/session-controller/src/index.ts
+++ b/packages/api/session-controller/src/index.ts
@@ -8,7 +8,7 @@ import { Context } from '@deepseek-ai/cordis'
 import z from '@deepseek-ai/schemastery'
 import { errorChain } from '@deepseek-ai/dsh-llm'
 import type {} from '@deepseek-ai/dsh-client-file-upload'
-import { canOpenNativePath, nativeFileManager, nativeFileApplications, openNativeFileApplication, openNativeAssociatedPath, revealNativePath, type NativeFileApplication } from '@deepseek-ai/dsh-native-command'
+import { canOpenNativePath, nativeFileManager, nativeFileApplications, openNativeFileApplication, openNativeAssociatedPath, revealNativePath } from '@deepseek-ai/dsh-native-command'
 import type { SessionId } from '@deepseek-ai/dsh-session'
 import type { SessionInspection } from '@deepseek-ai/dsh-session-persistence'
 import { SessionQueryError, type SessionObservation } from '@deepseek-ai/dsh-session-query'
@@ -29,6 +29,7 @@ import { SessionSkillCatalog } from './skill-catalog.ts'
 import { SessionMediaReferences } from './media-references.ts'
 import type {
   ModelCatalog,
+  SessionWorkspacePathApplication,
   SessionAttachmentRequest,
   SessionAttachmentValue,
   SessionCancelRequest,
@@ -349,7 +350,7 @@ export class SessionController extends TypertRemoteService {
   @Remote('workspacePathApplications')
   async workspacePathApplications(
     request: { readonly path: string }, signal: AbortSignal,
-  ): Promise<readonly NativeFileApplication[]> {
+  ): Promise<readonly SessionWorkspacePathApplication[]> {
     if (!this.canOpenPath()) return []
     await this.verifyDesktopPath(request.path, signal)
     return this.fileApplications(resolve(request.path), signal)
diff --git a/packages/api/session-controller/src/types.ts b/packages/api/session-controller/src/types.ts
index ac155e7ab5..e238e518b5 100644
--- a/packages/api/session-controller/src/types.ts
+++ b/packages/api/session-controller/src/types.ts
@@ -1,4 +1,4 @@
-import type { NativeFileApplication } from '@deepseek-ai/dsh-native-command'
+import type { NativeFileApplication } from '@deepseek-ai/dsh-native-command/types'
 /** Browser-safe request, result, and lifecycle vocabulary for the Session Remote service. */
 
 import type {
diff --git a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
index 6a14c7761d..63df8886bd 100644
--- a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
+++ b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
@@ -215,3 +215,25 @@ it('dispatches default-app opening to the association adapter', async () => {
   await controller.openWorkspacePath({ path: '/report.html' }, signal)
   expect(open).toHaveBeenCalledWith('/report.html', signal)
 })
+
+
+it('uses the same path verification for handler queries and explicit application opening', async () => {
+  const ctx = await context()
+  const applications = [{ id: '/Applications/Music.app', name: 'Music', default: true, icon: null }]
+  const fileApplications = vi.fn(async () => applications)
+  const openFileApplication = vi.fn(async () => {})
+  const controller = createSessionTestController(ctx, {
+    defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', nativeOpen: true,
+    fileApplications, openFileApplication,
+  })
+  const signal = new AbortController().signal
+  expect(await controller.workspacePathApplications({ path: '/file.mp3' }, signal)).toEqual(applications)
+  await controller.openWorkspacePath({ path: '/file.mp3', application: applications[0]!.id }, signal)
+  expect(openFileApplication).toHaveBeenCalledWith(expect.stringContaining('file.mp3'), applications[0]!.id, signal)
+  const mapping = vi.spyOn(ctx.fs, 'processPathFromHostPath').mockReturnValue(undefined)
+  onTestFinished(() => { mapping.mockRestore() })
+  await expect(controller.workspacePathApplications({ path: '/remote.mp3' }, signal)).rejects.toThrow('verified Host path')
+  await expect(controller.openWorkspacePath({ path: '/remote.mp3', application: applications[0]!.id }, signal)).rejects.toThrow('verified Host path')
+  expect(fileApplications).toHaveBeenCalledOnce()
+  expect(openFileApplication).toHaveBeenCalledOnce()
+})
diff --git a/packages/api/session-controller/tests/test-remote.ts b/packages/api/session-controller/tests/test-remote.ts
index b4d3db8198..152cffe9b2 100644
--- a/packages/api/session-controller/tests/test-remote.ts
+++ b/packages/api/session-controller/tests/test-remote.ts
@@ -1,3 +1,4 @@
+import type { SessionControllerInternals } from '../src/index.ts'
 /** Test-only direct Remote face over the Session Controller's internal controllers. */
 
 import { SessionLogOffset } from '@deepseek-ai/dsh-session'
@@ -94,6 +95,8 @@ export interface TestSessionRemoteDefaults {
   readonly nativeOpen?: boolean
   readonly saveDefaultModelSelection?: (selection: AgentModelSelection) => void | Promise<void>
   readonly openPath?: (path: string, signal: AbortSignal) => Promise<void>
+  readonly fileApplications?: SessionControllerInternals['fileApplications']
+  readonly openFileApplication?: SessionControllerInternals['openFileApplication']
   readonly revealPath?: (path: string, signal: AbortSignal) => Promise<void>
   readonly canOpenPath?: () => boolean
 }
@@ -288,6 +291,8 @@ function installControllers(
       },
       {
         ...defaults.openPath === undefined ? {} : { openPath: defaults.openPath },
+        ...defaults.fileApplications === undefined ? {} : { fileApplications: defaults.fileApplications },
+        ...defaults.openFileApplication === undefined ? {} : { openFileApplication: defaults.openFileApplication },
         ...defaults.revealPath === undefined ? {} : { revealPath: defaults.revealPath },
         ...defaults.canOpenPath === undefined ? {} : { canOpenPath: defaults.canOpenPath },
       },
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index b2a14bca11..6f34ced839 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -141,3 +141,22 @@ it('dismisses a failure on schedule even when its owner rerenders', async () =>
   act(() => { vi.advanceTimersByTime(1) })
   expect(screen.queryByRole('alert')).toBeNull()
 })
+
+
+it('shows the default icon and current application list, and selects an application without replacing default opening', async () => {
+  const b = bench()
+  const icon = 'data:image/png;base64,aGVsbG8='
+  const applications = vi.fn(async () => [
+    { id: '/Music.app', name: 'Music', default: true, icon },
+    { id: '/Player.app', name: 'Player', default: false, icon: null },
+  ])
+  const view = render(<OpenPathAction {...b.props} applications={applications} />)
+  await act(async () => {})
+  expect(view.container.querySelector('[data-open-path-open] img')?.getAttribute('src')).toBe(icon)
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  expect(screen.getByRole('menuitem', { name: 'Music（默认）' })).toBeTruthy()
+  await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Player' })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', '/Player.app')
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
+})
diff --git a/packages/util/native-command/package.json b/packages/util/native-command/package.json
index 8060a32a2a..a4a749b100 100644
--- a/packages/util/native-command/package.json
+++ b/packages/util/native-command/package.json
@@ -19,7 +19,10 @@
       "default": "./lib/index.js"
     },
     "./src/*": "./src/*",
-    "./package.json": "./package.json"
+    "./package.json": "./package.json",
+    "./types": {
+      "types": "./lib/types/types.d.ts"
+    }
   },
   "files": [
     "lib/index.js",
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index 7777a7f6fc..f865d93145 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -2,15 +2,9 @@
 import { runNativeCommand } from './runner.ts'
 import type { PathOpenerInternals } from './path-opener.ts'
 
-/** One OS-registered application capable of opening the requested file. */
-export interface NativeFileApplication {
-  /** OS application identifier; callers must revalidate it against the file's current handlers before opening. */
-  readonly id: string
-  readonly name: string
-  readonly default: boolean
-  /** PNG data URL, or null when the desktop supplies no icon. */
-  readonly icon: string | null
-}
+import type { NativeFileApplication } from './types.ts'
+
+export type { NativeFileApplication } from './types.ts'
 
 /** AppKit runs inside the system JXA host; paths arrive as argv, never executable source. */
 const MAC_APPLICATIONS = `
diff --git a/packages/util/native-command/src/types.ts b/packages/util/native-command/src/types.ts
new file mode 100644
index 0000000000..4b67d05159
--- /dev/null
+++ b/packages/util/native-command/src/types.ts
@@ -0,0 +1,11 @@
+/** Browser-safe metadata for native file associations. */
+
+/** One OS-registered application capable of opening the requested file. */
+export interface NativeFileApplication {
+  /** OS application identifier; callers must revalidate it against the file's current handlers before opening. */
+  readonly id: string
+  readonly name: string
+  readonly default: boolean
+  /** PNG data URL, or null when the desktop supplies no icon. */
+  readonly icon: string | null
+}

From 03d44191b391c00e84bf82527cbf09f507232824 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:35:56 +0800
Subject: [PATCH 04/62] fix: expose browser-safe file association metadata to
 Remote generation

---
 packages/util/native-command/package.json | 6 ++++--
 tsconfig.base.json                        | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/util/native-command/package.json b/packages/util/native-command/package.json
index a4a749b100..391b6c023d 100644
--- a/packages/util/native-command/package.json
+++ b/packages/util/native-command/package.json
@@ -21,12 +21,14 @@
     "./src/*": "./src/*",
     "./package.json": "./package.json",
     "./types": {
-      "types": "./lib/types/types.d.ts"
+      "types": "./lib/types/types.d.ts",
+      "default": "./lib/types/types.js"
     }
   },
   "files": [
     "lib/index.js",
-    "lib/types/**/*.d.ts"
+    "lib/types/**/*.d.ts",
+    "lib/types/types.js"
   ],
   "license": "MIT",
   "peerDependencies": {
diff --git a/tsconfig.base.json b/tsconfig.base.json
index cc1b65cc78..3f58c32145 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -366,6 +366,7 @@
       "@deepseek-ai/dsh-mcp-client": ["./packages/mcp/mcp-client/src"],
       "@deepseek-ai/dsh-mcp-resources": ["./packages/mcp/mcp-resources/src"],
       "@deepseek-ai/dsh-message-feedback": ["./packages/feedback/message-feedback/src"],
+      "@deepseek-ai/dsh-native-command/types": ["./packages/util/native-command/src/types.ts"],
       "@deepseek-ai/dsh-native-command": ["./packages/util/native-command/src"],
       "@deepseek-ai/dsh-office-to-pdf": ["./packages/document/office-to-pdf/src"],
       "@deepseek-ai/dsh-output-retention": ["./packages/util/output-retention/src"],

From 083901120492c835692780824a0bdac500e582bf Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:37:11 +0800
Subject: [PATCH 05/62] fix: include native association types in client
 compilation

---
 .../session-controller/tsconfig.client.json   | 75 ++++++++++++++-----
 .../tests/open-path-action.client.spec.tsx    | 26 +++++++
 packages/util/native-command/src/types.d.ts   | 11 +++
 .../util/native-command/src/types.d.ts.map    |  1 +
 packages/util/native-command/src/types.js     |  3 +
 packages/util/native-command/src/types.js.map |  1 +
 6 files changed, 99 insertions(+), 18 deletions(-)
 create mode 100644 packages/util/native-command/src/types.d.ts
 create mode 100644 packages/util/native-command/src/types.d.ts.map
 create mode 100644 packages/util/native-command/src/types.js
 create mode 100644 packages/util/native-command/src/types.js.map

diff --git a/packages/api/session-controller/tsconfig.client.json b/packages/api/session-controller/tsconfig.client.json
index 3bb07893e2..b8a0d78fc2 100644
--- a/packages/api/session-controller/tsconfig.client.json
+++ b/packages/api/session-controller/tsconfig.client.json
@@ -11,23 +11,62 @@
     "src/remote-events.ts"
   ],
   "references": [
-    { "path": "../../../vendor/cordis" },
-    { "path": "../gateway/tsconfig.client.json" },
-    { "path": "../../attachment/attachment" },
-    { "path": "../../client/connection/tsconfig.client.json" },
-    { "path": "../../client/file-upload/tsconfig.client.json" },
-    { "path": "../../client/store" },
-    { "path": "../../context/file-reference" },
-    { "path": "../../core/session" },
-    { "path": "../../jobs/jobs" },
-    { "path": "../../llm/llm" },
-    { "path": "../../session/session-projection" },
-    { "path": "../../session/session-title" },
-    { "path": "../../subagent/subagent" },
-    { "path": "../../util/brand" },
-    { "path": "../../util/crypto" },
-    { "path": "../../util/workspace-path" },
-    { "path": "../../workspace/workspace" },
-    { "path": "../../typert/protocol" }
+    {
+      "path": "../../../vendor/cordis"
+    },
+    {
+      "path": "../gateway/tsconfig.client.json"
+    },
+    {
+      "path": "../../attachment/attachment"
+    },
+    {
+      "path": "../../client/connection/tsconfig.client.json"
+    },
+    {
+      "path": "../../client/file-upload/tsconfig.client.json"
+    },
+    {
+      "path": "../../client/store"
+    },
+    {
+      "path": "../../context/file-reference"
+    },
+    {
+      "path": "../../core/session"
+    },
+    {
+      "path": "../../jobs/jobs"
+    },
+    {
+      "path": "../../llm/llm"
+    },
+    {
+      "path": "../../session/session-projection"
+    },
+    {
+      "path": "../../session/session-title"
+    },
+    {
+      "path": "../../subagent/subagent"
+    },
+    {
+      "path": "../../util/brand"
+    },
+    {
+      "path": "../../util/crypto"
+    },
+    {
+      "path": "../../util/workspace-path"
+    },
+    {
+      "path": "../../workspace/workspace"
+    },
+    {
+      "path": "../../typert/protocol"
+    },
+    {
+      "path": "../../util/native-command"
+    }
   ]
 }
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 6f34ced839..f72a9d9780 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -160,3 +160,29 @@ it('shows the default icon and current application list, and selects an applicat
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
 })
+
+
+it('ignores an obsolete file query and refreshes the default application when the menu opens', async () => {
+  const b = bench()
+  const old = Promise.withResolvers<readonly { id: string; name: string; default: boolean; icon: null }[]>()
+  const applications = vi.fn<OpenPathActionProps['applications']>()
+    .mockImplementationOnce(() => old.promise)
+    .mockResolvedValue([{ id: '/Player.app', name: 'Player', default: true, icon: null }])
+  const view = render(<OpenPathAction {...b.props} applications={applications} />)
+  view.rerender(<OpenPathAction {...b.props} absolutePath="/other.mp3" applications={applications} />)
+  await act(async () => { old.resolve([{ id: '/Old.app', name: 'Old', default: true, icon: null }]) })
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  expect(screen.queryByRole('menuitem', { name: 'Old（默认）' })).toBeNull()
+  expect(screen.getByRole('menuitem', { name: 'Player（默认）' })).toBeTruthy()
+  expect(applications.mock.calls[0]![1].aborted).toBe(true)
+  expect(applications).toHaveBeenLastCalledWith('/other.mp3', expect.any(AbortSignal))
+})
+
+it('keeps default opening available when application discovery fails', async () => {
+  const b = bench()
+  render(<OpenPathAction {...b.props} applications={async () => null} />)
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  expect(screen.getByRole('menuitem', { name: zh['path.appsError'] }).getAttribute('aria-disabled')).toBe('true')
+  await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
+})
diff --git a/packages/util/native-command/src/types.d.ts b/packages/util/native-command/src/types.d.ts
new file mode 100644
index 0000000000..9206e9b400
--- /dev/null
+++ b/packages/util/native-command/src/types.d.ts
@@ -0,0 +1,11 @@
+/** Browser-safe metadata for native file associations. */
+/** One OS-registered application capable of opening the requested file. */
+export interface NativeFileApplication {
+  /** OS application identifier; callers must revalidate it against the file's current handlers before opening. */
+  readonly id: string
+  readonly name: string
+  readonly default: boolean
+  /** PNG data URL, or null when the desktop supplies no icon. */
+  readonly icon: string | null
+}
+//# sourceMappingURL=types.d.ts.map
diff --git a/packages/util/native-command/src/types.d.ts.map b/packages/util/native-command/src/types.d.ts.map
new file mode 100644
index 0000000000..378f0bc5ab
--- /dev/null
+++ b/packages/util/native-command/src/types.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"types.d.ts","sourceRoot":"","sources":["types.ts"],"names":[],"mappings":"AAAA,0DAA0D;AAE1D,2EAA2E;AAC3E,MAAM,WAAW,qBAAqB;IACpC,gHAAgH;IAChH,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAA;IACnB,QAAQ,CAAC,IAAI,EAAE,MAAM,CAAA;IACrB,QAAQ,CAAC,OAAO,EAAE,OAAO,CAAA;IACzB,+DAA+D;IAC/D,QAAQ,CAAC,IAAI,EAAE,MAAM,GAAG,IAAI,CAAA;CAC7B"}
\ No newline at end of file
diff --git a/packages/util/native-command/src/types.js b/packages/util/native-command/src/types.js
new file mode 100644
index 0000000000..77e2c20121
--- /dev/null
+++ b/packages/util/native-command/src/types.js
@@ -0,0 +1,3 @@
+/** Browser-safe metadata for native file associations. */
+export {};
+//# sourceMappingURL=types.js.map
\ No newline at end of file
diff --git a/packages/util/native-command/src/types.js.map b/packages/util/native-command/src/types.js.map
new file mode 100644
index 0000000000..c8c16fbd5f
--- /dev/null
+++ b/packages/util/native-command/src/types.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"types.js","sourceRoot":"","sources":["types.ts"],"names":[],"mappings":"AAAA,0DAA0D"}
\ No newline at end of file

From 0ae1b2f91cb1f070179c9d056559f1d9c2d2ef0f Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:39:42 +0800
Subject: [PATCH 06/62] docs: describe native file application selection and
 platform scope

---
 docs/subsystems/session.i18n.yaml                |  4 ++--
 docs/subsystems/session.md                       | 10 ++++++++++
 docs/subsystems/session.zh.md                    | 10 ++++++++++
 packages/api/session-controller/README.i18n.yaml |  4 ++--
 packages/api/session-controller/README.md        |  2 ++
 packages/api/session-controller/README.zh.md     |  2 ++
 packages/client/ui-open-in-app/README.i18n.yaml  |  4 ++--
 packages/client/ui-open-in-app/README.md         |  2 ++
 packages/client/ui-open-in-app/README.zh.md      |  2 ++
 .../extensions/tool-cordis/src/api-catalog.ts    | 16 +++++++++++++++-
 packages/util/native-command/README.i18n.yaml    |  4 ++--
 packages/util/native-command/README.md           |  2 ++
 packages/util/native-command/README.zh.md        |  2 ++
 packages/util/native-command/src/types.d.ts      | 11 -----------
 packages/util/native-command/src/types.d.ts.map  |  1 -
 packages/util/native-command/src/types.js        |  3 ---
 packages/util/native-command/src/types.js.map    |  1 -
 scripts/gen-cordis-catalog.ts                    |  1 +
 18 files changed, 56 insertions(+), 25 deletions(-)
 delete mode 100644 packages/util/native-command/src/types.d.ts
 delete mode 100644 packages/util/native-command/src/types.d.ts.map
 delete mode 100644 packages/util/native-command/src/types.js
 delete mode 100644 packages/util/native-command/src/types.js.map

diff --git a/docs/subsystems/session.i18n.yaml b/docs/subsystems/session.i18n.yaml
index 83eecfd1c7..15e84bb5d7 100644
--- a/docs/subsystems/session.i18n.yaml
+++ b/docs/subsystems/session.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/subsystems/session.md
-session.md: 62f7785d4d1db9c30706a8b967e6f4073b810149
-session.zh.md: 7cd3c38162df209d245d3f1085ab1edce002531a
+session.md: 5c8d27167fb95e4ab2da952ea6edb47aa6afd99b
+session.zh.md: b9e7299689d535f56b48e53fd4b2dff152b3b78f
diff --git a/docs/subsystems/session.md b/docs/subsystems/session.md
index 62f7785d4d..5c8d27167f 100644
--- a/docs/subsystems/session.md
+++ b/docs/subsystems/session.md
@@ -758,6 +758,8 @@ The backends that consume this contract are on [persistence.md](persistence.md).
 
 `SessionOpenWorkspacePathRequest` carries an absolute or workspace-resolved `path`; optional `action: "reveal"` selects file-manager navigation instead of default-application opening. `SessionOpenWorkspacePathValue` confirms that the Host accepted the native handoff. A Session-aware Client resolves relative paths against its current Session cwd when known; the controller hands the path to the opener unchanged and reports invalid requests, cancellation, and opener failures through the Session Remote error vocabulary.
 
+The optional `application` selects a registered file handler without changing the system default; `workspacePathApplications({ path })` returns current handlers, names, icons, and default selection after Host path verification.
+
 <!-- BEGIN GENERATED cordis-surface (gen-cordis-catalog.ts) — do not edit between markers -->
 
 <a id="cordis-surface"></a>
@@ -845,6 +847,14 @@ workspaceDesktop(): { name: string; available: boolean; fileManager: 'finder' |
  */
 @Remote('openWorkspacePath') async openWorkspacePath( request: SessionOpenWorkspacePathRequest, signal: AbortSignal, ): Promise<SessionOpenWorkspacePathValue>
 
+/**
+ * Query current file handlers on the serving desktop without activating an Agent.
+ * @param request - file path in Host filesystem syntax.
+ * @param signal - caller lifetime, propagated to filesystem and desktop queries.
+ * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+ */
+@Remote('workspacePathApplications') async workspacePathApplications( request: { readonly path: string }, signal: AbortSignal, ): Promise<readonly SessionWorkspacePathApplication[]>
+
 /**
  * Rename one Session after explicitly resuming it.
  * @param request - Session identity and proposed title.
diff --git a/docs/subsystems/session.zh.md b/docs/subsystems/session.zh.md
index 7cd3c38162..b9e7299689 100644
--- a/docs/subsystems/session.zh.md
+++ b/docs/subsystems/session.zh.md
@@ -762,6 +762,8 @@ interface TurnEndReasonMap {
 
 `SessionOpenWorkspacePathRequest` 携带绝对路径或已按 workspace 解析的 `path`。`SessionOpenWorkspacePathValue` 确认 Host 已接受原生交接。Session-aware Client 会在已知当前 Session cwd 时据此解析相对路径；controller 将路径原样交给打开器，并通过 Session Remote 错误词汇表报告无效请求、取消与打开器失败。 可选的 `action: "reveal"` 选择文件管理器导航；省略时使用默认应用打开。
 
+可选的 `application` 指定文件关联应用，不修改系统默认值；`workspacePathApplications({ path })` 在校验 Host 路径后返回当前关联应用、名称、图标和默认项。
+
 <!-- BEGIN GENERATED cordis-surface (gen-cordis-catalog.ts) — do not edit between markers -->
 
 <a id="cordis-surface"></a>
@@ -849,6 +851,14 @@ workspaceDesktop(): { name: string; available: boolean; fileManager: 'finder' |
  */
 @Remote('openWorkspacePath') async openWorkspacePath( request: SessionOpenWorkspacePathRequest, signal: AbortSignal, ): Promise<SessionOpenWorkspacePathValue>
 
+/**
+ * Query current file handlers on the serving desktop without activating an Agent.
+ * @param request - file path in Host filesystem syntax.
+ * @param signal - caller lifetime, propagated to filesystem and desktop queries.
+ * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+ */
+@Remote('workspacePathApplications') async workspacePathApplications( request: { readonly path: string }, signal: AbortSignal, ): Promise<readonly SessionWorkspacePathApplication[]>
+
 /**
  * Rename one Session after explicitly resuming it.
  * @param request - Session identity and proposed title.
diff --git a/packages/api/session-controller/README.i18n.yaml b/packages/api/session-controller/README.i18n.yaml
index d04576c269..3ed051d32d 100644
--- a/packages/api/session-controller/README.i18n.yaml
+++ b/packages/api/session-controller/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/api/session-controller/README.md
-README.md: a0e18910d14f879171a1415476a7e05a0d261a8a
-README.zh.md: 58466e387fd604137a2358e8b9a7de3320691034
+README.md: 8e879e5d26f9aa3f920789499af80e12c6beaa44
+README.zh.md: ac6e775e0f7a0a29057cd37c310fd6d00cd38a5f
diff --git a/packages/api/session-controller/README.md b/packages/api/session-controller/README.md
index a0e18910d1..8e879e5d26 100644
--- a/packages/api/session-controller/README.md
+++ b/packages/api/session-controller/README.md
@@ -68,6 +68,8 @@ References keep local Session data, scoped Contexts, and history streams alive,
 
 `SessionMediaReferences` mounts `GET|HEAD /api/file?path=<absolute path>` on the authenticated `connection.fetch` channel when `connection`, `fs`, and `attachments` are composed. It reads ordinary files through `ctx.fs`, including temporary paths outside registered workspaces and files in remote providers. Neither directory containment nor MIME categories restrict access; `mime-types` supplies the response type, with `application/octet-stream` for unknown extensions. GET reuses `readBytes` for preflight and ongoing byte limits; HEAD reads metadata only. All files use `ctx.attachments.imageLimits.maxImageBytes` (normally 20 MiB); exceeding this limit returns 413. Responses contain the complete file, ignore Range, and carry `private, no-store`, `nosniff`, and a sandbox CSP so directly opened HTML/SVG cannot execute with the API origin. The Client rewrite lives in `ui-chat` (`AssistantMarkdown`); audio/video responses are available, while Markdown audio/video player nodes remain separate work.
 
+`workspacePathApplications({ path })` returns the serving desktop’s file handlers after the same filesystem mapping check used by `openWorkspacePath`. An optional `application` in the open request selects a currently registered handler without changing the system default. Application names, default selection, icons, and platform coverage come from [native-command](../../util/native-command/README.md). These operations do not activate an Agent or append Session events.
+
 -----
 
 <a id="configuration"></a>
diff --git a/packages/api/session-controller/README.zh.md b/packages/api/session-controller/README.zh.md
index 58466e387f..ac6e775e0f 100644
--- a/packages/api/session-controller/README.zh.md
+++ b/packages/api/session-controller/README.zh.md
@@ -68,6 +68,8 @@ Fork 复制 `atSeq` 所选的精确事件前缀，包含切点事件，允许在
 
 当 `connection`、`fs` 与 `attachments` 均被组合时，`SessionMediaReferences` 在鉴权 `connection.fetch` 通道上挂载 `GET|HEAD /api/file?path=<绝对路径>`。它通过 `ctx.fs` 读取普通文件，包括已注册工作区之外的临时路径与远程提供方中的文件。目录包含关系与 MIME 类别均不限制访问；`mime-types` 提供响应类型，未知扩展名使用 `application/octet-stream`。GET 复用 `readBytes` 执行读取前及读取中的字节限制；HEAD 只读取元数据。所有文件均使用 `ctx.attachments.imageLimits.maxImageBytes`（通常为 20 MiB）；超过此上限返回 413。响应包含完整文件，忽略 Range，并携带 `private, no-store`、`nosniff` 与沙箱 CSP，使直接打开的 HTML/SVG 无法以 API 源身份执行脚本。客户端重写位于 `ui-chat`（`AssistantMarkdown`）；音视频文件响应已可用，Markdown 音视频播放器节点仍是独立工作。
 
+`workspacePathApplications({ path })` 使用与 `openWorkspacePath` 相同的文件系统映射校验，返回服务端桌面上该文件的关联应用。打开请求中的可选 `application` 指定当前关联的应用，不修改系统默认应用。应用名称、默认项、图标和平台支持范围由 [native-command](../../util/native-command/README.zh.md) 提供。这些操作不激活 Agent，也不追加会话事件。
+
 -----
 
 <a id="configuration"></a>
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index fbf2a75bc6..cc15c6a7eb 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: b70b39e79a172badc2b237083d6cd268e9cce06e
-README.zh.md: 9d47e57cfe388b3823cee648f1fdf3187b534d78
+README.md: a21a0b3bf3cc5dabe79dc2aa907640d66c8b25c5
+README.zh.md: cbbefaa2d619f591167f7b7775b2eb4c2c945ff1
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index b70b39e79a..a21a0b3bf3 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -33,6 +33,8 @@ The main button shows the remembered application's icon — the real application
 
 In the document preview, the header's "Open ▾" split button opens the previewed file in the Host's default application from its main button, and its menu offers that action and "Show file location" (the file manager's reveal). A file the preview cannot render, whether an unsupported suffix such as video or an archive or a file the reader rejected as non-text or oversized, shows an "Open in default app" button in its empty state where Retry would otherwise stand. Both controls hand the Host the absolute path the file's metadata reports, appear only after the Host answered that a desktop is available, disable only while their own gesture settles, and announce a failed gesture once through a transient toast ("Could not open. Try again." or "Could not show the file location. Try again."); nothing stays on the control afterwards.
 
+The document header shows the default application’s icon when available. Its menu lists the file’s OS-registered applications and marks the default. Choosing an application opens this file once; the main button continues to use the system default. Associations refresh when the file or menu visibility changes; cancelled queries cannot replace another file’s results. A failed query displays a menu message while default opening and reveal remain available. Platform coverage follows [native-command](../../util/native-command/README.md).
+
 -----
 
 <a id="understand-the-implementation"></a>
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 9d47e57cfe..cbbefaa2d6 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -33,6 +33,8 @@ kind: "package-reference"
 
 在文档预览里，头部的「打开 ▾」分体按钮的主按钮用 Host 默认应用打开当前文件，菜单提供同一动作和「显示文件位置」（文件管理器的定位）。预览无法渲染的文件，无论是视频、压缩包这类不支持的后缀，还是被读取器判为非文本或过大的文件，都会在空态里原本放重试的位置显示「用默认应用打开」按钮。两个控件都把文件元数据报出的绝对路径交给 Host，只在 Host 回答有桌面之后出现，只在自己的手势结算期间禁用，失败时通过短暂 toast 提示一次（「打开失败，请重试」或「无法显示文件位置，请重试」），之后控件上不残留任何状态。
 
+文档标题栏在可用时显示默认应用图标。菜单列出系统为该文件注册的应用，并标记默认项。选择应用只用于本次打开，主按钮始终使用系统默认应用。文件或菜单显示状态变化时会重新查询关联应用；已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，默认打开和定位仍可使用。平台支持范围见 [native-command](../../util/native-command/README.zh.md)。
+
 -----
 
 <a id="understand-the-implementation"></a>
diff --git a/packages/extensions/tool-cordis/src/api-catalog.ts b/packages/extensions/tool-cordis/src/api-catalog.ts
index 78975d4a43..1dbd2216b2 100644
--- a/packages/extensions/tool-cordis/src/api-catalog.ts
+++ b/packages/extensions/tool-cordis/src/api-catalog.ts
@@ -1744,6 +1744,12 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         returns: 'confirmation after the native opener accepts the path.',
         throws: ['RemoteError when the request is invalid, has no verified Host mapping, is cancelled, or the opener fails.'],
       },
+      {
+        signature: '@Remote(\'workspacePathApplications\') async workspacePathApplications( request: { readonly path: string }, signal: AbortSignal, ): Promise<readonly SessionWorkspacePathApplication[]>',
+        description: 'Query current file handlers on the serving desktop without activating an Agent.',
+        parameters: [{ name: 'request', description: 'file path in Host filesystem syntax.' }, { name: 'signal', description: 'caller lifetime, propagated to filesystem and desktop queries.' }],
+        returns: 'OS application names, icons, and default selection; empty when desktop opening is unavailable.',
+      },
       {
         signature: '@Remote(\'rename\') rename(request: SessionRenameRequest): Promise<SessionRenameValue>',
         description: 'Rename one Session after explicitly resuming it.',
@@ -5271,6 +5277,10 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'ModelReasoningEffort',
     declaration: 'export interface ModelReasoningEffort {\n    readonly id: string;\n    readonly name: string;\n    readonly description?: string;\n}',
   },
+  {
+    name: 'NativeFileApplication',
+    declaration: 'export interface NativeFileApplication {\n    readonly id: string;\n    readonly name: string;\n    readonly default: boolean;\n    readonly icon: string | null;\n}',
+  },
   {
     name: 'ObjectJsonSchema',
     declaration: 'export type ObjectJsonSchema = JsonSchemaNode & {\n    type: \'object\';\n};',
@@ -5981,7 +5991,7 @@ export const TYPE_API: readonly TypeApiEntry[] = [
   },
   {
     name: 'SessionOpenWorkspacePathRequest',
-    declaration: 'export interface SessionOpenWorkspacePathRequest {\n    readonly action?: \'reveal\';\n    readonly path: string;\n}',
+    declaration: 'export interface SessionOpenWorkspacePathRequest {\n    readonly action?: \'reveal\';\n    readonly application?: string;\n    readonly path: string;\n}',
   },
   {
     name: 'SessionOpenWorkspacePathValue',
@@ -6235,6 +6245,10 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'SessionWireHeader',
     declaration: 'export interface SessionWireHeader {\n    readonly version: number;\n    readonly id: SessionId;\n    readonly createdAt: number;\n    readonly cwd?: string;\n    readonly parentSession?: SessionId;\n    readonly isSeeded: boolean;\n    readonly origin?: \'subagent\';\n    readonly delegationDepth?: number;\n    readonly agentPreset?: string;\n}',
   },
+  {
+    name: 'SessionWorkspacePathApplication',
+    declaration: 'export type SessionWorkspacePathApplication = NativeFileApplication;',
+  },
   {
     name: 'SettingsApplies',
     declaration: 'export type SettingsApplies = \'live\' | \'restart\';',
diff --git a/packages/util/native-command/README.i18n.yaml b/packages/util/native-command/README.i18n.yaml
index 8bc90e6e8d..d9fba84086 100644
--- a/packages/util/native-command/README.i18n.yaml
+++ b/packages/util/native-command/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/util/native-command/README.md
-README.md: 9abf4031a915121b6fd2a218473b27c864f8ced8
-README.zh.md: 083318cf4bb37e1c18f016512d58df8bb8f3aec5
+README.md: 8d193855bfb5295b17378312da7d85017867501f
+README.zh.md: 4a2fed91fa8ba0c6ae03ad6f91f296352f93fe87
diff --git a/packages/util/native-command/README.md b/packages/util/native-command/README.md
index 9abf4031a9..8d193855bf 100644
--- a/packages/util/native-command/README.md
+++ b/packages/util/native-command/README.md
@@ -49,6 +49,8 @@ The `NativeCommandRunner` type is the injectable command boundary for host integ
 
 `revealNativePath(path, signal)` selects the file in Finder or Explorer, including WSL path translation, and opens its parent directory through `xdg-open` on desktop Linux. `nativeFileManager()` identifies that action for Host-derived UI labels; desktop availability remains a separate `canOpenNativePath()` check. Callers must authorize the absolute file path before invoking either operation. Platform dispatch is covered by injected-runner tests; native desktop verification belongs to the corresponding platform. Explorer receives an encoded file URI as a separate argument. Its exit code 1 is accepted as a delegated handoff; cancellation, missing executables, and other exit codes still reject. This acknowledgement does not prove that a desktop window selected the file.
 
+`nativeFileApplications(path, signal)` queries macOS LaunchServices for the file’s registered handlers, current default, localized names, and PNG application icons. `openNativeFileApplication(path, application, signal)` rechecks membership before launching the selected handler. Callers authorize the local file path. Windows and Linux currently return no handlers; default opening and reveal remain available through the path openers.
+
 -----
 
 <a id="understand-the-implementation"></a>
diff --git a/packages/util/native-command/README.zh.md b/packages/util/native-command/README.zh.md
index 083318cf4b..4a2fed91fa 100644
--- a/packages/util/native-command/README.zh.md
+++ b/packages/util/native-command/README.zh.md
@@ -49,6 +49,8 @@ const { stdout, stderr } = await runNativeCommand('osascript', ['-e', script], s
 
 `revealNativePath(path, signal)` 在 Finder 或文件资源管理器中选中文件，包含 WSL 路径转换；在桌面 Linux 上通过 `xdg-open` 打开上层目录。`nativeFileManager()` 标识该操作，供 UI 根据 Host 选择文案；桌面是否可用仍由独立的 `canOpenNativePath()` 检查决定。调用方必须先授权绝对文件路径，再执行操作。平台分派由注入运行器的测试覆盖；原生桌面验证由对应平台负责。 Explorer 接收独立参数中的编码文件 URI。退出码 1 按已转交请求处理；取消、找不到可执行文件和其他退出码仍然报错。该确认不能证明桌面窗口已选中文件。
 
+`nativeFileApplications(path, signal)` 从 macOS LaunchServices 查询文件的关联应用、当前默认应用、本地化名称和 PNG 应用图标。`openNativeFileApplication(path, application, signal)` 在启动指定应用前重新核对关联列表。调用方负责验证本地文件路径。Windows 和 Linux 当前返回空列表；默认打开和文件定位仍由路径打开接口提供。
+
 -----
 
 <a id="understand-the-implementation"></a>
diff --git a/packages/util/native-command/src/types.d.ts b/packages/util/native-command/src/types.d.ts
deleted file mode 100644
index 9206e9b400..0000000000
--- a/packages/util/native-command/src/types.d.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-/** Browser-safe metadata for native file associations. */
-/** One OS-registered application capable of opening the requested file. */
-export interface NativeFileApplication {
-  /** OS application identifier; callers must revalidate it against the file's current handlers before opening. */
-  readonly id: string
-  readonly name: string
-  readonly default: boolean
-  /** PNG data URL, or null when the desktop supplies no icon. */
-  readonly icon: string | null
-}
-//# sourceMappingURL=types.d.ts.map
diff --git a/packages/util/native-command/src/types.d.ts.map b/packages/util/native-command/src/types.d.ts.map
deleted file mode 100644
index 378f0bc5ab..0000000000
--- a/packages/util/native-command/src/types.d.ts.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"types.d.ts","sourceRoot":"","sources":["types.ts"],"names":[],"mappings":"AAAA,0DAA0D;AAE1D,2EAA2E;AAC3E,MAAM,WAAW,qBAAqB;IACpC,gHAAgH;IAChH,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAA;IACnB,QAAQ,CAAC,IAAI,EAAE,MAAM,CAAA;IACrB,QAAQ,CAAC,OAAO,EAAE,OAAO,CAAA;IACzB,+DAA+D;IAC/D,QAAQ,CAAC,IAAI,EAAE,MAAM,GAAG,IAAI,CAAA;CAC7B"}
\ No newline at end of file
diff --git a/packages/util/native-command/src/types.js b/packages/util/native-command/src/types.js
deleted file mode 100644
index 77e2c20121..0000000000
--- a/packages/util/native-command/src/types.js
+++ /dev/null
@@ -1,3 +0,0 @@
-/** Browser-safe metadata for native file associations. */
-export {};
-//# sourceMappingURL=types.js.map
\ No newline at end of file
diff --git a/packages/util/native-command/src/types.js.map b/packages/util/native-command/src/types.js.map
deleted file mode 100644
index c8c16fbd5f..0000000000
--- a/packages/util/native-command/src/types.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"types.js","sourceRoot":"","sources":["types.ts"],"names":[],"mappings":"AAAA,0DAA0D"}
\ No newline at end of file
diff --git a/scripts/gen-cordis-catalog.ts b/scripts/gen-cordis-catalog.ts
index c3a8c6a239..dd5f0f3d31 100644
--- a/scripts/gen-cordis-catalog.ts
+++ b/scripts/gen-cordis-catalog.ts
@@ -379,6 +379,7 @@ export const LINK_MAP: Readonly<Record<string, string>> = {
   ModelCatalog: 'session.md',
   SessionOpenWorkspacePathRequest: 'session.md',
   SessionOpenWorkspacePathValue: 'session.md',
+  SessionWorkspacePathApplication: 'session.md',
   SessionModels: 'session.md',
   SessionModelsRequest: 'session.md',
   SessionPage: 'session.md',

From e435340eff439ec1be0f3fdc2a8a8658cabff793 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:41:48 +0800
Subject: [PATCH 07/62] test: exercise application selection through the
 recorded Web session

---
 apps/web/tests/document-preview.e2e.ts        | 25 ++++++++++++++++---
 .../tests/open-path-action.client.spec.tsx    |  2 +-
 .../native-command/src/file-applications.ts   |  4 +--
 .../tests/file-applications.spec.ts           |  4 +--
 .../document-preview/applications.expected.md |  5 ++++
 5 files changed, 32 insertions(+), 8 deletions(-)
 create mode 100644 snapshots/web/document-preview/applications.expected.md

diff --git a/apps/web/tests/document-preview.e2e.ts b/apps/web/tests/document-preview.e2e.ts
index 31b2fd06b6..922ea15992 100644
--- a/apps/web/tests/document-preview.e2e.ts
+++ b/apps/web/tests/document-preview.e2e.ts
@@ -102,10 +102,17 @@ describe.skipIf(MODE === 'record')('web e2e: document preview through Files', ()
       const command = process.platform === 'darwin' ? 'open' : 'xdg-open'
       await writeFile(join(nativeRoot, command), `#!/usr/bin/env node
 const fs = require('node:fs');
-const path = process.argv[2] === '-R' ? process.argv[3] : process.argv[2];
-const action = process.argv[2] === '-R' || fs.statSync(path).isDirectory() ? 'reveal' : 'open';
+const path = process.argv[2] === '-a' ? process.argv[4] : process.argv[2] === '-R' ? process.argv[3] : process.argv[2];
+const action = process.argv[2] === '-a' ? 'application' : process.argv[2] === '-R' || fs.statSync(path).isDirectory() ? 'reveal' : 'open';
 fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) + '\\n');
 `, { mode: 0o700 })
+      if (process.platform === 'darwin') {
+        const apps = [
+          { id: '/Applications/Test Player.app', name: 'Test Player', default: true, icon: `data:image/png;base64,${TINY_PNG.toString('base64')}` },
+          { id: '/Applications/Other Player.app', name: 'Other Player', default: false, icon: null },
+        ]
+        await writeFile(join(nativeRoot, 'osascript'), `#!/usr/bin/env node\nprocess.stdout.write(${JSON.stringify(JSON.stringify(apps))});\n`, { mode: 0o700 })
+      }
       vi.stubEnv('PATH', `${nativeRoot}${delimiter}${process.env.PATH ?? ''}`)
     }
     // The Open In rows carry the default-application controls; the SSH marker
@@ -756,13 +763,25 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
       expect(gestures[0]).toEqual({ path: clip, action: 'open' })
       expect(gestures[1]?.action).toBe('reveal')
       expect([clip, cwd]).toContain(gestures[1]?.path)
+      if (process.platform === 'darwin') {
+        await expect.poll(() => headerOpen.locator('img').count()).toBe(1)
+        await unsupported.locator('[data-open-path-more]').click()
+        await page.getByRole('menuitem', { name: 'Test Player (default)', exact: true }).waitFor()
+        await compareOrRefreshGolden(join(SNAPSHOT_DIR, 'applications.expected.md'), await page.getByRole('menu').ariaSnapshot(), MODE)
+        await page.getByRole('menuitem', { name: 'Other Player', exact: true }).click()
+        await expect.poll(async () => (await opened()).length).toBe(3)
+        expect((await opened())[2]).toEqual({ path: clip, action: 'application' })
+        await headerOpen.click()
+        await expect.poll(async () => (await opened()).length).toBe(4)
+        expect((await opened())[3]).toEqual({ path: clip, action: 'open' })
+      }
       // Gesture facts stay out of the golden: the stub does not run on Windows.
       expect(await page.getByRole('alert').count()).toBe(0)
     }
     expect(tripwire.pageErrors).toEqual([])
     expect(tripwire.warnings).toEqual([])
     await compareOrRefreshGolden(EXPECTED, sections.join('\n\n'), MODE)
-    await assertFixtureInventory(SNAPSHOT_DIR, ['document.expected.md', 'paging.patch.yml'])
+    await assertFixtureInventory(SNAPSHOT_DIR, ['document.expected.md', 'applications.expected.md', 'paging.patch.yml'])
   })
 })
 
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index f72a9d9780..45dfe9272b 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -182,7 +182,7 @@ it('keeps default opening available when application discovery fails', async ()
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => null} />)
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
-  expect(screen.getByRole('menuitem', { name: zh['path.appsError'] }).getAttribute('aria-disabled')).toBe('true')
+  expect(screen.getByRole('menuitem', { name: zh['path.appsError'] }).hasAttribute('disabled')).toBe(true)
   await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
 })
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index f865d93145..dd6d3d7cad 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -50,7 +50,7 @@ export async function nativeFileApplications(
   const platform = internals.platform ?? process.platform
   if (platform !== 'darwin') return []
   const run = internals.run ?? runNativeCommand
-  const { stdout } = await run('/usr/bin/osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, path], signal)
+  const { stdout } = await run('osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, path], signal)
   const value: unknown = JSON.parse(stdout)
   if (!Array.isArray(value)) throw new Error('Invalid native application list')
   const applications: NativeFileApplication[] = []
@@ -80,5 +80,5 @@ export async function openNativeFileApplication(
   const apps = await nativeFileApplications(path, signal, internals)
   if (!apps.some(app => app.id === application)) throw new Error('Application is not registered for this file')
   const run = internals.run ?? runNativeCommand
-  await run('/usr/bin/open', ['-a', application, path], signal)
+  await run('open', ['-a', application, path], signal)
 }
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index b6f2e3328c..fd87806cc6 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -10,7 +10,7 @@ describe('native file associations', () => {
     const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
     const path = '/tmp/中文 $(touch nope).mp3'
     await expect(nativeFileApplications(path, signal, { platform: 'darwin', run })).resolves.toEqual([application])
-    expect(run).toHaveBeenCalledWith('/usr/bin/osascript', ['-l', 'JavaScript', '-e', expect.any(String), path], signal)
+    expect(run).toHaveBeenCalledWith('osascript', ['-l', 'JavaScript', '-e', expect.any(String), path], signal)
   })
 
   it.each(['{}', '[null]', '[{"id":1}]', JSON.stringify([{ ...application, icon: 'javascript:alert(1)' }])])('rejects malformed native output %s', async (stdout) => {
@@ -22,7 +22,7 @@ describe('native file associations', () => {
   it('launches only a currently registered application with argv', async () => {
     const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
     await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin', run })
-    expect(run).toHaveBeenLastCalledWith('/usr/bin/open', ['-a', application.id, '/file.mp3'], signal)
+    expect(run).toHaveBeenLastCalledWith('open', ['-a', application.id, '/file.mp3'], signal)
     run.mockClear()
     await expect(openNativeFileApplication('/file.mp3', '/arbitrary.app', signal, { platform: 'darwin', run })).rejects.toThrow('not registered')
     expect(run).toHaveBeenCalledOnce()
diff --git a/snapshots/web/document-preview/applications.expected.md b/snapshots/web/document-preview/applications.expected.md
new file mode 100644
index 0000000000..9a6667e3e4
--- /dev/null
+++ b/snapshots/web/document-preview/applications.expected.md
@@ -0,0 +1,5 @@
+- menu:
+  - menuitem "Open in default app"
+  - menuitem "Test Player (default)"
+  - menuitem "Other Player"
+  - menuitem "Show file location"

From 5325babc7b5287dba51e0982f94bac05bd03fb9e Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:43:06 +0800
Subject: [PATCH 08/62] test: cover default native command adapter selection

---
 .../native-command/tests/file-applications.spec.ts   | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index fd87806cc6..b8aeed5c26 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -1,5 +1,6 @@
 /** File association results and explicit handler authorization at the native command adapter. */
-import { describe, expect, it, vi } from 'vitest'
+import { describe, expect, it, vi, onTestFinished } from 'vitest'
+import * as runner from '../src/runner.ts'
 import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
 
 const application = { id: '/Applications/Music.app', name: 'Music', default: true, icon: null }
@@ -35,3 +36,12 @@ describe('native file associations', () => {
     expect(run).not.toHaveBeenCalled()
   })
 })
+
+
+it('uses the production command adapter and current platform when no override is supplied', async () => {
+  const run = vi.spyOn(runner, 'runNativeCommand').mockResolvedValue({ stdout: JSON.stringify([application]), stderr: '' })
+  onTestFinished(() => { run.mockRestore() })
+  expect(await nativeFileApplications('/file.mp3', signal)).toEqual(process.platform === 'darwin' ? [application] : [])
+  await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin' })
+  expect(run).toHaveBeenLastCalledWith('open', ['-a', application.id, '/file.mp3'], signal)
+})

From 0c3045d488e2623be21558a523669e96f7ad8e31 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 10:45:21 +0800
Subject: [PATCH 09/62] fix: validate native metadata and refresh generated
 source references

---
 apps/web/tests/document-preview.e2e.ts                |  4 ++--
 docs/config-catalog.i18n.yaml                         |  4 ++--
 docs/config-catalog.md                                |  2 +-
 docs/config-catalog.zh.md                             |  2 +-
 docs/event-producer-consumer.i18n.yaml                |  4 ++--
 docs/event-producer-consumer.md                       | 10 +++++-----
 docs/event-producer-consumer.zh.md                    | 10 +++++-----
 docs/persistence-catalog.i18n.yaml                    |  4 ++--
 docs/persistence-catalog.md                           |  8 ++++----
 docs/persistence-catalog.zh.md                        |  8 ++++----
 docs/persistence-schema.json                          |  6 +++---
 packages/util/native-command/src/file-applications.ts |  4 +++-
 tsconfig.base.json                                    |  2 +-
 13 files changed, 35 insertions(+), 33 deletions(-)

diff --git a/apps/web/tests/document-preview.e2e.ts b/apps/web/tests/document-preview.e2e.ts
index 922ea15992..dd35398713 100644
--- a/apps/web/tests/document-preview.e2e.ts
+++ b/apps/web/tests/document-preview.e2e.ts
@@ -89,8 +89,8 @@ describe.skipIf(MODE === 'record')('web e2e: document preview through Files', ()
   let outsideRoot: string | undefined
   let nativeRoot: string | undefined
   let openLog = ''
-  const opened = async (): Promise<Array<{ path: string; action: 'open' | 'reveal' }>> =>
-    (await readFile(openLog, 'utf8')).split('\n').filter(Boolean).map(line => JSON.parse(line) as { path: string; action: 'open' | 'reveal' })
+  const opened = async (): Promise<Array<{ path: string; action: 'open' | 'reveal' | 'application' }>> =>
+    (await readFile(openLog, 'utf8')).split('\n').filter(Boolean).map(line => JSON.parse(line) as { path: string; action: 'open' | 'reveal' | 'application' })
 
   beforeAll(async () => {
     outsideRoot = await mkdtemp(join(tmpdir(), 'dsh-preview-outside-'))
diff --git a/docs/config-catalog.i18n.yaml b/docs/config-catalog.i18n.yaml
index 106e1545fb..d336b38454 100644
--- a/docs/config-catalog.i18n.yaml
+++ b/docs/config-catalog.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/config-catalog.md
-config-catalog.md: dad6b57ae0712e04ad16729b4067c541f83c68d6
-config-catalog.zh.md: 4ba0378810f3db4797c0d41fa5230f7069438b3f
+config-catalog.md: 24d48dbba4bee38feaaf2b4abd525871ee60de12
+config-catalog.zh.md: c1339795e97d2c2247b06c97d99058ee0e6f864e
diff --git a/docs/config-catalog.md b/docs/config-catalog.md
index dad6b57ae0..24d48dbba4 100644
--- a/docs/config-catalog.md
+++ b/docs/config-catalog.md
@@ -213,7 +213,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/api/session-controller/src/index.ts:77`](../packages/api/session-controller/src/index.ts)
+Source: [`packages/api/session-controller/src/index.ts:78`](../packages/api/session-controller/src/index.ts)
 
 <a id="deepseek-aidsh-api-settings-controller"></a>
 
diff --git a/docs/config-catalog.zh.md b/docs/config-catalog.zh.md
index 4ba0378810..c1339795e9 100644
--- a/docs/config-catalog.zh.md
+++ b/docs/config-catalog.zh.md
@@ -215,7 +215,7 @@ export interface Config {
 }
 ```
 
-来源：[`packages/api/session-controller/src/index.ts:77`](../packages/api/session-controller/src/index.ts)
+来源：[`packages/api/session-controller/src/index.ts:78`](../packages/api/session-controller/src/index.ts)
 
 <a id="deepseek-aidsh-api-settings-controller"></a>
 
diff --git a/docs/event-producer-consumer.i18n.yaml b/docs/event-producer-consumer.i18n.yaml
index f3dd91b507..f0e8b7e68c 100644
--- a/docs/event-producer-consumer.i18n.yaml
+++ b/docs/event-producer-consumer.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/event-producer-consumer.md
-event-producer-consumer.md: c26ca2d18995eb4e883815fd4f22ec4773d10728
-event-producer-consumer.zh.md: 588ec67cd55f40b5544b81603d23e65f3ebe1119
+event-producer-consumer.md: e9d9c436a8f52fcdb9de26e5de9cc3f3b9c79dbd
+event-producer-consumer.zh.md: 81e38e7171f3b6c44e97f47dc18b3a1976fbe7a2
diff --git a/docs/event-producer-consumer.md b/docs/event-producer-consumer.md
index c26ca2d189..e9d9c436a8 100644
--- a/docs/event-producer-consumer.md
+++ b/docs/event-producer-consumer.md
@@ -21,11 +21,11 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `agent/request-error` | `waterfall` | [`packages/core/agent/src/runtime-types.ts:353`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`compaction-basic`](../packages/compaction/compaction-basic), [`compaction-image-offload`](../packages/compaction/compaction-image-offload), [`llm-retry`](../packages/llm/llm-retry) |
 | `agent/status` | `emit` | [`packages/core/agent/src/runtime-types.ts:280`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`agent`](../packages/core/agent), `agent-team`, [`compaction-basic`](../packages/compaction/compaction-basic), [`goal-round-driver`](../packages/goal/goal-round-driver), [`schedule`](../packages/schedule/schedule), `server`, `session-controller` |
 | `agent/turn-stopping` | `serial` | [`packages/core/agent/src/runtime-types.ts:381`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`hooks-claude-code`](../packages/hooks/hooks-claude-code), [`hooks-codex`](../packages/hooks/hooks-codex), [`workspace-changes`](../packages/deliverables/workspace-changes) |
-| `api-session/activity` | `emit` | [`packages/api/session-controller/src/types.ts:600`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/added` | `emit` | [`packages/api/session-controller/src/types.ts:580`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/error` | `emit` | [`packages/api/session-controller/src/types.ts:607`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/removed` | `emit` | [`packages/api/session-controller/src/types.ts:586`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/status` | `emit` | [`packages/api/session-controller/src/types.ts:593`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/activity` | `emit` | [`packages/api/session-controller/src/types.ts:603`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/added` | `emit` | [`packages/api/session-controller/src/types.ts:583`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/error` | `emit` | [`packages/api/session-controller/src/types.ts:610`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/removed` | `emit` | [`packages/api/session-controller/src/types.ts:589`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/status` | `emit` | [`packages/api/session-controller/src/types.ts:596`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
 | `approval/request` | `waterfall` | [`packages/interaction/user-approval/src/types.ts:85`](../packages/interaction/user-approval/src/types.ts) | [`user-approval`](../packages/interaction/user-approval) (`waterfall`) | [`acp`](../packages/acp/acp), `remotes` |
 | `authorization/settled` | `emit` | [`packages/credentials/authorization/src/index.ts:57`](../packages/credentials/authorization/src/index.ts) | [`authorization`](../packages/credentials/authorization) (`events.dispatch`) | [`authorization`](../packages/credentials/authorization) |
 | `commands/change` | `emit` | [`packages/interaction/commands/src/types.ts:89`](../packages/interaction/commands/src/types.ts) | [`commands`](../packages/interaction/commands) (`events.dispatch`) | `remotes` |
diff --git a/docs/event-producer-consumer.zh.md b/docs/event-producer-consumer.zh.md
index 588ec67cd5..81e38e7171 100644
--- a/docs/event-producer-consumer.zh.md
+++ b/docs/event-producer-consumer.zh.md
@@ -23,11 +23,11 @@
 | `agent/request-error` | `waterfall` | [`packages/core/agent/src/runtime-types.ts:353`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`waterfall`) | [`compaction-basic`](../packages/compaction/compaction-basic), [`compaction-image-offload`](../packages/compaction/compaction-image-offload), [`llm-retry`](../packages/llm/llm-retry) |
 | `agent/status` | `emit` | [`packages/core/agent/src/runtime-types.ts:280`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`emit`) | [`agent`](../packages/core/agent), `agent-team`, [`compaction-basic`](../packages/compaction/compaction-basic), [`goal-round-driver`](../packages/goal/goal-round-driver), [`schedule`](../packages/schedule/schedule), `server`, `session-controller` |
 | `agent/turn-stopping` | `serial` | [`packages/core/agent/src/runtime-types.ts:381`](../packages/core/agent/src/runtime-types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`hooks-claude-code`](../packages/hooks/hooks-claude-code), [`hooks-codex`](../packages/hooks/hooks-codex), [`workspace-changes`](../packages/deliverables/workspace-changes) |
-| `api-session/activity` | `emit` | [`packages/api/session-controller/src/types.ts:600`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/added` | `emit` | [`packages/api/session-controller/src/types.ts:580`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/error` | `emit` | [`packages/api/session-controller/src/types.ts:607`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/removed` | `emit` | [`packages/api/session-controller/src/types.ts:586`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
-| `api-session/status` | `emit` | [`packages/api/session-controller/src/types.ts:593`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/activity` | `emit` | [`packages/api/session-controller/src/types.ts:603`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/added` | `emit` | [`packages/api/session-controller/src/types.ts:583`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/error` | `emit` | [`packages/api/session-controller/src/types.ts:610`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/removed` | `emit` | [`packages/api/session-controller/src/types.ts:589`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
+| `api-session/status` | `emit` | [`packages/api/session-controller/src/types.ts:596`](../packages/api/session-controller/src/types.ts) | `session-controller` (`emit`) | `remotes` |
 | `approval/request` | `waterfall` | [`packages/interaction/user-approval/src/types.ts:85`](../packages/interaction/user-approval/src/types.ts) | [`user-approval`](../packages/interaction/user-approval) (`waterfall`) | [`acp`](../packages/acp/acp), `remotes` |
 | `authorization/settled` | `emit` | [`packages/credentials/authorization/src/index.ts:57`](../packages/credentials/authorization/src/index.ts) | [`authorization`](../packages/credentials/authorization) (`events.dispatch`) | [`authorization`](../packages/credentials/authorization) |
 | `commands/change` | `emit` | [`packages/interaction/commands/src/types.ts:89`](../packages/interaction/commands/src/types.ts) | [`commands`](../packages/interaction/commands) (`events.dispatch`) | `remotes` |
diff --git a/docs/persistence-catalog.i18n.yaml b/docs/persistence-catalog.i18n.yaml
index ae6c4b51eb..13aa1bdf41 100644
--- a/docs/persistence-catalog.i18n.yaml
+++ b/docs/persistence-catalog.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/persistence-catalog.md
-persistence-catalog.md: 43b4f86125847625026bd5619216ccdc7be926c1
-persistence-catalog.zh.md: c655d97086fa60630aa5dae1bf3f93be595f179b
+persistence-catalog.md: d8ec0b383514434995e8825e2f1331e4e22ecc8c
+persistence-catalog.zh.md: 2ac58c08611a42bb149dd89fddb4e04595aca4f1
diff --git a/docs/persistence-catalog.md b/docs/persistence-catalog.md
index 43b4f86125..d8ec0b3835 100644
--- a/docs/persistence-catalog.md
+++ b/docs/persistence-catalog.md
@@ -662,7 +662,7 @@ Source: [`packages/llm/llm-retry/src/types.ts:11`](../packages/llm/llm-retry/src
 'model/selection': ModelSelection
 ```
 
-Source: [`packages/api/session-controller/src/types.ts:40`](../packages/api/session-controller/src/types.ts)
+Source: [`packages/api/session-controller/src/types.ts:41`](../packages/api/session-controller/src/types.ts)
 
 ### `permission/*`
 
@@ -4066,7 +4066,7 @@ Sources: [`packages/llm/llm/src/message.ts:24`](../packages/llm/llm/src/message.
 
 SHA-256: `f09e5e7acf5ff5ccd193ff2eeec015fa2ff7c29d98bc465f8c3302058d47e29b`
 
-Sources: [`packages/api/session-controller/src/types.ts:86`](../packages/api/session-controller/src/types.ts)
+Sources: [`packages/api/session-controller/src/types.ts:87`](../packages/api/session-controller/src/types.ts)
 
 | Property | Presence | Type |
 |---|---|---|
@@ -5304,7 +5304,7 @@ Array of `number`.
 
 SHA-256: `4cd48f3e5108bd6ebedf7301c3638839b8b2b9db8dbd493974177fbdeb91a01b`
 
-Sources: [`packages/api/session-controller/src/types.ts:380`](../packages/api/session-controller/src/types.ts) · [`packages/attachment/attachment/src/brand.ts:6`](../packages/attachment/attachment/src/brand.ts) · [`packages/compaction/compaction/src/brand.ts:4`](../packages/compaction/compaction/src/brand.ts) · [`packages/core/session/src/types.ts:20`](../packages/core/session/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:20`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:32`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:8`](../packages/experimental/agent-team/src/types.ts) · [`packages/feedback/message-feedback/src/types.ts:14`](../packages/feedback/message-feedback/src/types.ts) · [`packages/goal/goal/src/types.ts:17`](../packages/goal/goal/src/types.ts) · [`packages/interaction/commands/src/brand.ts:31`](../packages/interaction/commands/src/brand.ts) · [`packages/interaction/user-approval/src/types.ts:17`](../packages/interaction/user-approval/src/types.ts) · [`packages/llm/llm-retry/src/brand.ts:4`](../packages/llm/llm-retry/src/brand.ts) · [`packages/llm/llm/src/brand.ts:16`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:31`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:43`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:67`](../packages/llm/llm/src/brand.ts) · [`packages/schedule/schedule/src/types.ts:10`](../packages/schedule/schedule/src/types.ts) · [`packages/session/session-title/src/index.ts:42`](../packages/session/session-title/src/index.ts) · [`packages/session/session-title/src/types.ts:17`](../packages/session/session-title/src/types.ts) · [`packages/webhook/webhook/src/brand.ts:12`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:6`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:9`](../packages/webhook/webhook/src/brand.ts) · [`packages/workflow/workflow/src/types.ts:13`](../packages/workflow/workflow/src/types.ts)
+Sources: [`packages/api/session-controller/src/types.ts:383`](../packages/api/session-controller/src/types.ts) · [`packages/attachment/attachment/src/brand.ts:6`](../packages/attachment/attachment/src/brand.ts) · [`packages/compaction/compaction/src/brand.ts:4`](../packages/compaction/compaction/src/brand.ts) · [`packages/core/session/src/types.ts:20`](../packages/core/session/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:20`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:32`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:8`](../packages/experimental/agent-team/src/types.ts) · [`packages/feedback/message-feedback/src/types.ts:14`](../packages/feedback/message-feedback/src/types.ts) · [`packages/goal/goal/src/types.ts:17`](../packages/goal/goal/src/types.ts) · [`packages/interaction/commands/src/brand.ts:31`](../packages/interaction/commands/src/brand.ts) · [`packages/interaction/user-approval/src/types.ts:17`](../packages/interaction/user-approval/src/types.ts) · [`packages/llm/llm-retry/src/brand.ts:4`](../packages/llm/llm-retry/src/brand.ts) · [`packages/llm/llm/src/brand.ts:16`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:31`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:43`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:67`](../packages/llm/llm/src/brand.ts) · [`packages/schedule/schedule/src/types.ts:10`](../packages/schedule/schedule/src/types.ts) · [`packages/session/session-title/src/index.ts:42`](../packages/session/session-title/src/index.ts) · [`packages/session/session-title/src/types.ts:17`](../packages/session/session-title/src/types.ts) · [`packages/webhook/webhook/src/brand.ts:12`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:6`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:9`](../packages/webhook/webhook/src/brand.ts) · [`packages/workflow/workflow/src/types.ts:13`](../packages/workflow/workflow/src/types.ts)
 
 `string`
 
@@ -7195,7 +7195,7 @@ Sources: [`packages/core/tools/src/index.ts:34`](../packages/core/tools/src/inde
 
 SHA-256: `6a4f72e2e179e17b922f2a9392c0e1c8f8c707f32494372454850a3eb184a6e7`
 
-Sources: [`packages/api/session-controller/src/types.ts:385`](../packages/api/session-controller/src/types.ts)
+Sources: [`packages/api/session-controller/src/types.ts:388`](../packages/api/session-controller/src/types.ts)
 
 | Property | Presence | Type |
 |---|---|---|
diff --git a/docs/persistence-catalog.zh.md b/docs/persistence-catalog.zh.md
index c655d97086..2ac58c0861 100644
--- a/docs/persistence-catalog.zh.md
+++ b/docs/persistence-catalog.zh.md
@@ -664,7 +664,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
 'model/selection': ModelSelection
 ```
 
-来源：[`packages/api/session-controller/src/types.ts:40`](../packages/api/session-controller/src/types.ts)
+来源：[`packages/api/session-controller/src/types.ts:41`](../packages/api/session-controller/src/types.ts)
 
 ### `permission/*`
 
@@ -4068,7 +4068,7 @@ SHA-256: `719c51f67074f97034a6c94297fe1f4b5d3c8d392c57586dab732aa5398c7a91`
 
 SHA-256: `f09e5e7acf5ff5ccd193ff2eeec015fa2ff7c29d98bc465f8c3302058d47e29b`
 
-来源：[`packages/api/session-controller/src/types.ts:86`](../packages/api/session-controller/src/types.ts)
+来源：[`packages/api/session-controller/src/types.ts:87`](../packages/api/session-controller/src/types.ts)
 
 | 属性 | 存在性 | 类型 |
 |---|---|---|
@@ -5306,7 +5306,7 @@ SHA-256: `5d03ba38734809bcbd2a55221bd938b3b3fc34b49bb686c6113e9e4931e3aa78`
 
 SHA-256: `4cd48f3e5108bd6ebedf7301c3638839b8b2b9db8dbd493974177fbdeb91a01b`
 
-来源：[`packages/api/session-controller/src/types.ts:380`](../packages/api/session-controller/src/types.ts) · [`packages/attachment/attachment/src/brand.ts:6`](../packages/attachment/attachment/src/brand.ts) · [`packages/compaction/compaction/src/brand.ts:4`](../packages/compaction/compaction/src/brand.ts) · [`packages/core/session/src/types.ts:20`](../packages/core/session/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:20`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:32`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:8`](../packages/experimental/agent-team/src/types.ts) · [`packages/feedback/message-feedback/src/types.ts:14`](../packages/feedback/message-feedback/src/types.ts) · [`packages/goal/goal/src/types.ts:17`](../packages/goal/goal/src/types.ts) · [`packages/interaction/commands/src/brand.ts:31`](../packages/interaction/commands/src/brand.ts) · [`packages/interaction/user-approval/src/types.ts:17`](../packages/interaction/user-approval/src/types.ts) · [`packages/llm/llm-retry/src/brand.ts:4`](../packages/llm/llm-retry/src/brand.ts) · [`packages/llm/llm/src/brand.ts:16`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:31`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:43`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:67`](../packages/llm/llm/src/brand.ts) · [`packages/schedule/schedule/src/types.ts:10`](../packages/schedule/schedule/src/types.ts) · [`packages/session/session-title/src/index.ts:42`](../packages/session/session-title/src/index.ts) · [`packages/session/session-title/src/types.ts:17`](../packages/session/session-title/src/types.ts) · [`packages/webhook/webhook/src/brand.ts:12`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:6`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:9`](../packages/webhook/webhook/src/brand.ts) · [`packages/workflow/workflow/src/types.ts:13`](../packages/workflow/workflow/src/types.ts)
+来源：[`packages/api/session-controller/src/types.ts:383`](../packages/api/session-controller/src/types.ts) · [`packages/attachment/attachment/src/brand.ts:6`](../packages/attachment/attachment/src/brand.ts) · [`packages/compaction/compaction/src/brand.ts:4`](../packages/compaction/compaction/src/brand.ts) · [`packages/core/session/src/types.ts:20`](../packages/core/session/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:20`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:32`](../packages/experimental/agent-team/src/types.ts) · [`packages/experimental/agent-team/src/types.ts:8`](../packages/experimental/agent-team/src/types.ts) · [`packages/feedback/message-feedback/src/types.ts:14`](../packages/feedback/message-feedback/src/types.ts) · [`packages/goal/goal/src/types.ts:17`](../packages/goal/goal/src/types.ts) · [`packages/interaction/commands/src/brand.ts:31`](../packages/interaction/commands/src/brand.ts) · [`packages/interaction/user-approval/src/types.ts:17`](../packages/interaction/user-approval/src/types.ts) · [`packages/llm/llm-retry/src/brand.ts:4`](../packages/llm/llm-retry/src/brand.ts) · [`packages/llm/llm/src/brand.ts:16`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:31`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:43`](../packages/llm/llm/src/brand.ts) · [`packages/llm/llm/src/brand.ts:67`](../packages/llm/llm/src/brand.ts) · [`packages/schedule/schedule/src/types.ts:10`](../packages/schedule/schedule/src/types.ts) · [`packages/session/session-title/src/index.ts:42`](../packages/session/session-title/src/index.ts) · [`packages/session/session-title/src/types.ts:17`](../packages/session/session-title/src/types.ts) · [`packages/webhook/webhook/src/brand.ts:12`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:6`](../packages/webhook/webhook/src/brand.ts) · [`packages/webhook/webhook/src/brand.ts:9`](../packages/webhook/webhook/src/brand.ts) · [`packages/workflow/workflow/src/types.ts:13`](../packages/workflow/workflow/src/types.ts)
 
 `string`
 
@@ -7197,7 +7197,7 @@ SHA-256: `8fcb0b44a575e998665c053643d1ab04c82f39253ebd190ac0c975b78e40b543`
 
 SHA-256: `6a4f72e2e179e17b922f2a9392c0e1c8f8c707f32494372454850a3eb184a6e7`
 
-来源：[`packages/api/session-controller/src/types.ts:385`](../packages/api/session-controller/src/types.ts)
+来源：[`packages/api/session-controller/src/types.ts:388`](../packages/api/session-controller/src/types.ts)
 
 | 属性 | 存在性 | 类型 |
 |---|---|---|
diff --git a/docs/persistence-schema.json b/docs/persistence-schema.json
index 428d512264..c1fe9ea857 100644
--- a/docs/persistence-schema.json
+++ b/docs/persistence-schema.json
@@ -44144,7 +44144,7 @@
         "packages/workflow/workflow/src/types.ts#WorkflowRunId"
       ],
       "sources": [
-        "packages/api/session-controller/src/types.ts:380",
+        "packages/api/session-controller/src/types.ts:383",
         "packages/attachment/attachment/src/brand.ts:6",
         "packages/compaction/compaction/src/brand.ts:4",
         "packages/core/session/src/types.ts:20",
@@ -57727,7 +57727,7 @@
       },
       "names": [],
       "sources": [
-        "packages/api/session-controller/src/types.ts:385"
+        "packages/api/session-controller/src/types.ts:388"
       ]
     },
     {
@@ -86253,7 +86253,7 @@
         "packages/api/session-controller/src/types.ts#ModelSelection"
       ],
       "sources": [
-        "packages/api/session-controller/src/types.ts:86"
+        "packages/api/session-controller/src/types.ts:87"
       ]
     },
     {
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index dd6d3d7cad..50e7c215ae 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -54,8 +54,10 @@ export async function nativeFileApplications(
   const value: unknown = JSON.parse(stdout)
   if (!Array.isArray(value)) throw new Error('Invalid native application list')
   const applications: NativeFileApplication[] = []
-  for (const entry of value) {
+  const entries: readonly unknown[] = value
+  for (const entry of entries) {
     if (typeof entry !== 'object' || entry === null
+      || !('id' in entry) || !('name' in entry) || !('default' in entry) || !('icon' in entry)
       || typeof entry.id !== 'string' || entry.id.length === 0
       || typeof entry.name !== 'string' || typeof entry.default !== 'boolean'
       || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/png;base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 3f58c32145..0e6ff1c909 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -289,6 +289,7 @@
       "@deepseek-ai/dsh-session-log-export/client": ["./packages/session-query/session-log-export/src/client"],
       "@deepseek-ai/dsh-compaction-image-offload/projection": ["./packages/compaction/compaction-image-offload/src/projection.ts"],
       "@deepseek-ai/dsh-session-format-catalog/message-projections": ["./packages/session/session-format-catalog/src/message-projections.ts"],
+      "@deepseek-ai/dsh-native-command/types": ["./packages/util/native-command/src/types.ts"],
       // BEGIN generated package aliases — pnpm run gen-tsconfig-paths
       "@deepseek-ai/dsh-acp": ["./packages/acp/acp/src"],
       "@deepseek-ai/dsh-acp-app": ["./packages/bundle/acp-app/src"],
@@ -366,7 +367,6 @@
       "@deepseek-ai/dsh-mcp-client": ["./packages/mcp/mcp-client/src"],
       "@deepseek-ai/dsh-mcp-resources": ["./packages/mcp/mcp-resources/src"],
       "@deepseek-ai/dsh-message-feedback": ["./packages/feedback/message-feedback/src"],
-      "@deepseek-ai/dsh-native-command/types": ["./packages/util/native-command/src/types.ts"],
       "@deepseek-ai/dsh-native-command": ["./packages/util/native-command/src"],
       "@deepseek-ai/dsh-office-to-pdf": ["./packages/document/office-to-pdf/src"],
       "@deepseek-ai/dsh-output-retention": ["./packages/util/output-retention/src"],

From 79798d8c5a1934b278f93b5ef62dbf22bc4cf80a Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:00:05 +0800
Subject: [PATCH 10/62] fix: satisfy package publication and file-action
 coverage gates

---
 .../session-open-workspace-path.host.spec.ts      | 14 ++++++++++++++
 .../ui-open-in-app/src/client/OpenPathAction.tsx  |  2 +-
 .../tests/browser-plugin.client.spec.ts           |  3 +++
 .../tests/open-path-action.client.spec.tsx        | 15 +++++++++++++--
 .../ui-open-in-app/tests/open-path.client.spec.ts |  9 +++++++++
 packages/util/native-command/package.json         |  4 ++--
 6 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
index 63df8886bd..aaa23c11a0 100644
--- a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
+++ b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
@@ -237,3 +237,17 @@ it('uses the same path verification for handler queries and explicit application
   expect(fileApplications).toHaveBeenCalledOnce()
   expect(openFileApplication).toHaveBeenCalledOnce()
 })
+
+
+it('avoids desktop queries when unavailable and rejects an empty query path', async () => {
+  const fileApplications = vi.fn(async () => [])
+  const unavailable = createSessionTestController(await context(), {
+    defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', nativeOpen: false, fileApplications,
+  })
+  expect(await unavailable.workspacePathApplications({ path: '/file.mp3' }, new AbortController().signal)).toEqual([])
+  const available = createSessionTestController(await context(), {
+    defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', nativeOpen: true, fileApplications,
+  })
+  await expect(available.workspacePathApplications({ path: '' }, new AbortController().signal)).rejects.toMatchObject({ code: 'gateway/bad-request' })
+  expect(fileApplications).not.toHaveBeenCalled()
+})
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index af45eb7d1e..bc12a61103 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -125,7 +125,7 @@ export function OpenPathAction(props: OpenPathActionProps): ReactNode {
         ]}
         onSelect={(id) => {
           if (id.startsWith('app:')) run('open', id.slice(4))
-          else if (id === 'open' || id === 'reveal') run(id)
+          else run(id === 'reveal' ? 'reveal' : 'open')
         }}
         anchor={(
           <div className={css.split} data-open-path data-state={pending ? 'busy' : 'idle'}>
diff --git a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
index 14dc706604..da5f8f1c9b 100644
--- a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
@@ -74,6 +74,9 @@ describe('open-in-app browser half', () => {
     expect(face.hooks.openInAppDesktop.getSnapshot()).toBeNull()
     await Promise.all([face.loadDesktop(), emptyFace.loadDesktop()])
     expect(remote.session.canOpenWorkspacePath).toHaveBeenCalledOnce()
+    const signal = new AbortController().signal
+    await expect(face.applications('/w/clip.mp4', signal)).resolves.toEqual([])
+    expect(remote.session.workspacePathApplications).toHaveBeenCalledWith({ path: '/w/clip.mp4' }, signal)
     expect(face.hooks.openInAppDesktop.getSnapshot()).toBe(true)
     expect(await face.openPath('/w/clip.mp4', 'reveal')).toBeNull()
     expect(remote.session.openWorkspacePath).toHaveBeenLastCalledWith({ path: '/w/clip.mp4', action: 'reveal' })
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 45dfe9272b..0b1c017fd5 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -5,10 +5,10 @@
  * through their own toast.
  */
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { act, cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { act, cleanup, fireEvent, render, renderHook, screen } from '@testing-library/react'
 import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
-import { OpenPathAction, type OpenPathActionProps } from '../src/client/OpenPathAction.tsx'
+import { OpenPathAction, usePathGesture, type OpenPathActionProps } from '../src/client/OpenPathAction.tsx'
 import { OpenPathEmptyAction, type OpenPathEmptyActionProps } from '../src/client/OpenPathEmptyAction.tsx'
 import type { OpenInAppPathAction, OpenInAppPathFailure } from '../src/client/open-path.ts'
 import { zh } from '../src/client/locales.ts'
@@ -186,3 +186,14 @@ it('keeps default opening available when application discovery fails', async ()
   await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
 })
+
+
+it('coalesces repeated gestures before the busy state renders', async () => {
+  const pending = Promise.withResolvers<OpenInAppPathFailure | null>()
+  const b = bench({ openPath: vi.fn(() => pending.promise) })
+  const { result } = renderHook(() => usePathGesture(b.props))
+  act(() => { result.current.act('open'); result.current.act('open') })
+  expect(b.openPath).toHaveBeenCalledOnce()
+  await act(async () => { pending.resolve(null) })
+  expect(result.current.pending).toBe(false)
+})
diff --git a/packages/client/ui-open-in-app/tests/open-path.client.spec.ts b/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
index 1b1702cc2f..2def94a830 100644
--- a/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/open-path.client.spec.ts
@@ -85,3 +85,12 @@ it('queries current handlers and carries an explicit application without changin
   await controller.openPath('/file.mp3', 'open')
   expect(open).toHaveBeenLastCalledWith({ path: '/file.mp3' })
 })
+
+
+it('distinguishes failed association queries from an empty application list', async () => {
+  const remote = remoteOf({ workspacePathApplications: async () => ({ ok: false, error: new RemoteError('gateway/internal', 'unavailable', {}) }) })
+  const controller = new OpenInAppPathController(remote)
+  expect(await controller.applications('/file.mp3', new AbortController().signal)).toBeNull()
+  const rejecting = new OpenInAppPathController(remoteOf({ workspacePathApplications: async () => { throw new Error('disconnected') } }))
+  expect(await rejecting.applications('/file.mp3', new AbortController().signal)).toBeNull()
+})
diff --git a/packages/util/native-command/package.json b/packages/util/native-command/package.json
index 391b6c023d..9fc16ba0a9 100644
--- a/packages/util/native-command/package.json
+++ b/packages/util/native-command/package.json
@@ -27,8 +27,8 @@
   },
   "files": [
     "lib/index.js",
-    "lib/types/**/*.d.ts",
-    "lib/types/types.js"
+    "lib/types/**/*.js",
+    "lib/types/**/*.d.ts"
   ],
   "license": "MIT",
   "peerDependencies": {

From dd39d56af557eeed2bac1164c9f24abc00a7d39d Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:02:45 +0800
Subject: [PATCH 11/62] test: remove legacy unknown assertion from path-action
 fixture

---
 .../ui-open-in-app/tests/open-path-action.client.spec.tsx       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 0b1c017fd5..e6c7c90b64 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -43,7 +43,7 @@ function bench(over: { desktop?: boolean | null; openPath?: Bench['openPath'] }
     applications: vi.fn(async () => []),
     openPath,
     t,
-  } as unknown as Bench['props']
+  } as Bench['props']
   return { props, desktop, loadDesktop, openPath }
 }
 

From c6c9da3eba0fda0245ce2fa2f23a0dfbcf8051cf Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:03:54 +0800
Subject: [PATCH 12/62] chore: retire the removed path-action unknown-cast
 baseline

---
 scripts/no-unknown-casts.baseline.json | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/scripts/no-unknown-casts.baseline.json b/scripts/no-unknown-casts.baseline.json
index f5ecfea159..6f389f9866 100644
--- a/scripts/no-unknown-casts.baseline.json
+++ b/scripts/no-unknown-casts.baseline.json
@@ -632,9 +632,6 @@
     "d6ca469f487b05b19564776f9a8f8288b1f0d9fb5b7fb6681e68f063fb021f38": 1,
     "fdc0ec545dc17a50bdc1c64102915706cfbfdbb65a2165ae4691f29d577063cd": 1
   },
-  "packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx": {
-    "362d9206df82a6d4563c2e5c19457342207b02b246c91656dec01a4b2033fd8e": 1
-  },
   "packages/client/ui-permission-presets/tests/browser-plugin.client.spec.ts": {
     "dc36dd8f678695e3b84ce0573968470941c5b6fc5efe529cba17acb1f2799d1c": 1
   },

From e969aaff58d9ffc5fb37354e615b1aee22c2be5a Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:46:50 +0800
Subject: [PATCH 13/62] refactor: share compact opening controls for files and
 directories

---
 apps/web/tests/document-preview.e2e.ts        |   7 +-
 .../src/client/OpenInAppAction.module.css     |  64 ------
 .../src/client/OpenInAppAction.tsx            | 172 +++-------------
 .../src/client/OpenPathAction.tsx             | 156 ++++-----------
 .../src/client/OpenPathEmptyAction.module.css |  26 ---
 .../src/client/OpenPathEmptyAction.tsx        |  31 +--
 ...module.css => OpenTargetButton.module.css} |  45 ++++-
 .../src/client/OpenTargetButton.tsx           | 143 ++++++++++++++
 .../ui-open-in-app/src/client/locales.ts      |   4 +-
 .../tests/open-in-app-action.client.spec.tsx  | 187 +++++-------------
 .../tests/open-path-action.client.spec.tsx    |  51 +++--
 scripts/no-unknown-casts.baseline.json        |   4 -
 .../document-preview/applications.expected.md |   1 -
 .../web/document-preview/document.expected.md |   4 +-
 14 files changed, 328 insertions(+), 567 deletions(-)
 delete mode 100644 packages/client/ui-open-in-app/src/client/OpenInAppAction.module.css
 delete mode 100644 packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.module.css
 rename packages/client/ui-open-in-app/src/client/{OpenPathAction.module.css => OpenTargetButton.module.css} (50%)
 create mode 100644 packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx

diff --git a/apps/web/tests/document-preview.e2e.ts b/apps/web/tests/document-preview.e2e.ts
index dd35398713..171115a18b 100644
--- a/apps/web/tests/document-preview.e2e.ts
+++ b/apps/web/tests/document-preview.e2e.ts
@@ -748,7 +748,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
       '## Unviewable binary', '',
       '- State: unsupported',
       `- Line: ${unsupportedLine.trim()}`,
-      `- Header control: ${await headerOpen.innerText()}`,
+      `- Header control has no text: ${String(await headerOpen.innerText() === '')}`,
       `- Empty-state control: ${await emptyOpen.innerText()}`,
     ].join('\n'))
     if (STUB_OPENER) {
@@ -757,10 +757,11 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
       await emptyOpen.click()
       await expect.poll(async () => (await opened()).length, { timeout: 15_000 }).toBe(1)
       await unsupported.locator('[data-open-path-more]').click()
-      await page.getByRole('menuitem', { name: 'Show file location', exact: true }).click()
+      await page.getByRole('menuitem', { name: /^Show file location/ }).click()
       await expect.poll(async () => (await opened()).length, { timeout: 15_000 }).toBe(2)
       const gestures = await opened()
-      expect(gestures[0]).toEqual({ path: clip, action: 'open' })
+      expect(gestures[0]?.action).toBe(process.platform === 'darwin' ? 'open' : 'reveal')
+      expect([clip, cwd]).toContain(gestures[0]?.path)
       expect(gestures[1]?.action).toBe('reveal')
       expect([clip, cwd]).toContain(gestures[1]?.path)
       if (process.platform === 'darwin') {
diff --git a/packages/client/ui-open-in-app/src/client/OpenInAppAction.module.css b/packages/client/ui-open-in-app/src/client/OpenInAppAction.module.css
deleted file mode 100644
index f5186cc9a6..0000000000
--- a/packages/client/ui-open-in-app/src/client/OpenInAppAction.module.css
+++ /dev/null
@@ -1,64 +0,0 @@
-/* Compact Session-header split button beside the round icon buttons. */
-
-.split {
-  display: inline-flex;
-  align-items: stretch;
-  box-sizing: border-box;
-  height: 24px;
-  border: 0.5px solid var(--dsw-alias-border-l4);
-  border-radius: 9px;
-  overflow: hidden;
-  font-family: var(--dsw-font-family);
-}
-
-.main,
-.chevron {
-  display: inline-flex;
-  align-items: center;
-  gap: 3px;
-  border: 0;
-  background: none;
-  color: var(--dsw-alias-label-primary);
-  font-size: 11px;
-  font-weight: 400;
-  line-height: 16px;
-  cursor: pointer;
-  white-space: nowrap;
-}
-
-.main {
-  padding: 3px 5px;
-}
-
-.main:hover:not(:disabled),
-.main:focus-visible,
-.chevron:hover,
-.chevron:focus-visible {
-  background: var(--dsw-alias-interactive-bg-hover);
-}
-
-.main:disabled {
-  color: var(--dsw-alias-label-dimmed);
-  cursor: wait;
-}
-
-.main[data-state='error'] {
-  color: var(--dsw-alias-state-error-primary);
-  box-shadow: inset 0 0 0 1px var(--dsw-alias-state-error-primary);
-}
-
-.chevron {
-  padding: 3px 4px 3px 3px;
-  border-left: 0.5px solid var(--dsw-alias-border-l4);
-  color: var(--dsw-alias-label-secondary);
-}
-
-.icon {
-  flex: none;
-}
-
-img.icon {
-  display: block;
-  object-fit: contain;
-  user-select: none;
-}
diff --git a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
index 78f547a802..a58ed63933 100644
--- a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
@@ -1,10 +1,8 @@
-import { useEffect, useRef, useState } from 'react'
-import { IconChevronDownOutlineRegular, Menu, Tooltip, type MenuItem } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
 import type { InjectFace, PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '@deepseek-ai/dsh-client-ui-conversation/client'
 import { NS, type OpenInAppKey } from './locales.ts'
-import css from './OpenInAppAction.module.css'
+import { OpenTargetButton } from './OpenTargetButton.tsx'
 
 /** Browser operations and state injected into the Session Header contribution. */
 export interface OpenInAppActionInjected {
@@ -65,162 +63,36 @@ const APP_LABEL_KEY: Record<string, OpenInAppKey | undefined> = {
   konsole: 'app.konsole',
 }
 
-/** App ids whose icon image already failed this page; a 404 icon is fetched once, not per menu open. */
-const failedIcons = new Set<string>()
-
 /**
- * One application's real bundle icon (host-served PNG) with an inline generic
- * app-square fallback while the host has none.
- * @param props - catalog id, host icon URL, and rendered size.
- * @returns the icon image or its fallback glyph.
- */
-function AppIcon({ id, url, size }: { id: string; url: string; size: number }): React.JSX.Element {
-  const [failed, setFailed] = useState(failedIcons.has(id))
-  if (failed) {
-    return (
-      <svg
-        width={size}
-        height={size}
-        viewBox="0 0 24 24"
-        fill="none"
-        className={css.icon}
-        aria-hidden
-      >
-        <path d="M16 3H8C5.23858 3 3 5.23858 3 8V16C3 18.7614 5.23858 21 8 21H16C18.7614 21 21 18.7614 21 16V8C21 5.23858 18.7614 3 16 3Z" fill="currentColor" fillOpacity="0.05" />
-      </svg>
-    )
-  }
-  return (
-    <img
-      src={url}
-      width={size}
-      height={size}
-      className={css.icon}
-      alt=""
-      aria-hidden
-      draggable={false}
-      onError={() => {
-        failedIcons.add(id)
-        setFailed(true)
-      }}
-    />
-  )
-}
-
-/**
- * Quick launches settle well under this delay, so their busy dress never
- * paints — the visible dim-and-wait treatment is reserved for launches that
- * are actually taking a while, instead of flashing on every click.
- */
-const BUSY_DRESS_DELAY_MS = 250
-
-/**
- * Session-header split button: the main button opens the session's workspace
- * directory in the remembered application, the chevron opens the menu of
- * every application the host probed as installed. It renders nothing until
- * the host reported at least one nameable application and the session has a
- * known workspace directory, so a host without the capability never grows
- * the control.
- * @param props - session runtime, injected controller face, and localized copy.
- * @returns the split button and its menu, or null when there is nothing to offer.
+ * Adapt the installed directory catalog to the shared opening control.
+ * @param props - workspace state, installed catalog, and launch operations.
+ * @returns the shared control, or null without an eligible application and directory.
  */
 export function OpenInAppAction(props: OpenInAppActionProps): React.JSX.Element | null {
   const { sessionId, useSessions, useOpenInAppApps, useOpenInAppChoice, t } = props
   const cwd = useSessions(state => state.byId[sessionId]?.cwd)
   const available = useOpenInAppApps(apps => apps)
   const choice = useOpenInAppChoice(id => id)
-  const [open, setOpen] = useState(false)
-  const [phase, setPhase] = useState<'idle' | 'busy' | 'error'>('idle')
-  const inFlight = useRef(false)
-  const busyTimer = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
-  const errorTimer = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
-
-  useEffect(() => () => {
-    clearTimeout(busyTimer.current)
-    clearTimeout(errorTimer.current)
-  }, [])
-
-  const apps = (available ?? [])
-    .map(id => ({ id, labelKey: APP_LABEL_KEY[id] }))
-    .filter((entry): entry is { id: string; labelKey: OpenInAppKey } => entry.labelKey !== undefined)
-  const currentEntry = apps.find(entry => entry.id === choice) ?? apps[0]
-  if (currentEntry === undefined || cwd === undefined || cwd === '') return null
-
-  const current = currentEntry.id
-  const currentLabel = t(currentEntry.labelKey)
-  const title = phase === 'error' ? t('open.error') : t('open.title', { app: currentLabel })
-
-  const launch = (appId: string): void => {
-    if (inFlight.current) return
-    inFlight.current = true
-    // A pending error decay must not flip the button back to idle mid-launch.
-    clearTimeout(errorTimer.current)
-    clearTimeout(busyTimer.current)
-    busyTimer.current = setTimeout(() => { setPhase('busy') }, BUSY_DRESS_DELAY_MS)
-    props.launch(appId, cwd).then(() => {
-      inFlight.current = false
-      clearTimeout(busyTimer.current)
-      setPhase('idle')
-    }, () => {
-      inFlight.current = false
-      clearTimeout(busyTimer.current)
-      setPhase('error')
-      clearTimeout(errorTimer.current)
-      errorTimer.current = setTimeout(() => { setPhase('idle') }, 2_000)
-    })
-  }
-
-  const items: MenuItem[] = apps.map(entry => ({
-    id: entry.id,
-    label: t(entry.labelKey),
-    icon: <AppIcon id={entry.id} url={props.iconUrl(entry.id)} size={14} />,
-  }))
-
+  const apps = (available ?? []).flatMap((id) => {
+    const key = APP_LABEL_KEY[id]
+    return key === undefined ? [] : [{ id, name: t(key), icon: props.iconUrl(id) }]
+  })
+  const preferred = apps.find(app => app.id === choice) ?? apps[0]
+  if (preferred === undefined || cwd === undefined || cwd === '') return null
   return (
-    <Menu
-      open={open}
-      align="end"
-      dense
-      selection="fill"
-      onClose={() => { setOpen(false) }}
-      items={items}
-      selectedId={current}
-      onSelect={(id) => {
-        setOpen(false)
-        // A pick while a launch is in flight is ignored whole: persisting the
-        // choice without launching would leave the button naming an app the
-        // gesture never opened.
-        if (inFlight.current) return
-        props.choose(id)
-        launch(id)
+    <OpenTargetButton
+      key={cwd} kind="directory" applications={apps} defaultId={preferred.id} failed={false} t={t}
+      execute={async (operation) => {
+        const id = operation.kind === 'application' ? operation.id : preferred.id
+        try {
+          await props.launch(id, cwd)
+        } catch (_error) {
+          // Native launch failure is announced by the shared control.
+          return 'openError'
+        }
+        if (operation.kind === 'application') props.choose(id)
+        return null
       }}
-      anchor={(
-        <div className={css.split}>
-          <Tooltip label={phase === 'error' ? t('open.error') : t('open.tooltip')} side="bottom">
-            <button
-              type="button"
-              className={css.main}
-              data-state={phase}
-              disabled={phase === 'busy'}
-              aria-label={title}
-              onClick={() => { launch(current) }}
-            >
-              <AppIcon id={current} url={props.iconUrl(current)} size={13} />
-            </button>
-          </Tooltip>
-          <button
-            type="button"
-            className={css.chevron}
-            aria-expanded={open}
-            aria-haspopup="menu"
-            title={t('menu.toggle')}
-            aria-label={t('menu.toggle')}
-            onClick={() => { setOpen(value => !value) }}
-          >
-            <IconChevronDownOutlineRegular size={10} />
-          </button>
-        </div>
-      )}
     />
   )
 }
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index bc12a61103..317f392740 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -1,21 +1,13 @@
-/**
- * Document-header split button: the main button opens the previewed file in
- * its default application, the chevron's menu adds the file-manager reveal.
- * Both path controls share the gesture hook declared here.
- */
-import { useEffect, useRef, useState } from 'react'
+/** File association adapter for the shared file/directory opening control. */
+import { useEffect, useState } from 'react'
 import type { ReactNode } from 'react'
-import {
-  IconChevronDownOutlineRegular, IconFolderOpenOutlineRegular, IconRightUpOutlineRegular, Menu, Tooltip,
-} from '@deepseek-ai/dsh-client-ui-primitives'
 import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
-import type { InjectFace, PropsLocale, PropsRuntime, TranslateNS } from '@deepseek-ai/dsh-client-ui-slots'
+import type { InjectFace, PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client'
 import type { OpenInAppPathAction, OpenInAppPathFailure } from './open-path.ts'
-import { useOpenFailureToast } from './open-failure-toast.tsx'
+import { OpenTargetButton } from './OpenTargetButton.tsx'
 import type { NS } from './locales.ts'
-import css from './OpenPathAction.module.css'
 
 /** Desktop availability and the gesture carrier injected into both path controls. */
 export interface OpenPathInjected {
@@ -33,130 +25,52 @@ export type OpenPathActionProps =
   & PropsLocale<typeof NS>
   & InjectFace<OpenPathInjected>
 
-/** What one path control needs from its props: the file, the injected face, and copy. */
-type PathGestureProps = Pick<OpenPathActionProps, 'absolutePath' | 'useOpenInAppDesktop' | 'loadDesktop' | 'openPath'> & {
-  t: TranslateNS<typeof NS>
+/** File inputs shared by the document header and its unpreviewable state. */
+type FileOpenTargetProps = Pick<OpenPathActionProps, 'absolutePath' | 'useOpenInAppDesktop' | 'loadDesktop' | 'openPath' | 'applications' | 't'> & {
+  empty?: boolean
 }
 
 /**
- * Desktop availability, this control's own pending state, and a gesture
- * runner announcing failures through this control's toast. Only the control
- * that ran the gesture disables while it settles; failure never persists on
- * the control.
- * @param props - the file's Host path, the injected face, and copy.
- * @returns availability, pending, the toast to render, and the runner.
+ * Resolve file associations and adapt operations without embedding platform behavior in the control.
+ * @param props - verified file path, desktop query, native operations, and display variant.
+ * @returns the shared opening control, or null without a desktop.
  */
-export function usePathGesture({ absolutePath, useOpenInAppDesktop, loadDesktop, openPath, t }: PathGestureProps): {
-  available: boolean
-  pending: boolean
-  toast: ReactNode
-  act: (action: OpenInAppPathAction, application?: string) => void
-} {
-  const desktop = useOpenInAppDesktop(value => value)
-  const [pending, setPending] = useState(false)
-  const inFlight = useRef(false)
-  const { toast, show } = useOpenFailureToast()
-  useEffect(() => {
-    if (desktop === null) void loadDesktop()
-  }, [desktop, loadDesktop])
-  return {
-    available: desktop === true,
-    pending,
-    toast,
-    act: (action, application) => {
-      if (inFlight.current) return
-      inFlight.current = true
-      setPending(true)
-      void openPath(absolutePath, action, application).then((failure) => {
-        if (failure !== null) show(t(`path.${failure}`))
-      }).finally(() => { inFlight.current = false; setPending(false) })
-    },
-  }
-}
-
-/**
- * Render the split button, or nothing until the Host reports a desktop.
- * @param props - the previewed file, the injected face, and copy.
- * @returns the split button with its menu and toast, or null.
- */
-export function OpenPathAction(props: OpenPathActionProps): ReactNode {
-  const { t } = props
-  const [menuOpen, setMenuOpen] = useState(false)
-  const { available, pending, toast, act } = usePathGesture(props)
+export function FileOpenTarget(props: FileOpenTargetProps): ReactNode {
+  const desktop = props.useOpenInAppDesktop(value => value)
+  const [revision, setRevision] = useState(0)
   const [association, setAssociation] = useState<{
     path: string
     apps: readonly SessionWorkspacePathApplication[] | null
   } | null>(null)
   useEffect(() => {
-    if (!available) return
+    if (desktop === null) void props.loadDesktop()
+  }, [desktop, props.loadDesktop])
+  useEffect(() => {
+    if (desktop !== true) return
     const controller = new AbortController()
     void props.applications(props.absolutePath, controller.signal).then((apps) => {
       if (!controller.signal.aborted) setAssociation({ path: props.absolutePath, apps })
     })
     return () => { controller.abort() }
-  }, [available, props.absolutePath, props.applications, menuOpen])
+  }, [desktop, props.absolutePath, props.applications, revision])
+  if (desktop !== true) return null
   const apps = association?.path === props.absolutePath ? association.apps : null
-  const preferred = apps?.find(app => app.default)
-  if (!available) return null
-  const run = (action: OpenInAppPathAction, application?: string): void => {
-    setMenuOpen(false)
-    act(action, application)
-  }
   return (
-    <>
-      <Menu
-        className={css.menuAnchor}
-        open={menuOpen && !pending}
-        autoFocus
-        portal
-        dense
-        align="end"
-        onClose={() => { setMenuOpen(false) }}
-        items={[
-          { id: 'open', icon: <IconRightUpOutlineRegular />, label: t('path.defaultApp') },
-          ...(apps ?? []).map(app => ({
-            id: `app:${app.id}`,
-            icon: app.icon === null ? <IconRightUpOutlineRegular /> : <img src={app.icon} className={css.appIcon} alt="" />,
-            label: app.default ? t('path.appDefault', { app: app.name }) : app.name,
-          })),
-          ...(association?.path === props.absolutePath && apps === null
-            ? [{ id: 'unavailable', label: t('path.appsError'), disabled: true }] : []),
-          { id: 'reveal', icon: <IconFolderOpenOutlineRegular />, label: t('path.reveal') },
-        ]}
-        onSelect={(id) => {
-          if (id.startsWith('app:')) run('open', id.slice(4))
-          else run(id === 'reveal' ? 'reveal' : 'open')
-        }}
-        anchor={(
-          <div className={css.split} data-open-path data-state={pending ? 'busy' : 'idle'}>
-            <Tooltip label={t('path.open.tooltip')} side="bottom" delayMs={500}>
-              <button
-                type="button"
-                className={css.main}
-                disabled={pending}
-                data-open-path-open
-                onClick={() => { run('open') }}
-              >
-                {preferred?.icon != null && <img src={preferred.icon} className={css.appIcon} alt="" />}
-                {t('path.open')}
-              </button>
-            </Tooltip>
-            <button
-              type="button"
-              className={css.chevron}
-              disabled={pending}
-              aria-haspopup="menu"
-              aria-expanded={menuOpen && !pending}
-              aria-label={t('path.more')}
-              data-open-path-more
-              onClick={() => { setMenuOpen(value => !value) }}
-            >
-              <IconChevronDownOutlineRegular size={11} />
-            </button>
-          </div>
-        )}
-      />
-      {toast}
-    </>
+    <OpenTargetButton
+      key={props.absolutePath} kind="file" applications={apps ?? []} defaultId={apps?.find(app => app.default)?.id}
+      failed={association?.path === props.absolutePath && apps === null} empty={props.empty} t={props.t}
+      refresh={() => { setRevision(value => value + 1) }}
+      execute={operation => props.openPath(props.absolutePath, operation.kind === 'reveal' ? 'reveal' : 'open',
+        operation.kind === 'application' ? operation.id : undefined)}
+    />
   )
 }
+
+/**
+ * Render the file adapter in the document header.
+ * @param props - document owner inputs and injected opening capabilities.
+ * @returns the shared split button.
+ */
+export function OpenPathAction(props: OpenPathActionProps): ReactNode {
+  return <FileOpenTarget {...props} />
+}
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.module.css b/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.module.css
deleted file mode 100644
index cf9036e0d6..0000000000
--- a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.module.css
+++ /dev/null
@@ -1,26 +0,0 @@
-/* The empty state's capsule, sized like the preview's own Retry
-   (ui-sidebar-documentpreview TextPreview `.retry`) so the two recourses read
-   as one family. */
-.open {
-  display: inline-flex;
-  flex: none;
-  gap: 6px;
-  align-items: center;
-  height: 32px;
-  padding: 0 12px 0 14px;
-  color: var(--dsw-alias-label-primary);
-  font-size: var(--dsh-content-font-size-secondary, 13px);
-  font-family: inherit;
-  background: transparent;
-  border: 0.5px solid var(--dsw-alias-border-l2);
-  border-radius: 16px;
-  cursor: pointer;
-}
-
-.open:hover:not(:disabled) {
-  background: var(--dsw-alias-interactive-bg-hover);
-}
-
-.open:disabled {
-  cursor: default;
-}
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
index bf86006ed5..8294a7ab19 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
@@ -1,11 +1,9 @@
-/** Empty-state contribution: open a file the document preview cannot render in its default application. */
+/** File opening action in an unpreviewable document's empty state. */
 import type { ReactNode } from 'react'
-import { IconRightUpOutlineRegular } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { InjectFace, PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client'
 import type { NS } from './locales.ts'
-import { usePathGesture, type OpenPathInjected } from './OpenPathAction.tsx'
-import css from './OpenPathEmptyAction.module.css'
+import { FileOpenTarget, type OpenPathInjected } from './OpenPathAction.tsx'
 
 /** Full props of the unpreviewable empty-state contribution. */
 export type OpenPathEmptyActionProps =
@@ -14,27 +12,10 @@ export type OpenPathEmptyActionProps =
   & InjectFace<OpenPathInjected>
 
 /**
- * Render the default-application open button, or nothing until the Host reports a desktop.
- * @param props - the unpreviewable file, the injected face, and copy.
- * @returns the open button and its toast, or null.
+ * Render the same file default action without a dropdown.
+ * @param props - unpreviewable file and injected opening capabilities.
+ * @returns the shared file opening action.
  */
 export function OpenPathEmptyAction(props: OpenPathEmptyActionProps): ReactNode {
-  const { t } = props
-  const { available, pending, toast, act } = usePathGesture(props)
-  if (!available) return null
-  return (
-    <>
-      <button
-        type="button"
-        className={css.open}
-        disabled={pending}
-        data-open-path-unpreviewable
-        onClick={() => { act('open') }}
-      >
-        {t('path.unpreviewable')}
-        <IconRightUpOutlineRegular size={14} />
-      </button>
-      {toast}
-    </>
-  )
+  return <FileOpenTarget {...props} empty />
 }
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
similarity index 50%
rename from packages/client/ui-open-in-app/src/client/OpenPathAction.module.css
rename to packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
index 2c770905cf..66a890bfa2 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.module.css
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
@@ -1,4 +1,4 @@
-/* Sized to sit in the document header's 28px control row beside its round
+/* Sized to sit in the document header's 24px control row beside its round
    icon buttons: a hairline pill with a 12px label and a narrow chevron half. */
 
 .menuAnchor {
@@ -11,10 +11,10 @@
   display: inline-flex;
   align-items: stretch;
   box-sizing: border-box;
-  height: 28px;
+  height: 24px;
   overflow: hidden;
-  border: 0.5px solid var(--dsw-alias-border-l3);
-  border-radius: 14px;
+  border: 0.5px solid var(--dsw-alias-border-l4);
+  border-radius: 9px;
   font-family: var(--dsw-font-family);
 }
 
@@ -26,7 +26,7 @@
   border: 0;
   background: none;
   color: var(--dsw-alias-label-primary);
-  font-size: 12px;
+  font-size: 11px;
   line-height: 16px;
   white-space: nowrap;
   cursor: pointer;
@@ -34,12 +34,12 @@
 
 .main {
   gap: 4px;
-  padding: 5px 8px 5px 10px;
+  padding: 3px 5px;
 }
 
 .chevron {
-  padding: 5px 6px 5px 4px;
-  border-left: 0.5px solid var(--dsw-alias-border-l3);
+  padding: 3px 4px 3px 3px;
+  border-left: 0.5px solid var(--dsw-alias-border-l4);
   color: var(--dsw-alias-label-secondary);
 }
 
@@ -57,7 +57,32 @@
 }
 
 .appIcon {
-  width: 16px;
-  height: 16px;
   object-fit: contain;
 }
+
+/* The empty state's capsule, sized like the preview's own Retry
+   (ui-sidebar-documentpreview TextPreview `.retry`) so the two recourses read
+   as one family. */
+.empty {
+  display: inline-flex;
+  flex: none;
+  gap: 6px;
+  align-items: center;
+  height: 32px;
+  padding: 0 12px 0 14px;
+  color: var(--dsw-alias-label-primary);
+  font-size: var(--dsh-content-font-size-secondary, 13px);
+  font-family: inherit;
+  background: transparent;
+  border: 0.5px solid var(--dsw-alias-border-l2);
+  border-radius: 16px;
+  cursor: pointer;
+}
+
+.empty:hover:not(:disabled) {
+  background: var(--dsw-alias-interactive-bg-hover);
+}
+
+.empty:disabled {
+  cursor: default;
+}
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
new file mode 100644
index 0000000000..570e8f4914
--- /dev/null
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -0,0 +1,143 @@
+/** Shared file and directory opener: one default action, application menu, and per-gesture feedback. */
+import { useRef, useState } from 'react'
+import type { ReactNode } from 'react'
+import {
+  IconChevronDownOutlineRegular, IconFolderOpenOutlineRegular, IconRightUpOutlineRegular, Menu, Tooltip,
+} from '@deepseek-ai/dsh-client-ui-primitives'
+import type { TranslateNS } from '@deepseek-ai/dsh-client-ui-slots'
+import type { OpenInAppPathFailure } from './open-path.ts'
+import { useOpenFailureToast } from './open-failure-toast.tsx'
+import type { NS } from './locales.ts'
+import css from './OpenTargetButton.module.css'
+
+/** Application metadata supplied by either the directory catalog or a file association query. */
+export interface OpenTargetApplication {
+  readonly id: string
+  readonly name: string
+  readonly icon: string | null
+}
+
+/** Opening intent; default selection remains owned by the target's adapter. */
+export type OpenTargetOperation = { readonly kind: 'default' } | { readonly kind: 'application'; readonly id: string } | { readonly kind: 'reveal' }
+
+/** Inputs shared by both target adapters and the file empty-state action. */
+export interface OpenTargetButtonProps {
+  readonly kind: 'file' | 'directory'
+  readonly applications: readonly OpenTargetApplication[]
+  readonly defaultId: string | undefined
+  readonly failed: boolean
+  readonly empty?: boolean
+  readonly t: TranslateNS<typeof NS>
+  readonly execute: (operation: OpenTargetOperation) => Promise<OpenInAppPathFailure | null>
+  readonly refresh?: () => void
+}
+
+/**
+ * Serialize gestures and announce their failures through the initiating control's toast.
+ * @param execute - target adapter that returns the failure to announce, or null.
+ * @param t - localized control copy.
+ * @returns the pending state, feedback, and guarded action callback.
+ */
+export function useOpenTargetGesture(execute: OpenTargetButtonProps['execute'], t: TranslateNS<typeof NS>): {
+  pending: boolean
+  toast: ReactNode
+  act: (operation: OpenTargetOperation) => void
+} {
+  const [pending, setPending] = useState(false)
+  const inFlight = useRef(false)
+  const { toast, show } = useOpenFailureToast()
+  return {
+    pending,
+    toast,
+    act: (operation) => {
+      if (inFlight.current) return
+      inFlight.current = true
+      setPending(true)
+      void execute(operation).then((failure) => {
+        if (failure !== null) show(t(`path.${failure}`))
+      }).finally(() => { inFlight.current = false; setPending(false) })
+    },
+  }
+}
+
+/** One application image with a per-image fallback, shared by main and menu buttons. */
+function ApplicationIcon({ source, size = 14 }: { source: string | null; size?: number }): ReactNode {
+  const [failed, setFailed] = useState(false)
+  return source === null || failed
+    ? <IconRightUpOutlineRegular size={size} />
+    : <img src={source} width={size} height={size} className={css.appIcon} alt="" draggable={false} onError={() => { setFailed(true) }} />
+}
+
+/**
+ * Render identical split buttons for files and directories. File reveal always stays last and becomes the default when no app is selected.
+ * @param props - target applications, default selection, and operations.
+ * @returns the control and its transient failure feedback.
+ */
+export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
+  const { applications, defaultId, kind, t } = props
+  const [menuOpen, setMenuOpen] = useState(false)
+  const { pending, toast, act } = useOpenTargetGesture(props.execute, t)
+  const preferred = applications.find(app => app.id === defaultId)
+  const revealDefault = kind === 'file' && preferred === undefined
+  const primaryLabel = revealDefault ? t('path.reveal') : t('open.title', { app: preferred?.name ?? '' })
+  const run = (operation: OpenTargetOperation): void => { setMenuOpen(false); act(operation) }
+  const primary = (): void => { run({ kind: revealDefault ? 'reveal' : 'default' }) }
+  const icon = revealDefault
+    ? <IconFolderOpenOutlineRegular size={13} />
+    : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={13} />
+  if (props.empty === true) return (
+    <>
+      <button type="button" className={css.empty} disabled={pending} data-open-path-unpreviewable onClick={primary}>
+        {t('path.open')}{icon}
+      </button>
+      {toast}
+    </>
+  )
+  return (
+    <>
+      <Menu
+        className={css.menuAnchor}
+        open={menuOpen && !pending}
+        autoFocus
+        portal
+        dense
+        align="end"
+        onClose={() => { setMenuOpen(false) }}
+        items={[
+          ...applications.map(app => ({
+            id: `app:${app.id}`,
+            icon: <ApplicationIcon key={app.icon} source={app.icon} />,
+            label: app.id === defaultId ? t('path.appDefault', { app: app.name }) : app.name,
+          })),
+          ...(props.failed ? [{ id: 'unavailable', label: t('path.appsError'), disabled: true }] : []),
+          ...(kind === 'file' ? [{
+            id: 'reveal', icon: <IconFolderOpenOutlineRegular />,
+            label: revealDefault ? t('path.appDefault', { app: t('path.reveal') }) : t('path.reveal'),
+          }] : []),
+        ]}
+        onSelect={(id) => { run(id === 'reveal' ? { kind: 'reveal' } : { kind: 'application', id: id.slice(4) }) }}
+        anchor={(
+          <div className={css.split} data-open-target={kind} data-open-path={kind === 'file' ? '' : undefined} data-state={pending ? 'busy' : 'idle'}>
+            <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
+              <button type="button" className={css.main} disabled={pending} aria-label={primaryLabel} data-open-path-open={kind === 'file' ? '' : undefined} onClick={primary}>
+                {icon}
+              </button>
+            </Tooltip>
+            <button
+              type="button" className={css.chevron} disabled={pending}
+              aria-haspopup="menu" aria-expanded={menuOpen && !pending} aria-label={t('path.more')}
+              data-open-path-more={kind === 'file' ? '' : undefined}
+              onClick={() => {
+                if (!menuOpen) props.refresh?.()
+                setMenuOpen(value => !value)
+              }}
+            >
+              <IconChevronDownOutlineRegular size={10} />
+            </button>
+          </div>
+        )}
+      />
+      {toast}
+    </>
+  )
+}
diff --git a/packages/client/ui-open-in-app/src/client/locales.ts b/packages/client/ui-open-in-app/src/client/locales.ts
index bb198d640c..77d24914f3 100644
--- a/packages/client/ui-open-in-app/src/client/locales.ts
+++ b/packages/client/ui-open-in-app/src/client/locales.ts
@@ -39,7 +39,7 @@ const PRODUCT_NAMES = {
 
 /** Simplified Chinese dictionary (the key-set source of truth). */
 export const zh = {
-  'open.title': '在 {app} 中打开工作目录',
+  'open.title': '在 {app} 中打开',
   'open.tooltip': '在本地打开',
   'open.error': '打开失败',
   'menu.toggle': '选择打开方式',
@@ -63,7 +63,7 @@ export const zh = {
 
 /** English dictionary, key-identical to the Chinese source of truth. */
 export const en: Record<OpenInAppKey, string> = {
-  'open.title': 'Open workspace in {app}',
+  'open.title': 'Open in {app}',
   'open.tooltip': 'Open locally',
   'open.error': 'Failed to open',
   'menu.toggle': 'Choose an app to open in',
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 62f1ba2295..0116963d6e 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { cleanup, fireEvent, render, screen, waitFor, act } from '@testing-library/react'
+import { cleanup, fireEvent, render, screen, act } from '@testing-library/react'
 import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { SessionListState } from '@deepseek-ai/dsh-api-session-controller/client'
@@ -37,7 +37,7 @@ function bench(over: {
     projectionsBySession: {},
     jobsBySession: {},
     currentAddress: undefined,
-  } as unknown as SessionListState
+  } as SessionListState
   const apps = createSnapshotStore<readonly string[] | null>(over.apps ?? null)
   const choice = createSnapshotStore<string>(over.choice ?? '')
   const launch = vi.fn(over.launch ?? (async () => {}))
@@ -57,7 +57,7 @@ function bench(over: {
     choose,
     iconUrl: (appId: string) => `open-in-app/icon/${appId}`,
     t,
-  } as unknown as OpenInAppActionProps
+  } as OpenInAppActionProps
   return { props, launch, choose }
 }
 
@@ -88,156 +88,57 @@ describe('OpenInAppAction visibility', () => {
 })
 
 describe('OpenInAppAction launching', () => {
-  it('launches without painting the busy dress when the launch settles quickly', async () => {
-    let resolve: () => void = () => {}
-    const b = bench({
-      apps: ['finder'],
-      cwd: '/w/dir',
-      launch: () => new Promise((r) => { resolve = r }),
-    })
+  it('disables both buttons and ignores duplicate gestures until the launch settles', async () => {
+    const pending = Promise.withResolvers<undefined>()
+    const b = bench({ apps: ['finder', 'cursor'], cwd: '/w/dir', launch: () => pending.promise })
+    const view = render(<OpenInAppAction {...b.props} />)
+    const main = screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) })
+    fireEvent.click(main)
+    expect(main).toHaveProperty('disabled', true)
+    expect(screen.getByRole('button', { name: zh['path.more'] })).toHaveProperty('disabled', true)
+    fireEvent.click(main)
+    expect(b.launch).toHaveBeenCalledOnce()
+    expect(view.container.querySelector('[data-open-target]')?.getAttribute('data-state')).toBe('busy')
+    await act(async () => { pending.resolve(undefined) })
+    expect(main).toHaveProperty('disabled', false)
+  })
+
+  it('announces launch failure without changing the remembered application', async () => {
+    const b = bench({ apps: ['finder', 'cursor'], cwd: '/w', launch: async () => { throw new Error('gone') } })
     render(<OpenInAppAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })
-    fireEvent.click(main)
-    expect(b.launch).toHaveBeenCalledWith('finder', '/w/dir')
-    // No flash: the button keeps its idle dress while the launch is fast.
-    expect((main as HTMLButtonElement).disabled).toBe(false)
-    expect(main.getAttribute('data-state')).toBe('idle')
-    // A second click while in flight is ignored rather than double-launching.
-    fireEvent.click(main)
-    expect(b.launch).toHaveBeenCalledTimes(1)
-
-    resolve()
-    await waitFor(() => {
-      fireEvent.click(main)
-      expect(b.launch).toHaveBeenCalledTimes(2)
-    })
+    fireEvent.click(screen.getByRole('button', { name: zh['path.more'] }))
+    await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Cursor' })) })
+    expect(screen.getByRole('alert').textContent).toContain(zh['path.openError'])
+    expect(b.choose).not.toHaveBeenCalled()
   })
 
-  it('dresses a slow launch as busy, then shows the error state on failure', async () => {
-    vi.useFakeTimers()
-    let reject: (error: Error) => void = () => {}
-    const b = bench({
-      apps: ['finder'],
-      cwd: '/w/dir',
-      launch: () => new Promise((_, r) => { reject = r }),
-    })
-    render(<OpenInAppAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })
-    fireEvent.click(main)
-
-    // The busy dress appears only after the launch has taken a while.
-    act(() => { vi.advanceTimersByTime(300) })
-    expect((main as HTMLButtonElement).disabled).toBe(true)
-    expect(main.getAttribute('data-state')).toBe('busy')
-
-    act(() => { reject(new Error('launch failed')) })
-    await act(async () => { await vi.runOnlyPendingTimersAsync() })
-    expect(screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })).toBeDefined()
-  })
-
-  it('shows the error state and decays back to idle after a fast failure', async () => {
-    const b = bench({
-      apps: ['finder'],
-      cwd: '/w/dir',
-      launch: () => Promise.reject(new Error('launch failed')),
-    })
-    render(<OpenInAppAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })
-    fireEvent.click(main)
-    await waitFor(() => {
-      expect(screen.getByRole('button', { name: zh['open.error'] })).toBeDefined()
-    })
-    // The error state decays back to idle.
-    await waitFor(() => {
-      expect(screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })).toBeDefined()
-    }, { timeout: 4_000 })
-  })
-
-  it('shows the product tooltip on hover instead of a native title', async () => {
-    render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w/dir' }).props} />)
-    const main = screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })
-    expect(main.getAttribute('title')).toBeNull()
-    fireEvent.mouseEnter(main)
-    expect(await screen.findByText(zh['open.tooltip'])).toBeDefined()
-    fireEvent.mouseLeave(main)
-    await waitFor(() => {
-      expect(screen.queryByText(zh['open.tooltip'])).toBeNull()
-    })
-  })
-
-  it('opens the menu from the chevron, launches and persists a picked app', async () => {
+  it('lists only applications, marks the remembered default, and remembers a successful choice', async () => {
     const b = bench({ apps: ['finder', 'cursor', 'terminal'], cwd: '/w/dir' })
     render(<OpenInAppAction {...b.props} />)
-    fireEvent.click(screen.getByRole('button', { name: zh['menu.toggle'] }))
-    const cursorItem = await screen.findByText('Cursor')
-    fireEvent.click(cursorItem)
-    expect(b.choose).toHaveBeenCalledWith('cursor')
+    fireEvent.click(screen.getByRole('button', { name: zh['path.more'] }))
+    expect(screen.getAllByRole('menuitem').map(item => item.textContent)).toEqual(['访达（默认）', 'Cursor', '终端'])
+    expect(screen.queryByText(zh['path.reveal'])).toBeNull()
+    await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Cursor' })) })
     expect(b.launch).toHaveBeenCalledWith('cursor', '/w/dir')
+    expect(b.choose).toHaveBeenCalledWith('cursor')
   })
 
-  it('ignores a menu pick while a launch is in flight', async () => {
-    let resolve: () => void = () => {}
-    const b = bench({
-      apps: ['finder', 'cursor'],
-      cwd: '/w/dir',
-      launch: () => new Promise((r) => { resolve = r }),
-    })
-    render(<OpenInAppAction {...b.props} />)
-    fireEvent.click(screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) }))
-    expect(b.launch).toHaveBeenCalledTimes(1)
-    fireEvent.click(screen.getByRole('button', { name: zh['menu.toggle'] }))
-    fireEvent.click(await screen.findByText('Cursor'))
-    // Mid-flight the pick is ignored whole: no persisted choice, no launch.
-    expect(b.choose).not.toHaveBeenCalled()
-    expect(b.launch).toHaveBeenCalledTimes(1)
-    resolve()
-    await act(async () => {})
-  })
-
-  it('clears a pending error decay when a retry starts', async () => {
-    vi.useFakeTimers()
-    const outcomes: Array<() => Promise<void>> = [
-      () => Promise.reject(new Error('launch failed')),
-      // The retry stays in flight past the original decay deadline.
-      () => new Promise(() => {}),
-    ]
-    const b = bench({
-      apps: ['finder'],
-      cwd: '/w/dir',
-      launch: () => (outcomes.shift() ?? (() => Promise.resolve()))(),
-    })
-    render(<OpenInAppAction {...b.props} />)
-    fireEvent.click(screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) }))
-    await act(async () => {})
-    fireEvent.click(screen.getByRole('button', { name: zh['open.error'] }))
-    // Past the first failure's 2s decay: the stale timer must not flip the
-    // in-flight retry's busy dress back to a clickable idle button.
-    act(() => { vi.advanceTimersByTime(2_500) })
-    const main = screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })
-    expect(main.getAttribute('data-state')).toBe('busy')
-    expect((main as HTMLButtonElement).disabled).toBe(true)
-  })
-
-  it('closes an open menu on Escape without launching', async () => {
-    const b = bench({ apps: ['finder', 'terminal'], cwd: '/w/dir' })
-    render(<OpenInAppAction {...b.props} />)
-    fireEvent.click(screen.getByRole('button', { name: zh['menu.toggle'] }))
-    await screen.findByText(zh['app.terminal'])
-    fireEvent.keyDown(document, { key: 'Escape' })
-    await waitFor(() => {
-      expect(screen.queryByText(zh['app.terminal'])).toBeNull()
-    })
+  it('closes on Escape without launching and falls back after an icon fails', async () => {
+    const b = bench({ apps: ['finder', 'terminal'], cwd: '/w' })
+    const view = render(<OpenInAppAction {...b.props} />)
+    fireEvent.click(screen.getByRole('button', { name: zh['path.more'] }))
+    fireEvent.keyDown(screen.getByRole('menu'), { key: 'Escape' })
+    expect(screen.queryByRole('menu')).toBeNull()
     expect(b.launch).not.toHaveBeenCalled()
+    const image = view.container.querySelector('img')!
+    fireEvent.error(image)
+    expect(view.container.querySelector('img')).toBeNull()
+    expect(view.container.querySelector('svg')).not.toBeNull()
   })
 
-  it('falls back to the generic icon after a failed image load', async () => {
-    const b = bench({ apps: ['terminal'], cwd: '/w/dir' })
-    const { container } = render(<OpenInAppAction {...b.props} />)
-    const img = container.querySelector('img')
-    if (img !== null) fireEvent.error(img)
-    await waitFor(() => {
-      expect(container.querySelector('img')).toBeNull()
-      expect(container.querySelector('svg path[fill-opacity="0.05"]')).not.toBeNull()
-    })
+  it('uses the shared product tooltip', async () => {
+    render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w' }).props} />)
+    fireEvent.mouseEnter(screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) }))
+    expect(await screen.findByText(zh['open.tooltip'])).toBeTruthy()
   })
 })
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index e6c7c90b64..961b066a3a 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -8,9 +8,10 @@ import { afterEach, describe, expect, it, vi } from 'vitest'
 import { act, cleanup, fireEvent, render, renderHook, screen } from '@testing-library/react'
 import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
-import { OpenPathAction, usePathGesture, type OpenPathActionProps } from '../src/client/OpenPathAction.tsx'
+import { OpenPathAction, type OpenPathActionProps } from '../src/client/OpenPathAction.tsx'
 import { OpenPathEmptyAction, type OpenPathEmptyActionProps } from '../src/client/OpenPathEmptyAction.tsx'
 import type { OpenInAppPathAction, OpenInAppPathFailure } from '../src/client/open-path.ts'
+import { useOpenTargetGesture } from '../src/client/OpenTargetButton.tsx'
 import { zh } from '../src/client/locales.ts'
 
 afterEach(() => {
@@ -40,7 +41,7 @@ function bench(over: { desktop?: boolean | null; openPath?: Bench['openPath'] }
     absolutePath: ABSOLUTE_PATH,
     useOpenInAppDesktop: useSelector(desktop),
     loadDesktop,
-    applications: vi.fn(async () => []),
+    applications: vi.fn(async () => [{ id: '/Music.app', name: 'Music', default: true, icon: null }]),
     openPath,
     t,
   } as Bench['props']
@@ -64,7 +65,7 @@ describe('OpenPathAction gestures', () => {
   it('opens the file in its default application from the main button and reveals it from the menu', async () => {
     const b = bench()
     render(<OpenPathAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['path.open'] })
+    const main = await screen.findByRole('button', { name: t('open.title', { app: 'Music' }) })
     await act(async () => { fireEvent.click(main) })
     expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
     fireEvent.click(screen.getByRole('button', { name: zh['path.more'] }))
@@ -76,6 +77,7 @@ describe('OpenPathAction gestures', () => {
   it('offers the default application from the menu too, and Escape closes the menu without a gesture', async () => {
     const b = bench()
     render(<OpenPathAction {...b.props} />)
+    await act(async () => {})
     const more = screen.getByRole('button', { name: zh['path.more'] })
     fireEvent.click(more)
     expect(more.getAttribute('aria-expanded')).toBe('true')
@@ -83,15 +85,15 @@ describe('OpenPathAction gestures', () => {
     expect(screen.queryByRole('menu')).toBeNull()
     expect(b.openPath).not.toHaveBeenCalled()
     fireEvent.click(more)
-    await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
-    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
+    await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Music（默认）' })) })
+    expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', '/Music.app')
   })
 
   it('disables both halves while its own gesture settles and leaves no failure on the control', async () => {
     const settled = Promise.withResolvers<OpenInAppPathFailure | null>()
     const b = bench({ openPath: vi.fn(() => settled.promise) })
     const { container } = render(<OpenPathAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['path.open'] })
+    const main = await screen.findByRole('button', { name: t('open.title', { app: 'Music' }) })
     fireEvent.click(main)
     expect(main).toHaveProperty('disabled', true)
     expect(screen.getByRole('button', { name: zh['path.more'] })).toHaveProperty('disabled', true)
@@ -112,7 +114,8 @@ describe('OpenPathEmptyAction', () => {
     cleanup()
     const b = bench()
     render(<OpenPathEmptyAction {...b.props} />)
-    await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.unpreviewable'] })) })
+    await act(async () => {})
+    await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
     expect(b.openPath).toHaveBeenCalledWith(ABSOLUTE_PATH, 'open', undefined)
     expect(screen.queryByRole('alert')).toBeNull()
   })
@@ -121,7 +124,8 @@ describe('OpenPathEmptyAction', () => {
     vi.useFakeTimers()
     const b = bench({ openPath: vi.fn(async () => 'openError' as const) })
     render(<OpenPathEmptyAction {...b.props} />)
-    await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.unpreviewable'] })) })
+    await act(async () => {})
+    await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
     expect(screen.getAllByRole('alert')).toHaveLength(1)
     expect(screen.getByRole('alert').textContent).toContain(zh['path.openError'])
     act(() => { vi.advanceTimersByTime(4_000) })
@@ -133,9 +137,11 @@ it('dismisses a failure on schedule even when its owner rerenders', async () =>
   vi.useFakeTimers()
   const b = bench({ openPath: vi.fn(async () => 'openError' as const) })
   const view = render(<OpenPathEmptyAction {...b.props} />)
-  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.unpreviewable'] })) })
+  await act(async () => {})
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
   act(() => { vi.advanceTimersByTime(2_000) })
   view.rerender(<OpenPathEmptyAction {...b.props} />)
+  await act(async () => {})
   act(() => { vi.advanceTimersByTime(1_999) })
   expect(screen.getByRole('alert')).toBeTruthy()
   act(() => { vi.advanceTimersByTime(1) })
@@ -157,7 +163,7 @@ it('shows the default icon and current application list, and selects an applicat
   expect(screen.getByRole('menuitem', { name: 'Music（默认）' })).toBeTruthy()
   await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Player' })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', '/Player.app')
-  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.open'] })) })
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: t('open.title', { app: 'Music' }) })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
 })
 
@@ -178,21 +184,34 @@ it('ignores an obsolete file query and refreshes the default application when th
   expect(applications).toHaveBeenLastCalledWith('/other.mp3', expect.any(AbortSignal))
 })
 
-it('keeps default opening available when application discovery fails', async () => {
+it('keeps reveal last and makes it the default when the file query fails', async () => {
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => null} />)
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
-  expect(screen.getByRole('menuitem', { name: zh['path.appsError'] }).hasAttribute('disabled')).toBe(true)
-  await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: zh['path.defaultApp'] })) })
-  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', undefined)
+  const items = screen.getAllByRole('menuitem')
+  expect(items.map(item => item.textContent)).toEqual([zh['path.appsError'], '显示文件位置（默认）'])
+  expect(items[0]).toHaveProperty('disabled', true)
+  await act(async () => { fireEvent.click(items[1]!) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
+})
+
+it.each([[], [{ id: '/Player.app', name: 'Player', default: false, icon: null }]])('uses reveal as the default after the available applications when none is default', async (apps) => {
+  const b = bench()
+  render(<OpenPathAction {...b.props} applications={async () => apps} />)
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  expect(screen.getAllByRole('menuitem').at(-1)?.textContent).toBe('显示文件位置（默认）')
+  expect(screen.queryByText('用默认应用打开')).toBeNull()
+  fireEvent.keyDown(screen.getByRole('menu'), { key: 'Escape' })
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.reveal'] })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
 })
 
 
 it('coalesces repeated gestures before the busy state renders', async () => {
   const pending = Promise.withResolvers<OpenInAppPathFailure | null>()
   const b = bench({ openPath: vi.fn(() => pending.promise) })
-  const { result } = renderHook(() => usePathGesture(b.props))
-  act(() => { result.current.act('open'); result.current.act('open') })
+  const { result } = renderHook(() => useOpenTargetGesture(() => b.openPath(ABSOLUTE_PATH, 'open'), t))
+  act(() => { result.current.act({ kind: 'default' }); result.current.act({ kind: 'default' }) })
   expect(b.openPath).toHaveBeenCalledOnce()
   await act(async () => { pending.resolve(null) })
   expect(result.current.pending).toBe(false)
diff --git a/scripts/no-unknown-casts.baseline.json b/scripts/no-unknown-casts.baseline.json
index 6f389f9866..154c57b993 100644
--- a/scripts/no-unknown-casts.baseline.json
+++ b/scripts/no-unknown-casts.baseline.json
@@ -628,10 +628,6 @@
     "eee35b4d8641824c6eaacfe03ed60d353d81d5257d1111132f34d46a7b13ef35": 2,
     "ff65b54ee69109a8b059fc2a2136c71a5476b47115120c7c92a01171d517f3d7": 1
   },
-  "packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx": {
-    "d6ca469f487b05b19564776f9a8f8288b1f0d9fb5b7fb6681e68f063fb021f38": 1,
-    "fdc0ec545dc17a50bdc1c64102915706cfbfdbb65a2165ae4691f29d577063cd": 1
-  },
   "packages/client/ui-permission-presets/tests/browser-plugin.client.spec.ts": {
     "dc36dd8f678695e3b84ce0573968470941c5b6fc5efe529cba17acb1f2799d1c": 1
   },
diff --git a/snapshots/web/document-preview/applications.expected.md b/snapshots/web/document-preview/applications.expected.md
index 9a6667e3e4..d70632d545 100644
--- a/snapshots/web/document-preview/applications.expected.md
+++ b/snapshots/web/document-preview/applications.expected.md
@@ -1,5 +1,4 @@
 - menu:
-  - menuitem "Open in default app"
   - menuitem "Test Player (default)"
   - menuitem "Other Player"
   - menuitem "Show file location"
diff --git a/snapshots/web/document-preview/document.expected.md b/snapshots/web/document-preview/document.expected.md
index e92c8cf01f..d6b251223d 100644
--- a/snapshots/web/document-preview/document.expected.md
+++ b/snapshots/web/document-preview/document.expected.md
@@ -81,5 +81,5 @@
 
 - State: unsupported
 - Line: Preview is not available for this file type yet.
-- Header control: Open
-- Empty-state control: Open in default app
+- Header control has no text: true
+- Empty-state control: Open

From 5c409c39bcd5bbcf3551ed5f52ecc7cea1454651 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:48:58 +0800
Subject: [PATCH 14/62] fix: type shared opening fixtures and document default
 actions

---
 packages/client/ui-open-in-app/README.i18n.yaml           | 4 ++--
 packages/client/ui-open-in-app/README.md                  | 8 ++++----
 packages/client/ui-open-in-app/README.zh.md               | 8 ++++----
 .../client/ui-open-in-app/src/client/OpenPathAction.tsx   | 2 +-
 .../tests/open-in-app-action.client.spec.tsx              | 8 +++-----
 .../ui-open-in-app/tests/open-path-action.client.spec.tsx | 2 +-
 6 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index cc15c6a7eb..e0ff0d0e57 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: a21a0b3bf3cc5dabe79dc2aa907640d66c8b25c5
-README.zh.md: cbbefaa2d619f591167f7b7775b2eb4c2c945ff1
+README.md: e38909417c715e6b953dfe54c24b85dda351045c
+README.zh.md: 301e9cf9bba736c9056a5df3cb59b320f998f500
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index a21a0b3bf3..e38909417c 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -29,11 +29,11 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 ### What to expect
 
-The main button shows the remembered application's icon — the real application icon wherever the host extracts one (macOS bundle icons, Windows executable icons, Linux theme icons), a generic glyph where it serves none — and a design-system tooltip ("Open locally"); clicking launches immediately. The chevron opens a dense menu of the installed applications with the remembered one marked by a filled row. Availability is read once per page from the host; the last chosen application persists in the browser (`dsh.open-in-app.choice`), and a choice that is no longer installed falls back to the first available entry. A launch that finishes quickly leaves the button untouched — the dimmed busy treatment appears only after 250 ms in flight — and a failed launch shows the error tooltip and a red outline for two seconds. All copy lives in the bilingual `open-in-app` locale namespace; an application id the dictionaries cannot name is not offered.
+The Session header and document header use the same 24px-high, icon-only split button with 9px corners. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
-In the document preview, the header's "Open ▾" split button opens the previewed file in the Host's default application from its main button, and its menu offers that action and "Show file location" (the file manager's reveal). A file the preview cannot render, whether an unsupported suffix such as video or an archive or a file the reader rejected as non-text or oversized, shows an "Open in default app" button in its empty state where Retry would otherwise stand. Both controls hand the Host the absolute path the file's metadata reports, appear only after the Host answered that a desktop is available, disable only while their own gesture settles, and announce a failed gesture once through a transient toast ("Could not open. Try again." or "Could not show the file location. Try again."); nothing stays on the control afterwards.
+File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file’s “Open” button uses the same default action.
 
-The document header shows the default application’s icon when available. Its menu lists the file’s OS-registered applications and marks the default. Choosing an application opens this file once; the main button continues to use the system default. Associations refresh when the file or menu visibility changes; cancelled queries cannot replace another file’s results. A failed query displays a menu message while default opening and reveal remain available. Platform coverage follows [native-command](../../util/native-command/README.md).
+File associations refresh when the file changes or its menu opens; cancelled queries cannot replace another file’s results. A failed query displays a menu message and leaves reveal available as the default action. File-association discovery follows [native-command](../../util/native-command/README.md); an empty result, including a platform without a discovery adapter, uses the same reveal fallback without platform branches in the control.
 
 -----
 
@@ -45,7 +45,7 @@ The document header shows the default application’s icon when available. Its m
 
 The plugin registers the split button on `conversation.session.header.utilities` through the standard slot/inject currency and registers the `open-in-app` dictionaries as one effect. A page-lifetime controller ([`src/client/controller.ts`](src/client/controller.ts)) owns the once-per-page availability read, the persisted choice snapshot store, and the launch POST; the component receives both stores through the inject `hooks` compartment, so every Session header shares one truth. Document-relative route forms and wire payload types come from the host package's browser-safe `@deepseek-ai/dsh-host-open-in-app/shared` subpath. In-flight launches are guarded by a ref — repeat clicks and menu picks during a launch are ignored whole (a pick would otherwise persist a choice the gesture never opened) — and the busy/error dress is timer-driven around the `launch` promise.
 
-The file controls register on the document preview's `sidebar.right.tab.document.actions` and `sidebar.right.tab.document.unpreviewable` child slots, whose owner props carry the file’s absolute execution-environment path. A second page-lifetime controller ([`src/client/open-path.ts`](src/client/open-path.ts)) reads the Session Remote's `session.canOpenWorkspacePath` once per page into a desktop snapshot store both controls share, and runs each gesture through `session.openWorkspacePath` with the path and, for reveal, `action: 'reveal'`; a refused or rejected call resolves as the failure kind the control announces. The controls share one gesture hook that owns the pending flag and the toast, so a gesture from one control never restyles the other. The node half is an empty `apply` that keeps the plugin on the host roster.
+The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while their native operations pass through [`open-path.ts`](src/client/open-path.ts) and the Session Remote. The directory adapter keeps the existing catalog routes. A failed or unavailable file query therefore needs no platform-specific UI implementation.
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index cbbefaa2d6..301e9cf9bb 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -29,11 +29,11 @@ kind: "package-reference"
 
 ### 预期行为
 
-主按钮显示记住的应用图标——凡主机能提取的都是应用真实图标（macOS bundle 图标、Windows 可执行文件图标、Linux 主题图标），提取不到时是通用占位图形——并带设计系统 tooltip（「在本地打开」）；点击立即启动。下拉箭头打开已安装应用的紧凑菜单，记住的条目以整行填充标记。可用性每页读取一次；上次选择的应用持久化在浏览器中（`dsh.open-in-app.choice`），不再安装的选择回退到第一个可用条目。快速完成的启动不改变按钮外观——变暗的等待态只在飞行超过 250 毫秒后出现——失败的启动显示错误 tooltip 与红色描边两秒。所有文案在双语 `open-in-app` locale 命名空间中；词典无法命名的应用 id 不会被提供。
+会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的纯图标分体按钮。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
-在文档预览里，头部的「打开 ▾」分体按钮的主按钮用 Host 默认应用打开当前文件，菜单提供同一动作和「显示文件位置」（文件管理器的定位）。预览无法渲染的文件，无论是视频、压缩包这类不支持的后缀，还是被读取器判为非文本或过大的文件，都会在空态里原本放重试的位置显示「用默认应用打开」按钮。两个控件都把文件元数据报出的绝对路径交给 Host，只在 Host 回答有桌面之后出现，只在自己的手势结算期间禁用，失败时通过短暂 toast 提示一次（「打开失败，请重试」或「无法显示文件位置，请重试」），之后控件上不残留任何状态。
+文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态中的“打开”按钮也使用相同的默认动作。
 
-文档标题栏在可用时显示默认应用图标。菜单列出系统为该文件注册的应用，并标记默认项。选择应用只用于本次打开，主按钮始终使用系统默认应用。文件或菜单显示状态变化时会重新查询关联应用；已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，默认打开和定位仍可使用。平台支持范围见 [native-command](../../util/native-command/README.zh.md)。
+文件变化或打开菜单时会重新查询文件关联；已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，并以文件定位作为默认动作。文件关联查询的平台支持范围见 [native-command](../../util/native-command/README.zh.md)；查询结果为空时，包括平台尚无查询适配器的情况，控件统一使用定位动作，不按操作系统分支处理。
 
 -----
 
@@ -45,7 +45,7 @@ kind: "package-reference"
 
 插件通过标准 slot/inject 机制把分体按钮注册到 `conversation.session.header.utilities`，并以一个 effect 注册 `open-in-app` 词典。一个页面生命周期的 controller（[`src/client/controller.ts`](src/client/controller.ts)）拥有每页一次的可用性读取、持久化选择的 snapshot store 与启动 POST；组件经 inject 的 `hooks` 隔间接收两个 store，因此所有会话头部共享同一份事实。文档相对的路由形式与 wire 载荷类型来自主机包的浏览器安全子路径 `@deepseek-ai/dsh-host-open-in-app/shared`。飞行中的启动由 ref 守卫——启动期间的重复点击与菜单选择被整体忽略（否则会持久化一个该手势从未打开的选择）——busy/error 视觉由围绕 `launch` promise 的定时器驱动。
 
-文件控件注册在文档预览的 `sidebar.right.tab.document.actions` 与 `sidebar.right.tab.document.unpreviewable` 子 slot 上，owner props 携带文件在执行环境中的绝对路径。第二个页面生命周期的 controller（[`src/client/open-path.ts`](src/client/open-path.ts)）每页读取一次 Session Remote 的 `session.canOpenWorkspacePath`，写进两个控件共用的桌面 snapshot store，并把每个手势交给 `session.openWorkspacePath`，带上路径，定位时再带 `action: 'reveal'`；被拒绝或抛错的调用解析为控件要提示的失败种类。两个控件共用一个手势 hook，由它持有 pending 标志和 toast，所以一个控件的手势不会改变另一个控件的样子。节点半边是一个空 `apply`，让插件出现在主机侧的插件名册上。
+目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，原生操作通过 [`open-path.ts`](src/client/open-path.ts) 与 Session Remote 执行。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index 317f392740..d6c7da7f7a 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -58,7 +58,7 @@ export function FileOpenTarget(props: FileOpenTargetProps): ReactNode {
   return (
     <OpenTargetButton
       key={props.absolutePath} kind="file" applications={apps ?? []} defaultId={apps?.find(app => app.default)?.id}
-      failed={association?.path === props.absolutePath && apps === null} empty={props.empty} t={props.t}
+      failed={association?.path === props.absolutePath && apps === null} empty={props.empty === true} t={props.t}
       refresh={() => { setRevision(value => value + 1) }}
       execute={operation => props.openPath(props.absolutePath, operation.kind === 'reveal' ? 'reveal' : 'open',
         operation.kind === 'application' ? operation.id : undefined)}
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 0116963d6e..1611bff570 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -29,15 +29,13 @@ function bench(over: {
   cwd?: string
   launch?: (appId: string, path: string) => Promise<void>
 } = {}): Bench {
-  const state = {
+  const state: SessionListState = {
     ids: [SESSION],
-    byId: over.cwd === undefined ? {} : { [SESSION]: { cwd: over.cwd } },
-    current: SESSION,
+    byId: over.cwd === undefined ? {} : { [SESSION]: { id: SESSION, displayTitle: 'Workspace', cwd: over.cwd, running: false, retainedBy: {}, blank: false, updatedAt: 0 } },
     phase: 'ready',
     projectionsBySession: {},
     jobsBySession: {},
-    currentAddress: undefined,
-  } as SessionListState
+  }
   const apps = createSnapshotStore<readonly string[] | null>(over.apps ?? null)
   const choice = createSnapshotStore<string>(over.choice ?? '')
   const launch = vi.fn(over.launch ?? (async () => {}))
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 961b066a3a..6fc0b23be2 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -195,7 +195,7 @@ it('keeps reveal last and makes it the default when the file query fails', async
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
 })
 
-it.each([[], [{ id: '/Player.app', name: 'Player', default: false, icon: null }]])('uses reveal as the default after the available applications when none is default', async (apps) => {
+it.each([{ apps: [] }, { apps: [{ id: '/Player.app', name: 'Player', default: false, icon: null }] }])('uses reveal as the default after the available applications when none is default', async ({ apps }) => {
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => apps} />)
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })

From 6111f879fd9a7fe9354f86fc846f00997269517c Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:50:40 +0800
Subject: [PATCH 15/62] test: verify shared opener menu toggling and SSH
 visibility

---
 apps/web/tests/open-in-app-ssh.e2e.ts              |  3 +--
 .../ui-open-in-app/src/client/OpenTargetButton.tsx |  2 +-
 .../tests/open-path-action.client.spec.tsx         | 14 ++++++++++++++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/apps/web/tests/open-in-app-ssh.e2e.ts b/apps/web/tests/open-in-app-ssh.e2e.ts
index 7323495984..ff57285d88 100644
--- a/apps/web/tests/open-in-app-ssh.e2e.ts
+++ b/apps/web/tests/open-in-app-ssh.e2e.ts
@@ -60,8 +60,7 @@ describe.skipIf(MODE === 'record')('web e2e: Open In under SSH', () => {
     ])
     expect(response.status()).toBe(200)
     expect(await response.json()).toEqual({ apps: [] })
-    expect(await page.getByRole('button', { name: /^Open workspace in / }).count()).toBe(0)
-    expect(await page.getByRole('button', { name: 'Choose an app to open in', exact: true }).count()).toBe(0)
+    expect(await page.locator('[data-open-target="directory"]').count()).toBe(0)
     expect(await page.evaluate(() => localStorage.getItem('dsh.open-in-app.choice'))).toBe('"vscode"')
     const snapshot = (await captureStableAria(page, 'role=banner', scaffold.workspaceCwd))
       .split(SEED_ID).join('{{seededId}}')
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 570e8f4914..b96675d8ae 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -79,7 +79,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
   const { pending, toast, act } = useOpenTargetGesture(props.execute, t)
   const preferred = applications.find(app => app.id === defaultId)
   const revealDefault = kind === 'file' && preferred === undefined
-  const primaryLabel = revealDefault ? t('path.reveal') : t('open.title', { app: preferred?.name ?? '' })
+  const primaryLabel = preferred === undefined ? t('path.reveal') : t('open.title', { app: preferred.name })
   const run = (operation: OpenTargetOperation): void => { setMenuOpen(false); act(operation) }
   const primary = (): void => { run({ kind: revealDefault ? 'reveal' : 'default' }) }
   const icon = revealDefault
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 6fc0b23be2..15df920d7c 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -216,3 +216,17 @@ it('coalesces repeated gestures before the busy state renders', async () => {
   await act(async () => { pending.resolve(null) })
   expect(result.current.pending).toBe(false)
 })
+
+
+it('closes the application menu from its chevron without querying again', async () => {
+  const b = bench()
+  render(<OpenPathAction {...b.props} />)
+  await act(async () => {})
+  const more = screen.getByRole('button', { name: zh['path.more'] })
+  await act(async () => { fireEvent.click(more) })
+  expect(screen.getByRole('menu')).toBeTruthy()
+  const calls = vi.mocked(b.props.applications).mock.calls.length
+  await act(async () => { fireEvent.click(more) })
+  expect(screen.queryByRole('menu')).toBeNull()
+  expect(b.props.applications).toHaveBeenCalledTimes(calls)
+})

From 71b7bbeb88a1916b9a27018d53ac9d0067e6989f Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 11:55:48 +0800
Subject: [PATCH 16/62] fix: wait for file associations before enabling the
 default action

---
 .../src/client/OpenPathAction.tsx               |  3 ++-
 .../src/client/OpenTargetButton.tsx             | 14 ++++++++------
 .../tests/open-path-action.client.spec.tsx      | 17 +++++++++++++++++
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index d6c7da7f7a..d7bf5aca23 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -58,7 +58,8 @@ export function FileOpenTarget(props: FileOpenTargetProps): ReactNode {
   return (
     <OpenTargetButton
       key={props.absolutePath} kind="file" applications={apps ?? []} defaultId={apps?.find(app => app.default)?.id}
-      failed={association?.path === props.absolutePath && apps === null} empty={props.empty === true} t={props.t}
+      loading={association?.path !== props.absolutePath} failed={association?.path === props.absolutePath && apps === null}
+      empty={props.empty === true} t={props.t}
       refresh={() => { setRevision(value => value + 1) }}
       execute={operation => props.openPath(props.absolutePath, operation.kind === 'reveal' ? 'reveal' : 'open',
         operation.kind === 'application' ? operation.id : undefined)}
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index b96675d8ae..207fee182f 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -26,6 +26,7 @@ export interface OpenTargetButtonProps {
   readonly applications: readonly OpenTargetApplication[]
   readonly defaultId: string | undefined
   readonly failed: boolean
+  readonly loading?: boolean
   readonly empty?: boolean
   readonly t: TranslateNS<typeof NS>
   readonly execute: (operation: OpenTargetOperation) => Promise<OpenInAppPathFailure | null>
@@ -78,6 +79,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
   const [menuOpen, setMenuOpen] = useState(false)
   const { pending, toast, act } = useOpenTargetGesture(props.execute, t)
   const preferred = applications.find(app => app.id === defaultId)
+  const disabled = pending || props.loading === true
   const revealDefault = kind === 'file' && preferred === undefined
   const primaryLabel = preferred === undefined ? t('path.reveal') : t('open.title', { app: preferred.name })
   const run = (operation: OpenTargetOperation): void => { setMenuOpen(false); act(operation) }
@@ -87,7 +89,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
     : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={13} />
   if (props.empty === true) return (
     <>
-      <button type="button" className={css.empty} disabled={pending} data-open-path-unpreviewable onClick={primary}>
+      <button type="button" className={css.empty} disabled={disabled} data-open-path-unpreviewable onClick={primary}>
         {t('path.open')}{icon}
       </button>
       {toast}
@@ -97,7 +99,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
     <>
       <Menu
         className={css.menuAnchor}
-        open={menuOpen && !pending}
+        open={menuOpen && !disabled}
         autoFocus
         portal
         dense
@@ -117,15 +119,15 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         ]}
         onSelect={(id) => { run(id === 'reveal' ? { kind: 'reveal' } : { kind: 'application', id: id.slice(4) }) }}
         anchor={(
-          <div className={css.split} data-open-target={kind} data-open-path={kind === 'file' ? '' : undefined} data-state={pending ? 'busy' : 'idle'}>
+          <div className={css.split} data-open-target={kind} data-open-path={kind === 'file' ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
             <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
-              <button type="button" className={css.main} disabled={pending} aria-label={primaryLabel} data-open-path-open={kind === 'file' ? '' : undefined} onClick={primary}>
+              <button type="button" className={css.main} disabled={disabled} aria-label={primaryLabel} data-open-path-open={kind === 'file' ? '' : undefined} onClick={primary}>
                 {icon}
               </button>
             </Tooltip>
             <button
-              type="button" className={css.chevron} disabled={pending}
-              aria-haspopup="menu" aria-expanded={menuOpen && !pending} aria-label={t('path.more')}
+              type="button" className={css.chevron} disabled={disabled}
+              aria-haspopup="menu" aria-expanded={menuOpen && !disabled} aria-label={t('path.more')}
               data-open-path-more={kind === 'file' ? '' : undefined}
               onClick={() => {
                 if (!menuOpen) props.refresh?.()
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 15df920d7c..6f3f9b474d 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -187,6 +187,7 @@ it('ignores an obsolete file query and refreshes the default application when th
 it('keeps reveal last and makes it the default when the file query fails', async () => {
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => null} />)
+  await act(async () => {})
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
   const items = screen.getAllByRole('menuitem')
   expect(items.map(item => item.textContent)).toEqual([zh['path.appsError'], '显示文件位置（默认）'])
@@ -198,6 +199,7 @@ it('keeps reveal last and makes it the default when the file query fails', async
 it.each([{ apps: [] }, { apps: [{ id: '/Player.app', name: 'Player', default: false, icon: null }] }])('uses reveal as the default after the available applications when none is default', async ({ apps }) => {
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => apps} />)
+  await act(async () => {})
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
   expect(screen.getAllByRole('menuitem').at(-1)?.textContent).toBe('显示文件位置（默认）')
   expect(screen.queryByText('用默认应用打开')).toBeNull()
@@ -230,3 +232,18 @@ it('closes the application menu from its chevron without querying again', async
   expect(screen.queryByRole('menu')).toBeNull()
   expect(b.props.applications).toHaveBeenCalledTimes(calls)
 })
+
+
+it('waits for the file association query before allowing a default action', async () => {
+  const b = bench()
+  const query = Promise.withResolvers<Awaited<ReturnType<OpenPathActionProps['applications']>>>()
+  const view = render(<OpenPathAction {...b.props} applications={() => query.promise} />)
+  const main = view.container.querySelector('[data-open-path-open]')!
+  expect(main).toHaveProperty('disabled', true)
+  fireEvent.click(main)
+  expect(b.openPath).not.toHaveBeenCalled()
+  await act(async () => { query.resolve([]) })
+  expect(main).toHaveProperty('disabled', false)
+  await act(async () => { fireEvent.click(main) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
+})

From 219bbe47c7e22cac3c6793af6a878e1b0cb43de3 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:00:03 +0800
Subject: [PATCH 17/62] feat: reuse the opening menu in a larger preview action

---
 apps/web/tests/document-preview.e2e.ts        |  7 ++--
 .../client/ui-open-in-app/README.i18n.yaml    |  4 +--
 packages/client/ui-open-in-app/README.md      |  2 +-
 packages/client/ui-open-in-app/README.zh.md   |  2 +-
 .../src/client/OpenPathAction.tsx             |  2 +-
 .../src/client/OpenPathEmptyAction.tsx        |  2 +-
 .../src/client/OpenTargetButton.module.css    | 34 +++++++------------
 .../src/client/OpenTargetButton.tsx           | 27 ++++++---------
 .../tests/open-path-action.client.spec.tsx    | 20 +++++++++++
 .../web/document-preview/document.expected.md |  2 +-
 10 files changed, 55 insertions(+), 47 deletions(-)

diff --git a/apps/web/tests/document-preview.e2e.ts b/apps/web/tests/document-preview.e2e.ts
index 171115a18b..8858a9011c 100644
--- a/apps/web/tests/document-preview.e2e.ts
+++ b/apps/web/tests/document-preview.e2e.ts
@@ -743,13 +743,16 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
     await headerOpen.waitFor({ timeout: 15_000 })
     const emptyOpen = unsupported.locator('[data-textpreview-unsupported] [data-open-path-unpreviewable]')
     await emptyOpen.waitFor({ timeout: 15_000 })
+    const prominent = unsupported.locator('[data-open-target="file"][data-size="large"]')
+    expect((await prominent.boundingBox())?.height).toBe(40)
+    expect((await unsupported.locator('[data-open-path]').boundingBox())?.height).toBe(24)
     await successShot(page, 'unsupported')
     sections.push([
       '## Unviewable binary', '',
       '- State: unsupported',
       `- Line: ${unsupportedLine.trim()}`,
       `- Header control has no text: ${String(await headerOpen.innerText() === '')}`,
-      `- Empty-state control: ${await emptyOpen.innerText()}`,
+      `- Empty-state control has text: ${String((await emptyOpen.innerText()).length > 0)}`,
     ].join('\n'))
     if (STUB_OPENER) {
       // Real Host gestures against the stubbed opener: default application from the empty state, reveal from the header menu.
@@ -766,7 +769,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
       expect([clip, cwd]).toContain(gestures[1]?.path)
       if (process.platform === 'darwin') {
         await expect.poll(() => headerOpen.locator('img').count()).toBe(1)
-        await unsupported.locator('[data-open-path-more]').click()
+        await prominent.getByRole('button', { name: 'More ways to open' }).click()
         await page.getByRole('menuitem', { name: 'Test Player (default)', exact: true }).waitFor()
         await compareOrRefreshGolden(join(SNAPSHOT_DIR, 'applications.expected.md'), await page.getByRole('menu').ariaSnapshot(), MODE)
         await page.getByRole('menuitem', { name: 'Other Player', exact: true }).click()
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index e0ff0d0e57..40f6d2006d 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: e38909417c715e6b953dfe54c24b85dda351045c
-README.zh.md: 301e9cf9bba736c9056a5df3cb59b320f998f500
+README.md: e59377e315e0959cdb741cad91a04ae769586c89
+README.zh.md: 72461b43a8b520d8b7c008aedeb310ed9e1998d5
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index e38909417c..e59377e315 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -31,7 +31,7 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 The Session header and document header use the same 24px-high, icon-only split button with 9px corners. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
-File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file’s “Open” button uses the same default action.
+File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
 
 File associations refresh when the file changes or its menu opens; cancelled queries cannot replace another file’s results. A failed query displays a menu message and leaves reveal available as the default action. File-association discovery follows [native-command](../../util/native-command/README.md); an empty result, including a platform without a discovery adapter, uses the same reveal fallback without platform branches in the control.
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 301e9cf9bb..72461b43a8 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -31,7 +31,7 @@ kind: "package-reference"
 
 会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的纯图标分体按钮。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
-文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态中的“打开”按钮也使用相同的默认动作。
+文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
 
 文件变化或打开菜单时会重新查询文件关联；已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，并以文件定位作为默认动作。文件关联查询的平台支持范围见 [native-command](../../util/native-command/README.zh.md)；查询结果为空时，包括平台尚无查询适配器的情况，控件统一使用定位动作，不按操作系统分支处理。
 
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index d7bf5aca23..869aa8e041 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -59,7 +59,7 @@ export function FileOpenTarget(props: FileOpenTargetProps): ReactNode {
     <OpenTargetButton
       key={props.absolutePath} kind="file" applications={apps ?? []} defaultId={apps?.find(app => app.default)?.id}
       loading={association?.path !== props.absolutePath} failed={association?.path === props.absolutePath && apps === null}
-      empty={props.empty === true} t={props.t}
+      prominent={props.empty === true} t={props.t}
       refresh={() => { setRevision(value => value + 1) }}
       execute={operation => props.openPath(props.absolutePath, operation.kind === 'reveal' ? 'reveal' : 'open',
         operation.kind === 'application' ? operation.id : undefined)}
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
index 8294a7ab19..05a2b66800 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathEmptyAction.tsx
@@ -12,7 +12,7 @@ export type OpenPathEmptyActionProps =
   & InjectFace<OpenPathInjected>
 
 /**
- * Render the same file default action without a dropdown.
+ * Render the shared file opening menu with a larger labeled main button.
  * @param props - unpreviewable file and injected opening capabilities.
  * @returns the shared file opening action.
  */
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
index 66a890bfa2..89089a8c2a 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
@@ -60,29 +60,19 @@
   object-fit: contain;
 }
 
-/* The empty state's capsule, sized like the preview's own Retry
-   (ui-sidebar-documentpreview TextPreview `.retry`) so the two recourses read
-   as one family. */
-.empty {
-  display: inline-flex;
-  flex: none;
+/* The unavailable preview emphasizes the same actions with a labeled button. */
+.split[data-size='large'] {
+  height: 40px;
+  border-radius: 14px;
+  border-color: var(--dsw-alias-border-l2);
+}
+
+.split[data-size='large'] .main {
   gap: 6px;
-  align-items: center;
-  height: 32px;
-  padding: 0 12px 0 14px;
-  color: var(--dsw-alias-label-primary);
-  font-size: var(--dsh-content-font-size-secondary, 13px);
-  font-family: inherit;
-  background: transparent;
-  border: 0.5px solid var(--dsw-alias-border-l2);
-  border-radius: 16px;
-  cursor: pointer;
+  padding: 8px 14px;
+  font-size: 14px;
 }
 
-.empty:hover:not(:disabled) {
-  background: var(--dsw-alias-interactive-bg-hover);
-}
-
-.empty:disabled {
-  cursor: default;
+.split[data-size='large'] .chevron {
+  padding: 8px 10px;
 }
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 207fee182f..68b1bd4909 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -27,7 +27,7 @@ export interface OpenTargetButtonProps {
   readonly defaultId: string | undefined
   readonly failed: boolean
   readonly loading?: boolean
-  readonly empty?: boolean
+  readonly prominent?: boolean
   readonly t: TranslateNS<typeof NS>
   readonly execute: (operation: OpenTargetOperation) => Promise<OpenInAppPathFailure | null>
   readonly refresh?: () => void
@@ -80,21 +80,13 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
   const { pending, toast, act } = useOpenTargetGesture(props.execute, t)
   const preferred = applications.find(app => app.id === defaultId)
   const disabled = pending || props.loading === true
-  const revealDefault = kind === 'file' && preferred === undefined
+  const revealDefault = kind === 'file' && preferred === undefined && props.loading !== true
   const primaryLabel = preferred === undefined ? t('path.reveal') : t('open.title', { app: preferred.name })
   const run = (operation: OpenTargetOperation): void => { setMenuOpen(false); act(operation) }
   const primary = (): void => { run({ kind: revealDefault ? 'reveal' : 'default' }) }
   const icon = revealDefault
-    ? <IconFolderOpenOutlineRegular size={13} />
-    : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={13} />
-  if (props.empty === true) return (
-    <>
-      <button type="button" className={css.empty} disabled={disabled} data-open-path-unpreviewable onClick={primary}>
-        {t('path.open')}{icon}
-      </button>
-      {toast}
-    </>
-  )
+    ? <IconFolderOpenOutlineRegular size={props.prominent ? 18 : 13} />
+    : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={props.prominent ? 18 : 13} />
   return (
     <>
       <Menu
@@ -119,16 +111,19 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         ]}
         onSelect={(id) => { run(id === 'reveal' ? { kind: 'reveal' } : { kind: 'application', id: id.slice(4) }) }}
         anchor={(
-          <div className={css.split} data-open-target={kind} data-open-path={kind === 'file' ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
+          <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
+            data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
             <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
-              <button type="button" className={css.main} disabled={disabled} aria-label={primaryLabel} data-open-path-open={kind === 'file' ? '' : undefined} onClick={primary}>
-                {icon}
+              <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
+                data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
+                data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
+                {icon}{props.prominent && (revealDefault ? t('path.reveal') : t('path.open'))}
               </button>
             </Tooltip>
             <button
               type="button" className={css.chevron} disabled={disabled}
               aria-haspopup="menu" aria-expanded={menuOpen && !disabled} aria-label={t('path.more')}
-              data-open-path-more={kind === 'file' ? '' : undefined}
+              data-open-path-more={kind === 'file' && !props.prominent ? '' : undefined}
               onClick={() => {
                 if (!menuOpen) props.refresh?.()
                 setMenuOpen(value => !value)
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 6f3f9b474d..1e20e3a7b1 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -247,3 +247,23 @@ it('waits for the file association query before allowing a default action', asyn
   await act(async () => { fireEvent.click(main) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
 })
+
+
+it('uses the same application menu in the prominent empty-state control', async () => {
+  const b = bench()
+  const view = render(<OpenPathEmptyAction {...b.props} />)
+  await act(async () => {})
+  expect(view.container.querySelector('[data-open-target]')?.getAttribute('data-size')).toBe('large')
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  expect(screen.getAllByRole('menuitem').map(item => item.textContent)).toEqual(['Music（默认）', zh['path.reveal']])
+  await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Music（默认）' })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'open', '/Music.app')
+})
+
+it('labels the prominent default action as reveal when no default application is discovered', async () => {
+  const b = bench()
+  render(<OpenPathEmptyAction {...b.props} applications={async () => []} />)
+  await act(async () => {})
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.reveal'] })) })
+  expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
+})
diff --git a/snapshots/web/document-preview/document.expected.md b/snapshots/web/document-preview/document.expected.md
index d6b251223d..3a9c050547 100644
--- a/snapshots/web/document-preview/document.expected.md
+++ b/snapshots/web/document-preview/document.expected.md
@@ -82,4 +82,4 @@
 - State: unsupported
 - Line: Preview is not available for this file type yet.
 - Header control has no text: true
-- Empty-state control: Open
+- Empty-state control has text: true

From a1545a9bf55a09fcb4069877479a675ce914cfe4 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:10:54 +0800
Subject: [PATCH 18/62] feat: share file associations across macOS Windows and
 Linux

---
 .../src/client/OpenInAppAction.tsx            |   2 +-
 .../src/client/OpenTargetButton.tsx           |   5 +-
 .../tests/open-in-app-action.client.spec.tsx  |   8 +-
 packages/host/open-in-app/src/icons.ts        |  52 +-----
 packages/host/open-in-app/src/resolver.ts     |  28 +--
 .../util/native-command/src/desktop-entry.ts  |  76 ++++++++
 .../src/file-applications-linux.ts            |  66 +++++++
 .../src/file-applications-windows.ts          | 167 ++++++++++++++++++
 .../native-command/src/file-applications.ts   |  41 ++++-
 packages/util/native-command/src/index.ts     |   2 +
 packages/util/native-command/src/types.ts     |   2 +-
 .../tests/file-applications.spec.ts           |  28 ++-
 12 files changed, 393 insertions(+), 84 deletions(-)
 create mode 100644 packages/util/native-command/src/desktop-entry.ts
 create mode 100644 packages/util/native-command/src/file-applications-linux.ts
 create mode 100644 packages/util/native-command/src/file-applications-windows.ts

diff --git a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
index a58ed63933..f4b4c03bd4 100644
--- a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
@@ -81,7 +81,7 @@ export function OpenInAppAction(props: OpenInAppActionProps): React.JSX.Element
   if (preferred === undefined || cwd === undefined || cwd === '') return null
   return (
     <OpenTargetButton
-      key={cwd} kind="directory" applications={apps} defaultId={preferred.id} failed={false} t={t}
+      key={cwd} kind="directory" showLabel applications={apps} defaultId={preferred.id} failed={false} t={t}
       execute={async (operation) => {
         const id = operation.kind === 'application' ? operation.id : preferred.id
         try {
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 68b1bd4909..3377d71039 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -28,6 +28,7 @@ export interface OpenTargetButtonProps {
   readonly failed: boolean
   readonly loading?: boolean
   readonly prominent?: boolean
+  readonly showLabel?: boolean
   readonly t: TranslateNS<typeof NS>
   readonly execute: (operation: OpenTargetOperation) => Promise<OpenInAppPathFailure | null>
   readonly refresh?: () => void
@@ -114,10 +115,10 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
             data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
             <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
-              <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
+              <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent || props.showLabel ? undefined : primaryLabel}
                 data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
                 data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
-                {icon}{props.prominent && (revealDefault ? t('path.reveal') : t('path.open'))}
+                {icon}{(props.prominent || props.showLabel) && (revealDefault ? t('path.reveal') : t('path.open'))}
               </button>
             </Tooltip>
             <button
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 1611bff570..2152a47d05 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -77,11 +77,11 @@ describe('OpenInAppAction visibility', () => {
 
   it('shows the remembered choice, falling back to the first available app when it is gone', () => {
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'cursor', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['open.title'].replace('{app}', 'Cursor') })).toBeDefined()
+    expect(screen.getByRole('button', { name: zh['path.open'] })).toBeDefined()
     cleanup()
 
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'vscode', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['open.title'].replace('{app}', zh['app.finder']) })).toBeDefined()
+    expect(screen.getByRole('button', { name: zh['path.open'] })).toBeDefined()
   })
 })
 
@@ -90,7 +90,7 @@ describe('OpenInAppAction launching', () => {
     const pending = Promise.withResolvers<undefined>()
     const b = bench({ apps: ['finder', 'cursor'], cwd: '/w/dir', launch: () => pending.promise })
     const view = render(<OpenInAppAction {...b.props} />)
-    const main = screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) })
+    const main = screen.getByRole('button', { name: zh['path.open'] })
     fireEvent.click(main)
     expect(main).toHaveProperty('disabled', true)
     expect(screen.getByRole('button', { name: zh['path.more'] })).toHaveProperty('disabled', true)
@@ -136,7 +136,7 @@ describe('OpenInAppAction launching', () => {
 
   it('uses the shared product tooltip', async () => {
     render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w' }).props} />)
-    fireEvent.mouseEnter(screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) }))
+    fireEvent.mouseEnter(screen.getByRole('button', { name: zh['path.open'] }))
     expect(await screen.findByText(zh['open.tooltip'])).toBeTruthy()
   })
 })
diff --git a/packages/host/open-in-app/src/icons.ts b/packages/host/open-in-app/src/icons.ts
index 6908ce795b..4b07441c8c 100644
--- a/packages/host/open-in-app/src/icons.ts
+++ b/packages/host/open-in-app/src/icons.ts
@@ -11,10 +11,11 @@
 
 import { mkdtemp, readdir, readFile, rm, stat, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
-import { isAbsolute, join } from 'node:path'
+import { join } from 'node:path'
+import { desktopApplicationIcon } from '@deepseek-ai/dsh-native-command'
 import type { OpenInAppApp } from './catalog.ts'
 import {
-  findDesktopEntry, isFile, output, resolveInternals, specFor, xdgDataDirectories,
+  findDesktopEntry, output, resolveInternals, specFor, xdgDataDirectories,
   type OpenInAppInternals, type OpenInAppResolvedLaunch, type ResolvedInternals,
 } from './resolver.ts'
 
@@ -121,50 +122,6 @@ async function extractExecutableIconPng(
   }
 }
 
-/** Theme sizes searched largest-first; the button renders at 15-18 CSS px. */
-const HICOLOR_SIZES = ['512x512', '256x256', '128x128', '64x64', '48x48', '32x32'] as const
-
-/** The media type an icon file's extension names. */
-function iconContentType(path: string): OpenInAppIcon['contentType'] | null {
-  if (path.endsWith('.png')) return 'image/png'
-  if (path.endsWith('.svg')) return 'image/svg+xml'
-  return null
-}
-
-/** Read one icon file when it exists and carries a servable media type. */
-async function readIconFile(path: string): Promise<OpenInAppIcon | null> {
-  const contentType = iconContentType(path)
-  if (contentType === null || !await isFile(path)) return null
-  return { bytes: await readFile(path), contentType }
-}
-
-/**
- * Resolve a Linux icon name through the hicolor theme and pixmaps
- * directories, largest size first. The user's active icon theme is not
- * consulted (README Known Limitations): hicolor is the freedesktop fallback
- * every theme inherits from, so the stock icon is found wherever the
- * application installed one.
- */
-async function findLinuxThemeIcon(
-  name: string, dataDirs: readonly string[],
-): Promise<OpenInAppIcon | null> {
-  for (const dataDir of dataDirs) {
-    for (const size of HICOLOR_SIZES) {
-      for (const extension of ['png', 'svg'] as const) {
-        const icon = await readIconFile(join(dataDir, 'icons', 'hicolor', size, 'apps', `${name}.${extension}`))
-        if (icon !== null) return icon
-      }
-    }
-    const scalable = await readIconFile(join(dataDir, 'icons', 'hicolor', 'scalable', 'apps', `${name}.svg`))
-    if (scalable !== null) return scalable
-    for (const extension of ['png', 'svg'] as const) {
-      const pixmap = await readIconFile(join(dataDir, 'pixmaps', `${name}.${extension}`))
-      if (pixmap !== null) return pixmap
-    }
-  }
-  return null
-}
-
 /** One Linux application's icon from its desktop entry's `Icon=` key. */
 async function extractLinuxIcon(
   desktopId: string, internals: ResolvedInternals,
@@ -172,8 +129,7 @@ async function extractLinuxIcon(
   const entry = await findDesktopEntry(desktopId, internals)
   const icon = entry?.icon
   if (icon === undefined || icon === '') return null
-  if (isAbsolute(icon)) return readIconFile(icon)
-  return findLinuxThemeIcon(icon, xdgDataDirectories(internals))
+  return desktopApplicationIcon(icon, xdgDataDirectories(internals))
 }
 
 /**
diff --git a/packages/host/open-in-app/src/resolver.ts b/packages/host/open-in-app/src/resolver.ts
index 7ab964b4fd..62c6f8e4bc 100644
--- a/packages/host/open-in-app/src/resolver.ts
+++ b/packages/host/open-in-app/src/resolver.ts
@@ -17,7 +17,7 @@ import { readdir, readFile, stat } from 'node:fs/promises'
 import { homedir, platform as osPlatform } from 'node:os'
 import { dirname, isAbsolute, join } from 'node:path'
 import {
-  canOpenNativePath, openNativePath, runNativeCommand, type NativeCommandRunner,
+  canOpenNativePath, openNativePath, runNativeCommand, desktopEntryFields, desktopDataDirectories, type NativeCommandRunner,
 } from '@deepseek-ai/dsh-native-command'
 import { scrubbedParentEnv } from '@deepseek-ai/dsh-subprocess'
 import {
@@ -379,24 +379,12 @@ export interface DesktopEntry {
  * @returns the recognized fields; keys outside the entry section are ignored.
  */
 export function parseDesktopEntry(text: string): DesktopEntry {
-  let inEntry = false
-  const fields: { exec?: string; tryExec?: string; icon?: string } = {}
-  for (const line of text.split(/\r?\n/)) {
-    const trimmed = line.trim()
-    if (trimmed.startsWith('[')) {
-      inEntry = trimmed === '[Desktop Entry]'
-      continue
-    }
-    if (!inEntry) continue
-    const separator = trimmed.indexOf('=')
-    if (separator < 0) continue
-    const key = trimmed.slice(0, separator).trim()
-    const value = trimmed.slice(separator + 1).trim()
-    if (key === 'Exec') fields.exec = value
-    else if (key === 'TryExec') fields.tryExec = value
-    else if (key === 'Icon') fields.icon = value
+  const fields = desktopEntryFields(text)
+  return {
+    ...(fields.Exec === undefined ? {} : { exec: fields.Exec }),
+    ...(fields.TryExec === undefined ? {} : { tryExec: fields.TryExec }),
+    ...(fields.Icon === undefined ? {} : { icon: fields.Icon }),
   }
-  return fields
 }
 
 /**
@@ -405,9 +393,7 @@ export function parseDesktopEntry(text: string): DesktopEntry {
  * @returns the data directories, freedesktop defaults applied.
  */
 export function xdgDataDirectories(internals: ResolvedInternals): readonly string[] {
-  const dataHome = internals.env['XDG_DATA_HOME'] ?? join(internals.home, '.local', 'share')
-  const dataDirs = internals.env['XDG_DATA_DIRS'] ?? '/usr/local/share:/usr/share'
-  return [dataHome, ...dataDirs.split(':').filter(dir => dir !== '')]
+  return desktopDataDirectories(internals.home, internals.env)
 }
 
 /**
diff --git a/packages/util/native-command/src/desktop-entry.ts b/packages/util/native-command/src/desktop-entry.ts
new file mode 100644
index 0000000000..b2589aabb4
--- /dev/null
+++ b/packages/util/native-command/src/desktop-entry.ts
@@ -0,0 +1,76 @@
+/** Shared XDG desktop-entry fields and icon lookup for directory and file application catalogs. */
+import { readFile, stat } from 'node:fs/promises'
+import { isAbsolute, join } from 'node:path'
+
+/** Decoded application icon bytes suitable for an image response or data URL. */
+export interface DesktopIcon {
+  readonly bytes: Buffer
+  readonly contentType: 'image/png' | 'image/svg+xml'
+}
+
+/**
+ * Read the main desktop-entry section without interpreting executable commands.
+ * @param text - installed desktop-entry text.
+ * @returns its literal field values; action sections are excluded.
+ */
+export function desktopEntryFields(text: string): Readonly<Record<string, string>> {
+  let main = false
+  const fields = new Map<string, string>()
+  for (const line of text.split(/\r?\n/)) {
+    const trimmed = line.trim()
+    if (trimmed.startsWith('[')) { main = trimmed === '[Desktop Entry]'; continue }
+    if (!main || trimmed.startsWith('#')) continue
+    const separator = trimmed.indexOf('=')
+    if (separator > 0) fields.set(trimmed.slice(0, separator).trim(), trimmed.slice(separator + 1).trim())
+  }
+  return Object.fromEntries(fields)
+}
+
+/**
+ * Resolve XDG application and icon roots in desktop precedence order.
+ * @param home - user's home directory.
+ * @param env - desktop environment values.
+ * @returns data-home followed by system data directories.
+ */
+export function desktopDataDirectories(home: string, env: Readonly<Record<string, string | undefined>>): readonly string[] {
+  return [env.XDG_DATA_HOME ?? join(home, '.local', 'share'),
+    ...(env.XDG_DATA_DIRS ?? '/usr/local/share:/usr/share').split(':').filter(Boolean)]
+}
+
+/** Read an installed PNG or SVG icon; absent paths and directories have no pixels. */
+async function readIcon(path: string): Promise<DesktopIcon | null> {
+  const contentType = path.endsWith('.png') ? 'image/png' : path.endsWith('.svg') ? 'image/svg+xml' : null
+  if (contentType === null) return null
+  try {
+    if (!(await stat(path)).isFile()) return null
+    return { bytes: await readFile(path), contentType }
+  } catch (_error) {
+    // Missing or unreadable artwork does not remove an otherwise usable application.
+    return null
+  }
+}
+
+/**
+ * Resolve an absolute icon path or an installed hicolor/pixmaps icon name.
+ * @param name - desktop-entry Icon field.
+ * @param directories - XDG data roots in precedence order.
+ * @returns image bytes and media type, or null when artwork is unavailable.
+ */
+export async function desktopApplicationIcon(name: string, directories: readonly string[]): Promise<DesktopIcon | null> {
+  if (isAbsolute(name)) return readIcon(name)
+  for (const directory of directories) {
+    for (const size of ['512x512', '256x256', '128x128', '64x64', '48x48', '32x32']) {
+      for (const extension of ['png', 'svg']) {
+        const icon = await readIcon(join(directory, 'icons', 'hicolor', size, 'apps', `${name}.${extension}`))
+        if (icon !== null) return icon
+      }
+    }
+    const scalable = await readIcon(join(directory, 'icons', 'hicolor', 'scalable', 'apps', `${name}.svg`))
+    if (scalable !== null) return scalable
+    for (const extension of ['png', 'svg']) {
+      const icon = await readIcon(join(directory, 'pixmaps', `${name}.${extension}`))
+      if (icon !== null) return icon
+    }
+  }
+  return null
+}
diff --git a/packages/util/native-command/src/file-applications-linux.ts b/packages/util/native-command/src/file-applications-linux.ts
new file mode 100644
index 0000000000..017473f273
--- /dev/null
+++ b/packages/util/native-command/src/file-applications-linux.ts
@@ -0,0 +1,66 @@
+/** Linux file associations from GIO, with shared XDG metadata and artwork lookup. */
+import { readdir, readFile } from 'node:fs/promises'
+import { homedir } from 'node:os'
+import { join, relative, sep } from 'node:path'
+import { desktopApplicationIcon, desktopDataDirectories, desktopEntryFields } from './desktop-entry.ts'
+import type { NativeCommandRunner } from './runner.ts'
+import type { NativeFileApplication } from './types.ts'
+
+/** Find a desktop id, including ids derived from nested application directories. */
+async function desktopFile(root: string, id: string, directory = root): Promise<string | null> {
+  let entries
+  try { entries = await readdir(directory, { withFileTypes: true }) } catch (_error) {
+    // An absent XDG root contributes no applications.
+    return null
+  }
+  for (const entry of entries) {
+    const path = join(directory, entry.name)
+    if (!entry.isDirectory() && relative(root, path).split(sep).join('-') === id) return path
+  }
+  for (const entry of entries) {
+    if (entry.isDirectory()) {
+      const found = await desktopFile(root, id, join(directory, entry.name))
+      if (found !== null) return found
+    }
+  }
+  return null
+}
+
+/**
+ * Query all registered file handlers from GIO without executing desktop-entry command text.
+ * @param path - verified local file path.
+ * @param signal - caller cancellation.
+ * @param run - native command runner.
+ * @param env - XDG and locale settings.
+ * @returns registered applications with the desktop's default marked.
+ */
+export async function linuxFileApplications(
+  path: string, signal: AbortSignal, run: NativeCommandRunner, env: NodeJS.ProcessEnv,
+): Promise<readonly NativeFileApplication[]> {
+  const info = await run('gio', ['info', '-a', 'standard::content-type', path], signal)
+  const mime = /standard::content-type:\s*(\S+)/.exec(info.stdout)?.[1]
+  if (mime === undefined) throw new Error('GIO did not identify the file content type')
+  const result = await run('env', ['LC_ALL=C', 'gio', 'mime', mime], signal)
+  const preferred = /^Default application.*:\s*(.+\.desktop)\s*$/m.exec(result.stdout)?.[1]
+  const ids = [...new Set([...(preferred === undefined ? [] : [preferred]), ...result.stdout.split(/\r?\n/)
+    .filter(line => /^\s+.*\.desktop\s*$/.test(line)).map(line => line.trim())])]
+  const directories = desktopDataDirectories(env.HOME ?? homedir(), env)
+  const locale = (env.LC_ALL ?? env.LC_MESSAGES ?? env.LANG ?? '').replace(/\..*$/, '')
+  const applications: NativeFileApplication[] = []
+  for (const id of ids) {
+    signal.throwIfAborted()
+    let entryPath: string | null = null
+    for (const directory of directories) {
+      entryPath = await desktopFile(join(directory, 'applications'), id)
+      if (entryPath !== null) break
+    }
+    if (entryPath === null) continue
+    const fields = desktopEntryFields(await readFile(entryPath, 'utf8'))
+    const name = fields[`Name[${locale}]`] ?? fields[`Name[${locale.replace(/_.*/, '')}]`] ?? fields.Name
+    if (name === undefined || fields.Hidden === 'true') continue
+    const icon = fields.Icon === undefined ? null : await desktopApplicationIcon(fields.Icon, directories)
+    applications.push({ id: entryPath, name, default: id === preferred,
+      icon: icon === null ? null : `data:${icon.contentType};base64,${icon.bytes.toString('base64')}` })
+  }
+  return applications
+}
diff --git a/packages/util/native-command/src/file-applications-windows.ts b/packages/util/native-command/src/file-applications-windows.ts
new file mode 100644
index 0000000000..89a0526f6a
--- /dev/null
+++ b/packages/util/native-command/src/file-applications-windows.ts
@@ -0,0 +1,167 @@
+/** Windows Shell association queries and invocation; paths are encoded data, never PowerShell expressions. */
+import type { NativeCommandRunner } from './runner.ts'
+
+/** Shell interfaces are declared in their native vtable order; Invoke preserves packaged-app and DDE handling. */
+const WINDOWS_ASSOCIATIONS = String.raw`
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Runtime.InteropServices.ComTypes;
+using System.Text;
+
+public static class DshFileAssociations {
+  [ComImport, Guid("973810ae-9599-4b88-9e4d-6ee98c9552da"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+  public interface IEnumHandlers {
+    [PreserveSig] int Next(uint count, out IHandler handler, out uint fetched);
+  }
+  [ComImport, Guid("f04061ac-1659-4a3f-a954-775aa57fc083"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+  public interface IHandler {
+    void GetName([MarshalAs(UnmanagedType.LPWStr)] out string name);
+    void GetUIName([MarshalAs(UnmanagedType.LPWStr)] out string name);
+    void GetIconLocation([MarshalAs(UnmanagedType.LPWStr)] out string path, out int index);
+    [PreserveSig] int IsRecommended();
+    void MakeDefault([MarshalAs(UnmanagedType.LPWStr)] string description);
+    void Invoke(IDataObject data);
+    void CreateInvoker(IDataObject data, [MarshalAs(UnmanagedType.Interface)] out object invoker);
+  }
+  [ComImport, Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+  public interface IShellItem {
+    void BindToHandler(IntPtr context, ref Guid handler, ref Guid iid, [MarshalAs(UnmanagedType.Interface)] out IDataObject data);
+  }
+  [DllImport("shell32.dll", CharSet = CharSet.Unicode, PreserveSig = false)]
+  static extern void SHAssocEnumHandlers(string extension, uint filter, out IEnumHandlers handlers);
+  [DllImport("shell32.dll", CharSet = CharSet.Unicode, PreserveSig = false)]
+  static extern void SHCreateItemFromParsingName(string path, IntPtr context, ref Guid iid, out IShellItem item);
+  [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
+  static extern int AssocQueryString(uint flags, uint kind, string association, string extra, StringBuilder output, ref uint size);
+  [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
+  static extern int SHDefExtractIcon(string path, int index, uint flags, out IntPtr large, out IntPtr small, uint size);
+  [DllImport("user32.dll")]
+  static extern bool DestroyIcon(IntPtr icon);
+
+  public sealed class Application {
+    public string id;
+    public string name;
+    public string icon;
+    public bool @default;
+  }
+  static string Associated(string extension, uint kind) {
+    uint size = 0;
+    AssocQueryString(0, kind, extension, null, null, ref size);
+    if (size == 0) return null;
+    var text = new StringBuilder((int)size);
+    return AssocQueryString(0, kind, extension, null, text, ref size) == 0 ? text.ToString() : null;
+  }
+  static string IconData(IHandler handler) {
+    IntPtr large = IntPtr.Zero, small = IntPtr.Zero;
+    try {
+      string source; int index;
+      handler.GetIconLocation(out source, out index);
+      source = Environment.ExpandEnvironmentVariables(source);
+      if (Path.GetExtension(source).Equals(".png", StringComparison.OrdinalIgnoreCase)) {
+        using (var original = Image.FromFile(source))
+        using (var resized = new Bitmap(original, new Size(32, 32)))
+        using (var stream = new MemoryStream()) {
+          resized.Save(stream, ImageFormat.Png);
+          return "data:image/png;base64," + Convert.ToBase64String(stream.ToArray());
+        }
+      }
+      if (SHDefExtractIcon(source, index, 0, out large, out small, 32) != 0 || large == IntPtr.Zero) return null;
+      using (var image = Icon.FromHandle(large))
+      using (var bitmap = image.ToBitmap())
+      using (var stream = new MemoryStream()) {
+        bitmap.Save(stream, ImageFormat.Png);
+        return "data:image/png;base64," + Convert.ToBase64String(stream.ToArray());
+      }
+    } catch (Exception) {
+      // Missing icon resources do not make the application unusable.
+      return null;
+    } finally {
+      if (large != IntPtr.Zero) DestroyIcon(large);
+      if (small != IntPtr.Zero) DestroyIcon(small);
+    }
+  }
+  static void Visit(string path, Action<IHandler> visit) {
+    var extension = Path.GetExtension(path);
+    if (extension.Length == 0) return;
+    IEnumHandlers handlers;
+    SHAssocEnumHandlers(extension, 0, out handlers);
+    try {
+      while (true) {
+        IHandler handler; uint fetched;
+        int result = handlers.Next(1, out handler, out fetched);
+        Marshal.ThrowExceptionForHR(result);
+        if (fetched == 0) break;
+        try { visit(handler); } finally { Marshal.FinalReleaseComObject(handler); }
+      }
+    } finally { Marshal.FinalReleaseComObject(handlers); }
+  }
+  public static Application[] List(string path) {
+    var extension = Path.GetExtension(path);
+    var executable = extension.Length == 0 ? null : Associated(extension, 2);
+    var appId = extension.Length == 0 ? null : Associated(extension, 21);
+    var apps = new List<Application>();
+    var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+    Visit(path, delegate(IHandler handler) {
+      string id, name;
+      handler.GetName(out id); handler.GetUIName(out name);
+      if (!seen.Add(id)) return;
+      apps.Add(new Application { id = id, name = name, icon = IconData(handler),
+        @default = String.Equals(id, executable, StringComparison.OrdinalIgnoreCase) || String.Equals(id, appId, StringComparison.OrdinalIgnoreCase) });
+    });
+    return apps.ToArray();
+  }
+  public static void Open(string path, string application) {
+    bool opened = false;
+    Visit(path, delegate(IHandler handler) {
+      string id; handler.GetName(out id);
+      if (opened || !String.Equals(id, application, StringComparison.OrdinalIgnoreCase)) return;
+      var iid = typeof(IShellItem).GUID;
+      IShellItem item;
+      SHCreateItemFromParsingName(path, IntPtr.Zero, ref iid, out item);
+      IDataObject data = null;
+      try {
+        var bhid = new Guid("b8c0bd9f-ed24-455c-83e6-d5390c4fe8c4");
+        var dataIid = typeof(IDataObject).GUID;
+        item.BindToHandler(IntPtr.Zero, ref bhid, ref dataIid, out data);
+        handler.Invoke(data);
+        opened = true;
+      } finally {
+        if (data != null) Marshal.FinalReleaseComObject(data);
+        Marshal.FinalReleaseComObject(item);
+      }
+    });
+    if (!opened) throw new InvalidOperationException("Application is not registered for this file");
+  }
+}`
+
+/**
+ * Execute the Windows Shell adapter in a Unicode STA PowerShell process.
+ * @param path - Windows file path, translated by the caller for WSL.
+ * @param application - registered handler to invoke; null requests the application list.
+ * @param signal - caller cancellation.
+ * @param run - native command runner.
+ * @returns adapter output; query mode emits a JSON array.
+ */
+export async function windowsFileApplications(
+  path: string, application: string | null, signal: AbortSignal, run: NativeCommandRunner,
+): Promise<string> {
+  const encodedPath = Buffer.from(path).toString('base64')
+  const encodedApplication = Buffer.from(application ?? '').toString('base64')
+  const script = `$ErrorActionPreference = 'Stop'
+[Console]::OutputEncoding = New-Object System.Text.UTF8Encoding($false)
+Add-Type -ReferencedAssemblies System.Drawing -TypeDefinition @'
+${WINDOWS_ASSOCIATIONS}
+'@
+$path = [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${encodedPath}'))
+$application = [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${encodedApplication}'))
+${application === null ? 'ConvertTo-Json -InputObject @([DshFileAssociations]::List($path)) -Depth 4 -Compress' : '[DshFileAssociations]::Open($path, $application)'}
+`
+  const result = await run('powershell.exe', [
+    '-NoProfile', '-NonInteractive', '-STA', '-EncodedCommand', Buffer.from(script, 'utf16le').toString('base64'),
+  ], signal)
+  return result.stdout
+}
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index 50e7c215ae..c401fe2a58 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -1,5 +1,8 @@
 /** Native file associations queried from the desktop that owns the path. */
 import { runNativeCommand } from './runner.ts'
+import { linuxFileApplications } from './file-applications-linux.ts'
+import { windowsFileApplications } from './file-applications-windows.ts'
+import { nativeFileManager } from './path-opener.ts'
 import type { PathOpenerInternals } from './path-opener.ts'
 
 import type { NativeFileApplication } from './types.ts'
@@ -47,10 +50,15 @@ export async function nativeFileApplications(
   path: string, signal: AbortSignal, internals: PathOpenerInternals = {},
 ): Promise<readonly NativeFileApplication[]> {
   signal.throwIfAborted()
-  const platform = internals.platform ?? process.platform
-  if (platform !== 'darwin') return []
+  const target = await desktopTarget(path, signal, internals)
   const run = internals.run ?? runNativeCommand
-  const { stdout } = await run('osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, path], signal)
+  if (target.platform === 'linux') return linuxFileApplications(path, signal, run, internals.env ?? process.env)
+  let stdout: string
+  if (target.platform === 'darwin') {
+    stdout = (await run('osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, target.path], signal)).stdout
+  } else if (target.platform === 'win32') {
+    stdout = await windowsFileApplications(target.path, null, signal, run)
+  } else return []
   const value: unknown = JSON.parse(stdout)
   if (!Array.isArray(value)) throw new Error('Invalid native application list')
   const applications: NativeFileApplication[] = []
@@ -60,7 +68,7 @@ export async function nativeFileApplications(
       || !('id' in entry) || !('name' in entry) || !('default' in entry) || !('icon' in entry)
       || typeof entry.id !== 'string' || entry.id.length === 0
       || typeof entry.name !== 'string' || typeof entry.default !== 'boolean'
-      || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/png;base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
+      || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/(?:png|svg\+xml);base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
       throw new Error('Invalid native application entry')
     }
     applications.push({ id: entry.id, name: entry.name, default: entry.default, icon: entry.icon })
@@ -79,8 +87,29 @@ export async function nativeFileApplications(
 export async function openNativeFileApplication(
   path: string, application: string, signal: AbortSignal, internals: PathOpenerInternals = {},
 ): Promise<void> {
+  const target = await desktopTarget(path, signal, internals)
+  const run = internals.run ?? runNativeCommand
+  if (target.platform === 'win32') {
+    await windowsFileApplications(target.path, application, signal, run)
+    return
+  }
   const apps = await nativeFileApplications(path, signal, internals)
   if (!apps.some(app => app.id === application)) throw new Error('Application is not registered for this file')
-  const run = internals.run ?? runNativeCommand
-  await run('open', ['-a', application, path], signal)
+  if (target.platform === 'linux') await run('gio', ['launch', application, path], signal)
+  else await run('open', ['-a', application, path], signal)
+}
+
+/** Resolve the desktop that owns the file, including Windows applications reached from WSL. */
+async function desktopTarget(
+  path: string, signal: AbortSignal, internals: PathOpenerInternals,
+): Promise<{ platform: NodeJS.Platform; path: string }> {
+  signal.throwIfAborted()
+  const platform = internals.platform ?? process.platform
+  if (platform === 'linux' && nativeFileManager(internals) === 'explorer') {
+    const translated = await (internals.run ?? runNativeCommand)('wslpath', ['-w', path], signal)
+    const windowsPath = translated.stdout.replace(/[\r\n]+$/, '')
+    if (windowsPath === '') throw new Error('wslpath returned no Windows path')
+    return { platform: 'win32', path: windowsPath }
+  }
+  return { platform, path }
 }
diff --git a/packages/util/native-command/src/index.ts b/packages/util/native-command/src/index.ts
index ea948a745b..aa7dd946cb 100644
--- a/packages/util/native-command/src/index.ts
+++ b/packages/util/native-command/src/index.ts
@@ -21,3 +21,5 @@ export type {
 
 export { nativeFileApplications, openNativeFileApplication } from './file-applications.ts'
 export type { NativeFileApplication } from './file-applications.ts'
+
+export { desktopEntryFields, desktopDataDirectories, desktopApplicationIcon } from './desktop-entry.ts'
diff --git a/packages/util/native-command/src/types.ts b/packages/util/native-command/src/types.ts
index 4b67d05159..1e93b93bc5 100644
--- a/packages/util/native-command/src/types.ts
+++ b/packages/util/native-command/src/types.ts
@@ -6,6 +6,6 @@ export interface NativeFileApplication {
   readonly id: string
   readonly name: string
   readonly default: boolean
-  /** PNG data URL, or null when the desktop supplies no icon. */
+  /** PNG or SVG data URL, or null when the desktop supplies no icon. */
   readonly icon: string | null
 }
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index b8aeed5c26..5a6ab8a5ab 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -41,7 +41,33 @@ describe('native file associations', () => {
 it('uses the production command adapter and current platform when no override is supplied', async () => {
   const run = vi.spyOn(runner, 'runNativeCommand').mockResolvedValue({ stdout: JSON.stringify([application]), stderr: '' })
   onTestFinished(() => { run.mockRestore() })
-  expect(await nativeFileApplications('/file.mp3', signal)).toEqual(process.platform === 'darwin' ? [application] : [])
+  if (process.platform !== 'linux') expect(await nativeFileApplications('/file.mp3', signal)).toEqual([application])
   await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin' })
   expect(run).toHaveBeenLastCalledWith('open', ['-a', application.id, '/file.mp3'], signal)
 })
+
+
+it('encodes Windows query and invocation data separately from native adapter source', async () => {
+  const run = vi.fn<runner.NativeCommandRunner>(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
+  const path = "C:\\测试\\a'; write-host nope.mp3"
+  expect(await nativeFileApplications(path, signal, { platform: 'win32', run })).toEqual([application])
+  const query = Buffer.from(run.mock.calls[0]![1]!.at(-1)!, 'base64').toString('utf16le')
+  expect(query).toContain(Buffer.from(path).toString('base64'))
+  expect(query).not.toContain(path)
+  expect(query).toContain('::List($path)')
+  await openNativeFileApplication(path, application.id, signal, { platform: 'win32', run })
+  expect(Buffer.from(run.mock.calls[1]![1]!.at(-1)!, 'base64').toString('utf16le')).toContain('::Open($path, $application)')
+  expect(run.mock.calls[1]![0]).toBe('powershell.exe')
+})
+
+it('uses the Windows desktop for WSL paths and rejects an empty translation', async () => {
+  const run = vi.fn<runner.NativeCommandRunner>(async command => ({
+    stdout: command === 'wslpath' ? 'C:\\音频.mp3\n' : JSON.stringify([application]), stderr: '',
+  }))
+  const facts = { platform: 'linux' as const, osRelease: 'microsoft', env: {}, run }
+  expect(await nativeFileApplications('/mnt/c/音频.mp3', signal, facts)).toEqual([application])
+  await openNativeFileApplication('/mnt/c/音频.mp3', application.id, signal, facts)
+  expect(run).toHaveBeenCalledWith('wslpath', ['-w', '/mnt/c/音频.mp3'], signal)
+  const empty = async () => ({ stdout: '', stderr: '' })
+  await expect(nativeFileApplications('/a', signal, { ...facts, run: empty })).rejects.toThrow('no Windows path')
+})

From a8c5ca85a10f0d87a301a7a5a8e1cf7cc906af84 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:15:15 +0800
Subject: [PATCH 19/62] test: cover Linux associations and native Windows Shell
 handoff

---
 .../tests/file-applications-linux.spec.ts     | 51 ++++++++++++++++
 .../tests/file-applications-windows.spec.ts   | 58 +++++++++++++++++++
 .../tests/file-applications.spec.ts           |  6 +-
 3 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 packages/util/native-command/tests/file-applications-linux.spec.ts
 create mode 100644 packages/util/native-command/tests/file-applications-windows.spec.ts

diff --git a/packages/util/native-command/tests/file-applications-linux.spec.ts b/packages/util/native-command/tests/file-applications-linux.spec.ts
new file mode 100644
index 0000000000..573f7c45c2
--- /dev/null
+++ b/packages/util/native-command/tests/file-applications-linux.spec.ts
@@ -0,0 +1,51 @@
+/** Linux association parsing over isolated installed-entry fixtures and an injected OS command runner. */
+import { mkdtemp, mkdir, writeFile, rm } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { expect, it, onTestFinished, vi } from 'vitest'
+import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
+import type { NativeCommandRunner } from '../src/runner.ts'
+
+async function fixture() {
+  const root = await mkdtemp(join(tmpdir(), 'dsh-file-apps-'))
+  onTestFinished(() => rm(root, { recursive: true, force: true }))
+  await mkdir(join(root, 'applications', 'nested'), { recursive: true })
+  await mkdir(join(root, 'pixmaps'))
+  await writeFile(join(root, 'applications', 'player.desktop'), '[Desktop Entry]\nName=Player\nName[zh_CN]=播放器\nIcon=player\nExec=player %f\n[Desktop Action Extra]\nName=Wrong\n')
+  await writeFile(join(root, 'applications', 'nested', 'other.desktop'), '[Desktop Entry]\nName=Other\nExec=other %f\n')
+  await writeFile(join(root, 'pixmaps', 'player.svg'), '<svg xmlns="http://www.w3.org/2000/svg"/>')
+  const run = vi.fn<NativeCommandRunner>(async (command, args) => ({
+    stdout: command === 'gio' && args[0] === 'info' ? '  standard::content-type: audio/mpeg\n'
+      : command === 'env' ? 'Default application for audio/mpeg: player.desktop\nRegistered applications:\n  player.desktop\n  nested-other.desktop\n  missing.desktop\nRecommended applications:\n  player.desktop\n' : '', stderr: '',
+  }))
+  return { root, run, facts: { platform: 'linux' as const, osRelease: 'linux', env: { XDG_DATA_HOME: root, XDG_DATA_DIRS: '', LANG: 'zh_CN.UTF-8' }, run } }
+}
+
+it('deduplicates GIO handlers, resolves nested ids, localizes names, and reuses desktop artwork', async () => {
+  const { root, facts, run } = await fixture()
+  const signal = new AbortController().signal
+  const apps = await nativeFileApplications('/file.mp3', signal, facts)
+  expect(apps).toEqual([
+    { id: join(root, 'applications', 'player.desktop'), name: '播放器', default: true, icon: expect.stringMatching(/^data:image\/svg\+xml;base64,/) },
+    { id: join(root, 'applications', 'nested', 'other.desktop'), name: 'Other', default: false, icon: null },
+  ])
+  await openNativeFileApplication('/file.mp3', apps[0]!.id, signal, facts)
+  expect(run).toHaveBeenLastCalledWith('gio', ['launch', apps[0]!.id, '/file.mp3'], signal)
+  await expect(openNativeFileApplication('/file.mp3', '/unregistered.desktop', signal, facts)).rejects.toThrow('not registered')
+})
+
+it('keeps nondefault applications when the desktop has no default and omits hidden or unnamed entries', async () => {
+  const { root, facts, run } = await fixture()
+  await writeFile(join(root, 'applications', 'player.desktop'), '[Desktop Entry]\nHidden=true\nName=Hidden\n')
+  await writeFile(join(root, 'applications', 'unnamed.desktop'), '[Desktop Entry]\nExec=unnamed\n')
+  run.mockImplementation(async command => ({ stdout: command === 'gio' ? 'standard::content-type: audio/mpeg' : 'Registered applications:\n  player.desktop\n  unnamed.desktop\n  nested-other.desktop\n', stderr: '' }))
+  expect(await nativeFileApplications('/file.mp3', new AbortController().signal, facts)).toEqual([
+    { id: join(root, 'applications', 'nested', 'other.desktop'), name: 'Other', default: false, icon: null },
+  ])
+})
+
+it('rejects missing content-type metadata instead of fabricating associations', async () => {
+  const { facts, run } = await fixture()
+  run.mockResolvedValue({ stdout: 'no content type', stderr: '' })
+  await expect(nativeFileApplications('/file.mp3', new AbortController().signal, facts)).rejects.toThrow('content type')
+})
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
new file mode 100644
index 0000000000..ea1dfa5486
--- /dev/null
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -0,0 +1,58 @@
+/** Real Windows Shell discovery and invocation with a private file extension and a short-lived fixture application. */
+import { randomUUID } from 'node:crypto'
+import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { expect, it, vi } from 'vitest'
+import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
+import { runNativeCommand } from '../src/runner.ts'
+
+/** Encode fixture data without placing its quotes or Unicode in executable PowerShell text. */
+function literal(value: string): string {
+  return `[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${Buffer.from(value).toString('base64')}'))`
+}
+
+it.skipIf(process.platform !== 'win32')('queries and invokes a registered Windows handler through the system Shell', async () => {
+  const root = await mkdtemp(join(tmpdir(), 'dsh-windows-association-'))
+  const suffix = randomUUID().replaceAll('-', '')
+  const extension = `.dsh${suffix}`
+  const progId = `DSH.Test.${suffix}`
+  const path = join(root, `测试 ' audio${extension}`)
+  const marker = join(root, 'opened.json')
+  const script = join(root, 'handler.cjs')
+  const lifetime = new AbortController()
+  const runScript = async (source: string): Promise<void> => {
+    await runNativeCommand('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], lifetime.signal)
+  }
+  await writeFile(path, 'test')
+  await writeFile(script, `require('node:fs').writeFileSync(${JSON.stringify(marker)}, JSON.stringify({ path: process.argv[2], pid: process.pid }));\n`)
+  try {
+    await runScript(`$ErrorActionPreference = 'Stop'
+$root = [Microsoft.Win32.Registry]::CurrentUser
+$key = $root.CreateSubKey('Software\\Classes\\${extension}')
+$key.SetValue('', '${progId}'); $key.Dispose()
+$key = $root.CreateSubKey('Software\\Classes\\${extension}\\OpenWithProgids')
+$key.SetValue('${progId}', ''); $key.Dispose()
+$key = $root.CreateSubKey('Software\\Classes\\${progId}\\shell\\open\\command')
+$key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Dispose()
+`)
+    const applications = await nativeFileApplications(path, lifetime.signal)
+    const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
+    expect(expected).toMatchObject({ default: true, name: expect.any(String) })
+    await openNativeFileApplication(path, expected!.id, lifetime.signal)
+    let opened: { path: string; pid: number } | undefined
+    await vi.waitFor(async () => {
+      opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
+      expect(opened.path).toBe(path)
+    })
+    // Shell invocation does not own the application's lifetime; wait for this fixture's process to exit before removing its files.
+    await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() })
+  } finally {
+    await runScript(`$root = [Microsoft.Win32.Registry]::CurrentUser
+$root.DeleteSubKeyTree('Software\\Classes\\${extension}', $false)
+$root.DeleteSubKeyTree('Software\\Classes\\${progId}', $false)
+`)
+    lifetime.abort()
+    await rm(root, { recursive: true, force: true })
+  }
+})
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index 5a6ab8a5ab..8ef2e5e352 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -39,9 +39,11 @@ describe('native file associations', () => {
 
 
 it('uses the production command adapter and current platform when no override is supplied', async () => {
-  const run = vi.spyOn(runner, 'runNativeCommand').mockResolvedValue({ stdout: JSON.stringify([application]), stderr: '' })
+  const run = vi.spyOn(runner, 'runNativeCommand').mockImplementation(async command => ({
+    stdout: command === 'gio' ? 'standard::content-type: audio/mpeg' : command === 'env' ? 'No applications found' : JSON.stringify([application]), stderr: '',
+  }))
   onTestFinished(() => { run.mockRestore() })
-  if (process.platform !== 'linux') expect(await nativeFileApplications('/file.mp3', signal)).toEqual([application])
+  expect(await nativeFileApplications('/file.mp3', signal)).toEqual(process.platform === 'linux' ? [] : [application])
   await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin' })
   expect(run).toHaveBeenLastCalledWith('open', ['-a', application.id, '/file.mp3'], signal)
 })

From aac990d2d4fb30fe218e3d2f2a47e1797d93b2f6 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:20:04 +0800
Subject: [PATCH 20/62] test: cover desktop lookup fallbacks and cancel native
 fixture work

---
 .../tests/open-in-app-action.client.spec.tsx  |  4 +-
 .../native-command/src/file-applications.ts   |  1 +
 .../tests/file-applications-linux.spec.ts     | 13 ++++++
 .../tests/file-applications-windows.spec.ts   | 45 ++++++++++---------
 .../tests/file-applications.spec.ts           | 12 +++++
 5 files changed, 51 insertions(+), 24 deletions(-)

diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 2152a47d05..67f3fe8be6 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -77,11 +77,11 @@ describe('OpenInAppAction visibility', () => {
 
   it('shows the remembered choice, falling back to the first available app when it is gone', () => {
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'cursor', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['path.open'] })).toBeDefined()
+    expect(screen.getByRole('button', { name: zh['path.open'] }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/cursor')
     cleanup()
 
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'vscode', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['path.open'] })).toBeDefined()
+    expect(screen.getByRole('button', { name: zh['path.open'] }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/finder')
   })
 })
 
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index c401fe2a58..b61e9993a4 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -107,6 +107,7 @@ async function desktopTarget(
   const platform = internals.platform ?? process.platform
   if (platform === 'linux' && nativeFileManager(internals) === 'explorer') {
     const translated = await (internals.run ?? runNativeCommand)('wslpath', ['-w', path], signal)
+    signal.throwIfAborted()
     const windowsPath = translated.stdout.replace(/[\r\n]+$/, '')
     if (windowsPath === '') throw new Error('wslpath returned no Windows path')
     return { platform: 'win32', path: windowsPath }
diff --git a/packages/util/native-command/tests/file-applications-linux.spec.ts b/packages/util/native-command/tests/file-applications-linux.spec.ts
index 573f7c45c2..366dbbfa63 100644
--- a/packages/util/native-command/tests/file-applications-linux.spec.ts
+++ b/packages/util/native-command/tests/file-applications-linux.spec.ts
@@ -3,6 +3,7 @@ import { mkdtemp, mkdir, writeFile, rm } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { expect, it, onTestFinished, vi } from 'vitest'
+import { desktopApplicationIcon } from '../src/desktop-entry.ts'
 import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
 import type { NativeCommandRunner } from '../src/runner.ts'
 
@@ -49,3 +50,15 @@ it('rejects missing content-type metadata instead of fabricating associations',
   run.mockResolvedValue({ stdout: 'no content type', stderr: '' })
   await expect(nativeFileApplications('/file.mp3', new AbortController().signal, facts)).rejects.toThrow('content type')
 })
+
+
+it('tolerates absent desktop roots and directory-shaped icon paths without a locale override', async () => {
+  const { root, facts } = await fixture()
+  const icon = join(root, 'folder.png')
+  await mkdir(icon)
+  expect(await desktopApplicationIcon(icon, [])).toBeNull()
+  const apps = await nativeFileApplications('/file.mp3', new AbortController().signal, {
+    ...facts, env: { XDG_DATA_HOME: root, XDG_DATA_DIRS: join(root, 'absent') },
+  })
+  expect(apps[0]?.name).toBe('Player')
+})
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index ea1dfa5486..4d309b9fc9 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -3,7 +3,7 @@ import { randomUUID } from 'node:crypto'
 import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
-import { expect, it, vi } from 'vitest'
+import { expect, it, vi, onTestFinished } from 'vitest'
 import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
 import { runNativeCommand } from '../src/runner.ts'
 
@@ -24,10 +24,19 @@ it.skipIf(process.platform !== 'win32')('queries and invokes a registered Window
   const runScript = async (source: string): Promise<void> => {
     await runNativeCommand('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], lifetime.signal)
   }
+  onTestFinished(async () => {
+    lifetime.abort()
+    try {
+      await runNativeCommand('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(`
+$root = [Microsoft.Win32.Registry]::CurrentUser
+$root.DeleteSubKeyTree('Software\\Classes\\${extension}', $false)
+$root.DeleteSubKeyTree('Software\\Classes\\${progId}', $false)
+`, 'utf16le').toString('base64')], new AbortController().signal)
+    } finally { await rm(root, { recursive: true, force: true }) }
+  })
   await writeFile(path, 'test')
   await writeFile(script, `require('node:fs').writeFileSync(${JSON.stringify(marker)}, JSON.stringify({ path: process.argv[2], pid: process.pid }));\n`)
-  try {
-    await runScript(`$ErrorActionPreference = 'Stop'
+  await runScript(`$ErrorActionPreference = 'Stop'
 $root = [Microsoft.Win32.Registry]::CurrentUser
 $key = $root.CreateSubKey('Software\\Classes\\${extension}')
 $key.SetValue('', '${progId}'); $key.Dispose()
@@ -36,23 +45,15 @@ $key.SetValue('${progId}', ''); $key.Dispose()
 $key = $root.CreateSubKey('Software\\Classes\\${progId}\\shell\\open\\command')
 $key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Dispose()
 `)
-    const applications = await nativeFileApplications(path, lifetime.signal)
-    const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
-    expect(expected).toMatchObject({ default: true, name: expect.any(String) })
-    await openNativeFileApplication(path, expected!.id, lifetime.signal)
-    let opened: { path: string; pid: number } | undefined
-    await vi.waitFor(async () => {
-      opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
-      expect(opened.path).toBe(path)
-    })
-    // Shell invocation does not own the application's lifetime; wait for this fixture's process to exit before removing its files.
-    await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() })
-  } finally {
-    await runScript(`$root = [Microsoft.Win32.Registry]::CurrentUser
-$root.DeleteSubKeyTree('Software\\Classes\\${extension}', $false)
-$root.DeleteSubKeyTree('Software\\Classes\\${progId}', $false)
-`)
-    lifetime.abort()
-    await rm(root, { recursive: true, force: true })
-  }
+  const applications = await nativeFileApplications(path, lifetime.signal)
+  const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
+  expect(expected).toMatchObject({ default: true, name: expect.any(String) })
+  await openNativeFileApplication(path, expected!.id, lifetime.signal)
+  let opened: { path: string; pid: number } | undefined
+  await vi.waitFor(async () => {
+    opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
+    expect(opened.path).toBe(path)
+  }, { timeout: vi.getConfig().testTimeout })
+  // Shell invocation does not own the application's lifetime; wait for this fixture's process to exit before removing its files.
+  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: vi.getConfig().testTimeout })
 })
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index 8ef2e5e352..ffe70ba857 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -73,3 +73,15 @@ it('uses the Windows desktop for WSL paths and rejects an empty translation', as
   const empty = async () => ({ stdout: '', stderr: '' })
   await expect(nativeFileApplications('/a', signal, { ...facts, run: empty })).rejects.toThrow('no Windows path')
 })
+
+
+it('uses production environment and runner defaults for Linux and WSL', async () => {
+  const run = vi.spyOn(runner, 'runNativeCommand').mockImplementation(async command => ({
+    stdout: command === 'gio' ? 'standard::content-type: audio/mpeg'
+      : command === 'env' ? 'No applications found'
+        : command === 'wslpath' ? 'C:\\file.mp3\n' : JSON.stringify([application]), stderr: '',
+  }))
+  onTestFinished(() => { run.mockRestore() })
+  expect(await nativeFileApplications('/file.mp3', signal, { platform: 'linux', osRelease: 'linux' })).toEqual([])
+  expect(await nativeFileApplications('/file.mp3', signal, { platform: 'linux', osRelease: 'microsoft', env: {} })).toEqual([application])
+})

From b4b0c4e4c8bf29159477e8f00f72a880c719ab4d Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:24:09 +0800
Subject: [PATCH 21/62] test: exercise native Linux file handoff and document
 shared adapters

---
 .../file-applications-linux-native.spec.ts    | 59 +++++++++++++++++++
 .../tests/file-applications-windows.spec.ts   | 16 +++--
 2 files changed, 71 insertions(+), 4 deletions(-)
 create mode 100644 packages/util/native-command/tests/file-applications-linux-native.spec.ts

diff --git a/packages/util/native-command/tests/file-applications-linux-native.spec.ts b/packages/util/native-command/tests/file-applications-linux-native.spec.ts
new file mode 100644
index 0000000000..4d40b05770
--- /dev/null
+++ b/packages/util/native-command/tests/file-applications-linux-native.spec.ts
@@ -0,0 +1,59 @@
+/** Real GIO discovery and desktop-entry launch in private XDG data/config roots. */
+import { execFile, spawnSync } from 'node:child_process'
+import { promisify } from 'node:util'
+import { mkdtemp, mkdir, readFile, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { expect, it, onTestFinished, vi } from 'vitest'
+import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
+import type { NativeCommandRunner } from '../src/runner.ts'
+
+const gioAvailable = process.platform === 'linux' && spawnSync('gio', ['help'], { stdio: 'ignore' }).error === undefined
+const execute = promisify(execFile)
+
+/** Desktop Exec quoted-argument syntax; GIO performs its expansion. */
+function quoted(value: string): string {
+  return `"${value.replace(/[\\"`$]/g, match => `\\${match}`)}"`
+}
+
+it.skipIf(!gioAvailable)('queries and launches an installed Linux desktop entry through GIO', async () => {
+  const root = await mkdtemp(join(tmpdir(), 'dsh-gio-associations-'))
+  const lifetime = new AbortController()
+  const active = new Set<Promise<Awaited<ReturnType<NativeCommandRunner>>>>()
+  onTestFinished(async () => {
+    lifetime.abort()
+    await Promise.allSettled([...active])
+    await rm(root, { recursive: true, force: true })
+  })
+  const data = join(root, 'data')
+  const config = join(root, 'config')
+  const empty = join(root, 'empty')
+  await mkdir(join(data, 'applications'), { recursive: true })
+  await mkdir(config)
+  await mkdir(empty)
+  const path = join(root, "测试 ' file.txt")
+  const script = join(root, 'handler.cjs')
+  const marker = join(root, 'opened.json')
+  await writeFile(path, 'plain text')
+  await writeFile(script, `require('node:fs').writeFileSync(${JSON.stringify(marker)}, JSON.stringify({ path: process.argv[2], pid: process.pid }));\n`)
+  const desktop = join(data, 'applications', 'dsh-test.desktop')
+  await writeFile(desktop, `[Desktop Entry]\nType=Application\nName=DSH Test Handler\nExec=${quoted(process.execPath)} ${quoted(script)} %f\nMimeType=text/plain;\n`)
+  await writeFile(join(data, 'applications', 'mimeinfo.cache'), '[MIME Cache]\ntext/plain=dsh-test.desktop;\n')
+  await writeFile(join(config, 'mimeapps.list'), '[Default Applications]\ntext/plain=dsh-test.desktop;\n')
+  const env = { ...process.env, XDG_DATA_HOME: data, XDG_DATA_DIRS: empty, XDG_CONFIG_HOME: config, XDG_CONFIG_DIRS: empty, LC_ALL: 'C' }
+  const run: NativeCommandRunner = (command, args, signal) => {
+    const task = execute(command, [...args], { signal, env, encoding: 'utf8' })
+    active.add(task)
+    void task.then(() => active.delete(task), () => active.delete(task))
+    return task
+  }
+  const apps = await nativeFileApplications(path, lifetime.signal, { run, env })
+  expect(apps).toContainEqual({ id: desktop, name: 'DSH Test Handler', default: true, icon: null })
+  await openNativeFileApplication(path, desktop, lifetime.signal, { run, env })
+  let opened: { path: string; pid: number } | undefined
+  await vi.waitFor(async () => {
+    opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
+    expect(opened.path).toBe(path)
+  }, { timeout: vi.getConfig().testTimeout })
+  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: vi.getConfig().testTimeout })
+})
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index 4d309b9fc9..b0d297aa90 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -5,7 +5,7 @@ import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { expect, it, vi, onTestFinished } from 'vitest'
 import { nativeFileApplications, openNativeFileApplication } from '../src/file-applications.ts'
-import { runNativeCommand } from '../src/runner.ts'
+import { runNativeCommand, type NativeCommandRunner } from '../src/runner.ts'
 
 /** Encode fixture data without placing its quotes or Unicode in executable PowerShell text. */
 function literal(value: string): string {
@@ -21,11 +21,19 @@ it.skipIf(process.platform !== 'win32')('queries and invokes a registered Window
   const marker = join(root, 'opened.json')
   const script = join(root, 'handler.cjs')
   const lifetime = new AbortController()
+  const active = new Set<Promise<Awaited<ReturnType<NativeCommandRunner>>>>()
+  const run: NativeCommandRunner = (command, args, signal) => {
+    const task = runNativeCommand(command, args, signal)
+    active.add(task)
+    void task.then(() => active.delete(task), () => active.delete(task))
+    return task
+  }
   const runScript = async (source: string): Promise<void> => {
-    await runNativeCommand('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], lifetime.signal)
+    await run('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], lifetime.signal)
   }
   onTestFinished(async () => {
     lifetime.abort()
+    await Promise.allSettled([...active])
     try {
       await runNativeCommand('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(`
 $root = [Microsoft.Win32.Registry]::CurrentUser
@@ -45,10 +53,10 @@ $key.SetValue('${progId}', ''); $key.Dispose()
 $key = $root.CreateSubKey('Software\\Classes\\${progId}\\shell\\open\\command')
 $key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Dispose()
 `)
-  const applications = await nativeFileApplications(path, lifetime.signal)
+  const applications = await nativeFileApplications(path, lifetime.signal, { run })
   const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
   expect(expected).toMatchObject({ default: true, name: expect.any(String) })
-  await openNativeFileApplication(path, expected!.id, lifetime.signal)
+  await openNativeFileApplication(path, expected!.id, lifetime.signal, { run })
   let opened: { path: string; pid: number } | undefined
   await vi.waitFor(async () => {
     opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }

From b689c724d19e8d104687f55e6fe6fce260e8472a Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:28:41 +0800
Subject: [PATCH 22/62] docs: describe cross-platform file opening and pin
 desktop browser fixtures

---
 apps/web/tests/document-preview.e2e.ts        | 21 +++++++++++++++++--
 .../client/ui-open-in-app/README.i18n.yaml    |  4 ++--
 packages/client/ui-open-in-app/README.md      |  2 +-
 packages/client/ui-open-in-app/README.zh.md   |  2 +-
 packages/host/open-in-app/README.i18n.yaml    |  4 ++--
 packages/host/open-in-app/README.md           |  2 ++
 packages/host/open-in-app/README.zh.md        |  2 ++
 packages/util/native-command/README.i18n.yaml |  4 ++--
 packages/util/native-command/README.md        |  4 +++-
 packages/util/native-command/README.zh.md     |  4 +++-
 .../src/file-applications-windows.ts          |  2 +-
 11 files changed, 38 insertions(+), 13 deletions(-)

diff --git a/apps/web/tests/document-preview.e2e.ts b/apps/web/tests/document-preview.e2e.ts
index 8858a9011c..78ef7a408e 100644
--- a/apps/web/tests/document-preview.e2e.ts
+++ b/apps/web/tests/document-preview.e2e.ts
@@ -113,6 +113,23 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
         ]
         await writeFile(join(nativeRoot, 'osascript'), `#!/usr/bin/env node\nprocess.stdout.write(${JSON.stringify(JSON.stringify(apps))});\n`, { mode: 0o700 })
       }
+      if (process.platform === 'linux') {
+        const data = join(nativeRoot, 'data')
+        await mkdir(join(data, 'applications'), { recursive: true })
+        const icon = join(nativeRoot, 'icon.png')
+        await writeFile(icon, TINY_PNG)
+        await writeFile(join(data, 'applications', 'test.desktop'), `[Desktop Entry]\nName=Test Player\nIcon=${icon}\n`)
+        await writeFile(join(data, 'applications', 'other.desktop'), '[Desktop Entry]\nName=Other Player\n')
+        await writeFile(join(nativeRoot, 'gio'), `#!/usr/bin/env node
+const fs = require('node:fs');
+if (process.argv[2] === 'info') process.stdout.write('standard::content-type: video/mp4');
+else if (process.argv[2] === 'mime') process.stdout.write('Default application for video/mp4: test.desktop\\nRegistered applications:\\n  test.desktop\\n  other.desktop\\n');
+else if (process.argv[2] === 'launch') fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path: process.argv[4], action: 'application' }) + '\\n');
+else process.exit(1);
+`, { mode: 0o700 })
+        vi.stubEnv('XDG_DATA_HOME', data)
+        vi.stubEnv('XDG_DATA_DIRS', '')
+      }
       vi.stubEnv('PATH', `${nativeRoot}${delimiter}${process.env.PATH ?? ''}`)
     }
     // The Open In rows carry the default-application controls; the SSH marker
@@ -763,11 +780,11 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action }) +
       await page.getByRole('menuitem', { name: /^Show file location/ }).click()
       await expect.poll(async () => (await opened()).length, { timeout: 15_000 }).toBe(2)
       const gestures = await opened()
-      expect(gestures[0]?.action).toBe(process.platform === 'darwin' ? 'open' : 'reveal')
+      expect(gestures[0]?.action).toBe('open')
       expect([clip, cwd]).toContain(gestures[0]?.path)
       expect(gestures[1]?.action).toBe('reveal')
       expect([clip, cwd]).toContain(gestures[1]?.path)
-      if (process.platform === 'darwin') {
+      if (STUB_OPENER) {
         await expect.poll(() => headerOpen.locator('img').count()).toBe(1)
         await prominent.getByRole('button', { name: 'More ways to open' }).click()
         await page.getByRole('menuitem', { name: 'Test Player (default)', exact: true }).waitFor()
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index 40f6d2006d..09253522bb 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: e59377e315e0959cdb741cad91a04ae769586c89
-README.zh.md: 72461b43a8b520d8b7c008aedeb310ed9e1998d5
+README.md: 9af134a5b223e6e2342723730700ea6663108928
+README.zh.md: 9f59f2bad80603649ea78b0e430c8fd3c2cbee15
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index e59377e315..9af134a5b2 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -29,7 +29,7 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 ### What to expect
 
-The Session header and document header use the same 24px-high, icon-only split button with 9px corners. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
+The Session header and document header use the same 24px-high split button with 9px corners. The Session header includes “Open” text; the document header shows only the icon. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
 File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 72461b43a8..9f59f2bad8 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -29,7 +29,7 @@ kind: "package-reference"
 
 ### 预期行为
 
-会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的纯图标分体按钮。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
+会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。会话标题栏显示“打开”文字，文档标题栏只显示图标。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
 文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
 
diff --git a/packages/host/open-in-app/README.i18n.yaml b/packages/host/open-in-app/README.i18n.yaml
index a0f9b65499..6d300a6296 100644
--- a/packages/host/open-in-app/README.i18n.yaml
+++ b/packages/host/open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/host/open-in-app/README.md
-README.md: 0f0c05f48469a03bc115d84e93a174fbfeba0c42
-README.zh.md: 8a46759a9cc84fdda8ce62c3f448344c86179bb8
+README.md: 39cc7b854725aab363c4c42ad1ab27f99718e75e
+README.zh.md: c47a47c43f3dcf7b842af2bf57469c7b09dc49c9
diff --git a/packages/host/open-in-app/README.md b/packages/host/open-in-app/README.md
index 0f0c05f484..39cc7b8547 100644
--- a/packages/host/open-in-app/README.md
+++ b/packages/host/open-in-app/README.md
@@ -72,6 +72,8 @@ The route paths and wire payload types are published as the browser-safe `./shar
 <a id="understand-the-implementation"></a>
 ## Understand the implementation
 
+Linux desktop-entry fields and icons use the shared [native-command](../../util/native-command/README.md) helpers. Directory launchers come from this package’s installed application catalog; file handlers come from the operating system’s associations.
+
 <details>
 <summary>Implementation internals — click to expand</summary>
 
diff --git a/packages/host/open-in-app/README.zh.md b/packages/host/open-in-app/README.zh.md
index 8a46759a9c..c47a47c43f 100644
--- a/packages/host/open-in-app/README.zh.md
+++ b/packages/host/open-in-app/README.zh.md
@@ -72,6 +72,8 @@ kind: "package-reference"
 <a id="understand-the-implementation"></a>
 ## 理解实现
 
+Linux 桌面文件字段和图标使用共享的 [native-command](../../util/native-command/README.zh.md) 工具。目录打开器来自本包的已安装应用列表，文件打开器来自操作系统的文件关联。
+
 <details>
 <summary>实现内幕——点击展开</summary>
 
diff --git a/packages/util/native-command/README.i18n.yaml b/packages/util/native-command/README.i18n.yaml
index d9fba84086..b2268f1e2d 100644
--- a/packages/util/native-command/README.i18n.yaml
+++ b/packages/util/native-command/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/util/native-command/README.md
-README.md: 8d193855bfb5295b17378312da7d85017867501f
-README.zh.md: 4a2fed91fa8ba0c6ae03ad6f91f296352f93fe87
+README.md: ef9a066e38e584e592196ca4e6c80a266df135ad
+README.zh.md: 33ba66a2718bb5dbda2d5f346d656733eaeb4376
diff --git a/packages/util/native-command/README.md b/packages/util/native-command/README.md
index 8d193855bf..ef9a066e38 100644
--- a/packages/util/native-command/README.md
+++ b/packages/util/native-command/README.md
@@ -49,7 +49,7 @@ The `NativeCommandRunner` type is the injectable command boundary for host integ
 
 `revealNativePath(path, signal)` selects the file in Finder or Explorer, including WSL path translation, and opens its parent directory through `xdg-open` on desktop Linux. `nativeFileManager()` identifies that action for Host-derived UI labels; desktop availability remains a separate `canOpenNativePath()` check. Callers must authorize the absolute file path before invoking either operation. Platform dispatch is covered by injected-runner tests; native desktop verification belongs to the corresponding platform. Explorer receives an encoded file URI as a separate argument. Its exit code 1 is accepted as a delegated handoff; cancellation, missing executables, and other exit codes still reject. This acknowledgement does not prove that a desktop window selected the file.
 
-`nativeFileApplications(path, signal)` queries macOS LaunchServices for the file’s registered handlers, current default, localized names, and PNG application icons. `openNativeFileApplication(path, application, signal)` rechecks membership before launching the selected handler. Callers authorize the local file path. Windows and Linux currently return no handlers; default opening and reveal remain available through the path openers.
+`nativeFileApplications(path, signal)` returns registered applications, localized names, icons, and the current default. macOS uses LaunchServices; Windows uses Shell association handlers; Linux uses GIO with shared XDG desktop-entry and icon lookup. `openNativeFileApplication(path, application, signal)` revalidates the handler without changing the system default. Windows delegates invocation to the Shell, and Linux delegates argument expansion to `gio launch`. WSL translates the path and uses the Windows adapter. Callers authorize the local file path. Native integration tests use private Windows file associations and Linux XDG roots on their respective platforms.
 
 -----
 
@@ -103,6 +103,8 @@ Nothing here enters a request prefix; this package neither assembles nor sends a
 
 <a id="known-limitations-and-deferred-work"></a>
 
+Linux association discovery and explicit launching require GIO. Missing native commands reject the query, and missing artwork returns null; callers can retain file-manager reveal as their fallback.
+
 
 These limits define when this runner is not the right tool. They are current package constraints, not a task backlog.
 
diff --git a/packages/util/native-command/README.zh.md b/packages/util/native-command/README.zh.md
index 4a2fed91fa..33ba66a271 100644
--- a/packages/util/native-command/README.zh.md
+++ b/packages/util/native-command/README.zh.md
@@ -49,7 +49,7 @@ const { stdout, stderr } = await runNativeCommand('osascript', ['-e', script], s
 
 `revealNativePath(path, signal)` 在 Finder 或文件资源管理器中选中文件，包含 WSL 路径转换；在桌面 Linux 上通过 `xdg-open` 打开上层目录。`nativeFileManager()` 标识该操作，供 UI 根据 Host 选择文案；桌面是否可用仍由独立的 `canOpenNativePath()` 检查决定。调用方必须先授权绝对文件路径，再执行操作。平台分派由注入运行器的测试覆盖；原生桌面验证由对应平台负责。 Explorer 接收独立参数中的编码文件 URI。退出码 1 按已转交请求处理；取消、找不到可执行文件和其他退出码仍然报错。该确认不能证明桌面窗口已选中文件。
 
-`nativeFileApplications(path, signal)` 从 macOS LaunchServices 查询文件的关联应用、当前默认应用、本地化名称和 PNG 应用图标。`openNativeFileApplication(path, application, signal)` 在启动指定应用前重新核对关联列表。调用方负责验证本地文件路径。Windows 和 Linux 当前返回空列表；默认打开和文件定位仍由路径打开接口提供。
+`nativeFileApplications(path, signal)` 返回关联应用、本地化名称、图标和当前默认项。macOS 使用 LaunchServices，Windows 使用 Shell 关联处理器，Linux 使用 GIO，并共用 XDG 桌面文件和图标读取逻辑。`openNativeFileApplication(path, application, signal)` 重新验证关联应用，不修改系统默认值。Windows 交给 Shell 启动应用，Linux 交给 `gio launch` 展开参数。WSL 转换路径后使用 Windows 适配器。调用方负责验证本地文件路径。原生集成测试分别在相应平台使用独立的 Windows 文件关联和 Linux XDG 目录。
 
 -----
 
@@ -103,6 +103,8 @@ const { stdout, stderr } = await runNativeCommand('osascript', ['-e', script], s
 
 <a id="known-limitations-and-deferred-work"></a>
 
+Linux 的关联查询和指定应用启动需要 GIO。缺少原生命令时查询失败，缺失的图标返回 null；调用方可以保留文件定位作为备用动作。
+
 
 这些限制说明本运行器何时不是合适的工具。它们是当前包约束，不是任务积压。
 
diff --git a/packages/util/native-command/src/file-applications-windows.ts b/packages/util/native-command/src/file-applications-windows.ts
index 89a0526f6a..a79a76097e 100644
--- a/packages/util/native-command/src/file-applications-windows.ts
+++ b/packages/util/native-command/src/file-applications-windows.ts
@@ -153,7 +153,7 @@ export async function windowsFileApplications(
   const encodedApplication = Buffer.from(application ?? '').toString('base64')
   const script = `$ErrorActionPreference = 'Stop'
 [Console]::OutputEncoding = New-Object System.Text.UTF8Encoding($false)
-Add-Type -ReferencedAssemblies System.Drawing -TypeDefinition @'
+Add-Type -ReferencedAssemblies System,System.Core,System.Drawing -TypeDefinition @'
 ${WINDOWS_ASSOCIATIONS}
 '@
 $path = [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${encodedPath}'))

From 4fb9d34275bb1658aaee664ed51dcdeccc02ed9e Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:32:05 +0800
Subject: [PATCH 23/62] fix: use the native test task timeout for fixture
 readiness

---
 .../tests/file-applications-linux-native.spec.ts            | 6 +++---
 .../native-command/tests/file-applications-windows.spec.ts  | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/util/native-command/tests/file-applications-linux-native.spec.ts b/packages/util/native-command/tests/file-applications-linux-native.spec.ts
index 4d40b05770..42cc4083cf 100644
--- a/packages/util/native-command/tests/file-applications-linux-native.spec.ts
+++ b/packages/util/native-command/tests/file-applications-linux-native.spec.ts
@@ -16,7 +16,7 @@ function quoted(value: string): string {
   return `"${value.replace(/[\\"`$]/g, match => `\\${match}`)}"`
 }
 
-it.skipIf(!gioAvailable)('queries and launches an installed Linux desktop entry through GIO', async () => {
+it.skipIf(!gioAvailable)('queries and launches an installed Linux desktop entry through GIO', async ({ task }) => {
   const root = await mkdtemp(join(tmpdir(), 'dsh-gio-associations-'))
   const lifetime = new AbortController()
   const active = new Set<Promise<Awaited<ReturnType<NativeCommandRunner>>>>()
@@ -54,6 +54,6 @@ it.skipIf(!gioAvailable)('queries and launches an installed Linux desktop entry
   await vi.waitFor(async () => {
     opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
     expect(opened.path).toBe(path)
-  }, { timeout: vi.getConfig().testTimeout })
-  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: vi.getConfig().testTimeout })
+  }, { timeout: task.timeout })
+  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: task.timeout })
 })
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index b0d297aa90..c39c904a10 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -12,7 +12,7 @@ function literal(value: string): string {
   return `[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${Buffer.from(value).toString('base64')}'))`
 }
 
-it.skipIf(process.platform !== 'win32')('queries and invokes a registered Windows handler through the system Shell', async () => {
+it.skipIf(process.platform !== 'win32')('queries and invokes a registered Windows handler through the system Shell', async ({ task }) => {
   const root = await mkdtemp(join(tmpdir(), 'dsh-windows-association-'))
   const suffix = randomUUID().replaceAll('-', '')
   const extension = `.dsh${suffix}`
@@ -61,7 +61,7 @@ $key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Di
   await vi.waitFor(async () => {
     opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
     expect(opened.path).toBe(path)
-  }, { timeout: vi.getConfig().testTimeout })
+  }, { timeout: task.timeout })
   // Shell invocation does not own the application's lifetime; wait for this fixture's process to exit before removing its files.
-  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: vi.getConfig().testTimeout })
+  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: task.timeout })
 })

From 521895836609337eacf95a96b35bddbd19b71701 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:35:53 +0800
Subject: [PATCH 24/62] test: keep native association expectations strictly
 typed

---
 .../util/native-command/tests/file-applications-linux.spec.ts | 2 +-
 .../native-command/tests/file-applications-windows.spec.ts    | 2 +-
 packages/util/native-command/tests/file-applications.spec.ts  | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/util/native-command/tests/file-applications-linux.spec.ts b/packages/util/native-command/tests/file-applications-linux.spec.ts
index 366dbbfa63..7615218f3b 100644
--- a/packages/util/native-command/tests/file-applications-linux.spec.ts
+++ b/packages/util/native-command/tests/file-applications-linux.spec.ts
@@ -27,7 +27,7 @@ it('deduplicates GIO handlers, resolves nested ids, localizes names, and reuses
   const signal = new AbortController().signal
   const apps = await nativeFileApplications('/file.mp3', signal, facts)
   expect(apps).toEqual([
-    { id: join(root, 'applications', 'player.desktop'), name: '播放器', default: true, icon: expect.stringMatching(/^data:image\/svg\+xml;base64,/) },
+    { id: join(root, 'applications', 'player.desktop'), name: '播放器', default: true, icon: expect.stringMatching(/^data:image\/svg\+xml;base64,/) as string },
     { id: join(root, 'applications', 'nested', 'other.desktop'), name: 'Other', default: false, icon: null },
   ])
   await openNativeFileApplication('/file.mp3', apps[0]!.id, signal, facts)
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index c39c904a10..901a84f6d5 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -55,7 +55,7 @@ $key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Di
 `)
   const applications = await nativeFileApplications(path, lifetime.signal, { run })
   const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
-  expect(expected).toMatchObject({ default: true, name: expect.any(String) })
+  expect(expected).toMatchObject({ default: true, name: expect.any(String) as string })
   await openNativeFileApplication(path, expected!.id, lifetime.signal, { run })
   let opened: { path: string; pid: number } | undefined
   await vi.waitFor(async () => {
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index ffe70ba857..43c447fe1d 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -53,12 +53,12 @@ it('encodes Windows query and invocation data separately from native adapter sou
   const run = vi.fn<runner.NativeCommandRunner>(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
   const path = "C:\\测试\\a'; write-host nope.mp3"
   expect(await nativeFileApplications(path, signal, { platform: 'win32', run })).toEqual([application])
-  const query = Buffer.from(run.mock.calls[0]![1]!.at(-1)!, 'base64').toString('utf16le')
+  const query = Buffer.from(run.mock.calls[0]![1].at(-1)!, 'base64').toString('utf16le')
   expect(query).toContain(Buffer.from(path).toString('base64'))
   expect(query).not.toContain(path)
   expect(query).toContain('::List($path)')
   await openNativeFileApplication(path, application.id, signal, { platform: 'win32', run })
-  expect(Buffer.from(run.mock.calls[1]![1]!.at(-1)!, 'base64').toString('utf16le')).toContain('::Open($path, $application)')
+  expect(Buffer.from(run.mock.calls[1]![1].at(-1)!, 'base64').toString('utf16le')).toContain('::Open($path, $application)')
   expect(run.mock.calls[1]![0]).toBe('powershell.exe')
 })
 

From cbc51b5446436495c327ad43f3c00e71d41bbc07 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:51:18 +0800
Subject: [PATCH 25/62] test: isolate native application identity and
 cold-history associations

---
 apps/web/tests/seeded-history.e2e.ts          | 10 ++-
 .../src/file-applications-windows.ts          |  2 +-
 .../tests/file-applications-windows.spec.ts   | 83 ++++++++++++++-----
 .../seeded-history/file-preview.expected.md   |  2 +-
 4 files changed, 72 insertions(+), 25 deletions(-)

diff --git a/apps/web/tests/seeded-history.e2e.ts b/apps/web/tests/seeded-history.e2e.ts
index b31b33bba0..6ebe9bf889 100644
--- a/apps/web/tests/seeded-history.e2e.ts
+++ b/apps/web/tests/seeded-history.e2e.ts
@@ -228,6 +228,13 @@ describe('web e2e: seeded history renders through cold resume', () => {
       ],
       openInAppEnvironment: createLaunchEnvironmentSnapshot([{ source: 'process', values: { SSH_CONNECTION: '10.0.0.2 55000 10.0.0.9 22' } }]),
     })
+    // Application registrations belong to the host desktop, not to the recorded Session.
+    const controller = scaffold.ctx.get('sessionController')
+    if (controller === undefined) throw new Error('seeded-history requires Session Controller')
+    const nativeQuery: unknown = Reflect.get(controller, 'fileApplications')
+    if (typeof nativeQuery !== 'function') throw new Error('seeded-history requires the native file-association adapter')
+    Reflect.set(controller, 'fileApplications', async () => [])
+    scaffold.ctx.effect(() => () => { Reflect.set(controller, 'fileApplications', nativeQuery) }, 'seeded-history: native association fixture')
     // Composer recording uses a child workspace; seedSession owns the scaffold root.
     const sessionCwd = MODE === 'record' ? join(scaffold.workspaceCwd, 'workspace') : scaffold.workspaceCwd
     await mkdir(sessionCwd, { recursive: true })
@@ -518,7 +525,8 @@ describe('web e2e: seeded history renders through cold resume', () => {
       await expect.poll(() => path.textContent()).toBe(absolutePath)
       expect(await path.getAttribute('title')).toBe(absolutePath)
       await expect.poll(() => column.locator('[data-textpreview-line="1"]').textContent()).toBe('alpha\n')
-      await column.locator('[data-open-path-open]').waitFor({ timeout: 5_000 })
+      await column.getByRole('button', { name: 'Show file location', exact: true }).waitFor({ timeout: 5_000 })
+      await expect.poll(() => column.locator('[data-open-path-open]').isEnabled()).toBe(true)
       const preview = await captureStableAria(page, '[data-textpreview-state="text"]', scaffold.workspaceCwd)
       await compareOrRefreshGolden(FILE_PREVIEW_EXPECTED, preview, MODE)
     } finally {
diff --git a/packages/util/native-command/src/file-applications-windows.ts b/packages/util/native-command/src/file-applications-windows.ts
index a79a76097e..1337b7bac8 100644
--- a/packages/util/native-command/src/file-applications-windows.ts
+++ b/packages/util/native-command/src/file-applications-windows.ts
@@ -94,7 +94,7 @@ public static class DshFileAssociations {
         IHandler handler; uint fetched;
         int result = handlers.Next(1, out handler, out fetched);
         Marshal.ThrowExceptionForHR(result);
-        if (fetched == 0) break;
+        if (result != 0 || fetched == 0) break;
         try { visit(handler); } finally { Marshal.FinalReleaseComObject(handler); }
       }
     } finally { Marshal.FinalReleaseComObject(handlers); }
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index 901a84f6d5..8299abb02f 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -1,4 +1,4 @@
-/** Real Windows Shell discovery and invocation with a private file extension and a short-lived fixture application. */
+/** Real Windows Shell discovery and invocation with a private extension and a private executable. */
 import { randomUUID } from 'node:crypto'
 import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
@@ -12,24 +12,31 @@ function literal(value: string): string {
   return `[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('${Buffer.from(value).toString('base64')}'))`
 }
 
-it.skipIf(process.platform !== 'win32')('queries and invokes a registered Windows handler through the system Shell', async ({ task }) => {
+it.skipIf(process.platform !== 'win32')('queries and invokes a registered Windows handler through the system Shell', async ({ task, signal: testSignal, onTestFailed }) => {
   const root = await mkdtemp(join(tmpdir(), 'dsh-windows-association-'))
   const suffix = randomUUID().replaceAll('-', '')
   const extension = `.dsh${suffix}`
   const progId = `DSH.Test.${suffix}`
-  const path = join(root, `测试 ' audio${extension}`)
-  const marker = join(root, 'opened.json')
-  const script = join(root, 'handler.cjs')
+  const appName = `dsh-handler-${suffix}.exe`
+  const executable = join(root, appName)
+  const path = join(root, `${String.fromCharCode(0x6d4b, 0x8bd5)} ' audio${extension}`)
+  const marker = join(root, 'opened.txt')
   const lifetime = new AbortController()
+  const signal = AbortSignal.any([testSignal, lifetime.signal])
   const active = new Set<Promise<Awaited<ReturnType<NativeCommandRunner>>>>()
-  const run: NativeCommandRunner = (command, args, signal) => {
-    const task = runNativeCommand(command, args, signal)
-    active.add(task)
-    void task.then(() => active.delete(task), () => active.delete(task))
-    return task
+  let phase = 'compile fixture'
+  onTestFailed(async () => {
+    const opened = await readFile(marker, 'utf8').catch(() => '(no handoff marker)')
+    console.error('Windows association fixture:', phase, 'active native commands:', active.size, opened)
+  })
+  const run: NativeCommandRunner = (command, args, operationSignal) => {
+    const pending = runNativeCommand(command, args, operationSignal)
+    active.add(pending)
+    void pending.then(() => active.delete(pending), () => active.delete(pending))
+    return pending
   }
   const runScript = async (source: string): Promise<void> => {
-    await run('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], lifetime.signal)
+    await run('powershell.exe', ['-NoProfile', '-NonInteractive', '-EncodedCommand', Buffer.from(source, 'utf16le').toString('base64')], signal)
   }
   onTestFinished(async () => {
     lifetime.abort()
@@ -39,11 +46,26 @@ it.skipIf(process.platform !== 'win32')('queries and invokes a registered Window
 $root = [Microsoft.Win32.Registry]::CurrentUser
 $root.DeleteSubKeyTree('Software\\Classes\\${extension}', $false)
 $root.DeleteSubKeyTree('Software\\Classes\\${progId}', $false)
+$root.DeleteSubKeyTree('Software\\Classes\\Applications\\${appName}', $false)
 `, 'utf16le').toString('base64')], new AbortController().signal)
     } finally { await rm(root, { recursive: true, force: true }) }
   })
   await writeFile(path, 'test')
-  await writeFile(script, `require('node:fs').writeFileSync(${JSON.stringify(marker)}, JSON.stringify({ path: process.argv[2], pid: process.pid }));\n`)
+  // A dedicated executable accepts the file directly; no pre-existing Node association can discard fixture-script arguments.
+  await runScript(`$ErrorActionPreference = 'Stop'
+Add-Type -ReferencedAssemblies System -OutputAssembly ${literal(executable)} -OutputType ConsoleApplication -TypeDefinition @'
+using System;
+using System.IO;
+using System.Diagnostics;
+public static class Handler {
+  public static void Main(string[] args) {
+    File.WriteAllLines(${JSON.stringify(marker)}, new string[] { args[0], Process.GetCurrentProcess().Id.ToString() });
+  }
+}
+'@
+`)
+  phase = 'register association'
+  const command = literal(`"${executable}" "%1"`)
   await runScript(`$ErrorActionPreference = 'Stop'
 $root = [Microsoft.Win32.Registry]::CurrentUser
 $key = $root.CreateSubKey('Software\\Classes\\${extension}')
@@ -51,17 +73,34 @@ $key.SetValue('', '${progId}'); $key.Dispose()
 $key = $root.CreateSubKey('Software\\Classes\\${extension}\\OpenWithProgids')
 $key.SetValue('${progId}', ''); $key.Dispose()
 $key = $root.CreateSubKey('Software\\Classes\\${progId}\\shell\\open\\command')
-$key.SetValue('', ${literal(`"${process.execPath}" "${script}" "%1"`)}); $key.Dispose()
+$key.SetValue('', ${command}); $key.Dispose()
+$key = $root.CreateSubKey('Software\\Classes\\Applications\\${appName}\\shell\\open\\command')
+$key.SetValue('', ${command}); $key.Dispose()
+$key = $root.CreateSubKey('Software\\Classes\\Applications\\${appName}\\SupportedTypes')
+$key.SetValue('${extension}', ''); $key.Dispose()
 `)
-  const applications = await nativeFileApplications(path, lifetime.signal, { run })
-  const expected = applications.find(app => app.id.toLowerCase() === process.execPath.toLowerCase())
+  phase = 'query associations'
+  const applications = await nativeFileApplications(path, signal, { run })
+  const expected = applications.find(app => app.id.toLowerCase() === executable.toLowerCase())
   expect(expected).toMatchObject({ default: true, name: expect.any(String) as string })
-  await openNativeFileApplication(path, expected!.id, lifetime.signal, { run })
-  let opened: { path: string; pid: number } | undefined
-  await vi.waitFor(async () => {
-    opened = JSON.parse(await readFile(marker, 'utf8')) as { path: string; pid: number }
-    expect(opened.path).toBe(path)
+  phase = 'invoke handler'
+  await openNativeFileApplication(path, expected!.id, signal, { run })
+  phase = 'wait for fixture marker'
+  let opened: string[] = []
+  await vi.waitUntil(async () => {
+    signal.throwIfAborted()
+    try { opened = (await readFile(marker, 'utf8')).trim().split(/\r?\n/) } catch (_error) { return false }
+    return true
+  }, { timeout: task.timeout })
+  expect(opened[0]).toBe(path)
+  const pid = Number(opened[1])
+  expect(pid).toBeGreaterThan(0)
+  phase = 'wait for fixture exit'
+  await vi.waitUntil(() => {
+    signal.throwIfAborted()
+    try { process.kill(pid, 0); return false } catch (error) {
+      if (typeof error === 'object' && error !== null && 'code' in error && error.code === 'ESRCH') return true
+      throw error
+    }
   }, { timeout: task.timeout })
-  // Shell invocation does not own the application's lifetime; wait for this fixture's process to exit before removing its files.
-  await vi.waitFor(() => { expect(() => process.kill(opened!.pid, 0)).toThrow() }, { timeout: task.timeout })
 })
diff --git a/snapshots/web/seeded-history/file-preview.expected.md b/snapshots/web/seeded-history/file-preview.expected.md
index 197bb3c9cf..d100691da1 100644
--- a/snapshots/web/seeded-history/file-preview.expected.md
+++ b/snapshots/web/seeded-history/file-preview.expected.md
@@ -1,6 +1,6 @@
 - text: {{cwd}}/a.txt
 - button "Line wrap" [pressed]
 - button "Read the file again"
-- button "Open"
+- button "Show file location"
 - button "More ways to open"
 - text: alpha

From 39af5179612d94b64a198f874ac91c6471cca720 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 12:58:58 +0800
Subject: [PATCH 26/62] test: evaluate the Windows fixture output path as a
 PowerShell expression

---
 .../util/native-command/tests/file-applications-windows.spec.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index 8299abb02f..e97ee40132 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -53,7 +53,7 @@ $root.DeleteSubKeyTree('Software\\Classes\\Applications\\${appName}', $false)
   await writeFile(path, 'test')
   // A dedicated executable accepts the file directly; no pre-existing Node association can discard fixture-script arguments.
   await runScript(`$ErrorActionPreference = 'Stop'
-Add-Type -ReferencedAssemblies System -OutputAssembly ${literal(executable)} -OutputType ConsoleApplication -TypeDefinition @'
+Add-Type -ReferencedAssemblies System -OutputAssembly (${literal(executable)}) -OutputType ConsoleApplication -TypeDefinition @'
 using System;
 using System.IO;
 using System.Diagnostics;

From 6493cdac9c628cd28adaa46efc31e98b8699a874 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:14:49 +0800
Subject: [PATCH 27/62] fix: retain the Windows Shell host until asynchronous
 handoff settles

---
 .../src/file-applications-windows.ts          | 65 +++++++++++++++++++
 .../tests/file-applications-windows.spec.ts   |  6 +-
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/packages/util/native-command/src/file-applications-windows.ts b/packages/util/native-command/src/file-applications-windows.ts
index 1337b7bac8..64b4290551 100644
--- a/packages/util/native-command/src/file-applications-windows.ts
+++ b/packages/util/native-command/src/file-applications-windows.ts
@@ -42,6 +42,68 @@ public static class DshFileAssociations {
   [DllImport("user32.dll")]
   static extern bool DestroyIcon(IntPtr icon);
 
+  [DllImport("shlwapi.dll", PreserveSig = false)]
+  static extern void SHCreateThreadRef(IntPtr count, out IntPtr reference);
+  [DllImport("shlwapi.dll", PreserveSig = false)]
+  static extern void SHSetThreadRef(IntPtr reference);
+  [DllImport("shell32.dll")]
+  static extern void SHSetInstanceExplorer(IntPtr reference);
+  [StructLayout(LayoutKind.Sequential)]
+  struct Message {
+    public IntPtr window;
+    public uint message;
+    public UIntPtr wParam;
+    public IntPtr lParam;
+    public uint time;
+    public int x, y;
+    public uint reserved;
+  }
+  [DllImport("user32.dll", SetLastError = true)]
+  static extern UIntPtr SetTimer(IntPtr window, UIntPtr id, uint milliseconds, IntPtr callback);
+  [DllImport("user32.dll")]
+  static extern bool KillTimer(IntPtr window, UIntPtr id);
+  [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+  static extern int GetMessage(out Message message, IntPtr window, uint min, uint max);
+  [DllImport("user32.dll")]
+  static extern bool TranslateMessage(ref Message message);
+  [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+  static extern IntPtr DispatchMessage(ref Message message);
+
+  // Shell handlers may return before their asynchronous launch work releases the host.
+  // The shared Shell reference, rather than an arbitrary delay, owns that lifetime.
+  static void WithShellLifetime(Action action) {
+    IntPtr count = Marshal.AllocHGlobal(sizeof(int));
+    IntPtr reference = IntPtr.Zero;
+    try {
+      Marshal.WriteInt32(count, 0);
+      SHCreateThreadRef(count, out reference);
+      SHSetThreadRef(reference);
+      SHSetInstanceExplorer(reference);
+      int owned = Marshal.ReadInt32(count);
+      try { action(); }
+      finally {
+        if (Marshal.ReadInt32(count) > owned) {
+          // USER_TIMER_MINIMUM wakes the STA to inspect the reference count while dispatching COM work.
+          UIntPtr timer = SetTimer(IntPtr.Zero, UIntPtr.Zero, 10, IntPtr.Zero);
+          if (timer == UIntPtr.Zero) throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
+          try {
+            while (Marshal.ReadInt32(count) > owned) {
+              Message message;
+              if (GetMessage(out message, IntPtr.Zero, 0, 0) <= 0) throw new InvalidOperationException("Shell handoff message loop ended");
+              TranslateMessage(ref message);
+              DispatchMessage(ref message);
+            }
+          } finally { KillTimer(IntPtr.Zero, timer); }
+        }
+      }
+    } finally {
+      SHSetInstanceExplorer(IntPtr.Zero);
+      SHSetThreadRef(IntPtr.Zero);
+      if (reference != IntPtr.Zero) Marshal.Release(reference);
+      Marshal.FreeHGlobal(count);
+    }
+  }
+
   public sealed class Application {
     public string id;
     public string name;
@@ -115,6 +177,9 @@ public static class DshFileAssociations {
     return apps.ToArray();
   }
   public static void Open(string path, string application) {
+    WithShellLifetime(delegate { OpenRegistered(path, application); });
+  }
+  static void OpenRegistered(string path, string application) {
     bool opened = false;
     Visit(path, delegate(IHandler handler) {
       string id; handler.GetName(out id);
diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index e97ee40132..0d093881e7 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -59,11 +59,15 @@ using System.IO;
 using System.Diagnostics;
 public static class Handler {
   public static void Main(string[] args) {
-    File.WriteAllLines(${JSON.stringify(marker)}, new string[] { args[0], Process.GetCurrentProcess().Id.ToString() });
+    File.WriteAllLines(${JSON.stringify(marker)}, new string[] { args.Length == 0 ? "(no file argument)" : args[0], Process.GetCurrentProcess().Id.ToString() });
   }
 }
 '@
 `)
+  phase = 'verify fixture executable'
+  await run(executable, [path], signal)
+  expect((await readFile(marker, 'utf8')).split(/\r?\n/)[0]).toBe(path)
+  await rm(marker)
   phase = 'register association'
   const command = literal(`"${executable}" "%1"`)
   await runScript(`$ErrorActionPreference = 'Stop'

From 27b7fd0e2fae2f2a825a35fbe7e0df31b4aa17df Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:26:18 +0800
Subject: [PATCH 28/62] fix: preserve Shell reference storage during failed
 handoff cleanup

---
 packages/util/native-command/README.i18n.yaml                | 4 ++--
 packages/util/native-command/README.md                       | 2 +-
 packages/util/native-command/README.zh.md                    | 2 +-
 .../util/native-command/src/file-applications-windows.ts     | 5 +++--
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/packages/util/native-command/README.i18n.yaml b/packages/util/native-command/README.i18n.yaml
index b2268f1e2d..cbfe2d6fb6 100644
--- a/packages/util/native-command/README.i18n.yaml
+++ b/packages/util/native-command/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/util/native-command/README.md
-README.md: ef9a066e38e584e592196ca4e6c80a266df135ad
-README.zh.md: 33ba66a2718bb5dbda2d5f346d656733eaeb4376
+README.md: ca820c4bc6c3ccdc9a54d4392176eb382ce5ae12
+README.zh.md: a948befc487c624d88426b27d15ecb0a91a8f813
diff --git a/packages/util/native-command/README.md b/packages/util/native-command/README.md
index ef9a066e38..ca820c4bc6 100644
--- a/packages/util/native-command/README.md
+++ b/packages/util/native-command/README.md
@@ -108,7 +108,7 @@ Linux association discovery and explicit launching require GIO. Missing native c
 
 These limits define when this runner is not the right tool. They are current package constraints, not a task backlog.
 
-- **No output bounding** — both streams buffer unbounded in memory; every current caller invokes small native tools whose output is a path or an error line. Adopt `dsh-output-retention` bounding before pointing this at commands with meaningful output volume.
+- Command output uses Node’s `execFile` buffer limit; oversized replies reject. Use the subprocess capability for streaming output.
 
 <a id="dev-note"></a>
 ### Dev Note
diff --git a/packages/util/native-command/README.zh.md b/packages/util/native-command/README.zh.md
index 33ba66a271..a948befc48 100644
--- a/packages/util/native-command/README.zh.md
+++ b/packages/util/native-command/README.zh.md
@@ -108,7 +108,7 @@ Linux 的关联查询和指定应用启动需要 GIO。缺少原生命令时查
 
 这些限制说明本运行器何时不是合适的工具。它们是当前包约束，不是任务积压。
 
-- **不做输出限量**——两路流在内存中无界缓冲；当前每个调用方只运行输出为一个路径或一行错误的小型原生工具。把它指向输出量可观的命令之前，先接入 `dsh-output-retention` 限量。
+- 命令输出受 Node 的 `execFile` 缓冲上限约束，超过上限时拒绝结果。流式输出由 subprocess 能力处理。
 
 <a id="dev-note"></a>
 ### 开发备注
diff --git a/packages/util/native-command/src/file-applications-windows.ts b/packages/util/native-command/src/file-applications-windows.ts
index 64b4290551..a468c9979c 100644
--- a/packages/util/native-command/src/file-applications-windows.ts
+++ b/packages/util/native-command/src/file-applications-windows.ts
@@ -99,8 +99,9 @@ public static class DshFileAssociations {
     } finally {
       SHSetInstanceExplorer(IntPtr.Zero);
       SHSetThreadRef(IntPtr.Zero);
-      if (reference != IntPtr.Zero) Marshal.Release(reference);
-      Marshal.FreeHGlobal(count);
+      int remaining = reference == IntPtr.Zero ? 0 : Marshal.Release(reference);
+      // An interrupted drain leaves its counter owned by the terminating helper process.
+      if (remaining == 0) Marshal.FreeHGlobal(count);
     }
   }
 

From 6e260998c9d4a27d94318c9f19e74ece69dbadb1 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:39:11 +0800
Subject: [PATCH 29/62] fix: refine shared file controls and native query
 errors

---
 docs/subsystems/session.i18n.yaml             |  4 +-
 docs/subsystems/session.md                    |  1 +
 docs/subsystems/session.zh.md                 |  1 +
 packages/api/session-controller/src/index.ts  | 34 +++++----
 packages/api/session-controller/src/types.ts  |  4 +-
 .../session-open-workspace-path.host.spec.ts  | 35 +++++++--
 .../session-controller/tests/test-remote.ts   |  9 ++-
 .../session-controller/tsconfig.client.json   | 76 +++++--------------
 .../client/ui-open-in-app/README.i18n.yaml    |  4 +-
 packages/client/ui-open-in-app/README.md      |  4 +-
 packages/client/ui-open-in-app/README.zh.md   |  4 +-
 .../src/client/OpenInAppAction.tsx            |  2 +-
 .../src/client/OpenTargetButton.tsx           |  5 +-
 .../ui-open-in-app/src/client/open-path.ts    | 11 +--
 .../tests/open-in-app-action.client.spec.tsx  |  8 +-
 .../extensions/tool-cordis/src/api-catalog.ts |  1 +
 packages/util/native-command/README.i18n.yaml |  4 +-
 packages/util/native-command/README.md        |  2 +-
 packages/util/native-command/README.zh.md     |  2 +-
 .../native-command/src/file-applications.ts   | 34 +++++----
 packages/util/native-command/src/index.ts     |  2 +-
 .../tests/file-applications.spec.ts           |  3 +-
 22 files changed, 127 insertions(+), 123 deletions(-)

diff --git a/docs/subsystems/session.i18n.yaml b/docs/subsystems/session.i18n.yaml
index 15e84bb5d7..878b270089 100644
--- a/docs/subsystems/session.i18n.yaml
+++ b/docs/subsystems/session.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/subsystems/session.md
-session.md: 5c8d27167fb95e4ab2da952ea6edb47aa6afd99b
-session.zh.md: b9e7299689d535f56b48e53fd4b2dff152b3b78f
+session.md: be48d4833bacbac31f3765e0b4d9cdcf6da9f4d7
+session.zh.md: 093fc6d570e93dc5be42d8779fc4d5965085b7e0
diff --git a/docs/subsystems/session.md b/docs/subsystems/session.md
index 5c8d27167f..be48d4833b 100644
--- a/docs/subsystems/session.md
+++ b/docs/subsystems/session.md
@@ -852,6 +852,7 @@ workspaceDesktop(): { name: string; available: boolean; fileManager: 'finder' |
  * @param request - file path in Host filesystem syntax.
  * @param signal - caller lifetime, propagated to filesystem and desktop queries.
  * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+ * @throws RemoteError when the path is invalid, the query is cancelled, or native discovery fails.
  */
 @Remote('workspacePathApplications') async workspacePathApplications( request: { readonly path: string }, signal: AbortSignal, ): Promise<readonly SessionWorkspacePathApplication[]>
 
diff --git a/docs/subsystems/session.zh.md b/docs/subsystems/session.zh.md
index b9e7299689..093fc6d570 100644
--- a/docs/subsystems/session.zh.md
+++ b/docs/subsystems/session.zh.md
@@ -856,6 +856,7 @@ workspaceDesktop(): { name: string; available: boolean; fileManager: 'finder' |
  * @param request - file path in Host filesystem syntax.
  * @param signal - caller lifetime, propagated to filesystem and desktop queries.
  * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+ * @throws RemoteError when the path is invalid, the query is cancelled, or native discovery fails.
  */
 @Remote('workspacePathApplications') async workspacePathApplications( request: { readonly path: string }, signal: AbortSignal, ): Promise<readonly SessionWorkspacePathApplication[]>
 
diff --git a/packages/api/session-controller/src/index.ts b/packages/api/session-controller/src/index.ts
index 0658b01127..a9750a635f 100644
--- a/packages/api/session-controller/src/index.ts
+++ b/packages/api/session-controller/src/index.ts
@@ -84,8 +84,9 @@ export interface Config {
 export interface SessionControllerInternals {
   /** Native default-application handoff. */
   readonly openPath?: (path: string, signal: AbortSignal) => Promise<void>
-  /** Native file-association query and explicit application handoff. */
+  /** Native file-association query. */
   readonly fileApplications?: typeof nativeFileApplications
+  /** Explicit registered-application handoff. */
   readonly openFileApplication?: typeof openNativeFileApplication
   /** Native file-manager handoff. */
   readonly revealPath?: (path: string, signal: AbortSignal) => Promise<void>
@@ -317,22 +318,15 @@ export class SessionController extends TypertRemoteService {
     request: SessionOpenWorkspacePathRequest,
     signal: AbortSignal,
   ): Promise<SessionOpenWorkspacePathValue> {
-    if (request.path.length === 0) {
-      throw new RemoteError(
-        'gateway/bad-request',
-        'session.openWorkspacePath requires a non-empty path',
-        {},
-      )
-    }
-    signal.throwIfAborted()
     try {
-      await this.verifyDesktopPath(request.path, signal)
-      if (request.action === 'reveal') await this.revealPath(request.path, signal)
-      else if (request.application !== undefined) await this.openFileApplication(resolve(request.path), request.application, signal)
-      else await this.openPath(request.path, signal)
+      const path = await this.verifyDesktopPath(request.path, signal)
+      if (request.action === 'reveal') await this.revealPath(path, signal)
+      else if (request.application !== undefined) await this.openFileApplication(path, request.application, signal)
+      else await this.openPath(path, signal)
       return { opened: true }
     } catch (error: unknown) {
       if (signal.aborted) throw new RemoteError('gateway/cancelled', 'path open was aborted', {})
+      if (error instanceof RemoteError) throw error
       throw new RemoteError(
         'gateway/internal',
         `path open failed: ${error instanceof Error ? error.message : String(error)}`,
@@ -346,17 +340,24 @@ export class SessionController extends TypertRemoteService {
    * @param request - file path in Host filesystem syntax.
    * @param signal - caller lifetime, propagated to filesystem and desktop queries.
    * @returns OS application names, icons, and default selection; empty when desktop opening is unavailable.
+   * @throws RemoteError when the path is invalid, the query is cancelled, or native discovery fails.
    */
   @Remote('workspacePathApplications')
   async workspacePathApplications(
     request: { readonly path: string }, signal: AbortSignal,
   ): Promise<readonly SessionWorkspacePathApplication[]> {
     if (!this.canOpenPath()) return []
-    await this.verifyDesktopPath(request.path, signal)
-    return this.fileApplications(resolve(request.path), signal)
+    try {
+      const path = await this.verifyDesktopPath(request.path, signal)
+      return await this.fileApplications(path, signal)
+    } catch (error: unknown) {
+      if (signal.aborted) throw new RemoteError('gateway/cancelled', 'application query was aborted', {})
+      if (error instanceof RemoteError) throw error
+      throw new RemoteError('gateway/internal', 'file application query failed', {}, { cause: error })
+    }
   }
 
-  private async verifyDesktopPath(path: string, signal: AbortSignal): Promise<void> {
+  private async verifyDesktopPath(path: string, signal: AbortSignal): Promise<string> {
     if (path.length === 0) throw new RemoteError('gateway/bad-request', 'A non-empty file path is required', {})
     signal.throwIfAborted()
     const hostPath = resolve(path)
@@ -366,6 +367,7 @@ export class SessionController extends TypertRemoteService {
       throw new RemoteError('gateway/bad-request', 'Path has no verified Host path', {})
     }
     signal.throwIfAborted()
+    return hostPath
   }
 
   /**
diff --git a/packages/api/session-controller/src/types.ts b/packages/api/session-controller/src/types.ts
index 9cca55d152..18fa2d80a6 100644
--- a/packages/api/session-controller/src/types.ts
+++ b/packages/api/session-controller/src/types.ts
@@ -1,5 +1,5 @@
-import type { NativeFileApplication } from '@deepseek-ai/dsh-native-command/types'
 /** Browser-safe request, result, and lifecycle vocabulary for the Session Remote service. */
+import type { NativeFileApplication } from '@deepseek-ai/dsh-native-command/types'
 
 import type {
   AttachmentIdType, ImageAttachmentLimits, ImageAttachmentRef, ImageMediaType,
@@ -382,7 +382,7 @@ export interface SessionCancelValue {
 export interface SessionOpenWorkspacePathRequest {
   /** File-manager navigation when requested; omission uses the default application. */
   readonly action?: 'reveal'
-  /** Registered application path; omission preserves the operating system default. */
+  /** Registered application identifier; ignored for reveal. Omission preserves the operating system default. */
   readonly application?: string
   /** Path after best-effort Session workspace resolution, in Host filesystem syntax. */
   readonly path: string
diff --git a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
index aaa23c11a0..93f51c7ce3 100644
--- a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
+++ b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
@@ -1,3 +1,4 @@
+import { resolve } from 'node:path'
 import * as nativeCommand from '@deepseek-ai/dsh-native-command'
 import { Context } from '@deepseek-ai/cordis'
 import AgentRegistry from '@deepseek-ai/dsh-agent'
@@ -65,11 +66,11 @@ describe('session/openWorkspacePath', () => {
 
     await expect(remote.openWorkspacePath({ path: '/workspace/project/src/a.ts' }, signal))
       .resolves.toEqual({ ok: true, value: { opened: true } })
-    expect(openPath).toHaveBeenCalledWith('/workspace/project/src/a.ts', signal)
+    expect(openPath).toHaveBeenCalledWith(resolve('/workspace/project/src/a.ts'), signal)
     expect(ctx.agents.list()).toEqual([])
   })
 
-  it('preserves relative and absolute Host-resolvable paths', async () => {
+  it('normalizes relative and absolute Host-resolvable paths', async () => {
     const ctx = await context()
     const openPath = vi.fn((_path: string, _signal: AbortSignal) => Promise.resolve())
     const remote = createSessionTestRemote(ctx, {
@@ -80,7 +81,7 @@ describe('session/openWorkspacePath', () => {
 
     await remote.openWorkspacePath({ path: '/workspace/result.html' })
     await remote.openWorkspacePath({ path: 'result.html' })
-    expect(openPath.mock.calls.map(call => call[0])).toEqual(['/workspace/result.html', 'result.html'])
+    expect(openPath.mock.calls.map(call => call[0])).toEqual([resolve('/workspace/result.html'), resolve('result.html')])
   })
 
   it('rejects empty paths before opening anything', async () => {
@@ -156,7 +157,7 @@ it('reports Host file-manager metadata and dispatches reveal separately from def
     expect(controller.workspaceDesktop()).toMatchObject({ available: true, name: expect.any(String) as string })
     const signal = new AbortController().signal
     await controller.openWorkspacePath({ path: '/workspace/report.txt', action: 'reveal' }, signal)
-    expect(revealPath).toHaveBeenCalledWith('/workspace/report.txt', signal)
+    expect(revealPath).toHaveBeenCalledWith(resolve('/workspace/report.txt'), signal)
     expect(openPath).not.toHaveBeenCalled()
   } finally { await ctx.fiber.dispose() }
 })
@@ -186,7 +187,7 @@ it.each(['open', 'reveal'] as const)('rejects an unmapped remote path before nat
     defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', openPath, revealPath,
   })
   await expect(controller.openWorkspacePath({ path: '/remote/report.html', ...(action === 'reveal' ? { action } : {}) }, new AbortController().signal))
-    .rejects.toMatchObject({ code: 'gateway/internal', message: 'path open failed: Path has no verified Host path' })
+    .rejects.toMatchObject({ code: 'gateway/bad-request', message: 'Path has no verified Host path' })
   expect(openPath).not.toHaveBeenCalled()
   expect(revealPath).not.toHaveBeenCalled()
 })
@@ -200,7 +201,7 @@ it('rejects a filesystem mapping that resolves to another process path', async (
     defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', openPath,
   })
   await expect(controller.openWorkspacePath({ path: '/report.html' }, new AbortController().signal))
-    .rejects.toMatchObject({ code: 'gateway/internal', message: 'path open failed: Path has no verified Host path' })
+    .rejects.toMatchObject({ code: 'gateway/bad-request', message: 'Path has no verified Host path' })
   expect(openPath).not.toHaveBeenCalled()
 })
 
@@ -213,7 +214,7 @@ it('dispatches default-app opening to the association adapter', async () => {
   })
   const signal = new AbortController().signal
   await controller.openWorkspacePath({ path: '/report.html' }, signal)
-  expect(open).toHaveBeenCalledWith('/report.html', signal)
+  expect(open).toHaveBeenCalledWith(resolve('/report.html'), signal)
 })
 
 
@@ -251,3 +252,23 @@ it('avoids desktop queries when unavailable and rejects an empty query path', as
   await expect(available.workspacePathApplications({ path: '' }, new AbortController().signal)).rejects.toMatchObject({ code: 'gateway/bad-request' })
   expect(fileApplications).not.toHaveBeenCalled()
 })
+
+
+it('returns bounded query failures and classifies cancellation through the Remote', async () => {
+  const lifetime = new AbortController()
+  const fileApplications = vi.fn()
+    .mockRejectedValueOnce(new Error('Command failed: osascript -e private-script-text'))
+    .mockImplementationOnce(async () => {
+      lifetime.abort()
+      throw new Error('native query stopped')
+    })
+  const remote = createSessionTestRemote(await context(), {
+    defaultModelSelection: () => ({ provider: 'p', model: 'm' }), cwd: '/default', nativeOpen: true, fileApplications,
+  })
+  await expect(remote.workspacePathApplications({ path: '/file.mp3' })).resolves.toMatchObject({
+    ok: false, error: { code: 'gateway/internal', message: 'file application query failed' },
+  })
+  await expect(remote.workspacePathApplications({ path: '/file.mp3' }, lifetime.signal)).resolves.toMatchObject({
+    ok: false, error: { code: 'gateway/cancelled' },
+  })
+})
diff --git a/packages/api/session-controller/tests/test-remote.ts b/packages/api/session-controller/tests/test-remote.ts
index 152cffe9b2..f0abf92ca0 100644
--- a/packages/api/session-controller/tests/test-remote.ts
+++ b/packages/api/session-controller/tests/test-remote.ts
@@ -1,5 +1,5 @@
-import type { SessionControllerInternals } from '../src/index.ts'
 /** Test-only direct Remote face over the Session Controller's internal controllers. */
+import type { SessionControllerInternals } from '../src/index.ts'
 
 import { SessionLogOffset } from '@deepseek-ai/dsh-session'
 import type { Context } from '@deepseek-ai/cordis'
@@ -49,6 +49,7 @@ import type {
   SessionListValue,
   SessionOpenWorkspacePathRequest,
   SessionOpenWorkspacePathValue,
+  SessionWorkspacePathApplication,
   SessionPage,
   SessionPageRequest,
   SessionPromptRequest,
@@ -66,6 +67,9 @@ import type {
 
 /** Direct test face matching the generated `ctx.remote.session` unary methods. */
 export interface TestSessionRemote {
+  workspacePathApplications(
+    request: { readonly path: string }, signal?: AbortSignal,
+  ): Promise<RemoteResult<readonly SessionWorkspacePathApplication[]>>
   canOpenWorkspacePath(): Promise<RemoteResult<boolean>>
   list(request: SessionListRequest, signal?: AbortSignal): Promise<RemoteResult<SessionListValue>>
   search(request: SessionSearchRequest, signal?: AbortSignal): Promise<RemoteResult<SessionSearchValue>>
@@ -339,6 +343,9 @@ export function createSessionTestRemote(
 ): TestSessionRemote {
   const direct = createSessionTestController(ctx, defaults)
   return {
+    workspacePathApplications: (request, signal = new AbortController().signal) => remoteResult(
+      () => direct.workspacePathApplications(request, signal), signal,
+    ),
     canOpenWorkspacePath: () => remoteResult(() => direct.canOpenWorkspacePath()),
     list: (request, signal = new AbortController().signal) => remoteResult(
       () => direct.list(request, signal),
diff --git a/packages/api/session-controller/tsconfig.client.json b/packages/api/session-controller/tsconfig.client.json
index b8a0d78fc2..a1375420ca 100644
--- a/packages/api/session-controller/tsconfig.client.json
+++ b/packages/api/session-controller/tsconfig.client.json
@@ -11,62 +11,24 @@
     "src/remote-events.ts"
   ],
   "references": [
-    {
-      "path": "../../../vendor/cordis"
-    },
-    {
-      "path": "../gateway/tsconfig.client.json"
-    },
-    {
-      "path": "../../attachment/attachment"
-    },
-    {
-      "path": "../../client/connection/tsconfig.client.json"
-    },
-    {
-      "path": "../../client/file-upload/tsconfig.client.json"
-    },
-    {
-      "path": "../../client/store"
-    },
-    {
-      "path": "../../context/file-reference"
-    },
-    {
-      "path": "../../core/session"
-    },
-    {
-      "path": "../../jobs/jobs"
-    },
-    {
-      "path": "../../llm/llm"
-    },
-    {
-      "path": "../../session/session-projection"
-    },
-    {
-      "path": "../../session/session-title"
-    },
-    {
-      "path": "../../subagent/subagent"
-    },
-    {
-      "path": "../../util/brand"
-    },
-    {
-      "path": "../../util/crypto"
-    },
-    {
-      "path": "../../util/workspace-path"
-    },
-    {
-      "path": "../../workspace/workspace"
-    },
-    {
-      "path": "../../typert/protocol"
-    },
-    {
-      "path": "../../util/native-command"
-    }
+    { "path": "../../../vendor/cordis" },
+    { "path": "../gateway/tsconfig.client.json" },
+    { "path": "../../attachment/attachment" },
+    { "path": "../../client/connection/tsconfig.client.json" },
+    { "path": "../../client/file-upload/tsconfig.client.json" },
+    { "path": "../../client/store" },
+    { "path": "../../context/file-reference" },
+    { "path": "../../core/session" },
+    { "path": "../../jobs/jobs" },
+    { "path": "../../llm/llm" },
+    { "path": "../../session/session-projection" },
+    { "path": "../../session/session-title" },
+    { "path": "../../subagent/subagent" },
+    { "path": "../../util/brand" },
+    { "path": "../../util/crypto" },
+    { "path": "../../util/workspace-path" },
+    { "path": "../../workspace/workspace" },
+    { "path": "../../typert/protocol" },
+    { "path": "../../util/native-command" }
   ]
 }
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index 09253522bb..22522564a0 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: 9af134a5b223e6e2342723730700ea6663108928
-README.zh.md: 9f59f2bad80603649ea78b0e430c8fd3c2cbee15
+README.md: 72e1f7aa84a19b7f007f95fe5011a1252c6ca5a8
+README.zh.md: c480191940dcd31043fabf746866b3f053e18955
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index 9af134a5b2..72e1f7aa84 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -29,7 +29,7 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 ### What to expect
 
-The Session header and document header use the same 24px-high split button with 9px corners. The Session header includes “Open” text; the document header shows only the icon. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
+The Session header and document header use the same 24px-high split button with 9px corners. Both headers show only the icon. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
 File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
 
@@ -45,7 +45,7 @@ File associations refresh when the file changes or its menu opens; cancelled que
 
 The plugin registers the split button on `conversation.session.header.utilities` through the standard slot/inject currency and registers the `open-in-app` dictionaries as one effect. A page-lifetime controller ([`src/client/controller.ts`](src/client/controller.ts)) owns the once-per-page availability read, the persisted choice snapshot store, and the launch POST; the component receives both stores through the inject `hooks` compartment, so every Session header shares one truth. Document-relative route forms and wire payload types come from the host package's browser-safe `@deepseek-ai/dsh-host-open-in-app/shared` subpath. In-flight launches are guarded by a ref — repeat clicks and menu picks during a launch are ignored whole (a pick would otherwise persist a choice the gesture never opened) — and the busy/error dress is timer-driven around the `launch` promise.
 
-The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while their native operations pass through [`open-path.ts`](src/client/open-path.ts) and the Session Remote. The directory adapter keeps the existing catalog routes. A failed or unavailable file query therefore needs no platform-specific UI implementation.
+The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while `OpenPathInjected.applications` queries `session.workspacePathApplications` through [`open-path.ts`](src/client/open-path.ts). Opening uses `session.openWorkspacePath`; the Host revalidates an explicitly selected handler before launch. The directory adapter keeps the existing catalog routes. A failed or unavailable file query therefore needs no platform-specific UI implementation.
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 9f59f2bad8..c480191940 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -29,7 +29,7 @@ kind: "package-reference"
 
 ### 预期行为
 
-会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。会话标题栏显示“打开”文字，文档标题栏只显示图标。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
+会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。两个标题栏都只显示图标。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
 文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
 
@@ -45,7 +45,7 @@ kind: "package-reference"
 
 插件通过标准 slot/inject 机制把分体按钮注册到 `conversation.session.header.utilities`，并以一个 effect 注册 `open-in-app` 词典。一个页面生命周期的 controller（[`src/client/controller.ts`](src/client/controller.ts)）拥有每页一次的可用性读取、持久化选择的 snapshot store 与启动 POST；组件经 inject 的 `hooks` 隔间接收两个 store，因此所有会话头部共享同一份事实。文档相对的路由形式与 wire 载荷类型来自主机包的浏览器安全子路径 `@deepseek-ai/dsh-host-open-in-app/shared`。飞行中的启动由 ref 守卫——启动期间的重复点击与菜单选择被整体忽略（否则会持久化一个该手势从未打开的选择）——busy/error 视觉由围绕 `launch` promise 的定时器驱动。
 
-目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，原生操作通过 [`open-path.ts`](src/client/open-path.ts) 与 Session Remote 执行。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
+目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，`OpenPathInjected.applications` 通过 [`open-path.ts`](src/client/open-path.ts) 查询 `session.workspacePathApplications`。打开操作使用 `session.openWorkspacePath`，Host 在启动前重新验证指定的关联应用。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
index f4b4c03bd4..a58ed63933 100644
--- a/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenInAppAction.tsx
@@ -81,7 +81,7 @@ export function OpenInAppAction(props: OpenInAppActionProps): React.JSX.Element
   if (preferred === undefined || cwd === undefined || cwd === '') return null
   return (
     <OpenTargetButton
-      key={cwd} kind="directory" showLabel applications={apps} defaultId={preferred.id} failed={false} t={t}
+      key={cwd} kind="directory" applications={apps} defaultId={preferred.id} failed={false} t={t}
       execute={async (operation) => {
         const id = operation.kind === 'application' ? operation.id : preferred.id
         try {
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 3377d71039..e4cbc0a3ca 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -28,7 +28,6 @@ export interface OpenTargetButtonProps {
   readonly failed: boolean
   readonly loading?: boolean
   readonly prominent?: boolean
-  readonly showLabel?: boolean
   readonly t: TranslateNS<typeof NS>
   readonly execute: (operation: OpenTargetOperation) => Promise<OpenInAppPathFailure | null>
   readonly refresh?: () => void
@@ -115,10 +114,10 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
             data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
             <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
-              <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent || props.showLabel ? undefined : primaryLabel}
+              <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
                 data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
                 data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
-                {icon}{(props.prominent || props.showLabel) && (revealDefault ? t('path.reveal') : t('path.open'))}
+                {icon}{(props.prominent) && (revealDefault ? t('path.reveal') : t('path.open'))}
               </button>
             </Tooltip>
             <button
diff --git a/packages/client/ui-open-in-app/src/client/open-path.ts b/packages/client/ui-open-in-app/src/client/open-path.ts
index 3c44e54a23..e403a80da9 100644
--- a/packages/client/ui-open-in-app/src/client/open-path.ts
+++ b/packages/client/ui-open-in-app/src/client/open-path.ts
@@ -1,6 +1,5 @@
 /**
- * Default-application actions on one Host file path, over the Session Remote:
- * whether this Host can hand a path to a desktop, and the open or reveal call.
+ * Host desktop availability, file associations, and open/reveal actions over the Session Remote.
  * The desktop answer is read once per page; a failed read renders no control.
  */
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
@@ -18,6 +17,7 @@ export interface OpenInAppPathRemote {
   readonly session: {
     /** Whether the Host can hand a workspace path to a native desktop. */
     canOpenWorkspacePath(): Promise<RemoteResult<boolean>>
+    /** Current registered file handlers and their default selection. */
     workspacePathApplications(
       request: { path: string }, signal?: AbortSignal,
     ): Promise<RemoteResult<readonly SessionWorkspacePathApplication[]>>
@@ -72,13 +72,14 @@ export class OpenInAppPathController {
    * @returns application metadata, or null when the query fails.
    */
   async applications(path: string, signal: AbortSignal): Promise<readonly SessionWorkspacePathApplication[] | null> {
+    let result: RemoteResult<readonly SessionWorkspacePathApplication[]>
     try {
-      const result = await this.remote.session.workspacePathApplications({ path }, signal)
-      return result.ok ? result.value : null
+      result = await this.remote.session.workspacePathApplications({ path }, signal)
     } catch (_error) {
-      // Carrier failure leaves default opening available while the menu reports the failed query.
+      // The control reports query failure and keeps file reveal available.
       return null
     }
+    return result.ok ? result.value : null
   }
 
   private async run(): Promise<void> {
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 67f3fe8be6..e1f044c720 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -77,11 +77,11 @@ describe('OpenInAppAction visibility', () => {
 
   it('shows the remembered choice, falling back to the first available app when it is gone', () => {
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'cursor', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['path.open'] }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/cursor')
+    expect(screen.getByRole('button', { name: t('open.title', { app: 'Cursor' }) }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/cursor')
     cleanup()
 
     render(<OpenInAppAction {...bench({ apps: ['finder', 'cursor'], choice: 'vscode', cwd: '/w' }).props} />)
-    expect(screen.getByRole('button', { name: zh['path.open'] }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/finder')
+    expect(screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) }).querySelector('img')?.getAttribute('src')).toBe('open-in-app/icon/finder')
   })
 })
 
@@ -90,7 +90,7 @@ describe('OpenInAppAction launching', () => {
     const pending = Promise.withResolvers<undefined>()
     const b = bench({ apps: ['finder', 'cursor'], cwd: '/w/dir', launch: () => pending.promise })
     const view = render(<OpenInAppAction {...b.props} />)
-    const main = screen.getByRole('button', { name: zh['path.open'] })
+    const main = screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) })
     fireEvent.click(main)
     expect(main).toHaveProperty('disabled', true)
     expect(screen.getByRole('button', { name: zh['path.more'] })).toHaveProperty('disabled', true)
@@ -136,7 +136,7 @@ describe('OpenInAppAction launching', () => {
 
   it('uses the shared product tooltip', async () => {
     render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w' }).props} />)
-    fireEvent.mouseEnter(screen.getByRole('button', { name: zh['path.open'] }))
+    fireEvent.mouseEnter(screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) }))
     expect(await screen.findByText(zh['open.tooltip'])).toBeTruthy()
   })
 })
diff --git a/packages/extensions/tool-cordis/src/api-catalog.ts b/packages/extensions/tool-cordis/src/api-catalog.ts
index 4fc3e120af..61464ec568 100644
--- a/packages/extensions/tool-cordis/src/api-catalog.ts
+++ b/packages/extensions/tool-cordis/src/api-catalog.ts
@@ -1749,6 +1749,7 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         description: 'Query current file handlers on the serving desktop without activating an Agent.',
         parameters: [{ name: 'request', description: 'file path in Host filesystem syntax.' }, { name: 'signal', description: 'caller lifetime, propagated to filesystem and desktop queries.' }],
         returns: 'OS application names, icons, and default selection; empty when desktop opening is unavailable.',
+        throws: ['RemoteError when the path is invalid, the query is cancelled, or native discovery fails.'],
       },
       {
         signature: '@Remote(\'rename\') rename(request: SessionRenameRequest): Promise<SessionRenameValue>',
diff --git a/packages/util/native-command/README.i18n.yaml b/packages/util/native-command/README.i18n.yaml
index cbfe2d6fb6..b234b64011 100644
--- a/packages/util/native-command/README.i18n.yaml
+++ b/packages/util/native-command/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/util/native-command/README.md
-README.md: ca820c4bc6c3ccdc9a54d4392176eb382ce5ae12
-README.zh.md: a948befc487c624d88426b27d15ecb0a91a8f813
+README.md: e17228c694ffb8f69ef694695df54a1fa2f9a21a
+README.zh.md: 68556683ce45bbceb510a4e2fa9227ece033c492
diff --git a/packages/util/native-command/README.md b/packages/util/native-command/README.md
index ca820c4bc6..e17228c694 100644
--- a/packages/util/native-command/README.md
+++ b/packages/util/native-command/README.md
@@ -49,7 +49,7 @@ The `NativeCommandRunner` type is the injectable command boundary for host integ
 
 `revealNativePath(path, signal)` selects the file in Finder or Explorer, including WSL path translation, and opens its parent directory through `xdg-open` on desktop Linux. `nativeFileManager()` identifies that action for Host-derived UI labels; desktop availability remains a separate `canOpenNativePath()` check. Callers must authorize the absolute file path before invoking either operation. Platform dispatch is covered by injected-runner tests; native desktop verification belongs to the corresponding platform. Explorer receives an encoded file URI as a separate argument. Its exit code 1 is accepted as a delegated handoff; cancellation, missing executables, and other exit codes still reject. This acknowledgement does not prove that a desktop window selected the file.
 
-`nativeFileApplications(path, signal)` returns registered applications, localized names, icons, and the current default. macOS uses LaunchServices; Windows uses Shell association handlers; Linux uses GIO with shared XDG desktop-entry and icon lookup. `openNativeFileApplication(path, application, signal)` revalidates the handler without changing the system default. Windows delegates invocation to the Shell, and Linux delegates argument expansion to `gio launch`. WSL translates the path and uses the Windows adapter. Callers authorize the local file path. Native integration tests use private Windows file associations and Linux XDG roots on their respective platforms.
+`nativeFileApplications(path, signal)` returns registered applications, localized names, icons, and the current default. macOS 12 and later use LaunchServices; Windows uses Shell association handlers; Linux uses GIO with shared XDG desktop-entry and icon lookup. `openNativeFileApplication(path, application, signal)` revalidates the handler without changing the system default. Windows delegates invocation to the Shell, and Linux delegates argument expansion to `gio launch`. WSL translates the path and uses the Windows adapter. Callers authorize the local file path. Native integration tests use private Windows file associations and Linux XDG roots on their respective platforms.
 
 -----
 
diff --git a/packages/util/native-command/README.zh.md b/packages/util/native-command/README.zh.md
index a948befc48..68556683ce 100644
--- a/packages/util/native-command/README.zh.md
+++ b/packages/util/native-command/README.zh.md
@@ -49,7 +49,7 @@ const { stdout, stderr } = await runNativeCommand('osascript', ['-e', script], s
 
 `revealNativePath(path, signal)` 在 Finder 或文件资源管理器中选中文件，包含 WSL 路径转换；在桌面 Linux 上通过 `xdg-open` 打开上层目录。`nativeFileManager()` 标识该操作，供 UI 根据 Host 选择文案；桌面是否可用仍由独立的 `canOpenNativePath()` 检查决定。调用方必须先授权绝对文件路径，再执行操作。平台分派由注入运行器的测试覆盖；原生桌面验证由对应平台负责。 Explorer 接收独立参数中的编码文件 URI。退出码 1 按已转交请求处理；取消、找不到可执行文件和其他退出码仍然报错。该确认不能证明桌面窗口已选中文件。
 
-`nativeFileApplications(path, signal)` 返回关联应用、本地化名称、图标和当前默认项。macOS 使用 LaunchServices，Windows 使用 Shell 关联处理器，Linux 使用 GIO，并共用 XDG 桌面文件和图标读取逻辑。`openNativeFileApplication(path, application, signal)` 重新验证关联应用，不修改系统默认值。Windows 交给 Shell 启动应用，Linux 交给 `gio launch` 展开参数。WSL 转换路径后使用 Windows 适配器。调用方负责验证本地文件路径。原生集成测试分别在相应平台使用独立的 Windows 文件关联和 Linux XDG 目录。
+`nativeFileApplications(path, signal)` 返回关联应用、本地化名称、图标和当前默认项。macOS 12 及以上版本使用 LaunchServices，Windows 使用 Shell 关联处理器，Linux 使用 GIO，并共用 XDG 桌面文件和图标读取逻辑。`openNativeFileApplication(path, application, signal)` 重新验证关联应用，不修改系统默认值。Windows 交给 Shell 启动应用，Linux 交给 `gio launch` 展开参数。WSL 转换路径后使用 Windows 适配器。调用方负责验证本地文件路径。原生集成测试分别在相应平台使用独立的 Windows 文件关联和 Linux XDG 目录。
 
 -----
 
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index b61e9993a4..9b834ad8dd 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -4,11 +4,8 @@ import { linuxFileApplications } from './file-applications-linux.ts'
 import { windowsFileApplications } from './file-applications-windows.ts'
 import { nativeFileManager } from './path-opener.ts'
 import type { PathOpenerInternals } from './path-opener.ts'
-
 import type { NativeFileApplication } from './types.ts'
 
-export type { NativeFileApplication } from './types.ts'
-
 /** AppKit runs inside the system JXA host; paths arrive as argv, never executable source. */
 const MAC_APPLICATIONS = `
 ObjC.import('AppKit');
@@ -22,18 +19,22 @@ function run(argv) {
   for (var i = 0; i < urls.count; i++) {
     var url = urls.objectAtIndex(i);
     var path = ObjC.unwrap(url.path);
-    var icon = workspace.iconForFile(path);
-    var thumbnail = $.NSImage.alloc.initWithSize($.NSMakeSize(32, 32));
-    thumbnail.lockFocus;
-    icon.drawInRectFromRectOperationFraction($.NSMakeRect(0, 0, 32, 32), $.NSZeroRect, $.NSCompositingOperationSourceOver, 1);
-    thumbnail.unlockFocus;
-    var bitmap = $.NSBitmapImageRep.imageRepWithData(thumbnail.TIFFRepresentation);
-    var png = bitmap.representationUsingTypeProperties($.NSBitmapImageFileTypePNG, $({}));
+    var image = null;
+    if (argv[1] === 'icons') {
+      var icon = workspace.iconForFile(path);
+      var thumbnail = $.NSImage.alloc.initWithSize($.NSMakeSize(32, 32));
+      thumbnail.lockFocus;
+      icon.drawInRectFromRectOperationFraction($.NSMakeRect(0, 0, 32, 32), $.NSZeroRect, $.NSCompositingOperationSourceOver, 1);
+      thumbnail.unlockFocus;
+      var bitmap = $.NSBitmapImageRep.imageRepWithData(thumbnail.TIFFRepresentation);
+      var png = bitmap.representationUsingTypeProperties($.NSBitmapImageFileTypePNG, $({}));
+      image = png.isNil() ? null : 'data:image/png;base64,' + ObjC.unwrap(png.base64EncodedStringWithOptions(0));
+    }
     apps.push({
       id: path,
       name: ObjC.unwrap($.NSFileManager.defaultManager.displayNameAtPath(path)),
       default: path === preferredPath,
-      icon: png.isNil() ? null : 'data:image/png;base64,' + ObjC.unwrap(png.base64EncodedStringWithOptions(0))
+      icon: image
     });
   }
   return JSON.stringify(apps);
@@ -48,6 +49,13 @@ function run(argv) {
  */
 export async function nativeFileApplications(
   path: string, signal: AbortSignal, internals: PathOpenerInternals = {},
+): Promise<readonly NativeFileApplication[]> {
+  return queryFileApplications(path, signal, internals, true)
+}
+
+/** Query metadata with optional macOS icon rendering for display or launch authorization. */
+async function queryFileApplications(
+  path: string, signal: AbortSignal, internals: PathOpenerInternals, icons: boolean,
 ): Promise<readonly NativeFileApplication[]> {
   signal.throwIfAborted()
   const target = await desktopTarget(path, signal, internals)
@@ -55,7 +63,7 @@ export async function nativeFileApplications(
   if (target.platform === 'linux') return linuxFileApplications(path, signal, run, internals.env ?? process.env)
   let stdout: string
   if (target.platform === 'darwin') {
-    stdout = (await run('osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, target.path], signal)).stdout
+    stdout = (await run('osascript', ['-l', 'JavaScript', '-e', MAC_APPLICATIONS, target.path, icons ? 'icons' : 'handlers'], signal)).stdout
   } else if (target.platform === 'win32') {
     stdout = await windowsFileApplications(target.path, null, signal, run)
   } else return []
@@ -93,7 +101,7 @@ export async function openNativeFileApplication(
     await windowsFileApplications(target.path, application, signal, run)
     return
   }
-  const apps = await nativeFileApplications(path, signal, internals)
+  const apps = await queryFileApplications(path, signal, internals, false)
   if (!apps.some(app => app.id === application)) throw new Error('Application is not registered for this file')
   if (target.platform === 'linux') await run('gio', ['launch', application, path], signal)
   else await run('open', ['-a', application, path], signal)
diff --git a/packages/util/native-command/src/index.ts b/packages/util/native-command/src/index.ts
index aa7dd946cb..9ad8e0883c 100644
--- a/packages/util/native-command/src/index.ts
+++ b/packages/util/native-command/src/index.ts
@@ -20,6 +20,6 @@ export type {
 } from './path-opener.ts'
 
 export { nativeFileApplications, openNativeFileApplication } from './file-applications.ts'
-export type { NativeFileApplication } from './file-applications.ts'
+export type { NativeFileApplication } from './types.ts'
 
 export { desktopEntryFields, desktopDataDirectories, desktopApplicationIcon } from './desktop-entry.ts'
diff --git a/packages/util/native-command/tests/file-applications.spec.ts b/packages/util/native-command/tests/file-applications.spec.ts
index 43c447fe1d..2dfe31a9da 100644
--- a/packages/util/native-command/tests/file-applications.spec.ts
+++ b/packages/util/native-command/tests/file-applications.spec.ts
@@ -11,7 +11,7 @@ describe('native file associations', () => {
     const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
     const path = '/tmp/中文 $(touch nope).mp3'
     await expect(nativeFileApplications(path, signal, { platform: 'darwin', run })).resolves.toEqual([application])
-    expect(run).toHaveBeenCalledWith('osascript', ['-l', 'JavaScript', '-e', expect.any(String), path], signal)
+    expect(run).toHaveBeenCalledWith('osascript', ['-l', 'JavaScript', '-e', expect.any(String), path, 'icons'], signal)
   })
 
   it.each(['{}', '[null]', '[{"id":1}]', JSON.stringify([{ ...application, icon: 'javascript:alert(1)' }])])('rejects malformed native output %s', async (stdout) => {
@@ -23,6 +23,7 @@ describe('native file associations', () => {
   it('launches only a currently registered application with argv', async () => {
     const run = vi.fn(async () => ({ stdout: JSON.stringify([application]), stderr: '' }))
     await openNativeFileApplication('/file.mp3', application.id, signal, { platform: 'darwin', run })
+    expect(run).toHaveBeenNthCalledWith(1, 'osascript', ['-l', 'JavaScript', '-e', expect.any(String), '/file.mp3', 'handlers'], signal)
     expect(run).toHaveBeenLastCalledWith('open', ['-a', application.id, '/file.mp3'], signal)
     run.mockClear()
     await expect(openNativeFileApplication('/file.mp3', '/arbitrary.app', signal, { platform: 'darwin', run })).rejects.toThrow('not registered')

From 33782150cdddaef8e66b77bc3dfa6056c417b223 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:42:31 +0800
Subject: [PATCH 30/62] fix: name the default application in opening tooltips

---
 packages/client/ui-open-in-app/README.i18n.yaml               | 4 ++--
 packages/client/ui-open-in-app/README.md                      | 2 +-
 packages/client/ui-open-in-app/README.zh.md                   | 2 +-
 .../client/ui-open-in-app/src/client/OpenTargetButton.tsx     | 2 +-
 packages/client/ui-open-in-app/src/client/locales.ts          | 4 +---
 .../ui-open-in-app/tests/open-in-app-action.client.spec.tsx   | 4 ++--
 6 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index 22522564a0..a52f9a0e85 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: 72e1f7aa84a19b7f007f95fe5011a1252c6ca5a8
-README.zh.md: c480191940dcd31043fabf746866b3f053e18955
+README.md: 035315fa4c770b51614c7cf90064bed9ee00951e
+README.zh.md: 248ed5335a30e5101fb10aa95a7a77a6eb73725e
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index 72e1f7aa84..035315fa4c 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -29,7 +29,7 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 ### What to expect
 
-The Session header and document header use the same 24px-high split button with 9px corners. Both headers show only the icon. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
+The Session header and document header use the same 24px-high split button with 9px corners. Both headers show only the icon; their tooltip names the default application or the reveal action. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
 File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index c480191940..248ed5335a 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -29,7 +29,7 @@ kind: "package-reference"
 
 ### 预期行为
 
-会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。两个标题栏都只显示图标。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
+会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。两个标题栏都只显示图标，悬停提示显示默认应用名称或文件定位动作。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
 文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
 
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index e4cbc0a3ca..e9284d9293 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -113,7 +113,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         anchor={(
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
             data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
-            <Tooltip label={revealDefault ? t('path.reveal') : t('open.tooltip')} side="bottom" delayMs={500}>
+            <Tooltip label={primaryLabel} side="bottom" delayMs={500}>
               <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
                 data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
                 data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
diff --git a/packages/client/ui-open-in-app/src/client/locales.ts b/packages/client/ui-open-in-app/src/client/locales.ts
index 77d24914f3..29845dc875 100644
--- a/packages/client/ui-open-in-app/src/client/locales.ts
+++ b/packages/client/ui-open-in-app/src/client/locales.ts
@@ -39,8 +39,7 @@ const PRODUCT_NAMES = {
 
 /** Simplified Chinese dictionary (the key-set source of truth). */
 export const zh = {
-  'open.title': '在 {app} 中打开',
-  'open.tooltip': '在本地打开',
+  'open.title': '用 {app} 打开',
   'open.error': '打开失败',
   'menu.toggle': '选择打开方式',
   'menu.aria': '打开方式',
@@ -64,7 +63,6 @@ export const zh = {
 /** English dictionary, key-identical to the Chinese source of truth. */
 export const en: Record<OpenInAppKey, string> = {
   'open.title': 'Open in {app}',
-  'open.tooltip': 'Open locally',
   'open.error': 'Failed to open',
   'menu.toggle': 'Choose an app to open in',
   'menu.aria': 'Open in',
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index e1f044c720..71bb7912ee 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -134,9 +134,9 @@ describe('OpenInAppAction launching', () => {
     expect(view.container.querySelector('svg')).not.toBeNull()
   })
 
-  it('uses the shared product tooltip', async () => {
+  it('names the selected application in the tooltip', async () => {
     render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w' }).props} />)
     fireEvent.mouseEnter(screen.getByRole('button', { name: t('open.title', { app: zh['app.finder'] }) }))
-    expect(await screen.findByText(zh['open.tooltip'])).toBeTruthy()
+    expect(await screen.findByText(t('open.title', { app: zh['app.finder'] }))).toBeTruthy()
   })
 })

From 56d0534c30bae499a679e94963c7f6add59ee3b2 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:53:16 +0800
Subject: [PATCH 31/62] refactor: share native file actions across delivery and
 review views

---
 .../client/ui-deliverables/README.i18n.yaml   |   4 +-
 packages/client/ui-deliverables/README.md     |   4 +-
 packages/client/ui-deliverables/README.zh.md  |   4 +-
 .../src/client/Deliverables.module.css        |   9 +-
 .../src/client/Deliverables.tsx               |  16 ++-
 .../src/client/PresentedFileCard.tsx          |  43 +------
 .../ui-deliverables/src/client/ReviewTab.tsx  |  18 +--
 .../src/client/file-actions.ts                |  21 +++
 .../ui-deliverables/src/client/index.ts       |   9 +-
 .../ui-deliverables/src/client/locales.ts     |  18 ---
 .../src/client/present-open.ts                |  41 ++++--
 .../ui-deliverables/src/present-open.ts       |  18 ++-
 .../tests/changes-open.host.spec.ts           |  21 ++-
 .../tests/deliverables.client.spec.tsx        |  16 +--
 .../ui-deliverables/tests/file-actions.tsx    |   8 ++
 .../tests/present-open.host.spec.ts           |  21 ++-
 .../tests/presented-file-card.client.spec.tsx | 120 ++----------------
 .../tests/review-tab.client.spec.tsx          |  24 ++--
 .../client/ui-open-in-app/README.i18n.yaml    |   4 +-
 packages/client/ui-open-in-app/README.md      |   2 +-
 packages/client/ui-open-in-app/README.zh.md   |   2 +-
 packages/client/ui-open-in-app/package.json   |   4 +-
 .../src/client/FileRouteAction.tsx            |  37 ++++++
 .../src/client/OpenPathAction.tsx             |  25 +---
 .../src/client/file-applications.ts           |  37 ++++++
 .../client/ui-open-in-app/src/client/index.ts |   4 +
 .../ui-open-in-app/src/client/locales.ts      |  12 --
 .../tests/browser-plugin.client.spec.ts       |   9 +-
 .../tests/file-route-action.client.spec.tsx   |  53 ++++++++
 packages/client/ui-open-in-app/tsconfig.json  |   6 +
 .../src/client/slot-catalog.ts                |  59 +++++++++
 .../native-command/src/file-applications.ts   |  18 +--
 packages/util/native-command/src/types.ts     |  23 ++++
 pnpm-lock.yaml                                |   6 +
 scripts/no-unknown-casts.baseline.json        |   4 -
 35 files changed, 429 insertions(+), 291 deletions(-)
 create mode 100644 packages/client/ui-deliverables/src/client/file-actions.ts
 create mode 100644 packages/client/ui-deliverables/tests/file-actions.tsx
 create mode 100644 packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
 create mode 100644 packages/client/ui-open-in-app/src/client/file-applications.ts
 create mode 100644 packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx

diff --git a/packages/client/ui-deliverables/README.i18n.yaml b/packages/client/ui-deliverables/README.i18n.yaml
index 7ea790985c..8f8941ac01 100644
--- a/packages/client/ui-deliverables/README.i18n.yaml
+++ b/packages/client/ui-deliverables/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-deliverables/README.md
-README.md: 71f3545b8fb3fed3ecd678258e6c50bbfa4b580c
-README.zh.md: 3e59ed2b7d4ac7e9d64b7d1f2f3c477e3ca1c50e
+README.md: 9073659f5b6aeb11112aaa1c4e7834bf055944e7
+README.zh.md: 7a622b6f0bcf4bc75027542cc90fe6c2e2b86471
diff --git a/packages/client/ui-deliverables/README.md b/packages/client/ui-deliverables/README.md
index 71f3545b8f..9073659f5b 100644
--- a/packages/client/ui-deliverables/README.md
+++ b/packages/client/ui-deliverables/README.md
@@ -30,9 +30,9 @@ Mount this plugin alongside `ui-conversation` and the Host [workspace-changes](.
 <a id="explicit-deliveries"></a>
 ### Explicit deliveries
 
-The Web `standard`, `ptc`, and `cordis` presets expose `present` for final files accessible through the Session filesystem, including files created through Bash. Call it with `files: [{ path, description? }]` after creating the files. The [present tool](../../deliverables/tool-present/README.md) owns file-count limits and Session declarations. The closing turn shows one delivery as a full-width card and multiple deliveries in a two-column grid with 10px gaps. A list longer than four files starts collapsed and provides a control that reveals or hides the complete list. Each 60px-high card uses 8px vertical and 10px horizontal inset spacing, a 20px shared `FileTypeIcon` in a 40px frame, 13px filename text, 10px secondary text, and a 12px Open action. It shows the basename and description, or the file type when no description exists; a trailing parenthesized suffix in the description is omitted, and hovering the card replaces that line with the Sidebar-preview action. Clicking the card or the left side of its split Open control previews the file in the right Sidebar. The chevron opens the standard menu for the Host default application plus Show in Finder on macOS, Show in File Explorer on Windows and WSL, or Open containing folder through the default Linux file manager. Matching inline-code references preview the same source files in the right Sidebar; native opening requires an explicit card-menu action. Repeated declaration of a path selects its latest description before the closing reply.
+The Web `standard`, `ptc`, and `cordis` presets expose `present` for final files accessible through the Session filesystem, including files created through Bash. Call it with `files: [{ path, description? }]` after creating the files. The [present tool](../../deliverables/tool-present/README.md) owns file-count limits and Session declarations. A single delivery fills the row; multiple deliveries form a two-column grid, collapsed after four files. Cards show the basename, description or file type, and a shared native opening control. Clicking the card previews the file in the right Sidebar. The control opens the default application and lists associated applications, with file reveal last. Matching inline-code references also open Sidebar previews. Duplicate declarations use the last description before the closing reply.
 
-The `present` tool row retains the delivery-document glyph while showing running, delivered, failed, or interrupted status; expanding a settled row reveals its recorded result. The collapsible card grid retains every delivered file. Both menu actions share pending state and show progress, acknowledgement, or an action-specific retryable error. Desktop information is read when delivery cards appear and invalidated on connection replacement; responses from a replaced connection cannot publish metadata. Selecting a native menu action returns keyboard focus to the available Sidebar Open button. Pending actions close the menu until another explicit gesture. A missing desktop disables the Open menu; a failed desktop-information read offers Retry. It requires a desktop and a suitable default application on the serving Host; a remote browser does not open applications on its own device.
+The `present` tool row retains its document icon and recorded result across progress, success, failure, and interruption. Native actions share pending state and publish progress or retryable errors on the card. Desktop metadata is loaded when cards mount and invalidated on connection replacement. Without a Host desktop, cards retain Sidebar preview but omit native controls; failed metadata reads offer Retry. Delivery cards and change review expose `deliverables.file.actions`, supplied by [ui-open-in-app](../ui-open-in-app/README.md). Association GET requests and native POST actions both validate the recorded file coordinates and Session filesystem mapping before using the Host desktop.
 
 ### The changed-files card
 
diff --git a/packages/client/ui-deliverables/README.zh.md b/packages/client/ui-deliverables/README.zh.md
index 3e59ed2b7d..7a622b6f0b 100644
--- a/packages/client/ui-deliverables/README.zh.md
+++ b/packages/client/ui-deliverables/README.zh.md
@@ -30,9 +30,9 @@ kind: "package-reference"
 <a id="explicit-deliveries"></a>
 ### 显式交付
 
-Web 的 `standard`、`ptc` 与 `cordis` preset 提供 `present` 用于声明交付会话文件系统可访问的最终文件，包括通过 Bash 创建的文件。创建文件后，以 `files: [{ path, description? }]` 调用。[present 工具](../../deliverables/tool-present/README.zh.md)拥有文件数量限制和会话声明。收尾轮次把单个交付显示为横向占满内容区的卡片，把多个交付显示为间距 10px 的双列网格。文件超过四个时，列表默认收起，并提供显示或隐藏完整列表的控件。每张卡片高 60px，上下内边距为 8px、左右为 10px；40px 图标框内使用 20px 的共享 `FileTypeIcon`，文件名为 13px、次要文本为 10px，“打开”操作为 12px。卡片显示 basename 与说明；没有说明时显示文件类型，说明末尾的括号后缀会被省略，悬停卡片时该行切换为侧栏预览提示。点击卡片或分段“打开”控件的左侧会在右侧 Sidebar 中预览文件；右侧箭头打开标准菜单，其中提供 Host 默认应用，以及 macOS 上的“在 Finder 中显示”、Windows 和 WSL 上的“在文件资源管理器中显示”或 Linux 默认文件管理器的“打开所在文件夹”。匹配的行内代码引用在右侧 Sidebar 中预览相同源文件；原生打开需要显式选择卡片菜单中的操作。同一路径重复声明时，选择收尾回复之前最近一次的说明。
+Web 的 `standard`、`ptc` 与 `cordis` preset 提供 `present`，用于声明会话文件系统可访问的最终文件，包括通过 Bash 创建的文件。创建后以 `files: [{ path, description? }]` 调用。[present 工具](../../deliverables/tool-present/README.zh.md)拥有文件数量限制和会话声明。单个交付占满一行，多个交付使用双列网格，超过四个时默认收起。卡片显示文件名、说明或文件类型，以及共享的原生打开控件。点击卡片会在右侧 Sidebar 预览文件。控件打开默认应用，并列出关联应用，文件定位始终放在最后。匹配的行内代码引用也打开 Sidebar 预览。重复声明使用收尾回复之前最近一次的说明。
 
-`present` 工具行在正在交付、已交付、失败或中断状态下都保留交付文档图标；展开已结束的调用可查看其记录的结果。可折叠卡片网格保留全部交付文件。菜单中的两个操作共享等待状态，并显示进度、成功确认或各自可重试的错误。交付卡片出现时读取桌面信息，连接更换时清除缓存，旧连接的响应不能更新元数据。选择原生菜单操作后，键盘焦点回到仍可用的侧边栏“打开”按钮。等待操作完成时关闭菜单，用户再次点击才会打开。Host 没有桌面时禁用“打开”菜单；桌面信息读取失败时提供“重试”。服务 Host 必须具备桌面和合适的默认应用；远程浏览器不会打开其所在设备上的应用。
+`present` 工具行在执行、成功、失败和中断状态下保留文档图标及记录的结果。原生操作共享等待状态，并在卡片显示进度或可重试错误。卡片挂载时读取桌面信息，连接更换时清除缓存。Host 没有桌面时，卡片保留 Sidebar 预览并隐藏原生控件；元数据读取失败时提供重试。交付卡片和变更对比页通过 `deliverables.file.actions` 使用 [ui-open-in-app](../ui-open-in-app/README.zh.md) 提供的控件。关联应用 GET 查询与原生 POST 操作都会先校验记录中的文件坐标及会话文件系统映射，再调用 Host 桌面。
 
 ### 改动文件卡片
 
diff --git a/packages/client/ui-deliverables/src/client/Deliverables.module.css b/packages/client/ui-deliverables/src/client/Deliverables.module.css
index c772e6d01c..eac1f29ea4 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.module.css
+++ b/packages/client/ui-deliverables/src/client/Deliverables.module.css
@@ -20,16 +20,9 @@
 .previewHint { display: none; }
 .file:hover .secondaryText { display: none; }
 .file:hover .previewHint { display: inline; }
-.split { display: inline-flex; flex: none; align-items: stretch; box-sizing: border-box; height: 28px; overflow: hidden; pointer-events: auto; border: 0.5px solid var(--dsw-alias-border-l3); border-radius: 10px; background: var(--dsw-alias-button-floating-fill); }
-.menuAnchor { align-self: stretch; }
-.open, .chevron { display: inline-flex; align-items: center; justify-content: center; border: 0; background: none; color: var(--dsw-alias-label-primary); cursor: pointer; font-family: var(--dsw-font-family); }
-.open { padding: 4px 8px; font-size: 12px; line-height: 18px; }
-.chevron { padding: 4px 5px; border-left: 0.5px solid var(--dsw-alias-border-l3); color: var(--dsw-alias-label-secondary); }
-.open:hover, .open:focus-visible, .chevron:hover:not(:disabled), .chevron:focus-visible { background: var(--dsw-alias-interactive-bg-hover); }
-.chevron:disabled { color: var(--dsw-alias-label-dimmed); cursor: not-allowed; }
-.menuActionIcon { display: block; width: 16px; height: 16px; }
 .toggle { align-self: center; display: inline-flex; align-items: center; gap: 4px; min-width: 0; padding: 1px 11px; border: 0; border-radius: 8px; background: transparent; color: var(--dsw-alias-label-tertiary); cursor: pointer; font: inherit; font-size: 12px; line-height: 18px; }
 .toggle:hover { background: var(--dsw-alias-interactive-bg-hover); }
 .toggle svg { flex: none; width: 14px; height: 14px; }
 @container (max-width: 620px) { .presented { grid-template-columns: minmax(0, 1fr); } }
 @media (pointer: coarse) { .split { min-height: 44px; } .open, .chevron { min-width: 44px; } }
+.actions { display: inline-flex; flex: none; pointer-events: auto; }
diff --git a/packages/client/ui-deliverables/src/client/Deliverables.tsx b/packages/client/ui-deliverables/src/client/Deliverables.tsx
index ed7c034941..fa6c167b1e 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.tsx
+++ b/packages/client/ui-deliverables/src/client/Deliverables.tsx
@@ -2,7 +2,7 @@
 import { useEffect, useState } from 'react'
 import type { TurnTailOwnerProps } from '@deepseek-ai/dsh-client-ui-chat/client'
 import { Button, IconChevronDownOutlineRegular, IconChevronUpOutlineRegular } from '@deepseek-ai/dsh-client-ui-primitives'
-import type { GlobalStandardProps, InjectFace, PropsLocale, PropsRuntime, SessionStandardProps } from '@deepseek-ai/dsh-client-ui-slots'
+import type { GlobalStandardProps, InjectFace, PropsLocale, PropsRenderSlots, PropsRuntime, SessionStandardProps } from '@deepseek-ai/dsh-client-ui-slots'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
 import type { PresentedOpenController } from './present-open.ts'
 import type { ChangesSummaryStore } from './changes-summary.ts'
@@ -50,7 +50,7 @@ export function selectDeliverables(owner: TurnTailOwnerProps): DeliverablesMatch
  * @param props - closing Turn, file actions, and localized copy.
  * @returns file rows, or null when the Turn declares none.
  */
-export function DeliverablesTail(props: PropsRuntime<'conversation.chat.turnTail'> & PropsLocale<typeof NS> & InjectFace<DeliverablesInjected>) {
+export function DeliverablesTail(props: PropsRuntime<'conversation.chat.turnTail'> & PropsLocale<typeof NS> & InjectFace<DeliverablesInjected> & PropsRenderSlots<'deliverables.file.actions'>) {
   const matched = selectDeliverables(props)
   return matched === null ? null : <Deliverables {...props} matched={matched} />
 }
@@ -64,10 +64,10 @@ export function DeliverablesTail(props: PropsRuntime<'conversation.chat.turnTail
  */
 export function Deliverables({
   matched, openFile, t, sessionId, useSessions, openPresented, openChangesReview, usePresentedOpen, usePresentedHost,
-  useChangesSummary, reloadPresentedHost, loadChangesSummary, useShowCodeDiff,
+  useChangesSummary, reloadPresentedHost, loadChangesSummary, useShowCodeDiff, renderSlot,
 }: Pick<TurnTailOwnerProps, 'openFile'> & {
   matched: DeliverablesMatch
-} & PropsLocale<typeof NS> & Pick<SessionStandardProps, 'sessionId'> & Pick<GlobalStandardProps, 'useSessions'> & InjectFace<DeliverablesInjected>) {
+} & PropsLocale<typeof NS> & Pick<SessionStandardProps, 'sessionId'> & Pick<GlobalStandardProps, 'useSessions'> & InjectFace<DeliverablesInjected> & PropsRenderSlots<'deliverables.file.actions'>) {
   const [expanded, setExpanded] = useState(false)
   const showCodeDiff = useShowCodeDiff(value => value)
   const cwd = useSessions(state => state.byId[sessionId]?.cwd)
@@ -105,7 +105,13 @@ export function Deliverables({
           phase={states[presentedFileUrl(sessionId, file.seq, file.index)]}
           host={host === 'error' ? null : host} t={t}
           onPreview={() => { openFile(file.path) }}
-          onAction={(action) => { void openPresented(sessionId, file.seq, file.index, action) }} />)}
+          actions={renderSlot('deliverables.file.actions', {
+            actionUrl: presentedFileUrl(sessionId, file.seq, file.index),
+            available: host !== null && host !== 'error' && host.available,
+            pending: states[presentedFileUrl(sessionId, file.seq, file.index)] === 'opening'
+              || states[presentedFileUrl(sessionId, file.seq, file.index)] === 'revealing',
+            onAction: (action, application) => openPresented(sessionId, file.seq, file.index, action, application),
+          })} />)}
       </div>
       {collapsible && <button type="button" className={css.toggle}
         aria-expanded={expanded}
diff --git a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
index 97fd431e32..03ed7e411c 100644
--- a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
+++ b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
@@ -1,12 +1,9 @@
 /** File identity and explicit default-app or file-manager actions for one delivery. */
-import { useRef, useState } from 'react'
+import type { ReactNode } from 'react'
 import { resolveWorkspacePath } from '@deepseek-ai/dsh-util-workspace-path'
-import {
-  Menu, FileTypeIcon, fileExtension, IconRightUpOutlineRegular,
-  IconChevronDownOutlineRegular, IconFolderOpenOutlineRegular,
-} from '@deepseek-ai/dsh-client-ui-primitives'
+import { FileTypeIcon, fileExtension } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { PropsLocale } from '@deepseek-ai/dsh-client-ui-slots'
-import type { PresentedAction, PresentedHost } from '../presented.ts'
+import type { PresentedHost } from '../presented.ts'
 import type { PresentedOpenPhase } from './present-open.ts'
 import { basename, type PresentedPath } from './turn-deliverables.ts'
 import type { NS } from './locales.ts'
@@ -22,25 +19,15 @@ function cardDescription(description: string | undefined, fallback: string): str
  * @param props - durable file metadata, Sidebar preview, Host capabilities, gesture status, and localized copy.
  * @returns the file card and its anchored action menu.
  */
-export function PresentedFileCard({ file, cwd, phase, host, onPreview, onAction, t }: {
+export function PresentedFileCard({ file, cwd, phase, host, onPreview, actions, t }: {
   file: PresentedPath
   cwd: string | undefined
   phase: PresentedOpenPhase | undefined
   host: PresentedHost | null
   onPreview: () => void
-  onAction: (action: PresentedAction) => void
+  actions: ReactNode
 } & PropsLocale<typeof NS>) {
-  const [menuOpen, setMenuOpen] = useState(false)
-  const previewRef = useRef<HTMLButtonElement>(null)
-  const pending = phase === 'opening' || phase === 'revealing'
-  const menuDisabled = pending || host === null || !host.available
-  if (menuDisabled && menuOpen) setMenuOpen(false)
   const reveal = host?.fileManager ?? 'directory'
-  const act = (action: PresentedAction) => {
-    setMenuOpen(false)
-    previewRef.current?.focus()
-    onAction(action)
-  }
   const name = basename(file.path)
   const metadata = fileExtension(name).toUpperCase() || t('presented.file')
   const status = phase === undefined
@@ -61,25 +48,7 @@ export function PresentedFileCard({ file, cwd, phase, host, onPreview, onAction,
           <span className={css.previewHint}>{t('presented.preview')}</span>
         </span>
       </div>
-      <div className={css.split}>
-        <button ref={previewRef} type="button" className={css.open}
-          aria-label={t('presented.previewButton', { name: file.path })}
-          onClick={onPreview}>{t('presented.action')}</button>
-        <Menu className={css.menuAnchor} open={menuOpen && !menuDisabled} autoFocus portal align="end" onClose={() => { setMenuOpen(false) }}
-          anchor={<button type="button" className={css.chevron} disabled={menuDisabled}
-            aria-haspopup="menu" aria-expanded={menuOpen && !menuDisabled}
-            aria-label={t('presented.more', { name: file.path })}
-            onClick={() => { setMenuOpen(value => !value) }}>
-            <IconChevronDownOutlineRegular size={11} />
-          </button>}
-          items={[
-            { id: 'open', icon: <IconRightUpOutlineRegular size={16} className={css.menuActionIcon} />,
-              label: t('presented.defaultApp') },
-            { id: 'reveal', icon: <IconFolderOpenOutlineRegular />,
-              label: t(`presented.${reveal}`) },
-          ]}
-          onSelect={(id) => { act(id === 'reveal' ? 'reveal' : 'open') }} />
-      </div>
+      <div className={css.actions}>{actions}</div>
     </div>
   </div>
 }
diff --git a/packages/client/ui-deliverables/src/client/ReviewTab.tsx b/packages/client/ui-deliverables/src/client/ReviewTab.tsx
index 01ac90f1fa..c51efeeaef 100644
--- a/packages/client/ui-deliverables/src/client/ReviewTab.tsx
+++ b/packages/client/ui-deliverables/src/client/ReviewTab.tsx
@@ -7,11 +7,11 @@ import { useEffect, useMemo, useRef, useState } from 'react'
 import type { ReactNode, UIEvent } from 'react'
 import {
   Button, IconChevronDownOutlineRegular, IconCompareSplitOutlineRegular, IconInspectOutlineRegular,
-  IconNowrapFillRegular, IconRightUpOutlineRegular, IconWrapFillRegular, Menu, Tooltip,
+  IconNowrapFillRegular, IconWrapFillRegular, Menu, Tooltip,
   languageForPath, useCodeHighlighter,
 } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { CodeHighlighter, HighlightSpan } from '@deepseek-ai/dsh-client-ui-primitives'
-import type { InjectFace, PropsLocale, PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
+import type { InjectFace, PropsLocale, PropsRenderSlots, PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
 import { fileAddressFor } from '@deepseek-ai/dsh-util-workspace-path'
 import type { WorkspaceChangedFile, WorkspaceDiffHunk } from '@deepseek-ai/dsh-workspace-changes/types'
@@ -45,7 +45,7 @@ export interface ReviewInjected {
 
 /** The body's composed props: the tab it draws, its store, its injected face, and its copy. */
 export type ReviewTabProps = PropsRuntime<'sidebar.right.pane.tab'> & PropsStore<ReturnType<typeof createReviewStore>>
-  & InjectFace<ReviewInjected> & PropsLocale<typeof NS>
+  & InjectFace<ReviewInjected> & PropsLocale<typeof NS> & PropsRenderSlots<'deliverables.file.actions'>
 
 /** One drawn line of a hunk with its line numbers on each side. */
 export interface DiffRow {
@@ -189,7 +189,7 @@ function Counts({ file, t }: { file: WorkspaceChangedFile } & PropsLocale<typeof
  */
 export function ReviewTab({
   useTabInfo, sessionId, useSessions, useStore, actions, useChangesSummary, useChangesDiff, usePresentedOpen, usePresentedHost,
-  loadChangesSummary, loadChangesDiff, reloadPresentedHost, openChanged, t,
+  loadChangesSummary, loadChangesDiff, reloadPresentedHost, openChanged, t, renderSlot,
 }: ReviewTabProps): ReactNode {
   const { tab } = useTabInfo()
   const { navigation, signal } = tab
@@ -266,11 +266,11 @@ export function ReviewTab({
             <button type="button" className={css.tool} aria-label={t('review.openFileAria', { name: file.display })} data-review-tool="open-file"
               onClick={() => { tab.actions.openResource(fileAddressFor(sessionId, cwd, file.path)) }}><IconInspectOutlineRegular /></button>
           </Tooltip>}
-          {file !== undefined && native && <Tooltip label={t(phase === 'error' ? 'diff.openNativeError' : 'diff.openNative')} side="bottom" delayMs={500}>
-            <button type="button" className={css.tool} disabled={phase === 'opening'} data-review-tool="open-native"
-              aria-label={t('diff.openNativeAria', { name: file.display })} data-error={phase === 'error' || undefined}
-              onClick={() => { void openChanged(sessionId, seq, index) }}><IconRightUpOutlineRegular /></button>
-          </Tooltip>}
+          {file !== undefined && renderSlot('deliverables.file.actions', {
+            actionUrl: changedFileUrl(sessionId, seq, index), available: native,
+            pending: phase === 'opening' || phase === 'revealing',
+            onAction: (action, application) => openChanged(sessionId, seq, index, action, application),
+          })}
         </span>
       </div>
       {summaryState === 'loading' && <p className={css.status} role="status">{t('diff.loading')}</p>}
diff --git a/packages/client/ui-deliverables/src/client/file-actions.ts b/packages/client/ui-deliverables/src/client/file-actions.ts
new file mode 100644
index 0000000000..b39ab16a41
--- /dev/null
+++ b/packages/client/ui-deliverables/src/client/file-actions.ts
@@ -0,0 +1,21 @@
+/** Native file-action contribution shared by delivery cards and change review. */
+import type { PresentedOpenFailure } from './present-open.ts'
+import type { PresentedAction } from '../presented.ts'
+
+declare module '@deepseek-ai/dsh-client-ui-slots' {
+  interface SlotMap {
+    /** Open one file through its authorized Session event coordinates. */
+    'deliverables.file.actions': {
+      kind: 'list'
+      scope: 'session'
+      owner: {
+        /** Authenticated document-relative action route carrying Session event coordinates. */
+        readonly actionUrl: string
+        readonly available: boolean
+        readonly pending: boolean
+        /** Execute the selected native action and publish status on the owning file surface. */
+        readonly onAction: (action: PresentedAction, application?: string) => Promise<PresentedOpenFailure>
+      }
+    }
+  }
+}
diff --git a/packages/client/ui-deliverables/src/client/index.ts b/packages/client/ui-deliverables/src/client/index.ts
index e61596ea4b..da1e38c5e6 100644
--- a/packages/client/ui-deliverables/src/client/index.ts
+++ b/packages/client/ui-deliverables/src/client/index.ts
@@ -8,6 +8,7 @@
  * cap, and copy — so composing this plugin out of cordis.yml removes every
  * surface; the owning view renders an empty list and inert prose at zero cost.
  */
+import './file-actions.ts'
 import type { Context as ClientContext } from '@deepseek-ai/cordis'
 import type {} from '@deepseek-ai/dsh-api-remotes/client'
 import type {} from '@deepseek-ai/dsh-client-connection/client'
@@ -63,13 +64,14 @@ export function apply(ctx: ClientContext): void {
       name: 'conversation.chat.turnTail',
       id: '@deepseek-ai/dsh-client-ui-deliverables',
       locale: NS,
+      children: { 'deliverables.file.actions': { kind: 'list', scope: 'session' } },
       inject: (): DeliverablesInjected => ({
         hooks: { presentedOpen: opener.state, presentedHost: opener.host, changesSummary: summaries.state,
           showCodeDiff: ctx.settingsScope.developerTools.enabled },
         reloadPresentedHost: () => opener.loadHost(),
         loadChangesSummary: (sessionId, seq) => summaries.load(sessionId, seq),
-        openPresented: (sessionId, seq, index, action) => opener.open(sessionId, seq, index, action),
-        openChanged: (sessionId, seq, index) => opener.openChanged(sessionId, seq, index),
+        openPresented: (sessionId, seq, index, action, application) => opener.open(sessionId, seq, index, action, application),
+        openChanged: (sessionId, seq, index, action, application) => opener.openChanged(sessionId, seq, index, action, application),
         openChangesReview: (coordinates, index) => {
           ctx.sidebarRight.openResource(changesReviewAddress(coordinates), { params: { index } })
         },
@@ -84,12 +86,13 @@ export function apply(ctx: ClientContext): void {
   ctx.effect(() => ctx.slots.inject('sidebar.right.pane.tab', () => ctx.slots.register(
     {
       name: 'sidebar.right.pane.tab', key: CHANGES_REVIEW_ID, locale: NS, store: createReviewStore(),
+      children: { 'deliverables.file.actions': { kind: 'list', scope: 'session' } },
       inject: (): ReviewInjected => ({
         hooks: { changesSummary: summaries.state, changesDiff: diffs.state, presentedOpen: opener.state, presentedHost: opener.host },
         loadChangesSummary: (sessionId, seq) => summaries.load(sessionId, seq),
         loadChangesDiff: (sessionId, seq, index) => diffs.load(sessionId, seq, index),
         reloadPresentedHost: () => opener.loadHost(),
-        openChanged: (sessionId, seq, index) => opener.openChanged(sessionId, seq, index),
+        openChanged: (sessionId, seq, index, action, application) => opener.openChanged(sessionId, seq, index, action, application),
       }),
     },
     ReviewTab,
diff --git a/packages/client/ui-deliverables/src/client/locales.ts b/packages/client/ui-deliverables/src/client/locales.ts
index 7eacc52c34..4ed0595bc3 100644
--- a/packages/client/ui-deliverables/src/client/locales.ts
+++ b/packages/client/ui-deliverables/src/client/locales.ts
@@ -15,12 +15,6 @@ export const zh = {
   'presented.unavailable': '此主机没有可用的桌面，无法使用外部程序打开文件或文件夹；文件仍可在侧边栏预览',
   'presented.retry': '重试',
   'presented.hostError': '无法读取主机桌面信息',
-  'presented.directory': '打开所在文件夹',
-  'presented.explorer': '在文件资源管理器中显示',
-  'presented.finder': '在 Finder 中显示',
-  'presented.defaultApp': '用默认应用打开',
-  'presented.more': '{name} 的更多文件操作',
-  'presented.action': '打开',
   'presented.preview': '在侧边栏预览',
   'presented.previewButton': '在侧边栏打开 {name}',
   'presented.previewCard': '在侧边栏预览 {name}',
@@ -59,7 +53,6 @@ export const zh = {
   'review.wrapAria': '自动换行',
   'review.openFile': '在侧边栏打开整个文件',
   'review.openFileAria': '在侧边栏打开 {name}',
-  'diff.openNativeAria': '用默认应用打开 {name}',
   'diff.loading': '正在读取改动…',
   'diff.missing': '这轮改动的内容已不可用',
   'diff.error': '无法读取改动',
@@ -70,8 +63,6 @@ export const zh = {
   'diff.unchanged': '两侧内容相同',
   'diff.coarse': '逐行对比超时，按整个文件替换显示',
   'diff.truncated': '只显示前 {count} 行',
-  'diff.openNative': '用默认应用打开',
-  'diff.openNativeError': '打开失败，点击重试',
 }
 
 /** English dictionary (same key set). */
@@ -86,12 +77,6 @@ export const en: Record<DeliverablesKey, string> = {
   'presented.unavailable': 'This Host has no desktop available to open files or folders in external apps. Files can still be previewed in the sidebar.',
   'presented.retry': 'Retry',
   'presented.hostError': 'Could not read the Host desktop information',
-  'presented.directory': 'Open containing folder',
-  'presented.explorer': 'Show in File Explorer',
-  'presented.finder': 'Show in Finder',
-  'presented.defaultApp': 'Open in default app',
-  'presented.more': 'More file actions for {name}',
-  'presented.action': 'Open',
   'presented.preview': 'Preview in sidebar',
   'presented.previewButton': 'Open {name} in sidebar',
   'presented.previewCard': 'Preview {name} in sidebar',
@@ -130,7 +115,6 @@ export const en: Record<DeliverablesKey, string> = {
   'review.wrapAria': 'Line wrap',
   'review.openFile': 'Open the whole file in the sidebar',
   'review.openFileAria': 'Open {name} in sidebar',
-  'diff.openNativeAria': 'Open {name} in default app',
   'diff.loading': 'Reading changes…',
   'diff.missing': 'The contents of this turn’s changes are no longer available',
   'diff.error': 'Could not read the changes',
@@ -141,8 +125,6 @@ export const en: Record<DeliverablesKey, string> = {
   'diff.unchanged': 'Both sides hold the same lines',
   'diff.coarse': 'Line comparison timed out; shown as a whole-file replacement',
   'diff.truncated': 'Showing the first {count} lines',
-  'diff.openNative': 'Open in default app',
-  'diff.openNativeError': 'Could not open. Click to retry.',
 }
 
 /** Union of this namespace's dictionary keys. */
diff --git a/packages/client/ui-deliverables/src/client/present-open.ts b/packages/client/ui-deliverables/src/client/present-open.ts
index d724816d19..92764884ef 100644
--- a/packages/client/ui-deliverables/src/client/present-open.ts
+++ b/packages/client/ui-deliverables/src/client/present-open.ts
@@ -4,7 +4,10 @@ import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import { changedFileUrl } from '../changes.ts'
 import { presentedFileUrl, PRESENT_HOST_ROUTE, isPresentedHost, type PresentedAction, type PresentedHost } from '../presented.ts'
 
-/** State of the latest explicit open gesture for one saved file. */
+/** Failure feedback for the shared native opening control. */
+export type PresentedOpenFailure = 'openError' | 'revealError' | null
+
+/** State published on the owning file card. */
 export type PresentedOpenPhase = 'opening' | 'opened' | 'revealing' | 'revealed' | 'error' | 'revealError' | 'nativeUnavailable'
 
 /** One browser plugin's file-open requests, cancelled when that plugin is disposed. */
@@ -16,7 +19,7 @@ export class PresentedOpenController {
   private loading: Promise<void> | undefined
   private metadata = new AbortController()
   private readonly lifetime = new AbortController()
-  private readonly pending = new Set<Promise<void>>()
+  private readonly pending = new Set<Promise<void | PresentedOpenFailure>>()
 
   /**
    * Open a declared file once while a request for the same coordinates is pending.
@@ -25,10 +28,13 @@ export class PresentedOpenController {
    * @param seq - durable delivery event sequence.
    * @param index - original file index within that event.
    * @param action - default application open or file-manager reveal.
-   * @returns after the Host acknowledges opening or the error state is published.
+   * @param application - registered handler identifier for an explicit application choice.
+   * @returns null after a successful handoff, or the failure to announce after publishing card status.
    */
-  open(sessionId: SessionId, seq: number, index: number, action: PresentedAction = 'open'): Promise<void> {
-    return this.openUrl(presentedFileUrl(sessionId, seq, index), action)
+  open(
+    sessionId: SessionId, seq: number, index: number, action: PresentedAction = 'open', application?: string,
+  ): Promise<PresentedOpenFailure> {
+    return this.openUrl(presentedFileUrl(sessionId, seq, index), action, application)
   }
 
   /**
@@ -36,20 +42,24 @@ export class PresentedOpenController {
    * @param sessionId - viewed Session.
    * @param seq - durable workspace/changes event sequence.
    * @param index - original file index within that event.
-   * @returns after the Host acknowledges opening or the error state is published.
+   * @param action - application open or file-manager reveal.
+   * @param application - registered handler identifier for an explicit application choice.
+   * @returns null after a successful handoff, or the failure to announce after publishing card status.
    */
-  openChanged(sessionId: SessionId, seq: number, index: number): Promise<void> {
-    return this.openUrl(changedFileUrl(sessionId, seq, index), 'open')
+  openChanged(
+    sessionId: SessionId, seq: number, index: number, action: PresentedAction = 'open', application?: string,
+  ): Promise<PresentedOpenFailure> {
+    return this.openUrl(changedFileUrl(sessionId, seq, index), action, application)
   }
 
-  private async openUrl(url: string, action: PresentedAction): Promise<void> {
+  private async openUrl(url: string, action: PresentedAction, application?: string): Promise<PresentedOpenFailure> {
     const phase = this.state.getSnapshot()[url]
-    if (this.lifetime.signal.aborted || phase === 'opening' || phase === 'revealing') return
+    if (this.lifetime.signal.aborted || phase === 'opening' || phase === 'revealing') return null
     this.state.update((state) => { state[url] = action === 'open' ? 'opening' : 'revealing' })
-    const task = this.request(url, action)
+    const task = this.request(url, action, application)
     this.pending.add(task)
     try {
-      await task
+      return await task
     } finally {
       this.pending.delete(task)
     }
@@ -103,16 +113,19 @@ export class PresentedOpenController {
     await Promise.all(this.pending)
   }
 
-  private async request(url: string, action: PresentedAction): Promise<void> {
+  private async request(url: string, action: PresentedAction, application?: string): Promise<PresentedOpenFailure> {
     const failure = action === 'open' ? 'error' : 'revealError'
     let phase: PresentedOpenPhase = action === 'open' ? 'opened' : 'revealed'
     try {
-      const response = await fetch(action === 'open' ? url : `${url}&action=reveal`, { method: 'POST', signal: this.lifetime.signal })
+      const target = action === 'reveal' ? `${url}&action=reveal`
+        : application === undefined ? url : `${url}&application=${encodeURIComponent(application)}`
+      const response = await fetch(target, { method: 'POST', signal: this.lifetime.signal })
       if (!response.ok) phase = response.status === 422 ? 'nativeUnavailable' : failure
     } catch {
       // Transport failures share the retryable card state with Host open failures.
       phase = failure
     }
     if (!this.lifetime.signal.aborted) this.state.update((state) => { state[url] = phase })
+    return phase === 'opened' || phase === 'revealed' ? null : action === 'reveal' ? 'revealError' : 'openError'
   }
 }
diff --git a/packages/client/ui-deliverables/src/present-open.ts b/packages/client/ui-deliverables/src/present-open.ts
index 56b88f0651..6023625644 100644
--- a/packages/client/ui-deliverables/src/present-open.ts
+++ b/packages/client/ui-deliverables/src/present-open.ts
@@ -34,12 +34,12 @@ export function registerPresentOpen(ctx: Context): void {
     await Promise.allSettled(pending)
   })
   const routes = [
-    [PRESENT_OPEN_PATH, 'POST', handlePresentOpen], [CHANGES_OPEN_PATH, 'POST', handleChangesOpen], [CHANGES_DIFF_PATH, 'GET', handleChangesDiff],
+    [PRESENT_OPEN_PATH, ['GET', 'POST'], handlePresentOpen], [CHANGES_OPEN_PATH, ['GET', 'POST'], handleChangesOpen], [CHANGES_DIFF_PATH, ['GET'], handleChangesDiff],
   ] as const
-  for (const [path, method, handler] of routes) {
+  for (const [path, methods, handler] of routes) {
     ctx.connection.fetch.register({
       path,
-      methods: [method],
+      methods: [...methods],
       requestBody: 'buffered',
       fetch: (request) => {
         const task = handler(ctx, new Request(request, {
@@ -91,7 +91,13 @@ async function openVerified(ctx: Context, request: Request, path: string, action
     return new Response('Path has no verified Host path.', { status: 422 })
   }
   request.signal.throwIfAborted()
-  await ctx.sessionController.openWorkspacePath({ path, ...(action === 'reveal' ? { action } : {}) }, request.signal)
+  if (request.method === 'GET') {
+    return Response.json(await ctx.sessionController.workspacePathApplications({ path }, request.signal),
+      { headers: { 'cache-control': 'no-store' } })
+  }
+  const application = new URL(request.url).searchParams.get('application')
+  await ctx.sessionController.openWorkspacePath({ path, ...(action === 'reveal' ? { action }
+    : application === null ? {} : { application }) }, request.signal)
   return new Response(null, { status: 204, headers: { 'cache-control': 'no-store' } })
 }
 
@@ -159,6 +165,8 @@ async function handleChangesDiff(ctx: Context, request: Request): Promise<Respon
 }
 
 async function handleChangesOpen(ctx: Context, request: Request): Promise<Response> {
+  const action = new URL(request.url).searchParams.get('action') ?? 'open'
+  if (action !== 'open' && action !== 'reveal') return new Response('Invalid file action.', { status: 400 })
   const coordinates = changedFileCoordinates(request)
   if (coordinates instanceof Response) return coordinates
   const { id, seq, index } = coordinates
@@ -171,7 +179,7 @@ async function handleChangesOpen(ctx: Context, request: Request): Promise<Respon
     const file = changes.files[index]
     if (file === undefined) return new Response('Changed file not found in this summary.', { status: 404 })
     const { absolutePath: path } = await ctx.workspaceFiles.stat({ sessionId: id, workspaceRoot }, file.path, request.signal)
-    return await openVerified(ctx, request, path, 'open')
+    return await openVerified(ctx, request, path, action)
   } catch (error: unknown) {
     request.signal.throwIfAborted()
     return new Response('Changed file unavailable.', { status: failureStatus(error) })
diff --git a/packages/client/ui-deliverables/tests/changes-open.host.spec.ts b/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
index b391263de5..443287ed97 100644
--- a/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
+++ b/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
@@ -61,7 +61,8 @@ async function fixture() {
     sessionId === 'owner' && seq === 9 && index === 0 ? comparison : undefined)
   ctx.provide('workspaceChanges', { summary, diff })
   const opener = vi.fn(async (_request: { path: string; action?: 'reveal' }, _signal: AbortSignal) => ({ opened: true as const }))
-  ctx.provide('sessionController', { openWorkspacePath: opener, workspaceDesktop: () => ({ name: 'desktop', available: true, fileManager: 'finder' }) } as never)
+  const applications = vi.fn(async () => [{ id: 'player', name: 'Player', default: true, icon: null }])
+  ctx.provide('sessionController', { workspacePathApplications: applications, openWorkspacePath: opener, workspaceDesktop: () => ({ name: 'desktop', available: true, fileManager: 'finder' }) } as never)
   const connection = new HostConnectionService(ctx, [], {} as BrowserAuth)
   await ctx.plugin({
     inject: ['connection', 'sessionQuery', 'sessionController', 'workspaceFiles', 'fs', 'sandboxPolicy', 'workspaceChanges'],
@@ -71,7 +72,7 @@ async function fixture() {
   const open = (query = '?sessionId=owner&seq=9&index=0') => handler.fetch(new Request(`http://localhost${CHANGES_OPEN_PATH}${query}`, { method: 'POST' }))
   const read = (query = '?sessionId=owner&seq=9') => handler.fetch(new Request(`http://localhost${CHANGED_FILES_PATH}${query}`))
   const compare = (query = '?sessionId=owner&seq=9&index=0') => handler.fetch(new Request(`http://localhost${CHANGES_DIFF_PATH}${query}`))
-  return { root, cwd, ctx, data, readEvent, open, read, compare, comparison, diff, opener, outside, summary }
+  return { handler, applications, root, cwd, ctx, data, readEvent, open, read, compare, comparison, diff, opener, outside, summary }
 }
 
 describe('change summary route', () => {
@@ -199,3 +200,19 @@ describe('changed files native open route', () => {
     expect(isChangesEvent(null)).toBe(false)
   })
 })
+
+
+it('queries handlers only after file authorization and forwards explicit application choices', async () => {
+  const { handler, applications, opener, open, ctx } = await fixture()
+  const url = 'http://localhost/api/changes.open?sessionId=owner&seq=9&index=0'
+  const response = await handler.fetch(new Request(url))
+  expect(response.status).toBe(200)
+  expect(await response.json()).toEqual([{ id: 'player', name: 'Player', default: true, icon: null }])
+  expect(opener).not.toHaveBeenCalled()
+  expect((await open('?sessionId=owner&seq=9&index=0&application=player')).status).toBe(204)
+  expect(opener.mock.lastCall?.[0]).toMatchObject({ application: 'player' })
+  expect((await handler.fetch(new Request(url.replace('index=0', 'index=999')))).status).toBe(404)
+  vi.spyOn(ctx.fs, 'processPathFromHostPath').mockReturnValue(undefined)
+  expect((await handler.fetch(new Request(url))).status).toBe(422)
+  expect(applications).toHaveBeenCalledOnce()
+})
diff --git a/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx b/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
index c6cb256373..65ead43368 100644
--- a/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
+++ b/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
@@ -6,6 +6,7 @@
  * registrations' fiber-teardown removal (HMR safety) against the real
  * SlotRegistry.
  */
+import { renderFileActions } from './file-actions.tsx'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import { Context } from '@deepseek-ai/cordis'
 import { cleanup, fireEvent, render, within } from '@testing-library/react'
@@ -41,6 +42,7 @@ function openProps(controller = new PresentedOpenController(), summaries = new C
   controller.host.set({ name: 'desktop', available: true, fileManager: 'finder' })
   const sessions: SessionListState = { ids: [], byId: {}, phase: 'ready', projectionsBySession: {}, jobsBySession: {} }
   return {
+    renderSlot: renderFileActions,
     useShowCodeDiff: <T,>(select: (value: boolean) => T): T => select(true),
     useSessions: <T,>(select: (state: SessionListState) => T): T => select(sessions),
     reloadPresentedHost: vi.fn(() => controller.loadHost()),
@@ -494,7 +496,7 @@ describe('ChangedFiles card', () => {
     controller = new PresentedOpenController(), locale = en, matched = { changes, presented: [] as never[] }, summaries = servedStore(),
   ) {
     const props = openProps(controller, summaries)
-    props.openChanged.mockResolvedValue(undefined)
+    props.openChanged.mockResolvedValue(null)
     const openFile = vi.fn<(path: string) => void>()
     const view = render(<Deliverables {...props} matched={matched} openFile={openFile} sessionId={SessionId('child-session')} t={makeTranslate(locale)} />)
     return { props, openFile, view }
@@ -845,7 +847,7 @@ describe('presented files', () => {
     const owner = tailOwner(deliverablesOf(value), 3, preview)
     const matched = selectDeliverables(owner)!
     const props = openProps()
-    props.openPresented.mockResolvedValue(undefined)
+    props.openPresented.mockResolvedValue(null)
     const view = render(<Deliverables {...props} matched={matched} openFile={owner.openFile} sessionId={SessionId('child-session')} t={makeTranslate(en)} />)
     expect(view.container.querySelectorAll('[data-presented-file]')).toHaveLength(4)
     const expand = view.getByRole('button', { name: 'Show all 8 delivered files' })
@@ -855,12 +857,10 @@ describe('presented files', () => {
     expect(view.getByRole('button', { name: 'Collapse delivered files' }).getAttribute('aria-expanded')).toBe('true')
     expect(view.queryByRole('link')).toBeNull()
     fireEvent.click(view.getByRole('button', { name: 'Preview report-0.docx in sidebar' }))
-    fireEvent.click(view.getByRole('button', { name: 'Open report-0.docx in sidebar' }))
-    expect(preview).toHaveBeenCalledTimes(2)
+    expect(preview).toHaveBeenCalledTimes(1)
     expect(preview).toHaveBeenLastCalledWith('report-0.docx')
-    fireEvent.click(view.getByRole('button', { name: 'More file actions for report-0.docx' }))
-    fireEvent.click(view.getByRole('menuitem', { name: 'Open in default app' }))
-    expect(props.openPresented).toHaveBeenCalledWith('child-session', 2, 0, 'open')
+    fireEvent.click(view.getAllByRole('button', { name: 'Native file action' })[0]!)
+    expect(props.openPresented).toHaveBeenCalledWith('child-session', 2, 0, 'open', undefined)
     fireEvent.click(view.getByRole('button', { name: 'Collapse delivered files' }))
     expect(view.container.querySelectorAll('[data-presented-file]')).toHaveLength(4)
     expect(view.container.querySelector('[data-changed-files]')).toBeNull()
@@ -934,7 +934,7 @@ it.each(['opening', 'opened', 'error'] as const)('shows the %s state and permits
     { path: 'report.txt', seq: 2, index: 0 },
   ] }} openFile={() => {}} sessionId={SessionId('session')} t={makeTranslate(en)} />)
   expect(view.getByText(en[`presented.${phase}`])).toBeTruthy()
-  expect((view.getByRole('button', { name: 'More file actions for report.txt' }) as HTMLButtonElement).disabled).toBe(phase === 'opening')
+  expect((view.getByRole('button', { name: 'Native file action' }) as HTMLButtonElement).disabled).toBe(phase === 'opening')
 })
 
 
diff --git a/packages/client/ui-deliverables/tests/file-actions.tsx b/packages/client/ui-deliverables/tests/file-actions.tsx
new file mode 100644
index 0000000000..964b7b88b1
--- /dev/null
+++ b/packages/client/ui-deliverables/tests/file-actions.tsx
@@ -0,0 +1,8 @@
+/** Capture delivery action ownership without duplicating the opening-control implementation. */
+import type { PropsRenderSlots } from '@deepseek-ai/dsh-client-ui-slots'
+import type {} from '../src/client/index.ts'
+
+/** Slot renderer exposing the owning route and gesture for component tests. */
+export const renderFileActions: PropsRenderSlots<'deliverables.file.actions'>['renderSlot'] = (_name, props) =>
+  props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
+    onClick={() => { void props.onAction('open') }}>Native file action</button> : null
diff --git a/packages/client/ui-deliverables/tests/present-open.host.spec.ts b/packages/client/ui-deliverables/tests/present-open.host.spec.ts
index 072529cdde..b4e80a0b0e 100644
--- a/packages/client/ui-deliverables/tests/present-open.host.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.host.spec.ts
@@ -46,7 +46,8 @@ async function fixture() {
   })
   ctx.provide('sessionQuery', { readEvent } as never)
   const opener = vi.fn(async (_request: { path: string; action?: 'reveal' }, _signal: AbortSignal) => ({ opened: true as const }))
-  ctx.provide('sessionController', { resolveAgent, openWorkspacePath: opener, workspaceDesktop: () => ({ name: 'desktop', available: true, fileManager: 'finder' }) } as never)
+  const applications = vi.fn(async () => [{ id: 'player', name: 'Player', default: true, icon: null }])
+  ctx.provide('sessionController', { workspacePathApplications: applications, resolveAgent, openWorkspacePath: opener, workspaceDesktop: () => ({ name: 'desktop', available: true, fileManager: 'finder' }) } as never)
   const connection = new HostConnectionService(ctx, [], {} as BrowserAuth)
   const fiber = ctx.plugin({ inject: ['connection', 'sessionQuery', 'sessionController', 'workspaceFiles', 'fs', 'sandboxPolicy'], apply: registerPresentOpen })
   await fiber
@@ -54,7 +55,7 @@ async function fixture() {
   const open = (query = '?sessionId=owner&seq=7&index=0', signal?: AbortSignal) => handler.fetch(new Request(
     `http://localhost${PRESENT_OPEN_PATH}${query}`, { method: 'POST', signal: signal ?? null },
   ))
-  return { root, cwd, ctx, fiber, file, session, readEvent, open, opener, handler, resolveAgent }
+  return { applications, root, cwd, ctx, fiber, file, session, readEvent, open, opener, handler, resolveAgent }
 }
 
 describe('Presented workspace file native open route', () => {
@@ -233,3 +234,19 @@ it('uses the deployment workspace root when the viewed Session has no cwd', asyn
   expect((await open()).status).toBe(204)
   expect(opener.mock.lastCall?.[0].path).toBe(await realpath(join(cwd, file.path)))
 })
+
+
+it('queries handlers only after file authorization and forwards explicit application choices', async () => {
+  const { handler, applications, opener, open, ctx } = await fixture()
+  const url = 'http://localhost/api/present.open?sessionId=owner&seq=7&index=0'
+  const response = await handler.fetch(new Request(url))
+  expect(response.status).toBe(200)
+  expect(await response.json()).toEqual([{ id: 'player', name: 'Player', default: true, icon: null }])
+  expect(opener).not.toHaveBeenCalled()
+  expect((await open('?sessionId=owner&seq=7&index=0&application=player')).status).toBe(204)
+  expect(opener.mock.lastCall?.[0]).toMatchObject({ application: 'player' })
+  expect((await handler.fetch(new Request(url.replace('index=0', 'index=999')))).status).toBe(404)
+  vi.spyOn(ctx.fs, 'processPathFromHostPath').mockReturnValue(undefined)
+  expect((await handler.fetch(new Request(url))).status).toBe(422)
+  expect(applications).toHaveBeenCalledOnce()
+})
diff --git a/packages/client/ui-deliverables/tests/presented-file-card.client.spec.tsx b/packages/client/ui-deliverables/tests/presented-file-card.client.spec.tsx
index 28207b5a29..62a017f33a 100644
--- a/packages/client/ui-deliverables/tests/presented-file-card.client.spec.tsx
+++ b/packages/client/ui-deliverables/tests/presented-file-card.client.spec.tsx
@@ -13,66 +13,9 @@ const props = () => ({
   host: { name: 'remote-desktop', available: true, fileManager: 'finder' as const },
   phase: undefined,
   onPreview: vi.fn(),
-  onAction: vi.fn(),
+  actions: <button type="button">Native file action</button>,
   t: makeTranslate(en),
 })
-
-it.each([
-  ['finder', 'Show in Finder'], ['explorer', 'Show in File Explorer'], ['directory', 'Open containing folder'],
-] as const)('uses the Host %s action and closes the menu after selection', (fileManager, label) => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} host={{ ...p.host, fileManager }} />)
-  fireEvent.click(view.getByRole('button', { name: 'More file actions for out/report.pdf' }))
-  fireEvent.click(view.getByRole('menuitem', { name: new RegExp(label) }))
-  expect(p.onAction).toHaveBeenCalledWith('reveal')
-  expect(view.queryByRole('menu')).toBeNull()
-  fireEvent.click(view.getByRole('button', { name: 'More file actions for out/report.pdf' }))
-  fireEvent.click(view.getByRole('menuitem', { name: /Open in default app/ }))
-  expect(p.onAction).toHaveBeenLastCalledWith('open')
-  expect(p.onAction).toHaveBeenCalledTimes(2)
-})
-
-it('dismisses the menu with Escape or an outside click without launching anything', () => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} />)
-  const trigger = view.getByRole('button', { name: 'More file actions for out/report.pdf' })
-  fireEvent.click(trigger)
-  fireEvent.keyDown(document, { key: 'Escape' })
-  expect(view.queryByRole('menu')).toBeNull()
-  fireEvent.click(trigger)
-  fireEvent.pointerDown(document.body)
-  expect(view.queryByRole('menu')).toBeNull()
-  expect(p.onAction).not.toHaveBeenCalled()
-})
-
-it.each(['opening', 'revealing'] as const)('keeps sidebar previews available while the native action is %s', (phase) => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} phase={phase} />)
-  expect((view.getByRole('button', { name: 'More file actions for out/report.pdf' }) as HTMLButtonElement).disabled).toBe(true)
-  fireEvent.click(view.getByRole('button', { name: 'Preview out/report.pdf in sidebar' }))
-  fireEvent.click(view.getByRole('button', { name: 'Open out/report.pdf in sidebar' }))
-  expect(p.onPreview).toHaveBeenCalledTimes(2)
-  expect(p.onAction).not.toHaveBeenCalled()
-})
-
-it('keeps the native menu disabled until a desktop is available', () => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} host={null} />)
-  expect((view.getByRole('button', { name: 'More file actions for out/report.pdf' }) as HTMLButtonElement).disabled).toBe(true)
-  expect((view.getByRole('button', { name: 'Open out/report.pdf in sidebar' }) as HTMLButtonElement).disabled).toBe(false)
-  view.rerender(<PresentedFileCard {...p} host={{ ...p.host, available: false, fileManager: null }} />)
-  expect((view.getByRole('button', { name: 'More file actions for out/report.pdf' }) as HTMLButtonElement).disabled).toBe(true)
-})
-
-it('opens the right sidebar from either the card or its primary button', () => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} />)
-  fireEvent.click(view.getByRole('button', { name: 'Preview out/report.pdf in sidebar' }))
-  fireEvent.click(view.getByRole('button', { name: 'Open out/report.pdf in sidebar' }))
-  expect(p.onPreview).toHaveBeenCalledTimes(2)
-  expect(p.onAction).not.toHaveBeenCalled()
-})
-
 it('localizes reveal failures and accurately reports a directory-only action', () => {
   const p = props()
   const view = render(<PresentedFileCard {...p} phase="revealError" t={makeTranslate(zh)} />)
@@ -84,36 +27,12 @@ it('localizes reveal failures and accurately reports a directory-only action', (
 })
 
 
-it('supports keyboard selection and returns focus to the trigger on Escape', () => {
-  const view = render(<PresentedFileCard {...props()} />)
-  const trigger = view.getByRole('button', { name: 'More file actions for out/report.pdf' })
-  fireEvent.click(trigger)
-  const items = view.getAllByRole('menuitem')
-  expect(document.activeElement).toBe(items[0])
-  fireEvent.keyDown(document.activeElement!, { key: 'ArrowDown' })
-  expect(document.activeElement).toBe(items[1])
-  fireEvent.keyDown(document.activeElement!, { key: 'ArrowDown' })
-  expect(document.activeElement).toBe(items[0])
-  fireEvent.keyDown(document.activeElement!, { key: 'End' })
-  expect(document.activeElement).toBe(items[1])
-  fireEvent.keyDown(document.activeElement!, { key: 'ArrowUp' })
-  expect(document.activeElement).toBe(items[0])
-  fireEvent.keyDown(document.activeElement!, { key: 'Home' })
-  expect(document.activeElement).toBe(items[0])
-  fireEvent.keyDown(document.activeElement!, { key: 'Escape' })
-  expect(document.activeElement).toBe(trigger)
-})
-
-
 it('shows the basename while retaining the full location for hover and actions', () => {
   const p = props()
   const path = '/work/reports/result.pdf'
   const view = render(<PresentedFileCard {...p} cwd="/work" file={{ ...p.file, path }} />)
   expect(view.getByTitle(path)).toBeTruthy()
   expect(view.getByText('result.pdf')).toBeTruthy()
-  fireEvent.click(view.getByRole('button', { name: `More file actions for ${path}` }))
-  fireEvent.click(view.getByRole('menuitem', { name: 'Open in default app' }))
-  expect(p.onAction).toHaveBeenCalledWith('open')
   view.rerender(<PresentedFileCard {...p} cwd="/work" />)
   expect(view.getByTitle('/work/out/report.pdf')).toBeTruthy()
   expect(view.getByText('report.pdf')).toBeTruthy()
@@ -130,31 +49,6 @@ it.each([
 })
 
 
-it('does not reopen a menu after a shared native request settles', () => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} />)
-  fireEvent.click(view.getByRole('button', { name: 'More file actions for out/report.pdf' }))
-  expect(view.getByRole('menu')).toBeTruthy()
-  view.rerender(<PresentedFileCard {...p} phase="opening" />)
-  expect(view.queryByRole('menu')).toBeNull()
-  view.rerender(<PresentedFileCard {...p} phase="opened" />)
-  expect(view.queryByRole('menu')).toBeNull()
-})
-
-it('keeps focus on the available preview button after selecting a native action', () => {
-  const p = props()
-  const view = render(<PresentedFileCard {...p} />)
-  fireEvent.click(view.getByRole('button', { name: 'More file actions for out/report.pdf' }))
-  const item = view.getByRole('menuitem', { name: 'Show in Finder' })
-  item.focus()
-  fireEvent.click(item)
-  view.rerender(<PresentedFileCard {...p} phase="revealing" />)
-  const preview = view.getByRole('button', { name: 'Open out/report.pdf in sidebar' })
-  expect(document.activeElement).toBe(preview)
-  view.rerender(<PresentedFileCard {...p} phase="revealed" />)
-  expect(document.activeElement).toBe(preview)
-})
-
 it.each([en, zh])('distinguishes directory-only progress and errors in each locale', (dictionary) => {
   const p = { ...props(), t: makeTranslate(dictionary) }
   const view = render(<PresentedFileCard {...p} phase="revealing" />)
@@ -164,3 +58,15 @@ it.each([en, zh])('distinguishes directory-only progress and errors in each loca
   view.rerender(<PresentedFileCard {...p} phase="revealError" host={{ ...p.host, fileManager: 'directory' }} />)
   expect(view.getByText(dictionary['presented.directoryError'])).toBeTruthy()
 })
+
+
+it('renders the supplied action independently from the card preview', () => {
+  const p = props()
+  const native = vi.fn()
+  const view = render(<PresentedFileCard {...p} actions={<button type="button" onClick={native}>Native file action</button>} />)
+  fireEvent.click(view.getByRole('button', { name: 'Native file action' }))
+  expect(native).toHaveBeenCalledOnce()
+  expect(p.onPreview).not.toHaveBeenCalled()
+  fireEvent.click(view.getByRole('button', { name: 'Preview out/report.pdf in sidebar' }))
+  expect(p.onPreview).toHaveBeenCalledOnce()
+})
diff --git a/packages/client/ui-deliverables/tests/review-tab.client.spec.tsx b/packages/client/ui-deliverables/tests/review-tab.client.spec.tsx
index 9cdc89ec65..7d412a09cc 100644
--- a/packages/client/ui-deliverables/tests/review-tab.client.spec.tsx
+++ b/packages/client/ui-deliverables/tests/review-tab.client.spec.tsx
@@ -1,5 +1,6 @@
 // @vitest-environment jsdom
 /** The review tab type: its addresses, its store, the row pairing of the split view, and the states its body draws. */
+import { renderFileActions } from './file-actions.tsx'
 import { useSyncExternalStore } from 'react'
 import { act, cleanup, fireEvent, render } from '@testing-library/react'
 import { afterEach, describe, expect, it, vi } from 'vitest'
@@ -158,11 +159,17 @@ describe('ReviewTab', () => {
       loadChangesSummary: vi.fn<ReviewInjected['loadChangesSummary']>(() => Promise.resolve()),
       loadChangesDiff: vi.fn<ReviewInjected['loadChangesDiff']>(() => Promise.resolve()),
       reloadPresentedHost: vi.fn<ReviewInjected['reloadPresentedHost']>(() => Promise.resolve()),
-      openChanged: vi.fn<ReviewInjected['openChanged']>(() => Promise.resolve()),
+      openChanged: vi.fn<ReviewInjected['openChanged']>(() => Promise.resolve(null)),
+    }
+    const sessions: SessionListState = {
+      ids: [SESSION],
+      byId: { [SESSION]: { id: SESSION, displayTitle: 'Workspace', cwd: options.cwd ?? '/work/app',
+        running: false, retainedBy: {}, blank: false, updatedAt: 0 } },
+      phase: 'ready', projectionsBySession: {}, jobsBySession: {},
     }
-    const sessions = { byId: { [SESSION]: { cwd: options.cwd ?? '/work/app' } } } as unknown as SessionListState
     const navigation = { address: options.address ?? ADDRESS, params: options.params, revision: options.revision ?? 1 }
     const runtime = {
+      renderSlot: renderFileActions,
       useTabInfo: () => ({
         sidebar: { expanded: true, fullscreen: false }, panel: { id: 'pane-1' },
         tab: { id: TAB, kind: 'changes-review', contentId: options.address ?? ADDRESS, title: 'Review', visible: true, navigation, signal: aborter.signal, actions: tabActions },
@@ -177,7 +184,7 @@ describe('ReviewTab', () => {
       usePresentedHost: hookOf(controller.host),
       t: makeTranslate(options.locale ?? en),
       ...injected,
-    } as unknown as ReviewTabProps
+    } as ReviewTabProps
     const view = render(<ReviewTab {...runtime} />)
     return {
       view, injected, tabActions, store, aborter, summaries, diffs, controller,
@@ -313,19 +320,18 @@ describe('ReviewTab', () => {
     expect(view.container.querySelector('[data-review-tool="open-file"] svg')?.getAttribute('width')).toBe('12')
     fireEvent.click(view.getByRole('button', { name: 'Open ~/out/big.bin in sidebar' }))
     expect(tabActions.openResource).toHaveBeenCalledWith(fileAddressFor(SESSION, '/work/app', '/tmp/out/big.bin'))
-    fireEvent.click(view.getByRole('button', { name: 'Open ~/out/big.bin in default app' }))
-    expect(injected.openChanged).toHaveBeenCalledWith('viewed', 5, 1)
+    fireEvent.click(view.getByRole('button', { name: 'Native file action' }))
+    expect(injected.openChanged).toHaveBeenCalledWith('viewed', 5, 1, 'open', undefined)
     act(() => { controller.state.set({ 'api/changes.open?sessionId=viewed&seq=5&index=1': 'opening' }) })
-    expect((view.getByRole('button', { name: 'Open ~/out/big.bin in default app' }) as HTMLButtonElement).disabled).toBe(true)
+    expect((view.getByRole('button', { name: 'Native file action' }) as HTMLButtonElement).disabled).toBe(true)
     act(() => { controller.state.set({ 'api/changes.open?sessionId=viewed&seq=5&index=1': 'error' }) })
-    expect(view.getByRole('button', { name: 'Open ~/out/big.bin in default app' }).hasAttribute('data-error')).toBe(true)
     act(() => { controller.state.set({ 'api/changes.open?sessionId=viewed&seq=5&index=1': 'nativeUnavailable' }) })
-    expect(view.queryByRole('button', { name: 'Open ~/out/big.bin in default app' })).toBeNull()
+    expect(view.queryByRole('button', { name: 'Native file action' })).toBeNull()
     act(() => {
       controller.state.set({})
       controller.host.set({ name: 'server', available: false, fileManager: null })
     })
-    expect(view.queryByRole('button', { name: 'Open ~/out/big.bin in default app' })).toBeNull()
+    expect(view.queryByRole('button', { name: 'Native file action' })).toBeNull()
     expect(view.getByText(en['changes.oversized'])).toBeTruthy()
   })
 
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index a52f9a0e85..9f87aff18b 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: 035315fa4c770b51614c7cf90064bed9ee00951e
-README.zh.md: 248ed5335a30e5101fb10aa95a7a77a6eb73725e
+README.md: 010f86f19297db33511b40129d6caf36c71e49f9
+README.zh.md: ec0fe7741356c71b73f4d5de6f5dc0bb1b3be887
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index 035315fa4c..010f86f192 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -45,7 +45,7 @@ File associations refresh when the file changes or its menu opens; cancelled que
 
 The plugin registers the split button on `conversation.session.header.utilities` through the standard slot/inject currency and registers the `open-in-app` dictionaries as one effect. A page-lifetime controller ([`src/client/controller.ts`](src/client/controller.ts)) owns the once-per-page availability read, the persisted choice snapshot store, and the launch POST; the component receives both stores through the inject `hooks` compartment, so every Session header shares one truth. Document-relative route forms and wire payload types come from the host package's browser-safe `@deepseek-ai/dsh-host-open-in-app/shared` subpath. In-flight launches are guarded by a ref — repeat clicks and menu picks during a launch are ignored whole (a pick would otherwise persist a choice the gesture never opened) — and the busy/error dress is timer-driven around the `launch` promise.
 
-The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while `OpenPathInjected.applications` queries `session.workspacePathApplications` through [`open-path.ts`](src/client/open-path.ts). Opening uses `session.openWorkspacePath`; the Host revalidates an explicitly selected handler before launch. The directory adapter keeps the existing catalog routes. A failed or unavailable file query therefore needs no platform-specific UI implementation.
+The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while `OpenPathInjected.applications` queries `session.workspacePathApplications` through [`open-path.ts`](src/client/open-path.ts). Opening uses `session.openWorkspacePath`; the Host revalidates an explicitly selected handler before launch. The directory adapter keeps the existing catalog routes. `FileRouteAction` supplies the same control to delivery cards and change review through `deliverables.file.actions`; their authenticated routes retain Session file authorization. A failed or unavailable file query therefore needs no platform-specific UI implementation.
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 248ed5335a..ec0fe77413 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -45,7 +45,7 @@ kind: "package-reference"
 
 插件通过标准 slot/inject 机制把分体按钮注册到 `conversation.session.header.utilities`，并以一个 effect 注册 `open-in-app` 词典。一个页面生命周期的 controller（[`src/client/controller.ts`](src/client/controller.ts)）拥有每页一次的可用性读取、持久化选择的 snapshot store 与启动 POST；组件经 inject 的 `hooks` 隔间接收两个 store，因此所有会话头部共享同一份事实。文档相对的路由形式与 wire 载荷类型来自主机包的浏览器安全子路径 `@deepseek-ai/dsh-host-open-in-app/shared`。飞行中的启动由 ref 守卫——启动期间的重复点击与菜单选择被整体忽略（否则会持久化一个该手势从未打开的选择）——busy/error 视觉由围绕 `launch` promise 的定时器驱动。
 
-目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，`OpenPathInjected.applications` 通过 [`open-path.ts`](src/client/open-path.ts) 查询 `session.workspacePathApplications`。打开操作使用 `session.openWorkspacePath`，Host 在启动前重新验证指定的关联应用。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
+目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，`OpenPathInjected.applications` 通过 [`open-path.ts`](src/client/open-path.ts) 查询 `session.workspacePathApplications`。打开操作使用 `session.openWorkspacePath`，Host 在启动前重新验证指定的关联应用。`FileRouteAction` 通过 `deliverables.file.actions` 为交付卡片和变更对比页提供同一控件，其认证路由保留会话文件校验。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
 
 </details>
 
diff --git a/packages/client/ui-open-in-app/package.json b/packages/client/ui-open-in-app/package.json
index 3b9e784afb..fde52fc3e9 100644
--- a/packages/client/ui-open-in-app/package.json
+++ b/packages/client/ui-open-in-app/package.json
@@ -70,6 +70,8 @@
     "@deepseek-ai/dsh-host-open-in-app": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
     "@types/react": "~18.3.1",
-    "react": "^18.2.0"
+    "react": "^18.2.0",
+    "@deepseek-ai/dsh-client-ui-deliverables": "workspace:^",
+    "@deepseek-ai/dsh-native-command": "workspace:^"
   }
 }
diff --git a/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx b/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
new file mode 100644
index 0000000000..287b4b3956
--- /dev/null
+++ b/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
@@ -0,0 +1,37 @@
+/** Adapt authorized delivery and changed-file routes to the shared opening control. */
+import type { PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
+import type {} from '@deepseek-ai/dsh-client-ui-deliverables/client'
+import { parseNativeFileApplications } from '@deepseek-ai/dsh-native-command/types'
+import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
+import { useFileApplications } from './file-applications.ts'
+import { OpenTargetButton } from './OpenTargetButton.tsx'
+import type { NS } from './locales.ts'
+
+async function queryRoute(url: string, signal: AbortSignal): Promise<readonly SessionWorkspacePathApplication[] | null> {
+  try {
+    const response = await fetch(url, { signal })
+    if (!response.ok) return null
+    return parseNativeFileApplications(await response.json())
+  } catch (_error) {
+    // Unavailable routes and malformed responses leave file reveal as the fallback.
+    return null
+  }
+}
+
+/**
+ * Render file actions without bypassing the owning Session's authorization route.
+ * @param props - authenticated route, desktop availability, and native gesture callback.
+ * @returns the shared compact control, or null without a desktop.
+ */
+export function FileRouteAction(
+  props: Pick<PropsRuntime<'deliverables.file.actions'>, 'actionUrl' | 'available' | 'pending' | 'onAction'> & PropsLocale<typeof NS>,
+) {
+  const association = useFileApplications(props.actionUrl, queryRoute, props.available)
+  if (!props.available) return null
+  return <OpenTargetButton key={props.actionUrl} kind="file" applications={association.apps}
+    defaultId={association.apps.find(app => app.default)?.id} failed={association.failed}
+    loading={association.loading || props.pending} refresh={association.refresh} t={props.t}
+    execute={async (operation) => {
+      return props.onAction(operation.kind === 'reveal' ? 'reveal' : 'open', operation.kind === 'application' ? operation.id : undefined)
+    }} />
+}
diff --git a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
index 869aa8e041..2b6008d9b1 100644
--- a/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenPathAction.tsx
@@ -1,11 +1,12 @@
 /** File association adapter for the shared file/directory opening control. */
-import { useEffect, useState } from 'react'
+import { useEffect } from 'react'
 import type { ReactNode } from 'react'
 import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
 import type { ObservableSnapshot } from '@deepseek-ai/dsh-client-store'
 import type { InjectFace, PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client'
 import type { OpenInAppPathAction, OpenInAppPathFailure } from './open-path.ts'
+import { useFileApplications } from './file-applications.ts'
 import { OpenTargetButton } from './OpenTargetButton.tsx'
 import type { NS } from './locales.ts'
 
@@ -37,30 +38,18 @@ type FileOpenTargetProps = Pick<OpenPathActionProps, 'absolutePath' | 'useOpenIn
  */
 export function FileOpenTarget(props: FileOpenTargetProps): ReactNode {
   const desktop = props.useOpenInAppDesktop(value => value)
-  const [revision, setRevision] = useState(0)
-  const [association, setAssociation] = useState<{
-    path: string
-    apps: readonly SessionWorkspacePathApplication[] | null
-  } | null>(null)
+  const association = useFileApplications(props.absolutePath, props.applications, desktop === true)
   useEffect(() => {
     if (desktop === null) void props.loadDesktop()
   }, [desktop, props.loadDesktop])
-  useEffect(() => {
-    if (desktop !== true) return
-    const controller = new AbortController()
-    void props.applications(props.absolutePath, controller.signal).then((apps) => {
-      if (!controller.signal.aborted) setAssociation({ path: props.absolutePath, apps })
-    })
-    return () => { controller.abort() }
-  }, [desktop, props.absolutePath, props.applications, revision])
   if (desktop !== true) return null
-  const apps = association?.path === props.absolutePath ? association.apps : null
+  const { apps } = association
   return (
     <OpenTargetButton
-      key={props.absolutePath} kind="file" applications={apps ?? []} defaultId={apps?.find(app => app.default)?.id}
-      loading={association?.path !== props.absolutePath} failed={association?.path === props.absolutePath && apps === null}
+      key={props.absolutePath} kind="file" applications={apps} defaultId={apps.find(app => app.default)?.id}
+      loading={association.loading} failed={association.failed}
       prominent={props.empty === true} t={props.t}
-      refresh={() => { setRevision(value => value + 1) }}
+      refresh={association.refresh}
       execute={operation => props.openPath(props.absolutePath, operation.kind === 'reveal' ? 'reveal' : 'open',
         operation.kind === 'application' ? operation.id : undefined)}
     />
diff --git a/packages/client/ui-open-in-app/src/client/file-applications.ts b/packages/client/ui-open-in-app/src/client/file-applications.ts
new file mode 100644
index 0000000000..00bb9331f2
--- /dev/null
+++ b/packages/client/ui-open-in-app/src/client/file-applications.ts
@@ -0,0 +1,37 @@
+/** File association reads shared by path previews and authorized delivery routes. */
+import { useEffect, useState } from 'react'
+import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
+
+/**
+ * Refresh associations on target changes and explicit menu opening; discard cancelled reads.
+ * @param target - path or authenticated route identifying the current file.
+ * @param query - target-specific association reader.
+ * @param enabled - whether a native desktop is available.
+ * @returns metadata, initial loading state, failure state, and a refresh callback.
+ */
+export function useFileApplications(
+  target: string,
+  query: (target: string, signal: AbortSignal) => Promise<readonly SessionWorkspacePathApplication[] | null>,
+  enabled: boolean,
+) {
+  const [revision, setRevision] = useState(0)
+  const [association, setAssociation] = useState<{
+    target: string
+    apps: readonly SessionWorkspacePathApplication[] | null
+  } | null>(null)
+  useEffect(() => {
+    if (!enabled) return
+    const controller = new AbortController()
+    void query(target, controller.signal).then((apps) => {
+      if (!controller.signal.aborted) setAssociation({ target, apps })
+    })
+    return () => { controller.abort() }
+  }, [enabled, target, query, revision])
+  const apps = association?.target === target ? association.apps : null
+  return {
+    apps: apps ?? [],
+    loading: association?.target !== target,
+    failed: association?.target === target && apps === null,
+    refresh: () => { setRevision(value => value + 1) },
+  }
+}
diff --git a/packages/client/ui-open-in-app/src/client/index.ts b/packages/client/ui-open-in-app/src/client/index.ts
index 44572cdf3d..e80e58189a 100644
--- a/packages/client/ui-open-in-app/src/client/index.ts
+++ b/packages/client/ui-open-in-app/src/client/index.ts
@@ -22,6 +22,7 @@ import { OpenInAppController } from './controller.ts'
 import { OpenInAppAction, type OpenInAppActionInjected } from './OpenInAppAction.tsx'
 import { OpenInAppPathController } from './open-path.ts'
 import { OpenPathAction, type OpenPathInjected } from './OpenPathAction.tsx'
+import { FileRouteAction } from './FileRouteAction.tsx'
 import { OpenPathEmptyAction } from './OpenPathEmptyAction.tsx'
 import { en, NS, zh, type OpenInAppKey } from './locales.ts'
 
@@ -83,4 +84,7 @@ export function apply(ctx: ClientContext): void {
     locale: NS,
     inject: pathInjected,
   }, OpenPathEmptyAction))
+  ctx.slots.inject('deliverables.file.actions', () => ctx.slots.register({
+    name: 'deliverables.file.actions', id: 'open-in-app', locale: NS,
+  }, FileRouteAction))
 }
diff --git a/packages/client/ui-open-in-app/src/client/locales.ts b/packages/client/ui-open-in-app/src/client/locales.ts
index 29845dc875..e8aedbdbf9 100644
--- a/packages/client/ui-open-in-app/src/client/locales.ts
+++ b/packages/client/ui-open-in-app/src/client/locales.ts
@@ -40,17 +40,11 @@ const PRODUCT_NAMES = {
 /** Simplified Chinese dictionary (the key-set source of truth). */
 export const zh = {
   'open.title': '用 {app} 打开',
-  'open.error': '打开失败',
-  'menu.toggle': '选择打开方式',
-  'menu.aria': '打开方式',
   'path.appDefault': '{app}（默认）',
   'path.appsError': '无法获取应用列表',
   'path.open': '打开',
-  'path.open.tooltip': '用默认应用打开',
   'path.more': '更多打开方式',
-  'path.defaultApp': '用默认应用打开',
   'path.reveal': '显示文件位置',
-  'path.unpreviewable': '用默认应用打开',
   'path.openError': '打开失败，请重试',
   'path.revealError': '无法显示文件位置，请重试',
   ...PRODUCT_NAMES,
@@ -63,17 +57,11 @@ export const zh = {
 /** English dictionary, key-identical to the Chinese source of truth. */
 export const en: Record<OpenInAppKey, string> = {
   'open.title': 'Open in {app}',
-  'open.error': 'Failed to open',
-  'menu.toggle': 'Choose an app to open in',
-  'menu.aria': 'Open in',
   'path.appDefault': '{app} (default)',
   'path.appsError': 'Could not load applications',
   'path.open': 'Open',
-  'path.open.tooltip': 'Open in default app',
   'path.more': 'More ways to open',
-  'path.defaultApp': 'Open in default app',
   'path.reveal': 'Show file location',
-  'path.unpreviewable': 'Open in default app',
   'path.openError': 'Could not open. Try again.',
   'path.revealError': 'Could not show the file location. Try again.',
   ...PRODUCT_NAMES,
diff --git a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
index da5f8f1c9b..e538dc4fd2 100644
--- a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
@@ -40,6 +40,7 @@ async function bench(): Promise<{ ctx: Context; fiber: ReturnType<Context['plugi
       'conversation.session.header.utilities': { kind: 'list', scope: 'session' },
       'sidebar.right.tab.document.actions': { kind: 'list', scope: 'session' },
       'sidebar.right.tab.document.unpreviewable': { kind: 'list', scope: 'session' },
+      'deliverables.file.actions': { kind: 'list', scope: 'session' },
     },
   } as never, () => null)
   ctx.provide('sessions', {})
@@ -67,6 +68,7 @@ describe('open-in-app browser half', () => {
     const empty = ctx.slots.entries('sidebar.right.tab.document.unpreviewable')[0]
     expect(header?.component).toBe(OpenPathAction)
     expect(empty?.component).toBe(OpenPathEmptyAction)
+    expect(ctx.slots.entries('deliverables.file.actions')).toHaveLength(1)
     expect(header?.options).toMatchObject({ id: 'open-in-app' })
     const face = (header?.inject as unknown as () => OpenPathInjected)()
     const emptyFace = (empty?.inject as unknown as () => OpenPathInjected)()
@@ -83,6 +85,7 @@ describe('open-in-app browser half', () => {
     await fiber.dispose()
     expect(ctx.slots.entries('sidebar.right.tab.document.actions').map(entry => entry.options.id)).not.toContain('open-in-app')
     expect(ctx.slots.entries('sidebar.right.tab.document.unpreviewable').map(entry => entry.options.id)).not.toContain('open-in-app')
+    expect(ctx.slots.entries('deliverables.file.actions')).toHaveLength(0)
   })
 
   it('registers the header split button, and fiber teardown removes it (HMR safety)', async () => {
@@ -147,11 +150,11 @@ describe('open-in-app browser half', () => {
     const { ctx, fiber } = await bench()
     ctx.locale.setLocale('zh')
     const translate = ctx.locale.bind(NS)
-    expect(translate('menu.aria')).toBe(zh['menu.aria'])
+    expect(translate('path.more')).toBe(zh['path.more'])
     ctx.locale.setLocale('en')
-    expect(translate('menu.aria')).toBe(en['menu.aria'])
+    expect(translate('path.more')).toBe(en['path.more'])
     await fiber.dispose()
-    expect(translate('menu.aria')).not.toBe(en['menu.aria'])
+    expect(translate('path.more')).not.toBe(en['path.more'])
   })
 
   it('keeps the English dictionary key-identical to the Chinese source of truth', () => {
diff --git a/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx
new file mode 100644
index 0000000000..6404ec8b9e
--- /dev/null
+++ b/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx
@@ -0,0 +1,53 @@
+// @vitest-environment jsdom
+/** Authorized file routes use the same application menu and failure feedback as previews. */
+import { act, cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, expect, it, vi } from 'vitest'
+import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
+import { FileRouteAction } from '../src/client/FileRouteAction.tsx'
+import { en } from '../src/client/locales.ts'
+
+afterEach(() => { cleanup(); vi.unstubAllGlobals() })
+const apps = [{ id: 'music', name: 'Music', default: true, icon: null }]
+const props = () => ({ actionUrl: 'api/present.open?sessionId=s&seq=2&index=0', available: true, pending: false,
+  onAction: vi.fn(async () => null), t: makeTranslate(en) })
+
+it('queries the authorized route, selects a handler, and keeps reveal last', async () => {
+  const fetcher = vi.fn(async () => Response.json(apps))
+  vi.stubGlobal('fetch', fetcher)
+  const p = props()
+  render(<FileRouteAction {...p} />)
+  await act(async () => {})
+  expect(fetcher).toHaveBeenCalledWith(p.actionUrl, { signal: expect.any(AbortSignal) })
+  fireEvent.mouseEnter(screen.getByRole('button', { name: 'Open in Music' }))
+  expect(await screen.findByRole('tooltip')).toHaveProperty('textContent', 'Open in Music')
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: en['path.more'] })) })
+  expect(screen.getAllByRole('menuitem').map(item => item.textContent)).toEqual(['Music (default)', 'Show file location'])
+  await act(async () => { fireEvent.click(screen.getByRole('menuitem', { name: 'Music (default)' })) })
+  expect(p.onAction).toHaveBeenLastCalledWith('open', 'music')
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: 'Open in Music' })) })
+  expect(p.onAction).toHaveBeenLastCalledWith('open', undefined)
+})
+
+it.each(['http', 'transport', 'invalid'] as const)('keeps reveal available after a %s query failure', async (failure) => {
+  vi.stubGlobal('fetch', vi.fn(async () => {
+    if (failure === 'transport') throw new Error('offline')
+    return failure === 'http' ? new Response(null, { status: 404 }) : Response.json({ invalid: true })
+  }))
+  const p = props()
+  render(<FileRouteAction {...p} />)
+  await act(async () => {})
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: en['path.reveal'] })) })
+  expect(p.onAction).toHaveBeenCalledWith('reveal', undefined)
+})
+
+it('does not query without a desktop and honors another pending gesture', async () => {
+  const fetcher = vi.fn(async () => Response.json(apps))
+  vi.stubGlobal('fetch', fetcher)
+  const p = props()
+  const view = render(<FileRouteAction {...p} available={false} />)
+  expect(view.container.innerHTML).toBe('')
+  expect(fetcher).not.toHaveBeenCalled()
+  view.rerender(<FileRouteAction {...p} pending />)
+  await act(async () => {})
+  expect(screen.getByRole('button', { name: 'Open in Music' })).toHaveProperty('disabled', true)
+})
diff --git a/packages/client/ui-open-in-app/tsconfig.json b/packages/client/ui-open-in-app/tsconfig.json
index 1f0c094732..e37925c8a4 100644
--- a/packages/client/ui-open-in-app/tsconfig.json
+++ b/packages/client/ui-open-in-app/tsconfig.json
@@ -46,6 +46,12 @@
     },
     {
       "path": "../ui-slots"
+    },
+    {
+      "path": "../ui-deliverables/tsconfig.client.json"
+    },
+    {
+      "path": "../../util/native-command"
     }
   ]
 }
diff --git a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
index 9d8b9b731d..08f13fbf40 100644
--- a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
+++ b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
@@ -1564,6 +1564,65 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'conversation.view\', () => ctx.slots.register(\n      { name: \'conversation.view\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
     source: 'packages/client/ui-conversation/src/client/contract/slots.ts:181',
   },
+  {
+    key: 'deliverables.file.actions',
+    kind: 'list',
+    scope: 'session',
+    summary: 'Open one file through its authorized Session event coordinates.',
+    doc: 'Open one file through its authorized Session event coordinates.',
+    registerOptions: [
+      {
+        name: 'id',
+        requirement: 'required',
+        type: 'string',
+        doc: 'Your cell key. Use an id of your own: a fresh id is added beside the shipped entries, while reusing a shipped id puts you in THAT cell and replaces it. Owners that filter by id address you by it.',
+      },
+      {
+        name: 'order',
+        requirement: 'optional',
+        type: 'number',
+        doc: 'Position among the entries, ascending (default 0).',
+      },
+      {
+        name: 'label',
+        requirement: 'optional',
+        type: 'string | (() => string)',
+        doc: 'Display text where the owner projects one (nav rows, tabs). A thunk is re-read on every projection, so localized text follows the active locale without re-registering.',
+      },
+    ],
+    ownerProps: [
+      '/** Native file action selected by an explicit user gesture. */\nexport type PresentedAction = \'open\' | \'reveal\'',
+      '/** Failure feedback for the shared native opening control. */\nexport type PresentedOpenFailure = \'openError\' | \'revealError\' | null',
+    ],
+    ownerPropsReferences: [],
+    standardProps: [
+      'useResource: UseResource',
+      'useWorkspaces: SnapshotSelectorHook<WorkspaceSnapshot>',
+      'usePanelInfo: UsePanelInfo',
+      'useSessions: UseSessions',
+      'useSessionStatus: UseSessionStatus',
+      'useSessionRetainInfo: UseSessionRetainInfo',
+      'useWorkspaces: SnapshotSelectorHook<WorkspaceSnapshot>',
+      'useChat: UseChat',
+      'useConversation: UseConversation',
+      'useInput: SnapshotSelectorHook<InputState>',
+      'inputActions: InputActions',
+      'useSession: SessionSnapshotSelector',
+      'sessionId: SessionId',
+      'useProjection: UseProjection',
+      'useTrajectory: UseTrajectory',
+    ],
+    keyDomain: '',
+    hookContext: '',
+    slotInject: '',
+    declaredBy: 'an entry in \'conversation.chat.turnTail\' (client-ui-deliverables), so it exists while that entry is mounted',
+    occupants: [
+      'client-ui-open-in-app FileRouteAction id \'open-in-app\'',
+    ],
+    replaceRisk: 'none',
+    example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'deliverables.file.actions\', () => ctx.slots.register(\n      { name: \'deliverables.file.actions\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
+    source: 'packages/client/ui-deliverables/src/client/file-actions.ts:8',
+  },
   {
     key: 'main',
     kind: 'keyed',
diff --git a/packages/util/native-command/src/file-applications.ts b/packages/util/native-command/src/file-applications.ts
index 9b834ad8dd..7a9b7f9ea8 100644
--- a/packages/util/native-command/src/file-applications.ts
+++ b/packages/util/native-command/src/file-applications.ts
@@ -4,7 +4,7 @@ import { linuxFileApplications } from './file-applications-linux.ts'
 import { windowsFileApplications } from './file-applications-windows.ts'
 import { nativeFileManager } from './path-opener.ts'
 import type { PathOpenerInternals } from './path-opener.ts'
-import type { NativeFileApplication } from './types.ts'
+import { parseNativeFileApplications, type NativeFileApplication } from './types.ts'
 
 /** AppKit runs inside the system JXA host; paths arrive as argv, never executable source. */
 const MAC_APPLICATIONS = `
@@ -67,21 +67,7 @@ async function queryFileApplications(
   } else if (target.platform === 'win32') {
     stdout = await windowsFileApplications(target.path, null, signal, run)
   } else return []
-  const value: unknown = JSON.parse(stdout)
-  if (!Array.isArray(value)) throw new Error('Invalid native application list')
-  const applications: NativeFileApplication[] = []
-  const entries: readonly unknown[] = value
-  for (const entry of entries) {
-    if (typeof entry !== 'object' || entry === null
-      || !('id' in entry) || !('name' in entry) || !('default' in entry) || !('icon' in entry)
-      || typeof entry.id !== 'string' || entry.id.length === 0
-      || typeof entry.name !== 'string' || typeof entry.default !== 'boolean'
-      || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/(?:png|svg\+xml);base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
-      throw new Error('Invalid native application entry')
-    }
-    applications.push({ id: entry.id, name: entry.name, default: entry.default, icon: entry.icon })
-  }
-  return applications
+  return parseNativeFileApplications(JSON.parse(stdout))
 }
 
 /**
diff --git a/packages/util/native-command/src/types.ts b/packages/util/native-command/src/types.ts
index 1e93b93bc5..5af42bb996 100644
--- a/packages/util/native-command/src/types.ts
+++ b/packages/util/native-command/src/types.ts
@@ -9,3 +9,26 @@ export interface NativeFileApplication {
   /** PNG or SVG data URL, or null when the desktop supplies no icon. */
   readonly icon: string | null
 }
+
+/**
+ * Validate file association metadata received from a native process or authenticated Host.
+ * @param value - decoded application list.
+ * @returns validated application metadata.
+ * @throws Error for malformed entries or unsupported icon URLs.
+ */
+export function parseNativeFileApplications(value: unknown): readonly NativeFileApplication[] {
+  if (!Array.isArray(value)) throw new Error('Invalid native application list')
+  const applications: NativeFileApplication[] = []
+  const entries: readonly unknown[] = value
+  for (const entry of entries) {
+    if (typeof entry !== 'object' || entry === null
+      || !('id' in entry) || !('name' in entry) || !('default' in entry) || !('icon' in entry)
+      || typeof entry.id !== 'string' || entry.id.length === 0
+      || typeof entry.name !== 'string' || typeof entry.default !== 'boolean'
+      || !(entry.icon === null || (typeof entry.icon === 'string' && /^data:image\/(?:png|svg\+xml);base64,[A-Za-z0-9+/=]+$/.test(entry.icon)))) {
+      throw new Error('Invalid native application entry')
+    }
+    applications.push({ id: entry.id, name: entry.name, default: entry.default, icon: entry.icon })
+  }
+  return applications
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index dc16be7fbf..f4f06bf314 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3575,6 +3575,9 @@ importers:
       '@deepseek-ai/dsh-client-ui-conversation':
         specifier: workspace:^
         version: link:../ui-conversation
+      '@deepseek-ai/dsh-client-ui-deliverables':
+        specifier: workspace:^
+        version: link:../ui-deliverables
       '@deepseek-ai/dsh-client-ui-primitives':
         specifier: workspace:^
         version: link:../ui-primitives
@@ -3593,6 +3596,9 @@ importers:
       '@deepseek-ai/dsh-host-open-in-app':
         specifier: workspace:^
         version: link:../../host/open-in-app
+      '@deepseek-ai/dsh-native-command':
+        specifier: workspace:^
+        version: link:../../util/native-command
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
diff --git a/scripts/no-unknown-casts.baseline.json b/scripts/no-unknown-casts.baseline.json
index 154c57b993..9bf0476844 100644
--- a/scripts/no-unknown-casts.baseline.json
+++ b/scripts/no-unknown-casts.baseline.json
@@ -594,10 +594,6 @@
   "packages/client/ui-deliverables/tests/present-open.host.spec.ts": {
     "556e0d31b686cc80ef5c9562dad5534556f1b55ce1ce20491aa39eda98255364": 1
   },
-  "packages/client/ui-deliverables/tests/review-tab.client.spec.tsx": {
-    "52e0f8e51efd9a65974af6ad6868c7e01fff0d6faeb669e9da1bf91de8a2d422": 1,
-    "56f9870142343b23a01725140b72d040d1b9071dd30227271518f50cfa614b6c": 1
-  },
   "packages/client/ui-goal/tests/browser-plugin.client.spec.tsx": {
     "04984a2ce1486250236e638e0197da0a1a840855ed3975c59130a85358c7e5fe": 1,
     "5f1a0867b42cf35dac7fdf5839e3a39c2384c5b3b03142e799a36733ad96b9da": 1,

From b80722812b1ff35ce1d44d73d4853987cc76936b Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:55:27 +0800
Subject: [PATCH 32/62] fix: scope shared file actions to their owning views

---
 apps/web/tests/present-svg.e2e.ts             |  2 +-
 apps/web/tests/present.e2e.ts                 | 28 +++++++++++--------
 .../ui-deliverables/src/client/ReviewTab.tsx  |  4 +--
 .../src/client/file-actions.ts                |  2 ++
 .../ui-deliverables/src/client/index.ts       |  2 +-
 .../ui-deliverables/tests/file-actions.tsx    |  2 +-
 .../tests/present-open.host.spec.ts           |  2 +-
 .../tests/turn-tail-spacing.client.spec.ts    |  1 -
 .../client/ui-open-in-app/src/client/index.ts |  3 ++
 9 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/apps/web/tests/present-svg.e2e.ts b/apps/web/tests/present-svg.e2e.ts
index 7c856df6f9..461b71e0e3 100644
--- a/apps/web/tests/present-svg.e2e.ts
+++ b/apps/web/tests/present-svg.e2e.ts
@@ -128,7 +128,7 @@ describe('web e2e: requested SVG is explicitly delivered', () => {
 
   it.skipIf(MODE === 'record')('replays the delivered file and Chinese conversation', async () => {
     await assertFinalWorkspaceSnapshot(DIR, cwd)
-    await expect.poll(() => page.getByRole('button', { name: `${FILE} 的更多文件操作`, exact: true }).isDisabled()).toBe(true)
+    expect(await page.locator('[data-presented-file] [data-open-target]').count()).toBe(0)
     // Delivery owns the transcript; navigation and composer chrome have separate scenarios.
     const aria = await captureExpandedTurnProcessAria(page, '[data-chat-flow]', scaffold.workspaceCwd)
     await compareOrRefreshGolden(join(DIR, 'ui.expected.md'), aria, MODE)
diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index 1c4c5fe44f..0fa592a09a 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -57,6 +57,13 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       agentPresets: { roots: [], default: 'ptc' }, compareReplaySession: true,
       ...(MODE === 'record' ? {} : { replayFixture: FIXTURE }),
     })
+    // File associations belong to the desktop rather than the recorded Session.
+    const controller = scaffold.ctx.get('sessionController')
+    if (controller === undefined) throw new Error('present requires Session Controller')
+    const nativeQuery: unknown = Reflect.get(controller, 'fileApplications')
+    if (typeof nativeQuery !== 'function') throw new Error('present requires native association discovery')
+    Reflect.set(controller, 'fileApplications', async () => [{ id: 'test-editor', name: 'Test Editor', default: true, icon: null }])
+    scaffold.ctx.effect(() => () => { Reflect.set(controller, 'fileApplications', nativeQuery) }, 'present: native association fixture')
     disposeApproval = scaffold.ctx.on('approval/request', () => Promise.resolve('allowed-once'), { prepend: true })
     scaffold.ctx.on('session/event', (_session, event) => { events.push(event) })
     browser = await chromium.launch()
@@ -121,7 +128,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       }
       const row = page.locator('[data-presented-files-row]')
       await row.waitFor()
-      expect(await row.getByRole('button', { name: /More file actions/ }).count()).toBe(2)
+      expect(await row.getByRole('button', { name: 'More ways to open' }).count()).toBe(2)
       expect(await row.getByText('report.txt', { exact: true }).innerText()).toBe('report.txt')
       const beforePreview = (await opened()).length
       const column = page.locator('[data-rightbar-col]')
@@ -139,19 +146,16 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       expect(downloads).toEqual([])
       await page.getByRole('button', { name: 'Collapse right sidebar', exact: true }).click()
       const beforeReveal = (await opened()).length
-      await row.getByRole('button', { name: 'More file actions for report.txt', exact: true }).click()
+      await row.locator('[data-presented-file]').filter({ hasText: 'report.txt' }).getByRole('button', { name: 'More ways to open', exact: true }).click()
       const revealResponse = page.waitForResponse(response => response.url().includes('action=reveal') && response.request().method() === 'POST')
-      await page.getByRole('menuitem', { name: process.platform === 'darwin' ? /Show in Finder/ : /Open containing folder/ }).click()
+      await page.getByRole('menuitem', { name: 'Show file location', exact: true }).click()
       expect((await revealResponse).status()).toBe(204)
-      expect(await row.getByRole('button', { name: 'Open report.txt in sidebar', exact: true })
-        .evaluate(button => button === document.activeElement)).toBe(true)
       await expect.poll(opened).toHaveLength(beforeReveal + 1)
       expect((await opened()).at(-1)).toEqual({ action: 'reveal', content: null, path: await realpath(process.platform === 'darwin' ? join(cwd, 'report.txt') : cwd) })
       for (const [name, bytes] of [['report.txt', 'EDITED_REPORT\n'], ['说明.txt', 'EDITED_NOTE\n']] as const) {
         const count = (await opened()).length
         const response = page.waitForResponse(response => response.url().includes('/api/present.open?') && response.request().method() === 'POST')
-        await row.getByRole('button', { name: `More file actions for ${name}`, exact: true }).click()
-        await page.getByRole('menuitem', { name: 'Open in default app', exact: true }).click()
+        await row.locator('[data-presented-file]').filter({ hasText: name }).getByRole('button', { name: 'Open in Test Editor', exact: true }).click()
         expect((await response).status()).toBe(204)
         await page.waitForFunction(() => document.querySelector('[data-presented-files-row] button:disabled') === null)
         expect(await opened()).toHaveLength(count + 1)
@@ -217,7 +221,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
         )
         const description = requiredElement(report.querySelector<HTMLElement>('span[role="status"]'), 'report status')
         const open = requiredElement(
-          report.querySelector<HTMLButtonElement>('button[aria-label="Open report.txt in sidebar"]'),
+          report.querySelector<HTMLButtonElement>('[data-open-target] button'),
           'report open action',
         )
         const icon = requiredElement(report.querySelector<SVGElement>('svg'), 'report icon')
@@ -250,7 +254,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       expect(geometry.iconWidth).toBe('20')
       expect(geometry.titleFontSize).toBe('13px')
       expect(geometry.descriptionFontSize).toBe('10px')
-      expect(geometry.openFontSize).toBe('12px')
+      expect(geometry.openFontSize).toBe('11px')
       await page.setViewportSize({ width: 480, height: 900 })
       const row = page.locator('[data-presented-files-row]')
       await row.scrollIntoViewIfNeeded()
@@ -263,9 +267,9 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
     }
     const beforeDelete = (await opened()).length
     await unlink(join(cwd, 'report.txt'))
-    const missing = page.waitForResponse(response => response.url().includes('/api/present.open?'))
-    await page.locator('[data-presented-files-row]').getByRole('button', { name: 'More file actions for report.txt', exact: true }).click()
-    await page.getByRole('menuitem', { name: 'Open in default app', exact: true }).click()
+    const missing = page.waitForResponse(response => response.url().includes('/api/present.open?') && response.request().method() === 'POST')
+    await page.locator('[data-presented-file]').filter({ hasText: 'report.txt' })
+      .getByRole('button', { name: 'Open in Test Editor', exact: true }).click()
     expect((await missing).status()).toBe(404)
     await page.getByText('Could not open. Click to retry.', { exact: true }).waitFor()
     expect(await opened()).toHaveLength(beforeDelete)
diff --git a/packages/client/ui-deliverables/src/client/ReviewTab.tsx b/packages/client/ui-deliverables/src/client/ReviewTab.tsx
index c51efeeaef..362f88ec9d 100644
--- a/packages/client/ui-deliverables/src/client/ReviewTab.tsx
+++ b/packages/client/ui-deliverables/src/client/ReviewTab.tsx
@@ -45,7 +45,7 @@ export interface ReviewInjected {
 
 /** The body's composed props: the tab it draws, its store, its injected face, and its copy. */
 export type ReviewTabProps = PropsRuntime<'sidebar.right.pane.tab'> & PropsStore<ReturnType<typeof createReviewStore>>
-  & InjectFace<ReviewInjected> & PropsLocale<typeof NS> & PropsRenderSlots<'deliverables.file.actions'>
+  & InjectFace<ReviewInjected> & PropsLocale<typeof NS> & PropsRenderSlots<'deliverables.review.file.actions'>
 
 /** One drawn line of a hunk with its line numbers on each side. */
 export interface DiffRow {
@@ -266,7 +266,7 @@ export function ReviewTab({
             <button type="button" className={css.tool} aria-label={t('review.openFileAria', { name: file.display })} data-review-tool="open-file"
               onClick={() => { tab.actions.openResource(fileAddressFor(sessionId, cwd, file.path)) }}><IconInspectOutlineRegular /></button>
           </Tooltip>}
-          {file !== undefined && renderSlot('deliverables.file.actions', {
+          {file !== undefined && renderSlot('deliverables.review.file.actions', {
             actionUrl: changedFileUrl(sessionId, seq, index), available: native,
             pending: phase === 'opening' || phase === 'revealing',
             onAction: (action, application) => openChanged(sessionId, seq, index, action, application),
diff --git a/packages/client/ui-deliverables/src/client/file-actions.ts b/packages/client/ui-deliverables/src/client/file-actions.ts
index b39ab16a41..e4f9dedde8 100644
--- a/packages/client/ui-deliverables/src/client/file-actions.ts
+++ b/packages/client/ui-deliverables/src/client/file-actions.ts
@@ -17,5 +17,7 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
         readonly onAction: (action: PresentedAction, application?: string) => Promise<PresentedOpenFailure>
       }
     }
+    /** The same file actions owned by a changed-file review tab. */
+    'deliverables.review.file.actions': SlotMap['deliverables.file.actions']
   }
 }
diff --git a/packages/client/ui-deliverables/src/client/index.ts b/packages/client/ui-deliverables/src/client/index.ts
index da1e38c5e6..f000547756 100644
--- a/packages/client/ui-deliverables/src/client/index.ts
+++ b/packages/client/ui-deliverables/src/client/index.ts
@@ -86,7 +86,7 @@ export function apply(ctx: ClientContext): void {
   ctx.effect(() => ctx.slots.inject('sidebar.right.pane.tab', () => ctx.slots.register(
     {
       name: 'sidebar.right.pane.tab', key: CHANGES_REVIEW_ID, locale: NS, store: createReviewStore(),
-      children: { 'deliverables.file.actions': { kind: 'list', scope: 'session' } },
+      children: { 'deliverables.review.file.actions': { kind: 'list', scope: 'session' } },
       inject: (): ReviewInjected => ({
         hooks: { changesSummary: summaries.state, changesDiff: diffs.state, presentedOpen: opener.state, presentedHost: opener.host },
         loadChangesSummary: (sessionId, seq) => summaries.load(sessionId, seq),
diff --git a/packages/client/ui-deliverables/tests/file-actions.tsx b/packages/client/ui-deliverables/tests/file-actions.tsx
index 964b7b88b1..7d857bf6fc 100644
--- a/packages/client/ui-deliverables/tests/file-actions.tsx
+++ b/packages/client/ui-deliverables/tests/file-actions.tsx
@@ -3,6 +3,6 @@ import type { PropsRenderSlots } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '../src/client/index.ts'
 
 /** Slot renderer exposing the owning route and gesture for component tests. */
-export const renderFileActions: PropsRenderSlots<'deliverables.file.actions'>['renderSlot'] = (_name, props) =>
+export const renderFileActions: PropsRenderSlots<'deliverables.file.actions' | 'deliverables.review.file.actions'>['renderSlot'] = (_name, props) =>
   props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
     onClick={() => { void props.onAction('open') }}>Native file action</button> : null
diff --git a/packages/client/ui-deliverables/tests/present-open.host.spec.ts b/packages/client/ui-deliverables/tests/present-open.host.spec.ts
index b4e80a0b0e..b313ee0aa8 100644
--- a/packages/client/ui-deliverables/tests/present-open.host.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.host.spec.ts
@@ -63,7 +63,7 @@ describe('Presented workspace file native open route', () => {
     const { cwd, open, file, fiber, opener, handler, ctx } = await fixture()
     const source = await realpath(join(cwd, file.path))
     expect(presentedFileUrl(SessionId('owner'), 7, 0)).toBe('api/present.open?sessionId=owner&seq=7&index=0')
-    expect((await handler.fetch(new Request(`http://localhost${PRESENT_OPEN_PATH}`))).status).toBe(404)
+    expect((await handler.fetch(new Request(`http://localhost${PRESENT_OPEN_PATH}`))).status).toBe(400)
     expect((await handler.fetch(new Request('http://localhost/api/present.download?sessionId=owner&seq=7&index=0'))).status).toBe(404)
     for (const contents of ['current source', 'edited source']) {
       await writeFile(source, contents)
diff --git a/packages/client/ui-deliverables/tests/turn-tail-spacing.client.spec.ts b/packages/client/ui-deliverables/tests/turn-tail-spacing.client.spec.ts
index 6bd7af1bc5..9d9bb1cbc4 100644
--- a/packages/client/ui-deliverables/tests/turn-tail-spacing.client.spec.ts
+++ b/packages/client/ui-deliverables/tests/turn-tail-spacing.client.spec.ts
@@ -18,7 +18,6 @@ describe('deliverables layout', () => {
     expect(read('PresentedFileCard.tsx')).toMatch(/<FileTypeIcon path=\{file\.path\} size=\{20\} \/>/)
     expect(deliveries).toMatch(/\.fileName\s*\{[^}]*font-size:\s*13px;[^}]*line-height:\s*20px/s)
     expect(deliveries).toMatch(/\.description\s*\{[^}]*font-size:\s*10px;[^}]*line-height:\s*16px/s)
-    expect(deliveries).toMatch(/\.open\s*\{[^}]*padding:\s*4px 8px;[^}]*font-size:\s*12px;[^}]*line-height:\s*18px/s)
     expect(deliveries).toMatch(/\.presented\s*\{[^}]*gap:\s*10px/s)
   })
 
diff --git a/packages/client/ui-open-in-app/src/client/index.ts b/packages/client/ui-open-in-app/src/client/index.ts
index e80e58189a..c92aff20f5 100644
--- a/packages/client/ui-open-in-app/src/client/index.ts
+++ b/packages/client/ui-open-in-app/src/client/index.ts
@@ -87,4 +87,7 @@ export function apply(ctx: ClientContext): void {
   ctx.slots.inject('deliverables.file.actions', () => ctx.slots.register({
     name: 'deliverables.file.actions', id: 'open-in-app', locale: NS,
   }, FileRouteAction))
+  ctx.slots.inject('deliverables.review.file.actions', () => ctx.slots.register({
+    name: 'deliverables.review.file.actions', id: 'open-in-app', locale: NS,
+  }, FileRouteAction))
 }

From 59fdc2604d083008ad9935c9213b901865f0939f Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:56:09 +0800
Subject: [PATCH 33/62] test: provide the file action slot runtime in delivery
 fixtures

---
 .../ui-deliverables/tests/deliverables.client.spec.tsx |  1 +
 packages/client/ui-deliverables/tests/file-actions.tsx | 10 +++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx b/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
index 65ead43368..ebc34d72e7 100644
--- a/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
+++ b/packages/client/ui-deliverables/tests/deliverables.client.spec.tsx
@@ -42,6 +42,7 @@ function openProps(controller = new PresentedOpenController(), summaries = new C
   controller.host.set({ name: 'desktop', available: true, fileManager: 'finder' })
   const sessions: SessionListState = { ids: [], byId: {}, phase: 'ready', projectionsBySession: {}, jobsBySession: {} }
   return {
+    SessionProvider: ({ children }: { children?: import('react').ReactNode }) => <>{children}</>,
     renderSlot: renderFileActions,
     useShowCodeDiff: <T,>(select: (value: boolean) => T): T => select(true),
     useSessions: <T,>(select: (state: SessionListState) => T): T => select(sessions),
diff --git a/packages/client/ui-deliverables/tests/file-actions.tsx b/packages/client/ui-deliverables/tests/file-actions.tsx
index 7d857bf6fc..55e29618d6 100644
--- a/packages/client/ui-deliverables/tests/file-actions.tsx
+++ b/packages/client/ui-deliverables/tests/file-actions.tsx
@@ -1,8 +1,12 @@
 /** Capture delivery action ownership without duplicating the opening-control implementation. */
-import type { PropsRenderSlots } from '@deepseek-ai/dsh-client-ui-slots'
+import type { SlotMap } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '../src/client/index.ts'
 
 /** Slot renderer exposing the owning route and gesture for component tests. */
-export const renderFileActions: PropsRenderSlots<'deliverables.file.actions' | 'deliverables.review.file.actions'>['renderSlot'] = (_name, props) =>
-  props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
+export function renderFileActions(
+  _name: 'deliverables.file.actions' | 'deliverables.review.file.actions',
+  props: SlotMap['deliverables.file.actions']['owner'],
+) {
+  return props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
     onClick={() => { void props.onAction('open') }}>Native file action</button> : null
+}

From 28089001a27d912c428287be7369a933344eaca0 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 13:59:00 +0800
Subject: [PATCH 34/62] fix: complete file action slot contracts and branch
 coverage

---
 .../src/client/file-actions.ts                |  6 +-
 .../tests/changes-open.host.spec.ts           |  7 +++
 .../ui-deliverables/tests/file-actions.tsx    |  8 +--
 .../tests/present-open.client.spec.ts         | 10 ++++
 .../src/client/file-applications.ts           |  2 +-
 .../tests/browser-plugin.client.spec.ts       |  1 +
 .../src/client/slot-catalog.ts                | 60 +++++++++++++++++++
 7 files changed, 87 insertions(+), 7 deletions(-)

diff --git a/packages/client/ui-deliverables/src/client/file-actions.ts b/packages/client/ui-deliverables/src/client/file-actions.ts
index e4f9dedde8..1326f80b76 100644
--- a/packages/client/ui-deliverables/src/client/file-actions.ts
+++ b/packages/client/ui-deliverables/src/client/file-actions.ts
@@ -18,6 +18,10 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
       }
     }
     /** The same file actions owned by a changed-file review tab. */
-    'deliverables.review.file.actions': SlotMap['deliverables.file.actions']
+    'deliverables.review.file.actions': {
+      kind: 'list'
+      scope: 'session'
+      owner: SlotMap['deliverables.file.actions']['owner']
+    }
   }
 }
diff --git a/packages/client/ui-deliverables/tests/changes-open.host.spec.ts b/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
index 443287ed97..6fda6fed4a 100644
--- a/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
+++ b/packages/client/ui-deliverables/tests/changes-open.host.spec.ts
@@ -216,3 +216,10 @@ it('queries handlers only after file authorization and forwards explicit applica
   expect((await handler.fetch(new Request(url))).status).toBe(422)
   expect(applications).toHaveBeenCalledOnce()
 })
+
+
+it('rejects an unsupported changed-file action before invoking the desktop', async () => {
+  const { open, opener } = await fixture()
+  expect((await open('?sessionId=owner&seq=9&index=0&action=remove')).status).toBe(400)
+  expect(opener).not.toHaveBeenCalled()
+})
diff --git a/packages/client/ui-deliverables/tests/file-actions.tsx b/packages/client/ui-deliverables/tests/file-actions.tsx
index 55e29618d6..5efa0ec4db 100644
--- a/packages/client/ui-deliverables/tests/file-actions.tsx
+++ b/packages/client/ui-deliverables/tests/file-actions.tsx
@@ -1,12 +1,10 @@
 /** Capture delivery action ownership without duplicating the opening-control implementation. */
-import type { SlotMap } from '@deepseek-ai/dsh-client-ui-slots'
+import type { PropsRenderSlots, SlotMap } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '../src/client/index.ts'
 
 /** Slot renderer exposing the owning route and gesture for component tests. */
-export function renderFileActions(
-  _name: 'deliverables.file.actions' | 'deliverables.review.file.actions',
-  props: SlotMap['deliverables.file.actions']['owner'],
-) {
+export const renderFileActions: PropsRenderSlots<'deliverables.file.actions' | 'deliverables.review.file.actions'>['renderSlot'] = (_name, input) => {
+  const props = input as SlotMap['deliverables.file.actions']['owner']
   return props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
     onClick={() => { void props.onAction('open') }}>Native file action</button> : null
 }
diff --git a/packages/client/ui-deliverables/tests/present-open.client.spec.ts b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
index 35fd278616..6d6d4c4760 100644
--- a/packages/client/ui-deliverables/tests/present-open.client.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
@@ -174,3 +174,13 @@ it.each(['open', 'reveal'] as const)('reports an unavailable Host path for %s wh
   expect(controller.state.getSnapshot()[url]).toBe('nativeUnavailable')
   await controller.dispose()
 })
+
+
+it('encodes an explicit application identifier without changing the file coordinates', async () => {
+  const fetcher = vi.fn(async () => new Response(null, { status: 204 }))
+  vi.stubGlobal('fetch', fetcher)
+  const controller = new PresentedOpenController()
+  expect(await controller.open(id, 2, 1, 'open', '/Apps/A&B.app')).toBeNull()
+  expect(fetcher).toHaveBeenCalledWith(`${url}&application=%2FApps%2FA%26B.app`, { method: 'POST', signal: expect.any(AbortSignal) })
+  await controller.dispose()
+})
diff --git a/packages/client/ui-open-in-app/src/client/file-applications.ts b/packages/client/ui-open-in-app/src/client/file-applications.ts
index 00bb9331f2..b4f27e3340 100644
--- a/packages/client/ui-open-in-app/src/client/file-applications.ts
+++ b/packages/client/ui-open-in-app/src/client/file-applications.ts
@@ -13,7 +13,7 @@ export function useFileApplications(
   target: string,
   query: (target: string, signal: AbortSignal) => Promise<readonly SessionWorkspacePathApplication[] | null>,
   enabled: boolean,
-) {
+): { apps: readonly SessionWorkspacePathApplication[]; loading: boolean; failed: boolean; refresh: () => void } {
   const [revision, setRevision] = useState(0)
   const [association, setAssociation] = useState<{
     target: string
diff --git a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
index e538dc4fd2..43ccf7df46 100644
--- a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
@@ -41,6 +41,7 @@ async function bench(): Promise<{ ctx: Context; fiber: ReturnType<Context['plugi
       'sidebar.right.tab.document.actions': { kind: 'list', scope: 'session' },
       'sidebar.right.tab.document.unpreviewable': { kind: 'list', scope: 'session' },
       'deliverables.file.actions': { kind: 'list', scope: 'session' },
+      'deliverables.review.file.actions': { kind: 'list', scope: 'session' },
     },
   } as never, () => null)
   ctx.provide('sessions', {})
diff --git a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
index 08f13fbf40..7d50d6f71a 100644
--- a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
+++ b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
@@ -1623,6 +1623,66 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'deliverables.file.actions\', () => ctx.slots.register(\n      { name: \'deliverables.file.actions\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
     source: 'packages/client/ui-deliverables/src/client/file-actions.ts:8',
   },
+  {
+    key: 'deliverables.review.file.actions',
+    kind: 'list',
+    scope: 'session',
+    summary: 'The same file actions owned by a changed-file review tab.',
+    doc: 'The same file actions owned by a changed-file review tab.',
+    registerOptions: [
+      {
+        name: 'id',
+        requirement: 'required',
+        type: 'string',
+        doc: 'Your cell key. Use an id of your own: a fresh id is added beside the shipped entries, while reusing a shipped id puts you in THAT cell and replaces it. Owners that filter by id address you by it.',
+      },
+      {
+        name: 'order',
+        requirement: 'optional',
+        type: 'number',
+        doc: 'Position among the entries, ascending (default 0).',
+      },
+      {
+        name: 'label',
+        requirement: 'optional',
+        type: 'string | (() => string)',
+        doc: 'Display text where the owner projects one (nav rows, tabs). A thunk is re-read on every projection, so localized text follows the active locale without re-registering.',
+      },
+    ],
+    ownerProps: [
+      '/** Slot contract table. Owners extend via declaration merging; entries are {@link SlotEntryDef}. */\nexport interface SlotMap {}',
+    ],
+    ownerPropsReferences: [
+      'SlotEntryDef',
+    ],
+    standardProps: [
+      'useResource: UseResource',
+      'useWorkspaces: SnapshotSelectorHook<WorkspaceSnapshot>',
+      'usePanelInfo: UsePanelInfo',
+      'useSessions: UseSessions',
+      'useSessionStatus: UseSessionStatus',
+      'useSessionRetainInfo: UseSessionRetainInfo',
+      'useWorkspaces: SnapshotSelectorHook<WorkspaceSnapshot>',
+      'useChat: UseChat',
+      'useConversation: UseConversation',
+      'useInput: SnapshotSelectorHook<InputState>',
+      'inputActions: InputActions',
+      'useSession: SessionSnapshotSelector',
+      'sessionId: SessionId',
+      'useProjection: UseProjection',
+      'useTrajectory: UseTrajectory',
+    ],
+    keyDomain: '',
+    hookContext: '',
+    slotInject: '',
+    declaredBy: 'an entry in \'sidebar.right.pane.tab\' (client-ui-deliverables), so it exists while that entry is mounted',
+    occupants: [
+      'client-ui-open-in-app FileRouteAction id \'open-in-app\'',
+    ],
+    replaceRisk: 'none',
+    example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'deliverables.review.file.actions\', () => ctx.slots.register(\n      { name: \'deliverables.review.file.actions\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
+    source: 'packages/client/ui-deliverables/src/client/file-actions.ts:21',
+  },
   {
     key: 'main',
     kind: 'keyed',

From 1f7e4915262008b3bc5fcd2970403157c9343975 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:00:41 +0800
Subject: [PATCH 35/62] docs: describe shared delivery and review file actions

---
 packages/client/ui-deliverables/README.i18n.yaml       | 4 ++--
 packages/client/ui-deliverables/README.md              | 2 +-
 packages/client/ui-deliverables/README.zh.md           | 2 +-
 packages/client/ui-deliverables/tests/file-actions.tsx | 2 +-
 packages/client/ui-open-in-app/README.i18n.yaml        | 4 ++--
 packages/client/ui-open-in-app/README.md               | 4 ++--
 packages/client/ui-open-in-app/README.zh.md            | 4 ++--
 7 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/packages/client/ui-deliverables/README.i18n.yaml b/packages/client/ui-deliverables/README.i18n.yaml
index 8f8941ac01..85892e110d 100644
--- a/packages/client/ui-deliverables/README.i18n.yaml
+++ b/packages/client/ui-deliverables/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-deliverables/README.md
-README.md: 9073659f5b6aeb11112aaa1c4e7834bf055944e7
-README.zh.md: 7a622b6f0bcf4bc75027542cc90fe6c2e2b86471
+README.md: a8e80ede3380cef7e0550a0a63aa195642ed4e12
+README.zh.md: 929ab7f93f6ff995586bd850b655eb2e7a31ac93
diff --git a/packages/client/ui-deliverables/README.md b/packages/client/ui-deliverables/README.md
index 9073659f5b..a8e80ede33 100644
--- a/packages/client/ui-deliverables/README.md
+++ b/packages/client/ui-deliverables/README.md
@@ -32,7 +32,7 @@ Mount this plugin alongside `ui-conversation` and the Host [workspace-changes](.
 
 The Web `standard`, `ptc`, and `cordis` presets expose `present` for final files accessible through the Session filesystem, including files created through Bash. Call it with `files: [{ path, description? }]` after creating the files. The [present tool](../../deliverables/tool-present/README.md) owns file-count limits and Session declarations. A single delivery fills the row; multiple deliveries form a two-column grid, collapsed after four files. Cards show the basename, description or file type, and a shared native opening control. Clicking the card previews the file in the right Sidebar. The control opens the default application and lists associated applications, with file reveal last. Matching inline-code references also open Sidebar previews. Duplicate declarations use the last description before the closing reply.
 
-The `present` tool row retains its document icon and recorded result across progress, success, failure, and interruption. Native actions share pending state and publish progress or retryable errors on the card. Desktop metadata is loaded when cards mount and invalidated on connection replacement. Without a Host desktop, cards retain Sidebar preview but omit native controls; failed metadata reads offer Retry. Delivery cards and change review expose `deliverables.file.actions`, supplied by [ui-open-in-app](../ui-open-in-app/README.md). Association GET requests and native POST actions both validate the recorded file coordinates and Session filesystem mapping before using the Host desktop.
+The `present` tool row retains its document icon and recorded result across progress, success, failure, and interruption. Native actions share pending state and publish progress or retryable errors on the card. Desktop metadata is loaded when cards mount and invalidated on connection replacement. Without a Host desktop, cards retain Sidebar preview but omit native controls; failed metadata reads offer Retry. Delivery cards and change review expose `deliverables.file.actions` and `deliverables.review.file.actions`, supplied by [ui-open-in-app](../ui-open-in-app/README.md). Association GET requests and native POST actions both validate the recorded file coordinates and Session filesystem mapping before using the Host desktop.
 
 ### The changed-files card
 
diff --git a/packages/client/ui-deliverables/README.zh.md b/packages/client/ui-deliverables/README.zh.md
index 7a622b6f0b..929ab7f93f 100644
--- a/packages/client/ui-deliverables/README.zh.md
+++ b/packages/client/ui-deliverables/README.zh.md
@@ -32,7 +32,7 @@ kind: "package-reference"
 
 Web 的 `standard`、`ptc` 与 `cordis` preset 提供 `present`，用于声明会话文件系统可访问的最终文件，包括通过 Bash 创建的文件。创建后以 `files: [{ path, description? }]` 调用。[present 工具](../../deliverables/tool-present/README.zh.md)拥有文件数量限制和会话声明。单个交付占满一行，多个交付使用双列网格，超过四个时默认收起。卡片显示文件名、说明或文件类型，以及共享的原生打开控件。点击卡片会在右侧 Sidebar 预览文件。控件打开默认应用，并列出关联应用，文件定位始终放在最后。匹配的行内代码引用也打开 Sidebar 预览。重复声明使用收尾回复之前最近一次的说明。
 
-`present` 工具行在执行、成功、失败和中断状态下保留文档图标及记录的结果。原生操作共享等待状态，并在卡片显示进度或可重试错误。卡片挂载时读取桌面信息，连接更换时清除缓存。Host 没有桌面时，卡片保留 Sidebar 预览并隐藏原生控件；元数据读取失败时提供重试。交付卡片和变更对比页通过 `deliverables.file.actions` 使用 [ui-open-in-app](../ui-open-in-app/README.zh.md) 提供的控件。关联应用 GET 查询与原生 POST 操作都会先校验记录中的文件坐标及会话文件系统映射，再调用 Host 桌面。
+`present` 工具行在执行、成功、失败和中断状态下保留文档图标及记录的结果。原生操作共享等待状态，并在卡片显示进度或可重试错误。卡片挂载时读取桌面信息，连接更换时清除缓存。Host 没有桌面时，卡片保留 Sidebar 预览并隐藏原生控件；元数据读取失败时提供重试。交付卡片和变更对比页通过 `deliverables.file.actions` 和 `deliverables.review.file.actions` 使用 [ui-open-in-app](../ui-open-in-app/README.zh.md) 提供的控件。关联应用 GET 查询与原生 POST 操作都会先校验记录中的文件坐标及会话文件系统映射，再调用 Host 桌面。
 
 ### 改动文件卡片
 
diff --git a/packages/client/ui-deliverables/tests/file-actions.tsx b/packages/client/ui-deliverables/tests/file-actions.tsx
index 5efa0ec4db..d1904bea6a 100644
--- a/packages/client/ui-deliverables/tests/file-actions.tsx
+++ b/packages/client/ui-deliverables/tests/file-actions.tsx
@@ -3,7 +3,7 @@ import type { PropsRenderSlots, SlotMap } from '@deepseek-ai/dsh-client-ui-slots
 import type {} from '../src/client/index.ts'
 
 /** Slot renderer exposing the owning route and gesture for component tests. */
-export const renderFileActions: PropsRenderSlots<'deliverables.file.actions' | 'deliverables.review.file.actions'>['renderSlot'] = (_name, input) => {
+export const renderFileActions: PropsRenderSlots<'deliverables.file.actions' | 'deliverables.review.file.actions'>['renderSlot'] = (_name: string, input: object) => {
   const props = input as SlotMap['deliverables.file.actions']['owner']
   return props.available ? <button type="button" data-action-url={props.actionUrl} disabled={props.pending}
     onClick={() => { void props.onAction('open') }}>Native file action</button> : null
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index 9f87aff18b..977cb96683 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: 010f86f19297db33511b40129d6caf36c71e49f9
-README.zh.md: ec0fe7741356c71b73f4d5de6f5dc0bb1b3be887
+README.md: 7840efdf1bb092cd538865f2b9b74b0911cfb06f
+README.zh.md: 0774e5228551b8463de129f49be2ac30f05f1273
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index 010f86f192..7840efdf1b 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -45,7 +45,7 @@ File associations refresh when the file changes or its menu opens; cancelled que
 
 The plugin registers the split button on `conversation.session.header.utilities` through the standard slot/inject currency and registers the `open-in-app` dictionaries as one effect. A page-lifetime controller ([`src/client/controller.ts`](src/client/controller.ts)) owns the once-per-page availability read, the persisted choice snapshot store, and the launch POST; the component receives both stores through the inject `hooks` compartment, so every Session header shares one truth. Document-relative route forms and wire payload types come from the host package's browser-safe `@deepseek-ai/dsh-host-open-in-app/shared` subpath. In-flight launches are guarded by a ref — repeat clicks and menu picks during a launch are ignored whole (a pick would otherwise persist a choice the gesture never opened) — and the busy/error dress is timer-driven around the `launch` promise.
 
-The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while `OpenPathInjected.applications` queries `session.workspacePathApplications` through [`open-path.ts`](src/client/open-path.ts). Opening uses `session.openWorkspacePath`; the Host revalidates an explicitly selected handler before launch. The directory adapter keeps the existing catalog routes. `FileRouteAction` supplies the same control to delivery cards and change review through `deliverables.file.actions`; their authenticated routes retain Session file authorization. A failed or unavailable file query therefore needs no platform-specific UI implementation.
+The directory and file adapters supply application metadata and operations to [`OpenTargetButton`](src/client/OpenTargetButton.tsx), which owns menu ordering, default markers, icons, sizing, and gesture feedback. The file header and empty state share `FileOpenTarget`, while `OpenPathInjected.applications` queries `session.workspacePathApplications` through [`open-path.ts`](src/client/open-path.ts). Opening uses `session.openWorkspacePath`; the Host revalidates an explicitly selected handler before launch. The directory adapter keeps the existing catalog routes. `FileRouteAction` supplies the same control to delivery cards and change review through `deliverables.file.actions` and `deliverables.review.file.actions`; their authenticated routes retain Session file authorization. A failed or unavailable file query therefore needs no platform-specific UI implementation.
 
 </details>
 
@@ -92,4 +92,4 @@ The feature-level decisions, including the split into the host package and this
 
 </details>
 
-**Runtime invariant:** No companion is published. The plugin registers one dictionary effect and three slot entries whose disposal the HMR-safety spec proves; application availability, the choice, and the desktop answer live in the controllers' snapshot stores with no second copy to diverge.
+**Runtime invariant:** No companion is published. The plugin registers one dictionary effect and five slot entries whose disposal the HMR-safety spec proves; application availability, the choice, and the desktop answer live in the controllers' snapshot stores with no second copy to diverge.
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index ec0fe77413..0774e52285 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -45,7 +45,7 @@ kind: "package-reference"
 
 插件通过标准 slot/inject 机制把分体按钮注册到 `conversation.session.header.utilities`，并以一个 effect 注册 `open-in-app` 词典。一个页面生命周期的 controller（[`src/client/controller.ts`](src/client/controller.ts)）拥有每页一次的可用性读取、持久化选择的 snapshot store 与启动 POST；组件经 inject 的 `hooks` 隔间接收两个 store，因此所有会话头部共享同一份事实。文档相对的路由形式与 wire 载荷类型来自主机包的浏览器安全子路径 `@deepseek-ai/dsh-host-open-in-app/shared`。飞行中的启动由 ref 守卫——启动期间的重复点击与菜单选择被整体忽略（否则会持久化一个该手势从未打开的选择）——busy/error 视觉由围绕 `launch` promise 的定时器驱动。
 
-目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，`OpenPathInjected.applications` 通过 [`open-path.ts`](src/client/open-path.ts) 查询 `session.workspacePathApplications`。打开操作使用 `session.openWorkspacePath`，Host 在启动前重新验证指定的关联应用。`FileRouteAction` 通过 `deliverables.file.actions` 为交付卡片和变更对比页提供同一控件，其认证路由保留会话文件校验。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
+目录和文件适配器把应用信息与操作交给 [`OpenTargetButton`](src/client/OpenTargetButton.tsx)，由它统一管理菜单顺序、默认标记、图标、尺寸和操作反馈。文件标题栏和空态共用 `FileOpenTarget`，`OpenPathInjected.applications` 通过 [`open-path.ts`](src/client/open-path.ts) 查询 `session.workspacePathApplications`。打开操作使用 `session.openWorkspacePath`，Host 在启动前重新验证指定的关联应用。`FileRouteAction` 通过 `deliverables.file.actions` 和 `deliverables.review.file.actions` 为交付卡片和变更对比页提供同一控件，其认证路由保留会话文件校验。目录适配器继续使用已有的应用列表路由，文件查询失败或不可用时无需增加平台专用的界面实现。
 
 </details>
 
@@ -92,4 +92,4 @@ Host 在打开或定位前通过当前文件系统验证路径。没有对应 Ho
 
 </details>
 
-**运行时不变式：** 不发布伴生入口。插件注册一个词典 effect 和三个 slot 条目，HMR 安全性 spec 证明它们都会在资源释放时撤销；应用可用性、选择与桌面回答存储在控制器的快照存储中，不存在可能与之分歧的第二份副本。
+**运行时不变式：** 不发布伴生入口。插件注册一个词典 effect 和五个 slot 条目，HMR 安全性 spec 证明它们都会在资源释放时撤销；应用可用性、选择与桌面回答存储在控制器的快照存储中，不存在可能与之分歧的第二份副本。

From 03fde971e2c4c16de9617861192875d2985a28f9 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:02:18 +0800
Subject: [PATCH 36/62] build: allow browser-safe file association metadata
 validation

---
 packages/client/tsdown.client.ts     | 2 +-
 scripts/client-bundle-purity.spec.ts | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/client/tsdown.client.ts b/packages/client/tsdown.client.ts
index b8468c0957..5e9592ba70 100644
--- a/packages/client/tsdown.client.ts
+++ b/packages/client/tsdown.client.ts
@@ -61,7 +61,7 @@ function styleInjectionModule(
  * Everything else under @deepseek-ai/* is either a module-table entry
  * (external) or a leak the purity gate rejects.
  */
-export const INLINE_SAFE = /^(?:@deepseek-ai\/dsh-(?:file-reference|session|llm|tools|brand|deque|output-retention|typert-protocol|util-crypto|util-values|util-workspace-path)(?:\/|$)|@deepseek-ai\/dsh-token-meter\/client$|@deepseek-ai\/dsh-host-open-in-app\/shared$|@deepseek-ai\/dsh-plugin-manager\/registry$|@deepseek-ai\/dsh-agent-presets\/display$|@deepseek-ai\/dsh-spill-policy\/notice$)/
+export const INLINE_SAFE = /^(?:@deepseek-ai\/dsh-(?:file-reference|session|llm|tools|brand|deque|output-retention|typert-protocol|util-crypto|util-values|util-workspace-path)(?:\/|$)|@deepseek-ai\/dsh-token-meter\/client$|@deepseek-ai\/dsh-native-command\/types$|@deepseek-ai\/dsh-host-open-in-app\/shared$|@deepseek-ai\/dsh-plugin-manager\/registry$|@deepseek-ai\/dsh-agent-presets\/display$|@deepseek-ai\/dsh-spill-policy\/notice$)/
 
 /**
  * Vendored framework libraries: rescoped into @deepseek-ai, so the gate below
diff --git a/scripts/client-bundle-purity.spec.ts b/scripts/client-bundle-purity.spec.ts
index ed3ca6a0a8..cf706b334c 100644
--- a/scripts/client-bundle-purity.spec.ts
+++ b/scripts/client-bundle-purity.spec.ts
@@ -141,6 +141,8 @@ describe('client bundle purity gate', () => {
     expect(() => resolveId('@deepseek-ai/dsh-token-meter')).toThrow(/purity/)
     expect(() => resolveId('@deepseek-ai/dsh-token-meter/client/internal')).toThrow(/purity/)
     expect(resolveId('@deepseek-ai/dsh-host-open-in-app/shared')).toBeNull()
+    expect(resolveId('@deepseek-ai/dsh-native-command/types')).toBeNull()
+    expect(() => resolveId('@deepseek-ai/dsh-native-command')).toThrow('client bundle purity')
     expect(() => resolveId('@deepseek-ai/dsh-host-open-in-app')).toThrow(/purity/)
     expect(resolveId('@deepseek-ai/dsh-plugin-manager/registry')).toBeNull()
     expect(() => resolveId('@deepseek-ai/dsh-plugin-manager')).toThrow(/purity/)

From 6f1857ae1bd58480f447d2101190ffaee3099d4e Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:04:54 +0800
Subject: [PATCH 37/62] test: refresh delivery snapshots for shared file
 controls

---
 apps/web/tests/present.e2e.ts                 |  2 +-
 .../tests/present-open.client.spec.ts         |  2 +-
 .../tests/file-route-action.client.spec.tsx   |  2 +-
 snapshots/web/present-svg/session.v4.jsonl    | 29 +++++++++++++++++++
 snapshots/web/present-svg/ui.expected.md      |  2 --
 snapshots/web/present/session.v4.jsonl        | 29 +++++++++++++++++++
 6 files changed, 61 insertions(+), 5 deletions(-)
 create mode 100644 snapshots/web/present-svg/session.v4.jsonl
 create mode 100644 snapshots/web/present/session.v4.jsonl

diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index 0fa592a09a..125c9f6ebe 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -128,7 +128,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       }
       const row = page.locator('[data-presented-files-row]')
       await row.waitFor()
-      expect(await row.getByRole('button', { name: 'More ways to open' }).count()).toBe(2)
+      await expect.poll(() => row.getByRole('button', { name: 'More ways to open' }).count()).toBe(2)
       expect(await row.getByText('report.txt', { exact: true }).innerText()).toBe('report.txt')
       const beforePreview = (await opened()).length
       const column = page.locator('[data-rightbar-col]')
diff --git a/packages/client/ui-deliverables/tests/present-open.client.spec.ts b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
index 6d6d4c4760..468e065ad4 100644
--- a/packages/client/ui-deliverables/tests/present-open.client.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
@@ -181,6 +181,6 @@ it('encodes an explicit application identifier without changing the file coordin
   vi.stubGlobal('fetch', fetcher)
   const controller = new PresentedOpenController()
   expect(await controller.open(id, 2, 1, 'open', '/Apps/A&B.app')).toBeNull()
-  expect(fetcher).toHaveBeenCalledWith(`${url}&application=%2FApps%2FA%26B.app`, { method: 'POST', signal: expect.any(AbortSignal) })
+  expect(fetcher).toHaveBeenCalledWith(`${url}&application=%2FApps%2FA%26B.app`, { method: 'POST', signal: expect.any(AbortSignal) as AbortSignal })
   await controller.dispose()
 })
diff --git a/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx
index 6404ec8b9e..d67cf7127c 100644
--- a/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/file-route-action.client.spec.tsx
@@ -17,7 +17,7 @@ it('queries the authorized route, selects a handler, and keeps reveal last', asy
   const p = props()
   render(<FileRouteAction {...p} />)
   await act(async () => {})
-  expect(fetcher).toHaveBeenCalledWith(p.actionUrl, { signal: expect.any(AbortSignal) })
+  expect(fetcher).toHaveBeenCalledWith(p.actionUrl, { signal: expect.any(AbortSignal) as AbortSignal })
   fireEvent.mouseEnter(screen.getByRole('button', { name: 'Open in Music' }))
   expect(await screen.findByRole('tooltip')).toHaveProperty('textContent', 'Open in Music')
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: en['path.more'] })) })
diff --git a/snapshots/web/present-svg/session.v4.jsonl b/snapshots/web/present-svg/session.v4.jsonl
new file mode 100644
index 0000000000..d844e49889
--- /dev/null
+++ b/snapshots/web/present-svg/session.v4.jsonl
@@ -0,0 +1,29 @@
+{"type":"session","version":4,"id":"{{session:1}}","createdAt":1788926678903,"cwd":"{{cwd}}","isSeeded":false,"delegationDepth":0,"agentPreset":"standard"}
+{"type":"permission/preset","data":{"preset":"workspace-write"}}
+{"type":"sandbox/mode","data":{"mode":"workspace-write"}}
+{"type":"approval/policy","data":{"policy":"ask"}}
+{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"简单画一个 SVG 表示冯诺依曼架构, 保存为 von-neumann.svg"}],"source":{"kind":"user","rpcId":"{{rpc:1}}","clientTimeZone":"{{clientTimeZone}}"},"role":"user","id":"{{message:1}}"}]}}
+{"type":"turn/start","data":{"turn":1}}
+{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","data":{"turn":1,"step":1}}
+{"type":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:2}}"}},"surfaceOp":"append"}
+{"type":"user/message","data":{"content":[{"type":"text","text":"简单画一个 SVG 表示冯诺依曼架构, 保存为 von-neumann.svg"}],"source":{"kind":"user","rpcId":"{{rpc:1}}","clientTimeZone":"{{clientTimeZone}}"},"role":"user","id":"{{message:1}}"},"surfaceOp":"append"}
+{"type":"user/message","data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"runtime-context","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable."},{"name":"approval:policy","text":"Approval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}]},"role":"user","id":"{{message:3}}"},"surfaceOp":"append"}
+{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash","contextWindow":128000}}
+{"type":"session/title","data":{"title":"简单画一个 SVG 表示冯诺依曼","messageSeqs":[8],"source":{"kind":"fallback"}}}
+{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants a simple SVG diagram of the von Neumann architecture, saved as von-neumann.svg. Let me create a clean SVG showing CPU (control unit, ALU), memory, input, and output with bidirectional data/control buses.\n\nLet me write the file."},{"type":"text","text":"我来创建一个冯诺依曼架构的 SVG 示意图。"},{"type":"tool-call","id":"call_00_yxav8LdZ9iwWpgkUnspF6361","name":"write","arguments":"{\"file_path\": \"{{cwd}}/von-neumann.svg\", \"content\": \"<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" viewBox=\\\"0 0 900 560\\\" width=\\\"900\\\" height=\\\"560\\\" font-family=\\\"Helvetica, Arial, sans-serif\\\">\\n  <title>冯诺依曼架构</title>\\n\\n  <defs>\\n    <marker id=\\\"arrow\\\" markerWidth=\\\"10\\\" markerHeight=\\\"10\\\" refX=\\\"8\\\" refY=\\\"3\\\" orient=\\\"auto\\\">\\n      <path d=\\\"M0,0 L8,3 L0,6 Z\\\" fill=\\\"#555\\\"/>\\n    </marker>\\n  </defs>\\n\\n  <!-- Background -->\\n  <rect x=\\\"0\\\" y=\\\"0\\\" width=\\\"900\\\" height=\\\"560\\\" fill=\\\"#fafbfc\\\"/>\\n  <text x=\\\"450\\\" y=\\\"34\\\" text-anchor=\\\"middle\\\" font-size=\\\"22\\\" font-weight=\\\"bold\\\" fill=\\\"#222\\\">冯诺依曼体系结构 (Von Neumann Architecture)</text>\\n\\n  <!-- ===== CPU ===== -->\\n  <rect x=\\\"300\\\" y=\\\"70\\\" width=\\\"300\\\" height=\\\"240\\\" rx=\\\"10\\\" fill=\\\"#fff\\\" stroke=\\\"#1f6feb\\\" stroke-width=\\\"2.5\\\"/>\\n  <text x=\\\"450\\\" y=\\\"98\\\" text-anchor=\\\"middle\\\" font-size=\\\"17\\\" font-weight=\\\"bold\\\" fill=\\\"#1f6feb\\\">中央处理器 CPU</text>\\n\\n  <!-- Control Unit -->\\n  <rect x=\\\"325\\\" y=\\\"118\\\" width=\\\"120\\\" height=\\\"160\\\" rx=\\\"8\\\" fill=\\\"#ddf4ff\\\" stroke=\\\"#54aeff\\\" stroke-width=\\\"1.5\\\"/>\\n  <text x=\\\"385\\\" y=\\\"142\\\" text-anchor=\\\"middle\\\" font-size=\\\"12.5\\\" font-weight=\\\"bold\\\" fill=\\\"#0969da\\\">控制单元</text>\\n  <text x=\\\"385\\\" y=\\\"158\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#0b5394\\\">CU</text>\\n  <text x=\\\"385\\\" y=\\\"262\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">指令译码 · 时序控制</text>\\n\\n  <!-- ALU -->\\n  <rect x=\\\"455\\\" y=\\\"118\\\" width=\\\"120\\\" height=\\\"160\\\" rx=\\\"8\\\" fill=\\\"#fff8c5\\\" stroke=\\\"#d4a72c\\\" stroke-width=\\\"1.5\\\"/>\\n  <text x=\\\"515\\\" y=\\\"142\\\" text-anchor=\\\"middle\\\" font-size=\\\"12.5\\\" font-weight=\\\"bold\\\" fill=\\\"#9a6700\\\">算术逻辑单元</text>\\n  <text x=\\\"515\\\" y=\\\"158\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#7a5200\\\">ALU</text>\\n  <text x=\\\"515\\\" y=\\\"262\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">算术运算 · 逻辑运算</text>\\n\\n  <!-- Registers -->\\n  <rect x=\\\"330\\\" y=\\\"186\\\" width=\\\"110\\\" height=\\\"56\\\" rx=\\\"6\\\" fill=\\\"#fff\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.2\\\" stroke-dasharray=\\\"4,3\\\"/>\\n  <text x=\\\"385\\\" y=\\\"208\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#444\\\">寄存器组</text>\\n  <text x=\\\"385\\\" y=\\\"224\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\">Registers / 缓存</text>\\n\\n  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font-size=\\\"11\\\" fill=\\\"#444\\\">Input</text>\\n  <text x=\\\"125\\\" y=\\\"238\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\">键盘 · 鼠标 · 磁盘</text>\\n\\n  <!-- ===== Output ===== -->\\n  <rect x=\\\"690\\\" y=\\\"150\\\" width=\\\"170\\\" height=\\\"120\\\" rx=\\\"10\\\" fill=\\\"#fff\\\" stroke=\\\"#bf3989\\\" stroke-width=\\\"2.5\\\"/>\\n  <text x=\\\"775\\\" y=\\\"186\\\" text-anchor=\\\"middle\\\" font-size=\\\"15\\\" font-weight=\\\"bold\\\" fill=\\\"#bf3989\\\">输出设备</text>\\n  <text x=\\\"775\\\" y=\\\"206\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#444\\\">Output</text>\\n  <text x=\\\"775\\\" y=\\\"238\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\">显示器 · 打印机</text>\\n\\n  <!-- ===== Bus lines ===== -->\\n  <!-- Address bus CPU <-> Memory (red) -->\\n  <path d=\\\"M450,320 L450,398\\\" fill=\\\"none\\\" stroke=\\\"#cf222e\\\" stroke-width=\\\"3\\\"/>\\n  <text x=\\\"420\\\" y=\\\"362\\\" text-anchor=\\\"end\\\" font-size=\\\"11\\\" fill=\\\"#cf222e\\\" transform=\\\"rotate(-90 420 362)\\\">地址总线</text>\\n\\n  <!-- Data/control bus label along the bottom -->\\n  <line x1=\\\"300\\\" y1=\\\"355\\\" x2=\\\"600\\\" y2=\\\"355\\\" stroke=\\\"#555\\\" stroke-width=\\\"1\\\" stroke-dasharray=\\\"2,3\\\" opacity=\\\"0.0\\\"/>\\n  <text x=\\\"450\\\" y=\\\"353\\\" text-anchor=\\\"middle\\\" font-size=\\\"12\\\" font-weight=\\\"bold\\\" fill=\\\"#555\\\">← 数据总线 / 控制总线 →</text>\\n\\n  <!-- CPU <-> Input (bidirectional-ish: input data in + control out) -->\\n  <path d=\\\"M212,210 L298,210\\\" fill=\\\"none\\\" stroke=\\\"#1a7f37\\\" stroke-width=\\\"3\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <path d=\\\"M212,196 L298,196\\\" fill=\\\"none\\\" stroke=\\\"#555\\\" stroke-width=\\\"2\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"255\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#1a7f37\\\">数据(输入)</text>\\n  <text x=\\\"255\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- CPU <-> Output -->\\n  <path d=\\\"M602,210 L688,210\\\" fill=\\\"none\\\" stroke=\\\"#bf3989\\\" stroke-width=\\\"3\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <path d=\\\"M602,196 L688,196\\\" fill=\\\"none\\\" stroke=\\\"#555\\\" stroke-width=\\\"2\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"645\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#bf3989\\\">数据(输出)</text>\\n  <text x=\\\"645\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- Memory <-> Input/Output hints: 存储器与 I/O 也通过总线交换 -->\\n  <path d=\\\"M125,272 L125,300 Q125,340 175,340 L298,340\\\" fill=\\\"none\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.8\\\" stroke-dasharray=\\\"6,4\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"160\\\" y=\\\"328\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\" transform=\\\"rotate(-8 160 328)\\\">总线</text>\\n\\n  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Let me create a clean SVG showing CPU (control unit, ALU), memory, input, and output with bidirectional data/control buses.\n\nLet me write the file."}}},{"type":"chunk","time":1789457782585,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"我来创建一个冯诺依曼架构的 SVG 示意图。"}}},{"type":"chunk","time":1789457782585,"chunk":{"type":"block-end","index":2,"block":{"type":"tool-call","id":"call_00_yxav8LdZ9iwWpgkUnspF6361","name":"write","arguments":"{\"file_path\": \"{{cwd}}/von-neumann.svg\", \"content\": \"<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" viewBox=\\\"0 0 900 560\\\" width=\\\"900\\\" height=\\\"560\\\" font-family=\\\"Helvetica, Arial, sans-serif\\\">\\n  <title>冯诺依曼架构</title>\\n\\n  <defs>\\n    <marker id=\\\"arrow\\\" markerWidth=\\\"10\\\" markerHeight=\\\"10\\\" refX=\\\"8\\\" refY=\\\"3\\\" orient=\\\"auto\\\">\\n      <path d=\\\"M0,0 L8,3 L0,6 Z\\\" fill=\\\"#555\\\"/>\\n    </marker>\\n  </defs>\\n\\n  <!-- Background -->\\n  <rect x=\\\"0\\\" y=\\\"0\\\" width=\\\"900\\\" height=\\\"560\\\" fill=\\\"#fafbfc\\\"/>\\n  <text x=\\\"450\\\" y=\\\"34\\\" text-anchor=\\\"middle\\\" font-size=\\\"22\\\" font-weight=\\\"bold\\\" fill=\\\"#222\\\">冯诺依曼体系结构 (Von Neumann Architecture)</text>\\n\\n  <!-- ===== CPU ===== -->\\n  <rect x=\\\"300\\\" y=\\\"70\\\" width=\\\"300\\\" height=\\\"240\\\" rx=\\\"10\\\" fill=\\\"#fff\\\" stroke=\\\"#1f6feb\\\" stroke-width=\\\"2.5\\\"/>\\n  <text x=\\\"450\\\" y=\\\"98\\\" text-anchor=\\\"middle\\\" font-size=\\\"17\\\" font-weight=\\\"bold\\\" fill=\\\"#1f6feb\\\">中央处理器 CPU</text>\\n\\n  <!-- Control Unit -->\\n  <rect x=\\\"325\\\" y=\\\"118\\\" width=\\\"120\\\" height=\\\"160\\\" rx=\\\"8\\\" fill=\\\"#ddf4ff\\\" stroke=\\\"#54aeff\\\" stroke-width=\\\"1.5\\\"/>\\n  <text x=\\\"385\\\" y=\\\"142\\\" text-anchor=\\\"middle\\\" font-size=\\\"12.5\\\" font-weight=\\\"bold\\\" fill=\\\"#0969da\\\">控制单元</text>\\n  <text x=\\\"385\\\" y=\\\"158\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#0b5394\\\">CU</text>\\n  <text x=\\\"385\\\" y=\\\"262\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">指令译码 · 时序控制</text>\\n\\n  <!-- ALU -->\\n  <rect x=\\\"455\\\" y=\\\"118\\\" width=\\\"120\\\" height=\\\"160\\\" rx=\\\"8\\\" fill=\\\"#fff8c5\\\" stroke=\\\"#d4a72c\\\" stroke-width=\\\"1.5\\\"/>\\n  <text x=\\\"515\\\" y=\\\"142\\\" text-anchor=\\\"middle\\\" font-size=\\\"12.5\\\" font-weight=\\\"bold\\\" fill=\\\"#9a6700\\\">算术逻辑单元</text>\\n  <text x=\\\"515\\\" y=\\\"158\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#7a5200\\\">ALU</text>\\n  <text x=\\\"515\\\" y=\\\"262\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">算术运算 · 逻辑运算</text>\\n\\n  <!-- Registers -->\\n  <rect x=\\\"330\\\" y=\\\"186\\\" width=\\\"110\\\" height=\\\"56\\\" rx=\\\"6\\\" fill=\\\"#fff\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.2\\\" stroke-dasharray=\\\"4,3\\\"/>\\n  <text x=\\\"385\\\" y=\\\"208\\\" text-anchor=\\\"middle\\\" 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x=\\\"255\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#1a7f37\\\">数据(输入)</text>\\n  <text x=\\\"255\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- CPU <-> Output -->\\n  <path d=\\\"M602,210 L688,210\\\" fill=\\\"none\\\" stroke=\\\"#bf3989\\\" stroke-width=\\\"3\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <path d=\\\"M602,196 L688,196\\\" fill=\\\"none\\\" stroke=\\\"#555\\\" stroke-width=\\\"2\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"645\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#bf3989\\\">数据(输出)</text>\\n  <text x=\\\"645\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- Memory <-> Input/Output hints: 存储器与 I/O 也通过总线交换 -->\\n  <path d=\\\"M125,272 L125,300 Q125,340 175,340 L298,340\\\" fill=\\\"none\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.8\\\" stroke-dasharray=\\\"6,4\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"160\\\" y=\\\"328\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\" transform=\\\"rotate(-8 160 328)\\\">总线</text>\\n\\n  <path d=\\\"M775,272 L775,300 Q775,340 725,340 L602,340\\\" fill=\\\"none\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.8\\\" stroke-dasharray=\\\"6,4\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"740\\\" y=\\\"328\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\" transform=\\\"rotate(8 740 328)\\\">总线</text>\\n\\n  <!-- Stored-program note -->\\n  <text x=\\\"450\\\" y=\\\"530\\\" text-anchor=\\\"middle\\\" font-size=\\\"11.5\\\" fill=\\\"#666\\\">核心思想: 指令与数据以二进制形式统一存放在存储器中 —— 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磁盘</text>\\n\\n  <!-- ===== Output ===== -->\\n  <rect x=\\\"690\\\" y=\\\"150\\\" width=\\\"170\\\" height=\\\"120\\\" rx=\\\"10\\\" fill=\\\"#fff\\\" stroke=\\\"#bf3989\\\" stroke-width=\\\"2.5\\\"/>\\n  <text x=\\\"775\\\" y=\\\"186\\\" text-anchor=\\\"middle\\\" font-size=\\\"15\\\" font-weight=\\\"bold\\\" fill=\\\"#bf3989\\\">输出设备</text>\\n  <text x=\\\"775\\\" y=\\\"206\\\" text-anchor=\\\"middle\\\" font-size=\\\"11\\\" fill=\\\"#444\\\">Output</text>\\n  <text x=\\\"775\\\" y=\\\"238\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\">显示器 · 打印机</text>\\n\\n  <!-- ===== Bus lines ===== -->\\n  <!-- Address bus CPU <-> Memory (red) -->\\n  <path d=\\\"M450,320 L450,398\\\" fill=\\\"none\\\" stroke=\\\"#cf222e\\\" stroke-width=\\\"3\\\"/>\\n  <text x=\\\"420\\\" y=\\\"362\\\" text-anchor=\\\"end\\\" font-size=\\\"11\\\" fill=\\\"#cf222e\\\" transform=\\\"rotate(-90 420 362)\\\">地址总线</text>\\n\\n  <!-- Data/control bus label along the bottom -->\\n  <line x1=\\\"300\\\" y1=\\\"355\\\" x2=\\\"600\\\" y2=\\\"355\\\" stroke=\\\"#555\\\" stroke-width=\\\"1\\\" stroke-dasharray=\\\"2,3\\\" opacity=\\\"0.0\\\"/>\\n  <text x=\\\"450\\\" y=\\\"353\\\" text-anchor=\\\"middle\\\" font-size=\\\"12\\\" font-weight=\\\"bold\\\" fill=\\\"#555\\\">← 数据总线 / 控制总线 →</text>\\n\\n  <!-- CPU <-> Input (bidirectional-ish: input data in + control out) -->\\n  <path d=\\\"M212,210 L298,210\\\" fill=\\\"none\\\" stroke=\\\"#1a7f37\\\" stroke-width=\\\"3\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <path d=\\\"M212,196 L298,196\\\" fill=\\\"none\\\" stroke=\\\"#555\\\" stroke-width=\\\"2\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"255\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#1a7f37\\\">数据(输入)</text>\\n  <text x=\\\"255\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- CPU <-> Output -->\\n  <path d=\\\"M602,210 L688,210\\\" fill=\\\"none\\\" stroke=\\\"#bf3989\\\" stroke-width=\\\"3\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <path d=\\\"M602,196 L688,196\\\" fill=\\\"none\\\" stroke=\\\"#555\\\" stroke-width=\\\"2\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"645\\\" y=\\\"184\\\" text-anchor=\\\"middle\\\" font-size=\\\"10.5\\\" fill=\\\"#bf3989\\\">数据(输出)</text>\\n  <text x=\\\"645\\\" y=\\\"236\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#555\\\">控制</text>\\n\\n  <!-- Memory <-> Input/Output hints: 存储器与 I/O 也通过总线交换 -->\\n  <path d=\\\"M125,272 L125,300 Q125,340 175,340 L298,340\\\" fill=\\\"none\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.8\\\" stroke-dasharray=\\\"6,4\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"160\\\" y=\\\"328\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\" transform=\\\"rotate(-8 160 328)\\\">总线</text>\\n\\n  <path d=\\\"M775,272 L775,300 Q775,340 725,340 L602,340\\\" fill=\\\"none\\\" stroke=\\\"#8c959f\\\" stroke-width=\\\"1.8\\\" stroke-dasharray=\\\"6,4\\\" marker-end=\\\"url(#arrow)\\\"/>\\n  <text x=\\\"740\\\" y=\\\"328\\\" text-anchor=\\\"middle\\\" font-size=\\\"10\\\" fill=\\\"#666\\\" transform=\\\"rotate(8 740 328)\\\">总线</text>\\n\\n  <!-- Stored-program note -->\\n  <text x=\\\"450\\\" y=\\\"530\\\" text-anchor=\\\"middle\\\" font-size=\\\"11.5\\\" fill=\\\"#666\\\">核心思想: 指令与数据以二进制形式统一存放在存储器中 —— “存储程序”</text>\\n</svg>\\n\"}"}}
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+{"type":"assistant/message","data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"text","text":"已创建 `von-neumann.svg`，一个简洁的冯诺依曼架构示意图，包含：\n\n- **CPU（中央处理器）**：内含控制单元 CU、算术逻辑单元 ALU 和寄存器组\n- **内存储器 Memory**：标注\"指令和数据统一存放\"（存储程序思想）\n- **输入设备 / 输出设备**：分别用绿色和粉色表示数据流向\n- **总线连接**：CPU 与内存间的地址总线，以及 CPU 与 I/O 设备间的数据/控制线，箭头标明数据流向\n\n下方附一行核心思想说明：指令与数据以二进制统一存储在存储器中。用浏览器打开该 SVG 文件即可查看。"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"{{message:8}}"},"usage":{"inputTokens":56,"outputTokens":145,"totalTokens":10825,"cacheReadTokens":10624,"reasoningTokens":0},"stream":[{"type":"chunk","time":1789457782649,"chunk":{"type":"block-start","index":0,"blockType":"text"}},{"type":"text-chunks","time0":1789457782649,"index":0,"dt":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"texts":["已","创建"," `","von","-","neum","ann",".svg","`","，","一个","简洁","的","冯","诺","依","曼","架构","示意图","，","包含","：\n\n","-"," **","CPU","（","中央","处理器","）","**","：","内含","控制","单元"," CU","、","算术","逻辑","单元"," AL","U"," ","和","寄存器","组","\n","-"," **","内","存储器"," Memory","**","：","标注","\"","指令","和数据","统一","存放","\"","（","存储","程序","思想","）\n","-"," **","输入","设备"," /"," ","输出","设备","**","：","分别","用","绿色","和","粉色","表示","数据","流向","\n","-"," **","总线","连接","**","：","CPU"," ","与","内存","间的","地址","总线","，","以及"," CPU"," ","与"," I","/O"," ","设备","间的","数据","/","控制","线","，","箭头","标明","数据","流向","\n\n","下方","附","一行","核心","思想","说明","：","指令","与","数据","以","二进制","统一","存储在","存储器","中","。","用","浏览器","打开","该"," SVG"," ","文件","即可","查看","。"]},{"type":"chunk","time":1789457782650,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"已创建 `von-neumann.svg`，一个简洁的冯诺依曼架构示意图，包含：\n\n- **CPU（中央处理器）**：内含控制单元 CU、算术逻辑单元 ALU 和寄存器组\n- **内存储器 Memory**：标注\"指令和数据统一存放\"（存储程序思想）\n- **输入设备 / 输出设备**：分别用绿色和粉色表示数据流向\n- **总线连接**：CPU 与内存间的地址总线，以及 CPU 与 I/O 设备间的数据/控制线，箭头标明数据流向\n\n下方附一行核心思想说明：指令与数据以二进制统一存储在存储器中。用浏览器打开该 SVG 文件即可查看。"}}},{"type":"chunk","time":1789457782650,"chunk":{"type":"usage","usage":{"inputTokens":56,"outputTokens":145,"totalTokens":10825,"cacheReadTokens":10624,"reasoningTokens":0}}},{"type":"chunk","time":1789457782650,"chunk":{"type":"finish","reason":{"kind":"stop"}}}]},"surfaceOp":"append"}
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diff --git a/snapshots/web/present-svg/ui.expected.md b/snapshots/web/present-svg/ui.expected.md
index c867d85c45..47b47909c6 100644
--- a/snapshots/web/present-svg/ui.expected.md
+++ b/snapshots/web/present-svg/ui.expected.md
@@ -37,8 +37,6 @@
 - text: 此主机没有可用的桌面，无法使用外部程序打开文件或文件夹；文件仍可在侧边栏预览
 - button "在侧边栏预览 von-neumann.svg"
 - text: von-neumann.svg 冯诺依曼架构示意图 SVG
-- button "在侧边栏打开 von-neumann.svg": 打开
-- button "von-neumann.svg 的更多文件操作" [disabled]
 - button "复制"
 - button "好的回答"
 - button "有问题的回答"
diff --git a/snapshots/web/present/session.v4.jsonl b/snapshots/web/present/session.v4.jsonl
new file mode 100644
index 0000000000..442cd7b022
--- /dev/null
+++ b/snapshots/web/present/session.v4.jsonl
@@ -0,0 +1,29 @@
+{"type":"session","version":4,"id":"{{session:1}}","createdAt":1788883598275,"cwd":"{{cwd}}","isSeeded":false,"delegationDepth":0,"agentPreset":"ptc"}
+{"type":"permission/preset","data":{"preset":"workspace-write"}}
+{"type":"sandbox/mode","data":{"mode":"workspace-write"}}
+{"type":"approval/policy","data":{"policy":"ask"}}
+{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Use one run_code program to do the following in order. Call present for missing.txt and catch its error without creating that file. Use bash to run exactly `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`. Call present for report.txt and 说明.txt. After present succeeds, deliberately throw the string \"AFTER_PRESENT\" (not an Error object) from that same run_code program. Do not retry the program or create any other files. Finish by mentioning `report.txt` and `说明.txt` in inline code, and put PRESENT_DONE in a separate paragraph."}],"source":{"kind":"user","rpcId":"{{rpc:1}}","clientTimeZone":"{{clientTimeZone}}"},"role":"user","id":"{{message:1}}"}]}}
+{"type":"turn/start","data":{"turn":1}}
+{"type":"agent/inbox/spliced","data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
+{"type":"step/start","data":{"turn":1,"step":1}}
+{"type":"system/message","data":{"turn":1,"step":1,"message":{"role":"system","content":[{"type":"text","text":"{{system}}"}],"source":{"kind":"system-prompt"},"id":"{{message:2}}"}},"surfaceOp":"append"}
+{"type":"user/message","data":{"content":[{"type":"text","text":"Use one run_code program to do the following in order. Call present for missing.txt and catch its error without creating that file. Use bash to run exactly `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`. Call present for report.txt and 说明.txt. After present succeeds, deliberately throw the string \"AFTER_PRESENT\" (not an Error object) from that same run_code program. Do not retry the program or create any other files. Finish by mentioning `report.txt` and `说明.txt` in inline code, and put PRESENT_DONE in a separate paragraph."}],"source":{"kind":"user","rpcId":"{{rpc:1}}","clientTimeZone":"{{clientTimeZone}}"},"role":"user","id":"{{message:1}}"},"surfaceOp":"append"}
+{"type":"user/message","data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nCurrent DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable.\n\nApproval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}],"source":{"kind":"runtime-context","form":"snapshot","sections":[{"name":"sandbox:policy","text":"Current DSH file policy: workspace-write. Any available operation enforced by the DSH file sandbox may modify files under the session workspace: \"{{cwd}}\". Some platform temporary areas may also be writable."},{"name":"approval:policy","text":"Approval policy: ask. Operations that require approval may ask through the configured answerers; without an available answerer, the request fails closed."}]},"role":"user","id":"{{message:3}}"},"surfaceOp":"append"}
+{"type":"request/header","data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"tools":"{{tools}}"},"reason":"initial"}}
+{"type":"request/context","data":{"provider":"deepseek-official","model":"deepseek-v4-flash","contextWindow":128000}}
+{"type":"session/title","data":{"title":"Use one run_code program to","messageSeqs":[8],"source":{"kind":"fallback"}}}
+{"type":"assistant/message","data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user wants one run_code program that:\n1. Calls present for missing.txt and catches its error without creating that file.\n2. Uses bash to run exactly `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`.\n3. Calls present for report.txt and 说明.txt.\n4. After present succeeds, deliberately throws the string \"AFTER_PRESENT\" (not an Error object) from that same run_code program.\n5. Does not retry the program or create other files.\n6. Finishes by mentioning report.txt and 说明.txt in inline code, and put PRESENT_DONE in a separate paragraph.\n\nLet me write the program.\n\npresent tool args: { files: [{ path, description? }] }.\n\nSo first: try present for missing.txt — catch error. It should error because the file doesn't exist (present requires existing workspace file).\n\nThen bash run exact command. Note the command uses `;` inside a single string. Run as a single command string: `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`.\n\nWait — printf interprets the arguments... In bash, `printf \"DELIVERED_REPORT\\n\"` with the format string containing \\n — printf will interpret \\n as newline. Good.\n\nThen present for report.txt and 说明.txt.\n\nThen throw \"AFTER_PRESENT\" string. In TS async function body, `throw \"AFTER_PRESENT\"` works.\n\nLet me write it."},{"type":"tool-call","id":"call_00_GgvYPol45qxGf6GezK3L3590","name":"run_code","arguments":"{\"code\": \"// Step 1: present for missing.txt — must fail, catch the error, don't create the file\\ntry {\\n  await tools.present({ files: [{ path: \\\"missing.txt\\\", description: \\\"must not exist\\\" }] });\\n  console.log(\\\"UNEXPECTED: present succeeded for missing.txt\\\");\\n} catch (err) {\\n  console.log(\\\"Caught present error for missing.txt:\\\", typeof err, String(err).slice(0, 200));\\n}\\n\\n// Step 2: run the exact bash command to create the two report files\\nconst res = await tools.bash({\\n  command: 'printf \\\"DELIVERED_REPORT\\\\n\\\" > report.txt; printf \\\"DELIVERED_NOTE\\\\n\\\" > 说明.txt',\\n  description: \\\"Write DELIVERED_REPORT and DELIVERED_NOTE to files\\\",\\n});\\nconsole.log(\\\"bash exit:\\\", res.exitCode);\\n\\n// Step 3: present for report.txt and 说明.txt (must succeed)\\nconst p2 = await tools.present({\\n  files: [\\n    { path: \\\"report.txt\\\", description: \\\"delivered report\\\" },\\n    { path: \\\"说明.txt\\\", description: \\\"delivered note\\\" },\\n  ],\\n});\\nconsole.log(\\\"present ok, files:\\\", p2.files.map((f) => f.path).join(\\\", \\\"));\\n\\n// Step 4: deliberately throw a plain string AFTER_PRESENT (not an Error)\\nthrow \\\"AFTER_PRESENT\\\";\", \"description\": \"Present files then deliberately throw 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Calls present for missing.txt and catches its error without creating that file.\n2. Uses bash to run exactly `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`.\n3. Calls present for report.txt and 说明.txt.\n4. After present succeeds, deliberately throws the string \"AFTER_PRESENT\" (not an Error object) from that same run_code program.\n5. Does not retry the program or create other files.\n6. Finishes by mentioning report.txt and 说明.txt in inline code, and put PRESENT_DONE in a separate paragraph.\n\nLet me write the program.\n\npresent tool args: { files: [{ path, description? }] }.\n\nSo first: try present for missing.txt — catch error. It should error because the file doesn't exist (present requires existing workspace file).\n\nThen bash run exact command. Note the command uses `;` inside a single string. Run as a single command string: `printf \"DELIVERED_REPORT\\n\" > report.txt; printf \"DELIVERED_NOTE\\n\" > 说明.txt`.\n\nWait — printf interprets the arguments... In bash, `printf \"DELIVERED_REPORT\\n\"` with the format string containing \\n — printf will interpret \\n as newline. Good.\n\nThen present for report.txt and 说明.txt.\n\nThen throw \"AFTER_PRESENT\" string. In TS async function body, `throw \"AFTER_PRESENT\"` works.\n\nLet me write it."}}},{"type":"chunk","time":1788883599125,"chunk":{"type":"block-end","index":1,"block":{"type":"tool-call","id":"call_00_GgvYPol45qxGf6GezK3L3590","name":"run_code","arguments":"{\"code\": \"// Step 1: present for missing.txt — must fail, catch the error, don't create the file\\ntry {\\n  await tools.present({ files: [{ path: \\\"missing.txt\\\", description: \\\"must not exist\\\" }] });\\n  console.log(\\\"UNEXPECTED: present succeeded for missing.txt\\\");\\n} catch (err) {\\n  console.log(\\\"Caught present error for missing.txt:\\\", typeof err, String(err).slice(0, 200));\\n}\\n\\n// Step 2: run the exact bash command to create the two report files\\nconst res = await tools.bash({\\n  command: 'printf \\\"DELIVERED_REPORT\\\\n\\\" > report.txt; printf \\\"DELIVERED_NOTE\\\\n\\\" > 说明.txt',\\n  description: \\\"Write DELIVERED_REPORT and DELIVERED_NOTE to files\\\",\\n});\\nconsole.log(\\\"bash exit:\\\", res.exitCode);\\n\\n// Step 3: present for report.txt and 说明.txt (must succeed)\\nconst p2 = await tools.present({\\n  files: [\\n    { path: \\\"report.txt\\\", description: \\\"delivered report\\\" },\\n    { path: \\\"说明.txt\\\", description: \\\"delivered note\\\" },\\n  ],\\n});\\nconsole.log(\\\"present ok, files:\\\", p2.files.map((f) => f.path).join(\\\", \\\"));\\n\\n// Step 4: deliberately throw a plain string AFTER_PRESENT (not an Error)\\nthrow \\\"AFTER_PRESENT\\\";\", \"description\": \"Present files then deliberately throw AFTER_PRESENT\"}"}}},{"type":"chunk","time":1788883599125,"chunk":{"type":"usage","usage":{"inputTokens":981,"outputTokens":695,"totalTokens":9356,"cacheReadTokens":7680,"reasoningTokens":329}}},{"type":"chunk","time":1788883599125,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}]},"surfaceOp":"append"}
+{"type":"tool/call","data":{"turn":1,"step":1,"callId":"call_00_GgvYPol45qxGf6GezK3L3590","name":"run_code","arguments":"{\"code\": \"// Step 1: present for missing.txt — must fail, catch the error, don't create the file\\ntry {\\n  await tools.present({ files: [{ path: \\\"missing.txt\\\", description: \\\"must not exist\\\" }] });\\n  console.log(\\\"UNEXPECTED: present succeeded for missing.txt\\\");\\n} catch (err) {\\n  console.log(\\\"Caught present error for missing.txt:\\\", typeof err, String(err).slice(0, 200));\\n}\\n\\n// Step 2: run the exact bash command to create the two report files\\nconst res = await tools.bash({\\n  command: 'printf \\\"DELIVERED_REPORT\\\\n\\\" > report.txt; printf \\\"DELIVERED_NOTE\\\\n\\\" > 说明.txt',\\n  description: \\\"Write DELIVERED_REPORT and DELIVERED_NOTE to files\\\",\\n});\\nconsole.log(\\\"bash exit:\\\", res.exitCode);\\n\\n// Step 3: present for report.txt and 说明.txt (must succeed)\\nconst p2 = await tools.present({\\n  files: [\\n    { path: \\\"report.txt\\\", description: \\\"delivered report\\\" },\\n    { path: \\\"说明.txt\\\", description: \\\"delivered note\\\" },\\n  ],\\n});\\nconsole.log(\\\"present ok, files:\\\", p2.files.map((f) => f.path).join(\\\", \\\"));\\n\\n// Step 4: deliberately throw a plain string AFTER_PRESENT (not an Error)\\nthrow \\\"AFTER_PRESENT\\\";\", \"description\": \"Present files then deliberately throw AFTER_PRESENT\"}"}}
+{"type":"tool/ptc-dispatch-start","data":{"rootCallId":"call_00_GgvYPol45qxGf6GezK3L3590","parentCallId":"call_00_GgvYPol45qxGf6GezK3L3590","subCallId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:1","name":"present","arguments":{"files":[{"path":"missing.txt","description":"must not exist"}]}}}
+{"type":"tool/ptc-dispatch","data":{"rootCallId":"call_00_GgvYPol45qxGf6GezK3L3590","parentCallId":"call_00_GgvYPol45qxGf6GezK3L3590","subCallId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:1","name":"present","arguments":{"files":[{"path":"missing.txt","description":"must not exist"}]},"isError":true,"error":{"name":"FsError","code":"FS_NOT_FOUND"},"content":[{"type":"text","text":"Error: Cannot present missing.txt: file not found. Check the path, create the file if needed, and retry."}]}}
+{"type":"tool/ptc-dispatch-start","data":{"rootCallId":"call_00_GgvYPol45qxGf6GezK3L3590","parentCallId":"call_00_GgvYPol45qxGf6GezK3L3590","subCallId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:2","name":"bash","arguments":{"command":"printf \"DELIVERED_REPORT\n\" > report.txt; printf \"DELIVERED_NOTE\n\" > 说明.txt","description":"Write DELIVERED_REPORT and DELIVERED_NOTE to files"}}}
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+{"type":"tool/ptc-dispatch-start","data":{"rootCallId":"call_00_GgvYPol45qxGf6GezK3L3590","parentCallId":"call_00_GgvYPol45qxGf6GezK3L3590","subCallId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:3","name":"present","arguments":{"files":[{"path":"report.txt","description":"delivered report"},{"path":"说明.txt","description":"delivered note"}]}}}
+{"type":"deliverables/presented","data":{"turn":1,"callId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:3","files":[{"path":"report.txt","description":"delivered report"},{"path":"说明.txt","description":"delivered note"}]}}
+{"type":"tool/ptc-dispatch","data":{"rootCallId":"call_00_GgvYPol45qxGf6GezK3L3590","parentCallId":"call_00_GgvYPol45qxGf6GezK3L3590","subCallId":"call_00_GgvYPol45qxGf6GezK3L3590:ptc:3","name":"present","arguments":{"files":[{"path":"report.txt","description":"delivered report"},{"path":"说明.txt","description":"delivered note"}]},"isError":false,"content":[{"type":"text","text":"Presented report.txt\nPresented 说明.txt"}]}}
+{"type":"tool/result","data":{"turn":1,"step":1,"message":{"role":"tool","source":{"kind":"tool","callId":"call_00_GgvYPol45qxGf6GezK3L3590"},"toolCallId":"call_00_GgvYPol45qxGf6GezK3L3590","content":[{"type":"text","text":"Error: code run failed (exception): AFTER_PRESENT\nCaptured output:\nCaught present error for missing.txt: object ToolCallError: Cannot present missing.txt: file not found. Check the path, create the file if needed, and retry.\nbash exit: 0\npresent ok, files: report.txt, 说明.txt\nFile sandbox: workspace-write; enforcement: full."}],"isError":true,"id":"{{message:5}}"},"error":{"name":"CodeRunFailedError","code":"CODE_RUN_FAILED"}},"sourceEventSeqs":[14],"surfaceOp":"append"}
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From a6daee84ca5a7f945675b39cd83a969820a438c4 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:06:00 +0800
Subject: [PATCH 38/62] test: enable the shared opener in the delivery replay

---
 apps/web/tests/present.e2e.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index 125c9f6ebe..fb23c2db8e 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -6,6 +6,7 @@ import { chromium, type Browser, type Page } from 'playwright'
 import { unzipSync, strFromU8 } from 'fflate'
 import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest'
 import { tmpdir, release } from 'node:os'
+import { createLaunchEnvironmentSnapshot } from '@deepseek-ai/dsh-launch-environment'
 import type { SessionEvent, SessionId } from '@deepseek-ai/dsh-session'
 import type {} from '@deepseek-ai/dsh-tool-present/types'
 import {
@@ -53,6 +54,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
     vi.stubEnv('PATH', `${nativeRoot}${delimiter}${process.env.PATH ?? ''}`)
     await mkdir(DIR, { recursive: true })
     scaffold = await launchWebScaffold({
+      openInAppEnvironment: createLaunchEnvironmentSnapshot([{ source: 'process', values: { SSH_CONNECTION: '10.0.0.2 55000 10.0.0.9 22' } }]),
       extraOverlayPath: fileURLToPath(new URL('./present.overlay.yml', import.meta.url)),
       agentPresets: { roots: [], default: 'ptc' }, compareReplaySession: true,
       ...(MODE === 'record' ? {} : { replayFixture: FIXTURE }),

From a4cd2f57a0499fa684cf493c896d33cee26f310e Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:07:32 +0800
Subject: [PATCH 39/62] fix: keep file action feedback visible while hovering
 delivery cards

---
 .../src/client/Deliverables.module.css                |  4 ++--
 .../ui-deliverables/src/client/Deliverables.tsx       |  2 +-
 .../ui-deliverables/src/client/PresentedFileCard.tsx  |  2 +-
 packages/client/ui-open-in-app/src/client/index.ts    | 11 +++--------
 snapshots/web/present/ui.expected.md                  |  8 ++++----
 5 files changed, 11 insertions(+), 16 deletions(-)

diff --git a/packages/client/ui-deliverables/src/client/Deliverables.module.css b/packages/client/ui-deliverables/src/client/Deliverables.module.css
index eac1f29ea4..edd1cac863 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.module.css
+++ b/packages/client/ui-deliverables/src/client/Deliverables.module.css
@@ -18,8 +18,8 @@
 .description { overflow: hidden; color: var(--dsw-alias-label-tertiary); font-size: 10px; font-weight: 400; line-height: 16px; text-overflow: ellipsis; white-space: nowrap; }
 .description[data-error='true'] { color: var(--dsw-alias-state-error-primary); }
 .previewHint { display: none; }
-.file:hover .secondaryText { display: none; }
-.file:hover .previewHint { display: inline; }
+.file:hover .description:not([role='status']) .secondaryText { display: none; }
+.file:hover .description:not([role='status']) .previewHint { display: inline; }
 .toggle { align-self: center; display: inline-flex; align-items: center; gap: 4px; min-width: 0; padding: 1px 11px; border: 0; border-radius: 8px; background: transparent; color: var(--dsw-alias-label-tertiary); cursor: pointer; font: inherit; font-size: 12px; line-height: 18px; }
 .toggle:hover { background: var(--dsw-alias-interactive-bg-hover); }
 .toggle svg { flex: none; width: 14px; height: 14px; }
diff --git a/packages/client/ui-deliverables/src/client/Deliverables.tsx b/packages/client/ui-deliverables/src/client/Deliverables.tsx
index fa6c167b1e..3fae39bd01 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.tsx
+++ b/packages/client/ui-deliverables/src/client/Deliverables.tsx
@@ -57,7 +57,7 @@ export function DeliverablesTail(props: PropsRuntime<'conversation.chat.turnTail
 
 /**
  * Render the changed-files card, once the Host has served the announced
- * summary and it lists a file, and default-application buttons for declared
+ * summary and it lists a file, and shared native opening controls for declared
  * files. A summary the Host no longer serves leaves no card.
  * @param props - matched announcement and files, workspace opener, and localized copy.
  * @returns the closing turn's file rows.
diff --git a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
index 03ed7e411c..97008ceced 100644
--- a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
+++ b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
@@ -1,4 +1,4 @@
-/** File identity and explicit default-app or file-manager actions for one delivery. */
+/** File identity, Sidebar preview, and contributed native actions for one delivery. */
 import type { ReactNode } from 'react'
 import { resolveWorkspacePath } from '@deepseek-ai/dsh-util-workspace-path'
 import { FileTypeIcon, fileExtension } from '@deepseek-ai/dsh-client-ui-primitives'
diff --git a/packages/client/ui-open-in-app/src/client/index.ts b/packages/client/ui-open-in-app/src/client/index.ts
index c92aff20f5..7c28ccce1a 100644
--- a/packages/client/ui-open-in-app/src/client/index.ts
+++ b/packages/client/ui-open-in-app/src/client/index.ts
@@ -1,12 +1,7 @@
 /**
- * Browser half of open-in-app: one Session-header split button opening the
- * session's workspace directory (the summary's `cwd`) in the remembered
- * installed application, and the document preview's default-application
- * controls opening one previewed file. Application availability arrives once
- * per page from the host apps route and the last choice persists in the
- * browser through the controller's persisted snapshot store; desktop
- * availability for file paths arrives once per page from the Session Remote,
- * which also runs the open and reveal gestures.
+ * Shared native opening controls for workspace directories, document previews,
+ * delivery cards, and changed-file review. Directory choices persist in the browser;
+ * file defaults and application lists come from the serving Host desktop.
  */
 
 import type { Context as ClientContext } from '@deepseek-ai/cordis'
diff --git a/snapshots/web/present/ui.expected.md b/snapshots/web/present/ui.expected.md
index ad3780520c..a3c254300f 100644
--- a/snapshots/web/present/ui.expected.md
+++ b/snapshots/web/present/ui.expected.md
@@ -38,13 +38,13 @@
 - button "Preview report.txt in sidebar"
 - text: report.txt
 - status: Opened in default app
-- button "Open report.txt in sidebar": Open
-- button "More file actions for report.txt"
+- button "Open in Test Editor"
+- button "More ways to open"
 - button "Preview 说明.txt in sidebar"
 - text: 说明.txt
 - status: Opened in default app
-- button "Open 说明.txt in sidebar": Open
-- button "More file actions for 说明.txt"
+- button "Open in Test Editor"
+- button "More ways to open"
 - button "Copy"
 - button "Good response"
 - button "Bad response"

From c1ee42cd9cbaabdeddf39df1d429db2f5c606e84 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 14:28:15 +0800
Subject: [PATCH 40/62] fix: portal file action tooltips outside clipped cards

---
 apps/web/tests/present.e2e.ts                 | 12 +++++++
 .../src/client/OpenTargetButton.tsx           |  2 +-
 .../client/ui-primitives/README.i18n.yaml     |  4 +--
 packages/client/ui-primitives/README.md       |  2 +-
 packages/client/ui-primitives/README.zh.md    |  2 +-
 .../ui-primitives/src/Tooltip.module.css      |  2 ++
 packages/client/ui-primitives/src/Tooltip.tsx | 36 ++++++++++---------
 .../tests/tooltip.client.spec.tsx             | 15 ++++++++
 8 files changed, 54 insertions(+), 21 deletions(-)

diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index fb23c2db8e..4df8bfae81 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -132,6 +132,18 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       await row.waitFor()
       await expect.poll(() => row.getByRole('button', { name: 'More ways to open' }).count()).toBe(2)
       expect(await row.getByText('report.txt', { exact: true }).innerText()).toBe('report.txt')
+      const card = row.locator('[data-presented-file]').filter({ hasText: 'report.txt' })
+      await card.getByRole('button', { name: 'Open in Test Editor', exact: true }).hover()
+      await page.getByRole('tooltip', { name: 'Open in Test Editor', exact: true }).waitFor()
+      expect(await page.getByRole('tooltip').evaluate((tooltip) => {
+        const rect = tooltip.getBoundingClientRect()
+        const previous = tooltip.style.pointerEvents
+        tooltip.style.pointerEvents = 'auto'
+        const visible = document.elementFromPoint(rect.left + rect.width / 2, rect.bottom - 1) === tooltip
+        tooltip.style.pointerEvents = previous
+        return tooltip.parentElement === document.body && visible
+      })).toBe(true)
+      await page.mouse.move(0, 0)
       const beforePreview = (await opened()).length
       const column = page.locator('[data-rightbar-col]')
       for (const [name, content] of [['report.txt', 'EDITED_REPORT'], ['说明.txt', 'EDITED_NOTE']] as const) {
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index e9284d9293..8cc56c74e5 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -113,7 +113,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         anchor={(
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
             data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
-            <Tooltip label={primaryLabel} side="bottom" delayMs={500}>
+            <Tooltip portal label={primaryLabel} side="bottom" delayMs={500}>
               <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
                 data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
                 data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
diff --git a/packages/client/ui-primitives/README.i18n.yaml b/packages/client/ui-primitives/README.i18n.yaml
index 8d8279ffea..63f085ac64 100644
--- a/packages/client/ui-primitives/README.i18n.yaml
+++ b/packages/client/ui-primitives/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-primitives/README.md
-README.md: 4bc5d53f1fde5ac65015ef023134b163b351797f
-README.zh.md: 481a84150f480c87568a91af0311a3d4fcf2c637
+README.md: 5ea78f223e848effb566605eefa7be75c3a3ba9b
+README.zh.md: 78cc45d60b8642b41bc33bd1ed0c9a1d7bf78cdf
diff --git a/packages/client/ui-primitives/README.md b/packages/client/ui-primitives/README.md
index 4bc5d53f1f..5ea78f223e 100644
--- a/packages/client/ui-primitives/README.md
+++ b/packages/client/ui-primitives/README.md
@@ -49,7 +49,7 @@ Check this table before writing a control in a feature package. A plugin cannot
 | `Modal` | Centered dialog over a page mask. |
 | `RiskConfirmation` | Sensitive action gated behind an explicit checkbox. |
 | `OnboardingSurface` | First-run stage that holds the application root inert. |
-| `Tooltip` | Hover text on a cloned anchor, placed right, bottom, or top. |
+| `Tooltip` | Hover text anchored to a cloned child; optional `portal` rendering escapes clipping containers. |
 | `HoverCard` | Hover preview the pointer can rest on and select from; optional copy button. |
 | `Toast` | Transient top-center banner held for the owner's `holdMs`. |
 | `JsonTree`, `JsonBlock` | Read-only JSON inspection. |
diff --git a/packages/client/ui-primitives/README.zh.md b/packages/client/ui-primitives/README.zh.md
index 481a84150f..78cc45d60b 100644
--- a/packages/client/ui-primitives/README.zh.md
+++ b/packages/client/ui-primitives/README.zh.md
@@ -49,7 +49,7 @@ kind: "package-library"
 | `Modal` | 页面遮罩之上的居中对话框。 |
 | `RiskConfirmation` | 以显式复选框把关的敏感操作确认。 |
 | `OnboardingSurface` | 首次运行的引导舞台，期间保持应用根节点 inert。 |
-| `Tooltip` | 克隆锚点上的悬停文本，可置于右、下、上三个方向。 |
+| `Tooltip` | 锚定在克隆子元素上的悬停文本；可通过 `portal` 渲染到外层，避免被容器裁剪。 |
 | `HoverCard` | 指针可停留、可选中的悬停预览；可选带复制按钮。 |
 | `Toast` | 顶部居中的瞬时横幅，保持时长由所有者的 `holdMs` 决定。 |
 | `JsonTree`、`JsonBlock` | 只读 JSON 查看。 |
diff --git a/packages/client/ui-primitives/src/Tooltip.module.css b/packages/client/ui-primitives/src/Tooltip.module.css
index 926fb68557..ed546ce13c 100644
--- a/packages/client/ui-primitives/src/Tooltip.module.css
+++ b/packages/client/ui-primitives/src/Tooltip.module.css
@@ -19,6 +19,8 @@
   animation: tooltip-in 150ms var(--ds-ease-in-out);
 }
 
+.bubble[data-portal] { z-index: 1100; }
+
 .bubble[data-side='right'] {
   transform: translateY(-50%);
 }
diff --git a/packages/client/ui-primitives/src/Tooltip.tsx b/packages/client/ui-primitives/src/Tooltip.tsx
index 688a411fb9..0316840a25 100644
--- a/packages/client/ui-primitives/src/Tooltip.tsx
+++ b/packages/client/ui-primitives/src/Tooltip.tsx
@@ -1,8 +1,8 @@
-// Cloning the anchor preserves its layout context. Fixed positioning lets the
-// bubble escape ancestor overflow clipping without a portal.
+/** Anchor-preserving tooltips with optional body portals for clipping containers. */
 
 import { cloneElement, createContext, useCallback, useContext, useEffect, useLayoutEffect, useRef, useState } from 'react'
 import type { FocusEventHandler, MouseEventHandler, MutableRefObject, ReactElement, Ref } from 'react'
+import { createPortal } from 'react-dom'
 import css from './Tooltip.module.css'
 
 /** Bubble placement relative to the anchor. */
@@ -46,17 +46,18 @@ if (typeof window !== 'undefined') {
  * @param props.align - horizontal anchor-edge alignment for 'bottom'/'top' bubbles: 'end' pins
  * the bubble's right edge to the anchor's (for anchors beside other hover surfaces the centered
  * bubble would overlap); default 'center'. Ignored for side 'right'.
+ * @param props.portal - render the bubble under document.body to escape containing blocks and clipping ancestors.
  * @param props.delayMs - hover delay in milliseconds; keyboard focus remains immediate.
  * @param props.disabled - suppress the bubble while true; the anchor renders identically so
  * toggling never remounts it (which would cut its CSS transitions).
  * @param props.maxWidth - bubble width cap in pixels, for labels long enough that the default
  * half-viewport cap would render a slab wider than the surface the anchor sits on.
  * @param props.children - a single anchor element; its own ref (callback or object) is forwarded alongside the tooltip's.
- * @returns the cloned anchor plus a fixed-position bubble while hovered/focused; clicking the
+ * @returns the cloned anchor plus a fixed-position bubble, optionally portaled to the body; clicking the
  * anchor dismisses the bubble until the next trigger, and focus arriving after a pointer
  * interaction (a closing menu refocusing its trigger) never raises it.
  */
-export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0, disabled = false, maxWidth, children }: { label: TooltipLabel; side?: TooltipSide; align?: 'center' | 'end'; delayMs?: number; disabled?: boolean; maxWidth?: number; children: ReactElement<AnchorProps> }) {
+export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0, disabled = false, portal = false, maxWidth, children }: { label: TooltipLabel; side?: TooltipSide; align?: 'center' | 'end'; delayMs?: number; disabled?: boolean; portal?: boolean; maxWidth?: number; children: ReactElement<AnchorProps> }) {
   const anchor = useRef<HTMLElement | null>(null)
   // React 18 keeps the element's ref outside props; forward it so wrapping an
   // anchor in Tooltip never silently severs the owner's ref.
@@ -184,6 +185,20 @@ export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0,
     if (!triggers.current.hover && !triggers.current.focus) withdraw()
   }
 
+  const content = visible && !suppressed && (
+    <span
+      ref={bubble}
+      className={css.bubble}
+      data-side={placement}
+      data-portal={portal || undefined}
+      data-align={align}
+      style={{ left: pos.x, top: y, ...maxWidth === undefined ? {} : { maxWidth } }}
+      role="tooltip"
+    >
+      {resolvedLabel}
+    </span>
+  )
+
   return (
     <TooltipSuppression.Provider value={setSuppressed}>
       {cloneElement(children, {
@@ -197,18 +212,7 @@ export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0,
         onFocus: (e) => { children.props.onFocus?.(e); if (pointerModality) return; triggers.current.focus = true; cancelShow(); show() },
         onBlur: (e) => { children.props.onBlur?.(e); triggers.current.focus = false; hide() },
       })}
-      {visible && !suppressed && (
-        <span
-          ref={bubble}
-          className={css.bubble}
-          data-side={placement}
-          data-align={align}
-          style={{ left: pos.x, top: y, ...maxWidth === undefined ? {} : { maxWidth } }}
-          role="tooltip"
-        >
-          {resolvedLabel}
-        </span>
-      )}
+      {portal ? (content !== false && createPortal(content, document.body)) : content}
     </TooltipSuppression.Provider>
   )
 }
diff --git a/packages/client/ui-primitives/tests/tooltip.client.spec.tsx b/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
index 3f1c4f059c..5d6633c387 100644
--- a/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
+++ b/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
@@ -466,3 +466,18 @@ describe('Tooltip', () => {
     expect(screen.getByRole('tooltip').textContent).toBe('Open sidebar')
   })
 })
+
+
+it('keeps the anchor in its clipping container and portals only the tooltip', () => {
+  const view = render(<div style={{ overflow: 'hidden', contain: 'layout' }}>
+    <Tooltip portal label="Open in Music" side="bottom"><button type="button">File action</button></Tooltip>
+  </div>)
+  const anchor = screen.getByRole('button', { name: 'File action' })
+  fireEvent.mouseEnter(anchor)
+  const tooltip = screen.getByRole('tooltip')
+  expect(tooltip.parentElement).toBe(document.body)
+  expect(view.container.contains(anchor)).toBe(true)
+  expect(view.container.contains(tooltip)).toBe(false)
+  view.unmount()
+  expect(screen.queryByRole('tooltip')).toBeNull()
+})

From a4148d687fa5f30f1c0998af81fdaf9869fe8f41 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 16:46:58 +0800
Subject: [PATCH 41/62] fix: refine file action menus feedback and shared
 queries

---
 apps/web/tests/present.e2e.ts                 |   3 +-
 .../api/session-controller/README.i18n.yaml   |   4 +-
 packages/api/session-controller/README.md     |   2 +-
 packages/api/session-controller/README.zh.md  |   2 +-
 packages/api/session-controller/src/index.ts  |   3 +-
 .../session-open-workspace-path.host.spec.ts  |   6 +-
 .../client/ui-deliverables/README.i18n.yaml   |   4 +-
 packages/client/ui-deliverables/README.md     |   2 +-
 packages/client/ui-deliverables/README.zh.md  |   2 +-
 .../src/client/Deliverables.module.css        |   4 +
 .../src/client/PresentedFileCard.tsx          |  10 +-
 .../ui-deliverables/src/client/locales.ts     |   4 +-
 .../src/client/present-open.ts                |  23 +++-
 .../tests/present-open.client.spec.ts         |  40 ++++++-
 .../client/ui-open-in-app/README.i18n.yaml    |   4 +-
 packages/client/ui-open-in-app/README.md      |   4 +-
 packages/client/ui-open-in-app/README.zh.md   |   4 +-
 .../src/client/FileRouteAction.tsx            |   2 +-
 .../src/client/OpenTargetButton.module.css    |   2 +
 .../src/client/OpenTargetButton.tsx           |  26 +++--
 .../src/client/file-applications.ts           | 102 ++++++++++++------
 .../client/ui-open-in-app/src/client/index.ts |   3 +-
 .../tests/browser-plugin.client.spec.ts       |   1 +
 .../tests/file-applications.client.spec.tsx   |  53 +++++++++
 .../tests/open-in-app-action.client.spec.tsx  |   7 ++
 .../tests/open-path-action.client.spec.tsx    |  26 ++++-
 26 files changed, 267 insertions(+), 76 deletions(-)
 create mode 100644 packages/client/ui-open-in-app/tests/file-applications.client.spec.tsx

diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index 4df8bfae81..36d237857a 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -192,6 +192,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
     ])
     expect(exported).not.toContain('EDITED_REPORT')
     if (MODE !== 'record') {
+      await expect.poll(() => page.locator('[data-presented-file] [role="status"]').count(), { timeout: 10_000 }).toBe(0)
       const aria = await captureExpandedTurnProcessAria(page, '[class*="centerCol"]', scaffold.workspaceCwd)
       await compareOrRefreshGolden(join(DIR, 'ui.expected.md'), aria, MODE)
       await page.locator('[data-turn-process]').click()
@@ -233,7 +234,7 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
               .find(element => element.textContent === 'report.txt'),
           'report title',
         )
-        const description = requiredElement(report.querySelector<HTMLElement>('span[role="status"]'), 'report status')
+        const description = requiredElement(report.querySelector<HTMLElement>('[data-presented-description]'), 'report description')
         const open = requiredElement(
           report.querySelector<HTMLButtonElement>('[data-open-target] button'),
           'report open action',
diff --git a/packages/api/session-controller/README.i18n.yaml b/packages/api/session-controller/README.i18n.yaml
index e01ad4e71a..7909684664 100644
--- a/packages/api/session-controller/README.i18n.yaml
+++ b/packages/api/session-controller/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/api/session-controller/README.md
-README.md: fda32efcfd42bd88f28de0764ef8d2c0e6a4ff9f
-README.zh.md: 9eb60799088cb5cc9091352f38dfb50cfd6dbfd3
+README.md: 84734325be38099f0b5ff91026607029aaae7863
+README.zh.md: 41123ae048e1edda132901920222236364095842
diff --git a/packages/api/session-controller/README.md b/packages/api/session-controller/README.md
index fda32efcfd..84734325be 100644
--- a/packages/api/session-controller/README.md
+++ b/packages/api/session-controller/README.md
@@ -68,7 +68,7 @@ References keep local Session data, scoped Contexts, and history streams alive,
 
 `SessionMediaReferences` mounts `GET|HEAD /api/file?path=<absolute path>` on the authenticated `connection.fetch` channel when `connection`, `fs`, and `attachments` are composed. It reads ordinary files through `ctx.fs`, including temporary paths outside registered workspaces and files in remote providers. Neither directory containment nor MIME categories restrict access; `mime-types` supplies the response type, with `application/octet-stream` for unknown extensions. GET reuses `readBytes` for preflight and ongoing byte limits; HEAD reads metadata only. All files use `ctx.attachments.imageLimits.maxImageBytes` (normally 20 MiB); exceeding this limit returns 413. Responses contain the complete file, ignore Range, and carry `private, no-store`, `nosniff`, and a sandbox CSP so directly opened HTML/SVG cannot execute with the API origin. The Client rewrite lives in `ui-chat` (`AssistantMarkdown`); audio/video responses are available, while Markdown audio/video player nodes remain separate work.
 
-`workspacePathApplications({ path })` returns the serving desktop’s file handlers after the same filesystem mapping check used by `openWorkspacePath`. An optional `application` in the open request selects a currently registered handler without changing the system default. Application names, default selection, icons, and platform coverage come from [native-command](../../util/native-command/README.md). These operations do not activate an Agent or append Session events.
+`workspacePathApplications({ path })` returns the serving desktop’s file handlers after the same filesystem mapping check used by `openWorkspacePath`. An optional `application` in the open request selects a currently registered handler without changing the system default. Application names, default selection, icons, and platform coverage come from [native-command](../../util/native-command/README.md). These operations do not activate an Agent or append Session events. Native failures return bounded messages; original command errors remain Host-side causes.
 
 -----
 
diff --git a/packages/api/session-controller/README.zh.md b/packages/api/session-controller/README.zh.md
index 9eb6079908..41123ae048 100644
--- a/packages/api/session-controller/README.zh.md
+++ b/packages/api/session-controller/README.zh.md
@@ -68,7 +68,7 @@ Fork 复制 `atSeq` 所选的精确事件前缀，包含切点事件，允许在
 
 当 `connection`、`fs` 与 `attachments` 均被组合时，`SessionMediaReferences` 在鉴权 `connection.fetch` 通道上挂载 `GET|HEAD /api/file?path=<绝对路径>`。它通过 `ctx.fs` 读取普通文件，包括已注册工作区之外的临时路径与远程提供方中的文件。目录包含关系与 MIME 类别均不限制访问；`mime-types` 提供响应类型，未知扩展名使用 `application/octet-stream`。GET 复用 `readBytes` 执行读取前及读取中的字节限制；HEAD 只读取元数据。所有文件均使用 `ctx.attachments.imageLimits.maxImageBytes`（通常为 20 MiB）；超过此上限返回 413。响应包含完整文件，忽略 Range，并携带 `private, no-store`、`nosniff` 与沙箱 CSP，使直接打开的 HTML/SVG 无法以 API 源身份执行脚本。客户端重写位于 `ui-chat`（`AssistantMarkdown`）；音视频文件响应已可用，Markdown 音视频播放器节点仍是独立工作。
 
-`workspacePathApplications({ path })` 使用与 `openWorkspacePath` 相同的文件系统映射校验，返回服务端桌面上该文件的关联应用。打开请求中的可选 `application` 指定当前关联的应用，不修改系统默认应用。应用名称、默认项、图标和平台支持范围由 [native-command](../../util/native-command/README.zh.md) 提供。这些操作不激活 Agent，也不追加会话事件。
+`workspacePathApplications({ path })` 使用与 `openWorkspacePath` 相同的文件系统映射校验，返回服务端桌面上该文件的关联应用。打开请求中的可选 `application` 指定当前关联的应用，不修改系统默认应用。应用名称、默认项、图标和平台支持范围由 [native-command](../../util/native-command/README.zh.md) 提供。这些操作不激活 Agent，也不追加会话事件。原生操作失败时返回简短消息，原始命令异常作为 Host 端原因保留。
 
 -----
 
diff --git a/packages/api/session-controller/src/index.ts b/packages/api/session-controller/src/index.ts
index a9750a635f..9cab20852d 100644
--- a/packages/api/session-controller/src/index.ts
+++ b/packages/api/session-controller/src/index.ts
@@ -329,8 +329,9 @@ export class SessionController extends TypertRemoteService {
       if (error instanceof RemoteError) throw error
       throw new RemoteError(
         'gateway/internal',
-        `path open failed: ${error instanceof Error ? error.message : String(error)}`,
+        'path open failed',
         {},
+        { cause: error },
       )
     }
   }
diff --git a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
index 93f51c7ce3..e8216b5214 100644
--- a/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
+++ b/packages/api/session-controller/tests/session-open-workspace-path.host.spec.ts
@@ -101,7 +101,7 @@ describe('session/openWorkspacePath', () => {
   it('preserves native opener failure and cancellation results', async () => {
     const ctx = await context()
     const openPath = vi.fn((_path: string, _signal: AbortSignal) =>
-      Promise.reject(new Error('desktop unavailable')))
+      Promise.reject(new Error('Command failed: powershell.exe -EncodedCommand private-script-text')))
     const remote = createSessionTestRemote(ctx, {
       defaultModelSelection: () => ({ provider: 'p', model: 'm' }),
       cwd: '/default',
@@ -111,7 +111,7 @@ describe('session/openWorkspacePath', () => {
     await expect(remote.openWorkspacePath({ path: 'result.html' }))
       .resolves.toMatchObject({
         ok: false,
-        error: { code: 'gateway/internal', message: 'path open failed: desktop unavailable' },
+        error: { code: 'gateway/internal', message: 'path open failed' },
       })
 
     const aborted = new AbortController()
@@ -140,7 +140,7 @@ describe('session/openWorkspacePath', () => {
     await expect(controller.openWorkspacePath({
       path: 'second.html',
     }, new AbortController().signal)).rejects.toMatchObject({
-      code: 'gateway/internal', message: 'path open failed: desktop unavailable',
+      code: 'gateway/internal', message: 'path open failed',
     })
   })
 })
diff --git a/packages/client/ui-deliverables/README.i18n.yaml b/packages/client/ui-deliverables/README.i18n.yaml
index 85892e110d..c3c62898a1 100644
--- a/packages/client/ui-deliverables/README.i18n.yaml
+++ b/packages/client/ui-deliverables/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-deliverables/README.md
-README.md: a8e80ede3380cef7e0550a0a63aa195642ed4e12
-README.zh.md: 929ab7f93f6ff995586bd850b655eb2e7a31ac93
+README.md: ce006783310c257957bc8cfddcfd18226972d18f
+README.zh.md: 82239ba169f4ada188e8a5ba8e1889c61b336f96
diff --git a/packages/client/ui-deliverables/README.md b/packages/client/ui-deliverables/README.md
index a8e80ede33..ce00678331 100644
--- a/packages/client/ui-deliverables/README.md
+++ b/packages/client/ui-deliverables/README.md
@@ -32,7 +32,7 @@ Mount this plugin alongside `ui-conversation` and the Host [workspace-changes](.
 
 The Web `standard`, `ptc`, and `cordis` presets expose `present` for final files accessible through the Session filesystem, including files created through Bash. Call it with `files: [{ path, description? }]` after creating the files. The [present tool](../../deliverables/tool-present/README.md) owns file-count limits and Session declarations. A single delivery fills the row; multiple deliveries form a two-column grid, collapsed after four files. Cards show the basename, description or file type, and a shared native opening control. Clicking the card previews the file in the right Sidebar. The control opens the default application and lists associated applications, with file reveal last. Matching inline-code references also open Sidebar previews. Duplicate declarations use the last description before the closing reply.
 
-The `present` tool row retains its document icon and recorded result across progress, success, failure, and interruption. Native actions share pending state and publish progress or retryable errors on the card. Desktop metadata is loaded when cards mount and invalidated on connection replacement. Without a Host desktop, cards retain Sidebar preview but omit native controls; failed metadata reads offer Retry. Delivery cards and change review expose `deliverables.file.actions` and `deliverables.review.file.actions`, supplied by [ui-open-in-app](../ui-open-in-app/README.md). Association GET requests and native POST actions both validate the recorded file coordinates and Session filesystem mapping before using the Host desktop.
+The `present` tool row retains its document icon and recorded result across progress, success, failure, and interruption. Native actions share pending state and publish progress or retryable errors on the card. Successful open or reveal feedback stays visible for five seconds, fades over 200ms, then restores the file description; failures remain visible until another attempt. Desktop metadata is loaded when cards mount and invalidated on connection replacement. Without a Host desktop, cards retain Sidebar preview but omit native controls; failed metadata reads offer Retry. Delivery cards and change review expose `deliverables.file.actions` and `deliverables.review.file.actions`, supplied by [ui-open-in-app](../ui-open-in-app/README.md). Association GET requests and native POST actions both validate the recorded file coordinates and Session filesystem mapping before using the Host desktop.
 
 ### The changed-files card
 
diff --git a/packages/client/ui-deliverables/README.zh.md b/packages/client/ui-deliverables/README.zh.md
index 929ab7f93f..82239ba169 100644
--- a/packages/client/ui-deliverables/README.zh.md
+++ b/packages/client/ui-deliverables/README.zh.md
@@ -32,7 +32,7 @@ kind: "package-reference"
 
 Web 的 `standard`、`ptc` 与 `cordis` preset 提供 `present`，用于声明会话文件系统可访问的最终文件，包括通过 Bash 创建的文件。创建后以 `files: [{ path, description? }]` 调用。[present 工具](../../deliverables/tool-present/README.zh.md)拥有文件数量限制和会话声明。单个交付占满一行，多个交付使用双列网格，超过四个时默认收起。卡片显示文件名、说明或文件类型，以及共享的原生打开控件。点击卡片会在右侧 Sidebar 预览文件。控件打开默认应用，并列出关联应用，文件定位始终放在最后。匹配的行内代码引用也打开 Sidebar 预览。重复声明使用收尾回复之前最近一次的说明。
 
-`present` 工具行在执行、成功、失败和中断状态下保留文档图标及记录的结果。原生操作共享等待状态，并在卡片显示进度或可重试错误。卡片挂载时读取桌面信息，连接更换时清除缓存。Host 没有桌面时，卡片保留 Sidebar 预览并隐藏原生控件；元数据读取失败时提供重试。交付卡片和变更对比页通过 `deliverables.file.actions` 和 `deliverables.review.file.actions` 使用 [ui-open-in-app](../ui-open-in-app/README.zh.md) 提供的控件。关联应用 GET 查询与原生 POST 操作都会先校验记录中的文件坐标及会话文件系统映射，再调用 Host 桌面。
+`present` 工具行在执行、成功、失败和中断状态下保留文档图标及记录的结果。原生操作共享等待状态，并在卡片显示进度或可重试错误。打开或定位成功的反馈显示五秒后，在 200ms 内淡出并恢复文件说明；失败信息保留到下次尝试。卡片挂载时读取桌面信息，连接更换时清除缓存。Host 没有桌面时，卡片保留 Sidebar 预览并隐藏原生控件；元数据读取失败时提供重试。交付卡片和变更对比页通过 `deliverables.file.actions` 和 `deliverables.review.file.actions` 使用 [ui-open-in-app](../ui-open-in-app/README.zh.md) 提供的控件。关联应用 GET 查询与原生 POST 操作都会先校验记录中的文件坐标及会话文件系统映射，再调用 Host 桌面。
 
 ### 改动文件卡片
 
diff --git a/packages/client/ui-deliverables/src/client/Deliverables.module.css b/packages/client/ui-deliverables/src/client/Deliverables.module.css
index edd1cac863..0194aaf183 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.module.css
+++ b/packages/client/ui-deliverables/src/client/Deliverables.module.css
@@ -26,3 +26,7 @@
 @container (max-width: 620px) { .presented { grid-template-columns: minmax(0, 1fr); } }
 @media (pointer: coarse) { .split { min-height: 44px; } .open, .chevron { min-width: 44px; } }
 .actions { display: inline-flex; flex: none; pointer-events: auto; }
+
+.secondaryText[data-success] { animation-name: success-fade; animation-timing-function: ease-out; animation-fill-mode: forwards; }
+@keyframes success-fade { to { opacity: 0; } }
+@media (prefers-reduced-motion: reduce) { .secondaryText[data-success] { animation-name: none; } }
diff --git a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
index 97008ceced..f0dd26035b 100644
--- a/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
+++ b/packages/client/ui-deliverables/src/client/PresentedFileCard.tsx
@@ -4,7 +4,7 @@ import { resolveWorkspacePath } from '@deepseek-ai/dsh-util-workspace-path'
 import { FileTypeIcon, fileExtension } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { PropsLocale } from '@deepseek-ai/dsh-client-ui-slots'
 import type { PresentedHost } from '../presented.ts'
-import type { PresentedOpenPhase } from './present-open.ts'
+import { PRESENTED_SUCCESS_HOLD_MS, PRESENTED_SUCCESS_FADE_MS, type PresentedOpenPhase } from './present-open.ts'
 import { basename, type PresentedPath } from './turn-deliverables.ts'
 import type { NS } from './locales.ts'
 import css from './Deliverables.module.css'
@@ -27,6 +27,7 @@ export function PresentedFileCard({ file, cwd, phase, host, onPreview, actions,
   onPreview: () => void
   actions: ReactNode
 } & PropsLocale<typeof NS>) {
+  const succeeded = phase === 'opened' || phase === 'revealed'
   const reveal = host?.fileManager ?? 'directory'
   const name = basename(file.path)
   const metadata = fileExtension(name).toUpperCase() || t('presented.file')
@@ -42,9 +43,12 @@ export function PresentedFileCard({ file, cwd, phase, host, onPreview, actions,
     <div className={css.fileBody}>
       <div className={css.details}>
         <span className={css.fileName}>{name}</span>
-        <span className={css.description} role={phase === undefined ? undefined : 'status'}
+        <span className={css.description} data-presented-description role={phase === undefined ? undefined : 'status'}
           data-error={phase === 'error' || phase === 'revealError' || phase === 'nativeUnavailable' ? true : undefined}>
-          <span className={css.secondaryText}>{status}</span>
+          <span className={css.secondaryText} data-success={succeeded || undefined}
+            style={succeeded ? { animationDelay: `${PRESENTED_SUCCESS_HOLD_MS}ms`, animationDuration: `${PRESENTED_SUCCESS_FADE_MS}ms` } : undefined}>
+            {status}
+          </span>
           <span className={css.previewHint}>{t('presented.preview')}</span>
         </span>
       </div>
diff --git a/packages/client/ui-deliverables/src/client/locales.ts b/packages/client/ui-deliverables/src/client/locales.ts
index 4ed0595bc3..69e976fa06 100644
--- a/packages/client/ui-deliverables/src/client/locales.ts
+++ b/packages/client/ui-deliverables/src/client/locales.ts
@@ -23,7 +23,7 @@ export const zh = {
   'presented.collapse': '收起',
   'presented.collapseAria': '收起交付文件列表',
   'presented.opening': '正在打开…',
-  'presented.opened': '已在默认程序中打开',
+  'presented.opened': '已请求打开',
   'presented.error': '打开失败，点击重试',
   'presented.file': '文件',
   'row.title': '交付文件',
@@ -85,7 +85,7 @@ export const en: Record<DeliverablesKey, string> = {
   'presented.collapse': 'Collapse',
   'presented.collapseAria': 'Collapse delivered files',
   'presented.opening': 'Opening…',
-  'presented.opened': 'Opened in default app',
+  'presented.opened': 'Open requested',
   'presented.error': 'Could not open. Click to retry.',
   'presented.file': 'File',
   'row.title': 'Present files',
diff --git a/packages/client/ui-deliverables/src/client/present-open.ts b/packages/client/ui-deliverables/src/client/present-open.ts
index 92764884ef..fae3c3557a 100644
--- a/packages/client/ui-deliverables/src/client/present-open.ts
+++ b/packages/client/ui-deliverables/src/client/present-open.ts
@@ -4,6 +4,11 @@ import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import { changedFileUrl } from '../changes.ts'
 import { presentedFileUrl, PRESENT_HOST_ROUTE, isPresentedHost, type PresentedAction, type PresentedHost } from '../presented.ts'
 
+/** Success feedback remains fully visible for five seconds before fading. */
+export const PRESENTED_SUCCESS_HOLD_MS = 5000
+/** Fade interval shared by the card animation and status expiry. */
+export const PRESENTED_SUCCESS_FADE_MS = 200
+
 /** Failure feedback for the shared native opening control. */
 export type PresentedOpenFailure = 'openError' | 'revealError' | null
 
@@ -16,6 +21,7 @@ export class PresentedOpenController {
   readonly state = createSnapshotStore<Record<string, PresentedOpenPhase | undefined>>({})
   /** Native destination metadata, or a retryable read failure. */
   readonly host = createSnapshotStore<PresentedHost | 'error' | null>(null)
+  private readonly expiry = new Map<string, ReturnType<typeof setTimeout>>()
   private loading: Promise<void> | undefined
   private metadata = new AbortController()
   private readonly lifetime = new AbortController()
@@ -55,6 +61,7 @@ export class PresentedOpenController {
   private async openUrl(url: string, action: PresentedAction, application?: string): Promise<PresentedOpenFailure> {
     const phase = this.state.getSnapshot()[url]
     if (this.lifetime.signal.aborted || phase === 'opening' || phase === 'revealing') return null
+    this.clearExpiry(url)
     this.state.update((state) => { state[url] = action === 'open' ? 'opening' : 'revealing' })
     const task = this.request(url, action, application)
     this.pending.add(task)
@@ -110,9 +117,15 @@ export class PresentedOpenController {
   /** Cancel outstanding requests and wait until no request can publish state. */
   async dispose(): Promise<void> {
     this.lifetime.abort()
+    for (const url of this.expiry.keys()) this.clearExpiry(url)
     await Promise.all(this.pending)
   }
 
+  private clearExpiry(url: string): void {
+    clearTimeout(this.expiry.get(url))
+    this.expiry.delete(url)
+  }
+
   private async request(url: string, action: PresentedAction, application?: string): Promise<PresentedOpenFailure> {
     const failure = action === 'open' ? 'error' : 'revealError'
     let phase: PresentedOpenPhase = action === 'open' ? 'opened' : 'revealed'
@@ -125,7 +138,15 @@ export class PresentedOpenController {
       // Transport failures share the retryable card state with Host open failures.
       phase = failure
     }
-    if (!this.lifetime.signal.aborted) this.state.update((state) => { state[url] = phase })
+    if (!this.lifetime.signal.aborted) {
+      this.state.update((state) => { state[url] = phase })
+      if (phase === 'opened' || phase === 'revealed') {
+        this.expiry.set(url, setTimeout(() => {
+          this.expiry.delete(url)
+          this.state.update((state) => { Reflect.deleteProperty(state, url) })
+        }, PRESENTED_SUCCESS_HOLD_MS + PRESENTED_SUCCESS_FADE_MS))
+      }
+    }
     return phase === 'opened' || phase === 'revealed' ? null : action === 'reveal' ? 'revealError' : 'openError'
   }
 }
diff --git a/packages/client/ui-deliverables/tests/present-open.client.spec.ts b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
index 468e065ad4..dea83c354e 100644
--- a/packages/client/ui-deliverables/tests/present-open.client.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
@@ -3,7 +3,7 @@ import { afterEach, expect, it, vi } from 'vitest'
 import { SessionId } from '@deepseek-ai/dsh-session/types'
 import { PresentedOpenController } from '../src/client/present-open.ts'
 
-afterEach(() => { vi.unstubAllGlobals() })
+afterEach(() => { vi.unstubAllGlobals(); vi.useRealTimers() })
 
 const id = SessionId('fork')
 const url = 'api/present.open?sessionId=fork&seq=2&index=1'
@@ -184,3 +184,41 @@ it('encodes an explicit application identifier without changing the file coordin
   expect(fetcher).toHaveBeenCalledWith(`${url}&application=%2FApps%2FA%26B.app`, { method: 'POST', signal: expect.any(AbortSignal) as AbortSignal })
   await controller.dispose()
 })
+
+
+it.each(['open', 'reveal'] as const)('expires successful %s feedback after five seconds and its fade', async (action) => {
+  vi.useFakeTimers()
+  vi.stubGlobal('fetch', vi.fn(async () => new Response(null, { status: 204 })))
+  const controller = new PresentedOpenController()
+  await controller.open(id, 2, 1, action)
+  await vi.advanceTimersByTimeAsync(5000)
+  expect(controller.state.getSnapshot()[url]).toBe(action === 'open' ? 'opened' : 'revealed')
+  await vi.advanceTimersByTimeAsync(200)
+  expect(controller.state.getSnapshot()[url]).toBeUndefined()
+  await controller.dispose()
+})
+
+it('cancels an earlier success expiry when the next action fails', async () => {
+  vi.useFakeTimers()
+  const fetcher = vi.fn().mockResolvedValueOnce(new Response(null, { status: 204 }))
+    .mockResolvedValueOnce(new Response(null, { status: 500 }))
+  vi.stubGlobal('fetch', fetcher)
+  const controller = new PresentedOpenController()
+  await controller.open(id, 2, 1)
+  await vi.advanceTimersByTimeAsync(4000)
+  await controller.open(id, 2, 1)
+  await vi.advanceTimersByTimeAsync(6000)
+  expect(controller.state.getSnapshot()[url]).toBe('error')
+  await controller.dispose()
+})
+
+it('cancels success expiry when its controller is disposed', async () => {
+  vi.useFakeTimers()
+  vi.stubGlobal('fetch', vi.fn(async () => new Response(null, { status: 204 })))
+  const controller = new PresentedOpenController()
+  await controller.open(id, 2, 1)
+  const state = controller.state.getSnapshot()
+  await controller.dispose()
+  await vi.advanceTimersByTimeAsync(6000)
+  expect(controller.state.getSnapshot()).toBe(state)
+})
diff --git a/packages/client/ui-open-in-app/README.i18n.yaml b/packages/client/ui-open-in-app/README.i18n.yaml
index 977cb96683..b0fa75db3e 100644
--- a/packages/client/ui-open-in-app/README.i18n.yaml
+++ b/packages/client/ui-open-in-app/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-open-in-app/README.md
-README.md: 7840efdf1bb092cd538865f2b9b74b0911cfb06f
-README.zh.md: 0774e5228551b8463de129f49be2ac30f05f1273
+README.md: 138be128c291fc4a0611295c54768a95f33f3ae1
+README.zh.md: b81f62f9dbf8ccfbc1822b8a72df95e7169228c0
diff --git a/packages/client/ui-open-in-app/README.md b/packages/client/ui-open-in-app/README.md
index 7840efdf1b..138be128c2 100644
--- a/packages/client/ui-open-in-app/README.md
+++ b/packages/client/ui-open-in-app/README.md
@@ -31,9 +31,9 @@ Mount this plugin in the Web composition beside [`dsh-host-open-in-app`](../../h
 
 The Session header and document header use the same 24px-high split button with 9px corners. Both headers show only the icon; their tooltip names the default application or the reveal action. Both show the default action’s icon, mark its application with “(default)” in the menu, disable while their own gesture runs, and report failures through a transient toast. The directory adapter uses the existing cross-platform application catalog and remembers the last successful choice in `dsh.open-in-app.choice`; a missing choice falls back to the first available application.
 
-File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” always stays last. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
+File menus list the discovered associated applications without a separate “Open in default app” row. “Show file location” stays in a fixed footer separated from the scrolling applications. A successful query with only one available action renders a single button without a dropdown. Initial file-association loading uses a gray skeleton icon. When no default application is identified, that row reads “Show file location (default)” and the main button reveals the file. Directory menus have no reveal row. Choosing a file application does not change the system default. An unpreviewable file uses the same menu in a 40px-high split button with an icon and action text; its label is “Open” or “Show file location” according to the default action.
 
-File associations refresh when the file changes or its menu opens; cancelled queries cannot replace another file’s results. A failed query displays a menu message and leaves reveal available as the default action. File-association discovery follows [native-command](../../util/native-command/README.md); an empty result, including a platform without a discovery adapter, uses the same reveal fallback without platform branches in the control.
+Mounted controls with the same association reader and file share one query and its results; opening either menu refreshes all of them. Releasing the last control cancels the query and discards its state. Cancelled queries cannot replace another file’s results. A failed query displays a menu message and leaves reveal available as the default action. File-association discovery follows [native-command](../../util/native-command/README.md); an empty result, including a platform without a discovery adapter, uses the same reveal fallback without platform branches in the control.
 
 -----
 
diff --git a/packages/client/ui-open-in-app/README.zh.md b/packages/client/ui-open-in-app/README.zh.md
index 0774e52285..b81f62f9db 100644
--- a/packages/client/ui-open-in-app/README.zh.md
+++ b/packages/client/ui-open-in-app/README.zh.md
@@ -31,9 +31,9 @@ kind: "package-reference"
 
 会话标题栏和文档标题栏共用同一个高 24px、圆角 9px 的分体按钮。两个标题栏都只显示图标，悬停提示显示默认应用名称或文件定位动作。两者都显示默认动作的图标，在菜单的默认应用后标注“（默认）”，仅在自己的操作执行期间禁用，并通过短暂提示报告失败。目录适配器使用已有的跨平台应用列表，将最后一次成功选择保存在 `dsh.open-in-app.choice` 中；原选择不可用时回退到第一个可用应用。
 
-文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”始终放在最后。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
+文件菜单列出已发现的关联应用，不单列“用默认应用打开”。“显示文件位置”固定在菜单底部，通过分隔线与滚动的应用列表分开。查询成功且只有一个可用操作时显示单按钮，不再显示下拉箭头。文件关联首次加载时使用灰色骨架图标。未识别到默认应用时，该项显示为“显示文件位置（默认）”，主按钮也执行文件定位。目录菜单不包含定位项。选择文件应用不修改系统默认应用。无法预览文件时，空态使用同一菜单，按钮增大到 40px 高并显示图标和动作文字；根据默认动作显示“打开”或“显示文件位置”。
 
-文件变化或打开菜单时会重新查询文件关联；已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，并以文件定位作为默认动作。文件关联查询的平台支持范围见 [native-command](../../util/native-command/README.zh.md)；查询结果为空时，包括平台尚无查询适配器的情况，控件统一使用定位动作，不按操作系统分支处理。
+使用同一查询函数和文件的已挂载控件共用查询与结果，打开任一菜单会刷新所有相关控件。最后一个控件释放后取消查询并清除状态。已取消的查询不会覆盖其他文件的结果。查询失败时菜单显示提示，并以文件定位作为默认动作。文件关联查询的平台支持范围见 [native-command](../../util/native-command/README.zh.md)；查询结果为空时，包括平台尚无查询适配器的情况，控件统一使用定位动作，不按操作系统分支处理。
 
 -----
 
diff --git a/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx b/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
index 287b4b3956..49c27245f1 100644
--- a/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
+++ b/packages/client/ui-open-in-app/src/client/FileRouteAction.tsx
@@ -30,7 +30,7 @@ export function FileRouteAction(
   if (!props.available) return null
   return <OpenTargetButton key={props.actionUrl} kind="file" applications={association.apps}
     defaultId={association.apps.find(app => app.default)?.id} failed={association.failed}
-    loading={association.loading || props.pending} refresh={association.refresh} t={props.t}
+    loading={association.loading} busy={props.pending} refresh={association.refresh} t={props.t}
     execute={async (operation) => {
       return props.onAction(operation.kind === 'reveal' ? 'reveal' : 'open', operation.kind === 'application' ? operation.id : undefined)
     }} />
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
index 89089a8c2a..44a66f59f2 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.module.css
@@ -76,3 +76,5 @@
 .split[data-size='large'] .chevron {
   padding: 8px 10px;
 }
+
+.skeleton { display: inline-block; flex: none; border-radius: 3px; background: var(--dsw-alias-interactive-bg-hover); }
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 8cc56c74e5..65306e4716 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -26,6 +26,7 @@ export interface OpenTargetButtonProps {
   readonly applications: readonly OpenTargetApplication[]
   readonly defaultId: string | undefined
   readonly failed: boolean
+  readonly busy?: boolean
   readonly loading?: boolean
   readonly prominent?: boolean
   readonly t: TranslateNS<typeof NS>
@@ -79,19 +80,22 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
   const [menuOpen, setMenuOpen] = useState(false)
   const { pending, toast, act } = useOpenTargetGesture(props.execute, t)
   const preferred = applications.find(app => app.id === defaultId)
-  const disabled = pending || props.loading === true
+  const disabled = pending || props.busy === true || props.loading === true
+  const hasMenu = props.loading === true || props.failed || applications.length + (kind === 'file' ? 1 : 0) > 1
   const revealDefault = kind === 'file' && preferred === undefined && props.loading !== true
   const primaryLabel = preferred === undefined ? t('path.reveal') : t('open.title', { app: preferred.name })
   const run = (operation: OpenTargetOperation): void => { setMenuOpen(false); act(operation) }
   const primary = (): void => { run({ kind: revealDefault ? 'reveal' : 'default' }) }
-  const icon = revealDefault
-    ? <IconFolderOpenOutlineRegular size={props.prominent ? 18 : 13} />
-    : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={props.prominent ? 18 : 13} />
+  const icon = props.loading === true && preferred === undefined
+    ? <span className={css.skeleton} data-open-target-skeleton aria-hidden="true" style={{ width: props.prominent ? 18 : 13, height: props.prominent ? 18 : 13 }} />
+    : revealDefault
+      ? <IconFolderOpenOutlineRegular size={props.prominent ? 18 : 13} />
+      : <ApplicationIcon key={preferred?.icon} source={preferred?.icon ?? null} size={props.prominent ? 18 : 13} />
   return (
     <>
       <Menu
         className={css.menuAnchor}
-        open={menuOpen && !disabled}
+        open={menuOpen && !disabled && hasMenu}
         autoFocus
         portal
         dense
@@ -104,11 +108,11 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
             label: app.id === defaultId ? t('path.appDefault', { app: app.name }) : app.name,
           })),
           ...(props.failed ? [{ id: 'unavailable', label: t('path.appsError'), disabled: true }] : []),
-          ...(kind === 'file' ? [{
-            id: 'reveal', icon: <IconFolderOpenOutlineRegular />,
-            label: revealDefault ? t('path.appDefault', { app: t('path.reveal') }) : t('path.reveal'),
-          }] : []),
         ]}
+        footer={kind === 'file' ? [{
+          id: 'reveal', icon: <IconFolderOpenOutlineRegular />,
+          label: revealDefault ? t('path.appDefault', { app: t('path.reveal') }) : t('path.reveal'),
+        }] : undefined}
         onSelect={(id) => { run(id === 'reveal' ? { kind: 'reveal' } : { kind: 'application', id: id.slice(4) }) }}
         anchor={(
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
@@ -120,7 +124,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
                 {icon}{(props.prominent) && (revealDefault ? t('path.reveal') : t('path.open'))}
               </button>
             </Tooltip>
-            <button
+            {hasMenu && <button
               type="button" className={css.chevron} disabled={disabled}
               aria-haspopup="menu" aria-expanded={menuOpen && !disabled} aria-label={t('path.more')}
               data-open-path-more={kind === 'file' && !props.prominent ? '' : undefined}
@@ -130,7 +134,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
               }}
             >
               <IconChevronDownOutlineRegular size={10} />
-            </button>
+            </button>}
           </div>
         )}
       />
diff --git a/packages/client/ui-open-in-app/src/client/file-applications.ts b/packages/client/ui-open-in-app/src/client/file-applications.ts
index b4f27e3340..b0ba0dbe63 100644
--- a/packages/client/ui-open-in-app/src/client/file-applications.ts
+++ b/packages/client/ui-open-in-app/src/client/file-applications.ts
@@ -1,37 +1,73 @@
-/** File association reads shared by path previews and authorized delivery routes. */
-import { useEffect, useState } from 'react'
+/** File association reads shared by mounted controls using the same reader and target. */
+import { useCallback, useSyncExternalStore } from 'react'
+import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
 
-/**
- * Refresh associations on target changes and explicit menu opening; discard cancelled reads.
- * @param target - path or authenticated route identifying the current file.
- * @param query - target-specific association reader.
- * @param enabled - whether a native desktop is available.
- * @returns metadata, initial loading state, failure state, and a refresh callback.
- */
-export function useFileApplications(
-  target: string,
-  query: (target: string, signal: AbortSignal) => Promise<readonly SessionWorkspacePathApplication[] | null>,
-  enabled: boolean,
-): { apps: readonly SessionWorkspacePathApplication[]; loading: boolean; failed: boolean; refresh: () => void } {
-  const [revision, setRevision] = useState(0)
-  const [association, setAssociation] = useState<{
-    target: string
-    apps: readonly SessionWorkspacePathApplication[] | null
-  } | null>(null)
-  useEffect(() => {
-    if (!enabled) return
-    const controller = new AbortController()
-    void query(target, controller.signal).then((apps) => {
-      if (!controller.signal.aborted) setAssociation({ target, apps })
-    })
-    return () => { controller.abort() }
-  }, [enabled, target, query, revision])
-  const apps = association?.target === target ? association.apps : null
-  return {
-    apps: apps ?? [],
-    loading: association?.target !== target,
-    failed: association?.target === target && apps === null,
-    refresh: () => { setRevision(value => value + 1) },
+type Query = (target: string, signal: AbortSignal) => Promise<readonly SessionWorkspacePathApplication[] | null>
+interface Result {
+  apps: readonly SessionWorkspacePathApplication[]
+  loading: boolean
+  failed: boolean
+}
+interface Entry {
+  state: SnapshotStore<Result>
+  users: number
+  controller: AbortController | null
+  refresh: () => void
+}
+const EMPTY: Result = { apps: [], loading: true, failed: false }
+const readers = new WeakMap<Query, Map<string, Entry>>()
+
+/** Each mounted consumer retains the query; the last release cancels and discards it. */
+function subscribe(query: Query, target: string, listener: () => void): () => void {
+  let targets = readers.get(query)
+  if (targets === undefined) { targets = new Map(); readers.set(query, targets) }
+  let entry = targets.get(target)
+  const initial = entry === undefined
+  if (entry === undefined) {
+    const created: Entry = {
+      state: createSnapshotStore<Result>(EMPTY), users: 0, controller: null,
+      refresh: () => {
+        created.controller?.abort()
+        const controller = new AbortController()
+        created.controller = controller
+        void query(target, controller.signal).then((apps) => {
+          if (!controller.signal.aborted) created.state.set({ apps: apps ?? [], loading: false, failed: apps === null })
+        })
+      },
+    }
+    entry = created
+    targets.set(target, entry)
+  }
+  const retained = entry
+  retained.users += 1
+  const release = retained.state.subscribe(listener)
+  if (initial) retained.refresh()
+  return () => {
+    release()
+    retained.users -= 1
+    if (retained.users === 0) {
+      retained.controller?.abort()
+      targets.delete(target)
+    }
   }
 }
+
+/**
+ * Share associations and refreshes across mounted controls for the same file and reader.
+ * @param target - path or authenticated route identifying the current file.
+ * @param query - stable reader scoped to the serving Host; failures resolve to null.
+ * @param enabled - whether a native desktop is available.
+ * @returns metadata, initial loading state, failure state, and a shared refresh callback.
+ */
+export function useFileApplications(
+  target: string, query: Query, enabled: boolean,
+): Result & { refresh: () => void } {
+  const retain = useCallback((listener: () => void) => enabled ? subscribe(query, target, listener) : () => {}, [enabled, query, target])
+  const snapshot = useCallback(
+    () => enabled ? readers.get(query)?.get(target)?.state.getSnapshot() ?? EMPTY : EMPTY, [enabled, query, target],
+  )
+  const state = useSyncExternalStore(retain, snapshot, () => EMPTY)
+  const refresh = useCallback(() => { readers.get(query)?.get(target)?.refresh() }, [query, target])
+  return { ...state, refresh }
+}
diff --git a/packages/client/ui-open-in-app/src/client/index.ts b/packages/client/ui-open-in-app/src/client/index.ts
index 7c28ccce1a..95f753b16f 100644
--- a/packages/client/ui-open-in-app/src/client/index.ts
+++ b/packages/client/ui-open-in-app/src/client/index.ts
@@ -61,11 +61,12 @@ export function apply(ctx: ClientContext): void {
       iconUrl: appId => `${OPEN_IN_APP_ICON_PREFIX_ROUTE}/${appId}`,
     }),
   }, OpenInAppAction))
+  const applications: OpenPathInjected['applications'] = (path, signal) => paths.applications(path, signal)
   const pathInjected = (): OpenPathInjected => ({
     hooks: { openInAppDesktop: paths.desktop },
     loadDesktop: () => paths.load(),
     openPath: (path, action, application) => paths.openPath(path, action, application),
-    applications: (path, signal) => paths.applications(path, signal),
+    applications,
   })
   ctx.slots.inject('sidebar.right.tab.document.actions', () => ctx.slots.register({
     name: 'sidebar.right.tab.document.actions',
diff --git a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
index 43ccf7df46..4c86980614 100644
--- a/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
+++ b/packages/client/ui-open-in-app/tests/browser-plugin.client.spec.ts
@@ -74,6 +74,7 @@ describe('open-in-app browser half', () => {
     const face = (header?.inject as unknown as () => OpenPathInjected)()
     const emptyFace = (empty?.inject as unknown as () => OpenPathInjected)()
     expect(emptyFace.hooks.openInAppDesktop).toBe(face.hooks.openInAppDesktop)
+    expect(emptyFace.applications).toBe(face.applications)
     expect(face.hooks.openInAppDesktop.getSnapshot()).toBeNull()
     await Promise.all([face.loadDesktop(), emptyFace.loadDesktop()])
     expect(remote.session.canOpenWorkspacePath).toHaveBeenCalledOnce()
diff --git a/packages/client/ui-open-in-app/tests/file-applications.client.spec.tsx b/packages/client/ui-open-in-app/tests/file-applications.client.spec.tsx
new file mode 100644
index 0000000000..273f78deed
--- /dev/null
+++ b/packages/client/ui-open-in-app/tests/file-applications.client.spec.tsx
@@ -0,0 +1,53 @@
+// @vitest-environment jsdom
+/** Shared association reads retain one native request until the last control leaves. */
+import { act, cleanup, renderHook } from '@testing-library/react'
+import { afterEach, expect, it, vi } from 'vitest'
+import type { SessionWorkspacePathApplication } from '@deepseek-ai/dsh-api-session-controller/types'
+import { useFileApplications } from '../src/client/file-applications.ts'
+
+afterEach(cleanup)
+const music = [{ id: 'music', name: 'Music', default: true, icon: null }]
+
+it('shares the initial read and publishes a menu refresh to both controls', async () => {
+  const query = vi.fn(async () => music)
+  const first = renderHook(() => useFileApplications('/file.mp3', query, true))
+  const second = renderHook(() => useFileApplications('/file.mp3', query, true))
+  await act(async () => {})
+  expect(query).toHaveBeenCalledOnce()
+  expect(first.result.current.apps).toBe(second.result.current.apps)
+  query.mockResolvedValueOnce([{ id: 'player', name: 'Player', default: true, icon: null }])
+  await act(async () => { second.result.current.refresh() })
+  expect(query).toHaveBeenCalledTimes(2)
+  expect(first.result.current.apps[0]?.id).toBe('player')
+  expect(second.result.current.apps).toBe(first.result.current.apps)
+})
+
+it('cancels only after the last consumer leaves and discards the released result', async () => {
+  const pending = Promise.withResolvers<readonly SessionWorkspacePathApplication[] | null>()
+  const query = vi.fn((_path: string, _signal: AbortSignal) => pending.promise)
+  const first = renderHook(() => useFileApplications('/file.mp3', query, true))
+  const second = renderHook(() => useFileApplications('/file.mp3', query, true))
+  const signal = query.mock.calls[0]![1]
+  first.unmount()
+  expect(signal.aborted).toBe(false)
+  second.unmount()
+  expect(signal.aborted).toBe(true)
+  await act(async () => { pending.resolve(music) })
+  const next = renderHook(() => useFileApplications('/file.mp3', query, true))
+  expect(query).toHaveBeenCalledTimes(2)
+  await act(async () => {})
+  expect(next.result.current.apps).toEqual(music)
+})
+
+it('keeps disabled controls out of the query and permits refresh only while retained', async () => {
+  const query = vi.fn(async () => music)
+  const view = renderHook(({ enabled }) => useFileApplications('/file.mp3', query, enabled), { initialProps: { enabled: false } })
+  act(() => { view.result.current.refresh() })
+  expect(query).not.toHaveBeenCalled()
+  view.rerender({ enabled: true })
+  await act(async () => {})
+  expect(view.result.current.apps).toEqual(music)
+  view.rerender({ enabled: false })
+  act(() => { view.result.current.refresh() })
+  expect(query).toHaveBeenCalledOnce()
+})
diff --git a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
index 71bb7912ee..82344240e1 100644
--- a/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-in-app-action.client.spec.tsx
@@ -140,3 +140,10 @@ describe('OpenInAppAction launching', () => {
     expect(await screen.findByText(t('open.title', { app: zh['app.finder'] }))).toBeTruthy()
   })
 })
+
+
+it('omits the dropdown when only one directory application is available', () => {
+  render(<OpenInAppAction {...bench({ apps: ['finder'], cwd: '/w' }).props} />)
+  expect(screen.getAllByRole('button')).toHaveLength(1)
+  expect(screen.queryByRole('button', { name: zh['path.more'] })).toBeNull()
+})
diff --git a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
index 1e20e3a7b1..0a4a13f090 100644
--- a/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
+++ b/packages/client/ui-open-in-app/tests/open-path-action.client.spec.tsx
@@ -200,10 +200,12 @@ it.each([{ apps: [] }, { apps: [{ id: '/Player.app', name: 'Player', default: fa
   const b = bench()
   render(<OpenPathAction {...b.props} applications={async () => apps} />)
   await act(async () => {})
-  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
-  expect(screen.getAllByRole('menuitem').at(-1)?.textContent).toBe('显示文件位置（默认）')
-  expect(screen.queryByText('用默认应用打开')).toBeNull()
-  fireEvent.keyDown(screen.getByRole('menu'), { key: 'Escape' })
+  if (apps.length > 0) {
+    await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+    expect(screen.getAllByRole('menuitem').at(-1)?.textContent).toBe('显示文件位置（默认）')
+    expect(screen.queryByText('用默认应用打开')).toBeNull()
+    fireEvent.keyDown(screen.getByRole('menu'), { key: 'Escape' })
+  } else expect(screen.queryByRole('button', { name: zh['path.more'] })).toBeNull()
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.reveal'] })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
 })
@@ -267,3 +269,19 @@ it('labels the prominent default action as reveal when no default application is
   await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.reveal'] })) })
   expect(b.openPath).toHaveBeenLastCalledWith(ABSOLUTE_PATH, 'reveal', undefined)
 })
+
+
+it('uses a skeleton while associations load and pins reveal outside the application list', async () => {
+  const b = bench()
+  const pending = Promise.withResolvers<readonly { id: string; name: string; default: boolean; icon: null }[]>()
+  const view = render(<OpenPathAction {...b.props} applications={() => pending.promise} />)
+  expect(view.container.querySelector('[data-open-target-skeleton]')).not.toBeNull()
+  expect(view.container.querySelector('[data-open-path-open] svg')).toBeNull()
+  await act(async () => { pending.resolve([{ id: 'music', name: 'Music', default: true, icon: null }]) })
+  expect(view.container.querySelector('[data-open-target-skeleton]')).toBeNull()
+  await act(async () => { fireEvent.click(screen.getByRole('button', { name: zh['path.more'] })) })
+  const menu = screen.getByRole('menu')
+  const reveal = screen.getByRole('menuitem', { name: zh['path.reveal'] })
+  expect(menu.firstElementChild?.contains(reveal)).toBe(false)
+  expect(menu.lastElementChild?.contains(reveal)).toBe(true)
+})

From c7a4fae8e5e81aae882e4becdc5a131535ec3b98 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 16:48:25 +0800
Subject: [PATCH 42/62] fix: complete shared menu types and remove obsolete
 button styles

---
 .../client/ui-deliverables/src/client/Deliverables.module.css   | 1 -
 packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx  | 2 +-
 packages/client/ui-open-in-app/src/client/file-applications.ts  | 2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/packages/client/ui-deliverables/src/client/Deliverables.module.css b/packages/client/ui-deliverables/src/client/Deliverables.module.css
index 0194aaf183..c59f619a02 100644
--- a/packages/client/ui-deliverables/src/client/Deliverables.module.css
+++ b/packages/client/ui-deliverables/src/client/Deliverables.module.css
@@ -24,7 +24,6 @@
 .toggle:hover { background: var(--dsw-alias-interactive-bg-hover); }
 .toggle svg { flex: none; width: 14px; height: 14px; }
 @container (max-width: 620px) { .presented { grid-template-columns: minmax(0, 1fr); } }
-@media (pointer: coarse) { .split { min-height: 44px; } .open, .chevron { min-width: 44px; } }
 .actions { display: inline-flex; flex: none; pointer-events: auto; }
 
 .secondaryText[data-success] { animation-name: success-fade; animation-timing-function: ease-out; animation-fill-mode: forwards; }
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index 65306e4716..93a3a34657 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -112,7 +112,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         footer={kind === 'file' ? [{
           id: 'reveal', icon: <IconFolderOpenOutlineRegular />,
           label: revealDefault ? t('path.appDefault', { app: t('path.reveal') }) : t('path.reveal'),
-        }] : undefined}
+        }] : []}
         onSelect={(id) => { run(id === 'reveal' ? { kind: 'reveal' } : { kind: 'application', id: id.slice(4) }) }}
         anchor={(
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
diff --git a/packages/client/ui-open-in-app/src/client/file-applications.ts b/packages/client/ui-open-in-app/src/client/file-applications.ts
index b0ba0dbe63..5b80c14575 100644
--- a/packages/client/ui-open-in-app/src/client/file-applications.ts
+++ b/packages/client/ui-open-in-app/src/client/file-applications.ts
@@ -67,7 +67,7 @@ export function useFileApplications(
   const snapshot = useCallback(
     () => enabled ? readers.get(query)?.get(target)?.state.getSnapshot() ?? EMPTY : EMPTY, [enabled, query, target],
   )
-  const state = useSyncExternalStore(retain, snapshot, () => EMPTY)
+  const state = useSyncExternalStore(retain, snapshot, snapshot)
   const refresh = useCallback(() => { readers.get(query)?.get(target)?.refresh() }, [query, target])
   return { ...state, refresh }
 }

From 086b64103f775ff649aacbf1c5a3710590823623 Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 16:51:58 +0800
Subject: [PATCH 43/62] test: verify transient feedback and single-action file
 controls

---
 .../ui-deliverables/src/client/present-open.ts  |  2 +-
 .../tests/present-open.client.spec.ts           | 17 +++++++++++++++++
 snapshots/web/present/ui.expected.md            |  6 ++----
 .../web/seeded-history/file-preview.expected.md |  1 -
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/packages/client/ui-deliverables/src/client/present-open.ts b/packages/client/ui-deliverables/src/client/present-open.ts
index fae3c3557a..c116de3a44 100644
--- a/packages/client/ui-deliverables/src/client/present-open.ts
+++ b/packages/client/ui-deliverables/src/client/present-open.ts
@@ -139,13 +139,13 @@ export class PresentedOpenController {
       phase = failure
     }
     if (!this.lifetime.signal.aborted) {
-      this.state.update((state) => { state[url] = phase })
       if (phase === 'opened' || phase === 'revealed') {
         this.expiry.set(url, setTimeout(() => {
           this.expiry.delete(url)
           this.state.update((state) => { Reflect.deleteProperty(state, url) })
         }, PRESENTED_SUCCESS_HOLD_MS + PRESENTED_SUCCESS_FADE_MS))
       }
+      this.state.update((state) => { state[url] = phase })
     }
     return phase === 'opened' || phase === 'revealed' ? null : action === 'reveal' ? 'revealError' : 'openError'
   }
diff --git a/packages/client/ui-deliverables/tests/present-open.client.spec.ts b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
index dea83c354e..f6910df3f9 100644
--- a/packages/client/ui-deliverables/tests/present-open.client.spec.ts
+++ b/packages/client/ui-deliverables/tests/present-open.client.spec.ts
@@ -222,3 +222,20 @@ it('cancels success expiry when its controller is disposed', async () => {
   await vi.advanceTimersByTimeAsync(6000)
   expect(controller.state.getSnapshot()).toBe(state)
 })
+
+
+it('owns the expiry before notifying subscribers that can dispose the controller', async () => {
+  vi.useFakeTimers()
+  vi.stubGlobal('fetch', vi.fn(async () => new Response(null, { status: 204 })))
+  const controller = new PresentedOpenController()
+  let disposal: Promise<void> | undefined
+  const release = controller.state.subscribe(() => {
+    if (controller.state.getSnapshot()[url] === 'opened') disposal = controller.dispose()
+  })
+  await controller.open(id, 2, 1)
+  await disposal
+  const state = controller.state.getSnapshot()
+  await vi.advanceTimersByTimeAsync(6000)
+  expect(controller.state.getSnapshot()).toBe(state)
+  release()
+})
diff --git a/snapshots/web/present/ui.expected.md b/snapshots/web/present/ui.expected.md
index a3c254300f..9eea213c7f 100644
--- a/snapshots/web/present/ui.expected.md
+++ b/snapshots/web/present/ui.expected.md
@@ -36,13 +36,11 @@
   - text: — no retries, no extra files.
 - paragraph: PRESENT_DONE
 - button "Preview report.txt in sidebar"
-- text: report.txt
-- status: Opened in default app
+- text: report.txt delivered report
 - button "Open in Test Editor"
 - button "More ways to open"
 - button "Preview 说明.txt in sidebar"
-- text: 说明.txt
-- status: Opened in default app
+- text: 说明.txt delivered note
 - button "Open in Test Editor"
 - button "More ways to open"
 - button "Copy"
diff --git a/snapshots/web/seeded-history/file-preview.expected.md b/snapshots/web/seeded-history/file-preview.expected.md
index d100691da1..64d5ce902f 100644
--- a/snapshots/web/seeded-history/file-preview.expected.md
+++ b/snapshots/web/seeded-history/file-preview.expected.md
@@ -2,5 +2,4 @@
 - button "Line wrap" [pressed]
 - button "Read the file again"
 - button "Show file location"
-- button "More ways to open"
 - text: alpha

From 7d002f7eff2f9db4a36ad4e675795e273b73e46b Mon Sep 17 00:00:00 2001
From: creatixchu <creatixchu@deepseek.com>
Date: Sun, 20 Sep 2026 17:17:40 +0800
Subject: [PATCH 44/62] test: compare Windows file identity and refresh
 delivery controls

---
 .../tests/file-applications-windows.spec.ts               | 5 +++--
 snapshots/web/changed-files-turn/ui.expected.md           | 8 --------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/packages/util/native-command/tests/file-applications-windows.spec.ts b/packages/util/native-command/tests/file-applications-windows.spec.ts
index 0d093881e7..9f009d0b91 100644
--- a/packages/util/native-command/tests/file-applications-windows.spec.ts
+++ b/packages/util/native-command/tests/file-applications-windows.spec.ts
@@ -1,6 +1,6 @@
 /** Real Windows Shell discovery and invocation with a private extension and a private executable. */
 import { randomUUID } from 'node:crypto'
-import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'
+import { mkdtemp, readFile, realpath, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { expect, it, vi, onTestFinished } from 'vitest'
@@ -96,7 +96,8 @@ $key.SetValue('${extension}', ''); $key.Dispose()
     try { opened = (await readFile(marker, 'utf8')).trim().split(/\r?\n/) } catch (_error) { return false }
     return true
   }, { timeout: task.timeout })
-  expect(opened[0]).toBe(path)
+  // Windows Shell can expand an 8.3 input path to its long spelling.
+  expect(await realpath(opened[0]!)).toBe(await realpath(path))
   const pid = Number(opened[1])
   expect(pid).toBeGreaterThan(0)
   phase = 'wait for fixture exit'
diff --git a/snapshots/web/changed-files-turn/ui.expected.md b/snapshots/web/changed-files-turn/ui.expected.md
index 197e8c92f5..fd99b116f5 100644
--- a/snapshots/web/changed-files-turn/ui.expected.md
+++ b/snapshots/web/changed-files-turn/ui.expected.md
@@ -81,20 +81,12 @@
 - text: 此主机没有可用的桌面，无法使用外部程序打开文件或文件夹；文件仍可在侧边栏预览
 - button "在侧边栏预览 intro.md"
 - text: intro.md 标题已改为「项目说明」
-- button "在侧边栏打开 intro.md": 打开
-- button "intro.md 的更多文件操作" [disabled]
 - button "在侧边栏预览 src/util.ts"
 - text: util.ts 新增 add 两数相加函数
-- button "在侧边栏打开 src/util.ts": 打开
-- button "src/util.ts 的更多文件操作" [disabled]
 - button "在侧边栏预览 app.local"
 - text: app.local 新增配置文件，内容 mode=demo
-- button "在侧边栏打开 app.local": 打开
-- button "app.local 的更多文件操作" [disabled]
 - button "在侧边栏预览 notes.txt"
 - text: notes.txt 末尾追加了 done 一行
-- button "在侧边栏打开 notes.txt": 打开
-- button "notes.txt 的更多文件操作" [disabled]
 - button "复制"
 - button "好的回答"
 - button "有问题的回答"

From bf712e1404246d0001eafb74384ad0c70d548ccc Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 00:53:57 +0800
Subject: [PATCH 45/62] feat(dockkit): add stable retained tab layout

---
 .../ui-dockkit/src/components/DockSurface.tsx |  27 ++-
 .../ui-dockkit/src/components/FloatLayer.tsx  |  96 ++++++-----
 .../ui-dockkit/src/components/TabLayout.tsx   | 155 ++++++++++++++++++
 .../ui-dockkit/src/components/TabPanel.tsx    |  65 ++++----
 .../src/components/dockkit.module.css         |  77 +++++++++
 .../ui-dockkit/src/components/pointer.ts      |   4 +
 packages/client/ui-dockkit/src/index.ts       |   2 +
 7 files changed, 354 insertions(+), 72 deletions(-)
 create mode 100644 packages/client/ui-dockkit/src/components/TabLayout.tsx

diff --git a/packages/client/ui-dockkit/src/components/DockSurface.tsx b/packages/client/ui-dockkit/src/components/DockSurface.tsx
index 6c3e0ced4d..17ca70f0c9 100644
--- a/packages/client/ui-dockkit/src/components/DockSurface.tsx
+++ b/packages/client/ui-dockkit/src/components/DockSurface.tsx
@@ -21,6 +21,7 @@ import {
 import { fitOf, measurePaneFits, paneElements, sameFits } from './measure.ts'
 import { useGesture } from './pointer.ts'
 import { PaneTree, type SizePreview } from './PaneTree.tsx'
+import { TabLayout, type TabRetention } from './TabLayout.tsx'
 import type { PaneCallbacks, SplitBlock } from './render.ts'
 import css from './dockkit.module.css'
 
@@ -161,10 +162,11 @@ function sameSizes(a: readonly number[], b: readonly number[]): boolean {
 }
 
 /** The split tree and the gestures over it. */
-export function DockSurface({
+function Surface({
   state, canSplit, canAddTab, canCloseTab, intents, labels, renderTab, renderTabTitle, renderTabMenuItems, chrome, onRoom,
+  draw,
   dropZones = 'edges', minPaneFraction = MIN_PANE_FRACTION, hideSplitWhenBlocked = false,
-}: DockSurfaceProps): ReactNode {
+}: DockSurfaceProps & { readonly draw: (callbacks: PaneCallbacks, preview: SizePreview | undefined) => ReactNode }): ReactNode {
   const surface = useRef<HTMLDivElement | null>(null)
   const [preview, setPreview] = useState<Preview>(NO_PREVIEW)
   const [fits, setFits] = useState(NO_FITS)
@@ -289,7 +291,26 @@ export function DockSurface({
 
   return (
     <div className={css.surface} ref={surface} data-dockkit-surface data-dockkit-drop-zones={dropZones}>
-      <PaneTree state={state} nodeId={state.rootId} callbacks={callbacks} preview={preview.sizes} />
+      {draw(callbacks, preview.sizes)}
     </div>
   )
 }
+
+/** Recursive docked layout; floating content is rendered separately by FloatLayer. */
+export function DockSurface(props: DockSurfaceProps): ReactNode {
+  return <Surface {...props} draw={(callbacks, preview) =>
+    <PaneTree state={props.state} nodeId={props.state.rootId} callbacks={callbacks} preview={preview} />} />
+}
+
+/** Horizontal Sidebar layout with stable tab containers across docking and floating. */
+export type DockLayoutProps = DockSurfaceProps & TabRetention
+
+/**
+ * Render one pane or two horizontal panes, and their floats, in one stable content tree.
+ * @param props - layout, gestures and lazy body-retention policy.
+ * @returns the layout; the containing ancestors must not clip or establish a fixed-position containing block.
+ */
+export function DockLayout(props: DockLayoutProps): ReactNode {
+  return <Surface {...props} draw={(callbacks, preview) =>
+    <TabLayout {...props} callbacks={callbacks} preview={preview} />} />
+}
diff --git a/packages/client/ui-dockkit/src/components/FloatLayer.tsx b/packages/client/ui-dockkit/src/components/FloatLayer.tsx
index a1efe4ce40..4253880f0b 100644
--- a/packages/client/ui-dockkit/src/components/FloatLayer.tsx
+++ b/packages/client/ui-dockkit/src/components/FloatLayer.tsx
@@ -18,7 +18,7 @@ import type { PointerEvent as ReactPointerEvent, ReactNode } from 'react'
 import clsx from 'clsx'
 import { IconCloseOutlineRegular, IconPanelLeftOutlineRegular, Tooltip } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { DockIntents, DockLabels, TabRenderer } from '../contract/adapter.ts'
-import type { FloatRect, LayoutState, PaneId, TabId } from '../contract/types.ts'
+import type { FloatRect, LayoutState, PaneId, TabId, TabRecord } from '../contract/types.ts'
 import { FLOAT_MIN_SIZE } from '../engine/constraints.ts'
 import { movedRect, resizedRect } from '../engine/geometry.ts'
 import { floatRect, getPane, getTab, onlyTabId } from '../engine/tree.ts'
@@ -65,8 +65,13 @@ function raised(state: LayoutState, paneId: PaneId): boolean {
   return state.activePaneId === paneId && state.floats.at(-1) === paneId
 }
 
-/** Every floating panel, in z order. */
-export function FloatLayer({ state, intents, labels, renderTab, renderTabTitle, canCloseTab }: FloatLayerProps): ReactNode {
+/**
+ * Shared move/resize gestures; changing layout mode never owns the content DOM.
+ * @param state - committed layout and float stacking order.
+ * @param intents - gesture settlements.
+ * @returns the current preview and focus/gesture callbacks.
+ */
+export function useFloatGestures(state: LayoutState, intents: DockIntents) {
   const [preview, setPreview] = useState<{ paneId: PaneId; rect: FloatRect } | undefined>(undefined)
   const begin = useGesture(() => { setPreview(undefined) })
 
@@ -93,6 +98,54 @@ export function FloatLayer({ state, intents, labels, renderTab, renderTabTitle,
     })
   }
 
+  return { preview, raise, drag }
+}
+
+/**
+ * Header-only controls, usable above either retained or visibility-mounted bodies.
+ * @param props - owning pane/tab, localized labels and gesture callbacks.
+ * @returns the float header without a content container.
+ */
+export function FloatHeader({ paneId, tab, labels, intents, renderTabTitle, canCloseTab, drag }: {
+  readonly paneId: PaneId
+  readonly tab: TabRecord
+  readonly labels: DockLabels
+  readonly intents: DockIntents
+  readonly renderTabTitle: TabRenderer | undefined
+  readonly canCloseTab: ((id: TabId) => boolean) | undefined
+  readonly drag: ReturnType<typeof useFloatGestures>['drag']
+}): ReactNode {
+  return (
+    <header className={clsx(css.tabStrip, css.floatHeader)} data-dockkit-float-grip={paneId}
+      onPointerDown={(event) => { drag('move', paneId, event) }}>
+      <div className={clsx(css.tab, css.floatTitle)} data-dockkit-float-title>
+        <TabTitle>{renderTabTitle?.(tab) ?? tab.title}</TabTitle>
+      </div>
+      <div className={css.stripFill} />
+      <Tooltip label={labels.dockFloat} side="bottom" delayMs={500}>
+        <button type="button" className={css.iconButton} aria-label={labels.dockFloat}
+          data-dockkit-float-dock={paneId} onPointerDown={event => { event.stopPropagation() }}
+          onClick={() => { intents.unfloatPane(paneId) }}>
+          <IconPanelLeftOutlineRegular className={css.dockGlyph} />
+        </button>
+      </Tooltip>
+      {(canCloseTab?.(tab.id) ?? true) && (
+        <Tooltip label={labels.closeFloat} side="bottom" delayMs={500}>
+          <button type="button" className={css.iconButton} aria-label={labels.closeFloat}
+            data-dockkit-float-close={paneId} onPointerDown={event => { event.stopPropagation() }}
+            onClick={() => { intents.closeTab(tab.id) }}>
+            <IconCloseOutlineRegular />
+          </button>
+        </Tooltip>
+      )}
+    </header>
+  )
+}
+
+/** Every floating panel, in z order. */
+export function FloatLayer({ state, intents, labels, renderTab, renderTabTitle, canCloseTab }: FloatLayerProps): ReactNode {
+  const { preview, raise, drag } = useFloatGestures(state, intents)
+
   return (
     <>
       {state.floats.map((paneId, depth) => {
@@ -117,42 +170,7 @@ export function FloatLayer({ state, intents, labels, renderTab, renderTabTitle,
             }}
             onPointerDown={() => { raise(paneId) }}
           >
-            <header
-              className={clsx(css.tabStrip, css.floatHeader)}
-              data-dockkit-float-grip={paneId}
-              onPointerDown={(event) => { drag('move', paneId, event) }}
-            >
-              <div className={clsx(css.tab, css.floatTitle)} data-dockkit-float-title>
-                <TabTitle>{renderTabTitle?.(tab) ?? tab.title}</TabTitle>
-              </div>
-              <div className={css.stripFill} />
-              <Tooltip label={labels.dockFloat} side="bottom" delayMs={500}>
-                <button
-                  type="button"
-                  className={css.iconButton}
-                  aria-label={labels.dockFloat}
-                  data-dockkit-float-dock={paneId}
-                  onPointerDown={(event) => { event.stopPropagation() }}
-                  onClick={() => { intents.unfloatPane(paneId) }}
-                >
-                  <IconPanelLeftOutlineRegular className={css.dockGlyph} />
-                </button>
-              </Tooltip>
-              {(canCloseTab?.(tab.id) ?? true) && (
-                <Tooltip label={labels.closeFloat} side="bottom" delayMs={500}>
-                  <button
-                    type="button"
-                    className={css.iconButton}
-                    aria-label={labels.closeFloat}
-                    data-dockkit-float-close={paneId}
-                    onPointerDown={(event) => { event.stopPropagation() }}
-                    onClick={() => { intents.closeTab(tab.id) }}
-                  >
-                    <IconCloseOutlineRegular />
-                  </button>
-                </Tooltip>
-              )}
-            </header>
+            <FloatHeader {...{ paneId, tab, labels, intents, renderTabTitle, canCloseTab, drag }} />
             <div className={css.floatBody}>{renderTab(tab)}</div>
             <div
               className={css.floatResize}
diff --git a/packages/client/ui-dockkit/src/components/TabLayout.tsx b/packages/client/ui-dockkit/src/components/TabLayout.tsx
new file mode 100644
index 0000000000..c88e206f04
--- /dev/null
+++ b/packages/client/ui-dockkit/src/components/TabLayout.tsx
@@ -0,0 +1,155 @@
+/** Stable tab siblings in one horizontal Grid, including viewport-positioned floats. */
+import { useEffect, useLayoutEffect, useRef, useState } from 'react'
+import type { MutableRefObject, ReactNode } from 'react'
+import clsx from 'clsx'
+import type { DockIntents } from '../contract/adapter.ts'
+import type { LayoutState, PaneNode, TabId, TabRecord } from '../contract/types.ts'
+import { findTabPane, floatRect, getNode, getPane } from '../engine/tree.ts'
+import type { SizePreview } from './PaneTree.tsx'
+import type { PaneCallbacks } from './render.ts'
+import { FloatHeader, useFloatGestures } from './FloatLayer.tsx'
+import { PaneDropHints, TabPanel, TabStrip } from './TabPanel.tsx'
+import css from './dockkit.module.css'
+
+/** Host policy for lazily retaining a tab body without reparenting it. */
+export interface TabRetention {
+  /** Whether a visited body survives hiding; omitted means visibility-mounted. */
+  readonly keepMounted?: (tab: TabRecord) => boolean
+  /** Whether this layout's Session is on screen; defaults to true. */
+  readonly active?: boolean
+}
+
+interface LayoutProps extends TabRetention {
+  readonly state: LayoutState
+  readonly callbacks: PaneCallbacks
+  readonly preview: SizePreview | undefined
+  readonly intents: DockIntents
+}
+
+interface TabHostProps extends LayoutProps {
+  readonly tab: TabRecord
+  readonly pane: PaneNode
+  readonly column: number
+  readonly floats: ReturnType<typeof useFloatGestures>
+  readonly focusRequest: MutableRefObject<{ readonly tabId: TabId; readonly origin: Element | null } | undefined>
+}
+
+/** A tab's ancestors stay identical across selection, pane moves and floating. */
+function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRequest, keepMounted, active = true }: TabHostProps): ReactNode {
+  const floating = pane.host === 'float'
+  const selected = floating || pane.activeTabId === tab.id
+  const visible = active && selected && (floating || state.expanded)
+  const retained = keepMounted?.(tab) ?? false
+  const [visited, setVisited] = useState(visible)
+  if (visible && !visited) setVisited(true)
+  const host = useRef<HTMLElement | null>(null)
+  const body = useRef<HTMLDivElement | null>(null)
+  useLayoutEffect(() => {
+    if (host.current !== null) host.current.inert = !visible
+    const focused = document.activeElement
+    if (!visible && focused instanceof HTMLElement && host.current?.contains(focused)) focused.blur()
+    const request = focusRequest.current
+    if (!visible || request?.tabId !== tab.id) return
+    focusRequest.current = undefined
+    // Preserve deliberate focus taken by another control or the newly shown body.
+    if (focused !== null && focused !== document.body && focused !== document.documentElement && focused !== request.origin) return
+    const strip = host.current?.querySelector('[data-dockkit-strip]')
+    const chip = [...strip?.querySelectorAll<HTMLElement>('[data-dockkit-tab]') ?? []]
+      .find(element => element.dataset.dockkitTab === tab.id)
+    chip?.focus({ preventScroll: true })
+  }, [visible, tab.id, focusRequest])
+  // Electron emits a non-bubbling focus event on the webview element.
+  useEffect(() => {
+    const element = body.current
+    if (element === null) return
+    const focus = (): void => {
+      if (!visible) return
+      if (floating) floats.raise(pane.id)
+      else if (state.activePaneId !== pane.id) callbacks.onFocusPane(pane.id)
+    }
+    element.addEventListener('focus', focus, true)
+    return () => { element.removeEventListener('focus', focus, true) }
+  }, [visible, floating, floats, pane.id, state.activePaneId, callbacks])
+  const lifted = floating && floats.preview?.paneId === pane.id ? floats.preview.rect : undefined
+  const rect = floating ? lifted ?? floatRect(pane) : undefined
+  const depth = lifted === undefined ? state.floats.indexOf(pane.id) + 1 : state.floats.length + 1
+  return (
+    <div className={clsx(css.tabCell, floating && css.floatingCell)} hidden={!selected}
+      data-dockkit-host={floating ? 'float' : 'dock'} data-dockkit-column={floating ? undefined : column}
+      style={{ gridColumn: floating ? 1 : column * 2 + 1, gridRow: 1, order: floating ? depth : 0 }}>
+    <section ref={host} className={clsx(css.tabHost, floating ? css.float : css.pane)}
+      aria-hidden={!visible || undefined}
+      data-dockkit-content={tab.id}
+      data-dockkit-pane={!floating && selected ? pane.id : undefined}
+      data-dockkit-pane-active={!floating && state.activePaneId === pane.id || undefined}
+      data-dockkit-float={floating ? pane.id : undefined}
+      data-dockkit-float-active={floating && state.activePaneId === pane.id || undefined}
+      data-dockkit-column={!floating ? column : undefined}
+      style={rect === undefined ? undefined : {
+        left: rect.x, top: rect.y, width: rect.width, height: rect.height,
+      }}
+      onPointerDown={() => { if (floating) floats.raise(pane.id) }}
+      onClick={() => { if (!floating && state.activePaneId !== pane.id) callbacks.onFocusPane(pane.id) }}>
+      <div className={css.tabHostHeader}>
+        {selected && (floating
+          ? <FloatHeader paneId={pane.id} tab={tab} labels={callbacks.labels} intents={intents}
+            renderTabTitle={callbacks.renderTabTitle} canCloseTab={callbacks.canCloseTab} drag={floats.drag} />
+          : <TabStrip state={state} pane={pane} callbacks={callbacks} />)}
+      </div>
+      <div ref={body} className={clsx(css.tabHostBody, floating ? css.floatBody : css.paneBody)}>
+        {visited && (retained || (active && selected)) ? callbacks.renderTab(tab) : null}
+        {!floating && <PaneDropHints pane={pane} callbacks={callbacks} />}
+      </div>
+      {floating && <div className={css.floatResize} data-dockkit-float-resize={pane.id}
+        onPointerDown={event => { floats.drag('resize', pane.id, event) }} />}
+    </section>
+    </div>
+  )
+}
+
+/**
+ * One or two horizontal panes; CSS resolves content sizes from track fractions.
+ * @param props - committed layout, gesture preview and body retention policy.
+ * @returns stable tab containers, including floating tabs.
+ * @throws if the docked tree is not one pane or two horizontal panes.
+ */
+export function TabLayout(props: LayoutProps): ReactNode {
+  const { state, callbacks, preview } = props
+  const focusRequest = useRef<{ readonly tabId: TabId; readonly origin: Element | null }>()
+  const tabCallbacks: PaneCallbacks = {
+    ...callbacks,
+    onFocusTab: tabId => {
+      // Only changing the selected body replaces its strip; pane-only focus does not.
+      focusRequest.current = findTabPane(state, tabId).activeTabId === tabId
+        ? undefined : { tabId, origin: document.activeElement }
+      callbacks.onFocusTab(tabId)
+    },
+  }
+  const root = getNode(state, state.rootId)
+  if (root.kind === 'split' && (root.axis !== 'row' || root.children.length !== 2)) {
+    throw new Error('DockLayout requires one pane or two horizontally split panes')
+  }
+  const panes = root.kind === 'pane' ? [root] : root.children.map(id => getPane(state, id))
+  const sizes = root.kind === 'split' ? preview?.splitId === root.id ? preview.sizes : root.sizes : [1]
+  const floats = useFloatGestures(state, props.intents)
+  const columns = sizes.map(size => `minmax(0, ${size}fr)`).join(' 0px ')
+  return (
+    <div className={css.tabLayout} data-dockkit-split={root.kind === 'split' ? root.id : undefined}
+      style={{ gridTemplateColumns: columns }}>
+      {/* Logical order changes must not make React move a connected webview's ancestor. */}
+      {Object.values(state.tabs).sort((a, b) => a.id.localeCompare(b.id)).map(tab => {
+        const pane = findTabPane(state, tab.id)
+        return <TabHost key={tab.id} {...props} callbacks={tabCallbacks} tab={tab} pane={pane}
+          column={panes.findIndex(candidate => candidate.id === pane.id)} floats={floats} focusRequest={focusRequest} />
+      })}
+      {panes.filter(pane => pane.tabs.length === 0).map(pane => (
+        <div key={pane.id} className={css.emptyTabHost} data-dockkit-empty style={{ gridColumn: panes.indexOf(pane) * 2 + 1, gridRow: 1 }}>
+          <TabPanel state={state} pane={pane} callbacks={callbacks} />
+        </div>
+      ))}
+      {root.kind === 'split' && <div className={clsx(css.divider, css.tabLayoutDivider)}
+        data-dockkit-divider={`${root.id}:0`} style={{ gridColumn: 2, gridRow: 1 }}
+        onPointerDown={event => { callbacks.onDividerPressed(root.id, 0, event) }} />}
+    </div>
+  )
+}
diff --git a/packages/client/ui-dockkit/src/components/TabPanel.tsx b/packages/client/ui-dockkit/src/components/TabPanel.tsx
index ae7d2e6fa7..9c31c43fbe 100644
--- a/packages/client/ui-dockkit/src/components/TabPanel.tsx
+++ b/packages/client/ui-dockkit/src/components/TabPanel.tsx
@@ -208,8 +208,8 @@ function splitBlockedTitle(labels: PaneCallbacks['labels'], block: SplitBlock):
   }
 }
 
-/** The pane's tab strip, split control, and body. */
-export function TabPanel({ state, pane, callbacks }: TabPanelProps): ReactNode {
+/** @param props - pane state and gestures. @returns its tab strip without a content container. */
+export function TabStrip({ state, pane, callbacks }: TabPanelProps): ReactNode {
   // The open context menu and the chip that opened it; the menu positions
   // itself against that chip from its portal.
   const [menu, setMenu] = useState<{ readonly tabId: TabId; readonly anchor: HTMLElement } | undefined>(undefined)
@@ -218,15 +218,11 @@ export function TabPanel({ state, pane, callbacks }: TabPanelProps): ReactNode {
   const stripTabs = useRef<HTMLDivElement | null>(null)
   useStripScrollFades(stripTabs, pane.tabs)
   useActiveChipInView(stripTabs, chips, pane.tabs, pane.activeTabId)
-  const active = pane.activeTabId === undefined ? undefined : getTab(state, pane.activeTabId)
   const block = callbacks.splitBlock(pane.id)
   const target = callbacks.dropTarget
   const stripIndex = target !== undefined && target.kind === 'strip' && target.paneId === pane.id
     ? target.index
     : undefined
-  const zone = target !== undefined && target.kind === 'zone' && target.paneId === pane.id
-    ? target.zone
-    : undefined
 
   /** Select a tab from a click or a key, unless it is the active pane's selected tab already: that changes nothing. */
   const activate = (tabId: TabId): void => {
@@ -242,19 +238,6 @@ export function TabPanel({ state, pane, callbacks }: TabPanelProps): ReactNode {
   }
 
   return (
-    <section
-      className={css.pane}
-      data-dockkit-pane={pane.id}
-      data-dockkit-pane-active={state.activePaneId === pane.id || undefined}
-      // A click on the pane's body or strip focuses the pane, unless it is the
-      // active one already: that click changes nothing and records nothing. The
-      // chips and the strip's controls stop their own clicks: each reports one
-      // intent, and that intent already decides which pane is active.
-      onClick={() => {
-        if (state.activePaneId === pane.id) return
-        callbacks.onFocusPane(pane.id)
-      }}
-    >
       <div className={css.tabStrip} role="tablist" data-dockkit-strip={pane.id}>
         <div ref={stripTabs} className={css.stripTabs} role="presentation" data-dockkit-strip-tabs={pane.id}>
           {pane.tabs.map((tabId, index) => {
@@ -407,21 +390,43 @@ export function TabPanel({ state, pane, callbacks }: TabPanelProps): ReactNode {
           </div>
         )}
       </div>
+  )
+}
+
+/** @param props - target pane and drag preview. @returns body-local drop feedback, or nothing. */
+export function PaneDropHints({ pane, callbacks }: Pick<TabPanelProps, 'pane' | 'callbacks'>): ReactNode {
+  const target = callbacks.dropTarget
+  const zone = target?.kind === 'zone' && target.paneId === pane.id ? target.zone : undefined
+  if (zone === undefined) return null
+  return <>
+    <div className={css.dockScrim} data-dockkit-dock-scrim />
+    {callbacks.horizontalDrops && zone !== 'center'
+      ? <>
+        <DockHint zone="left" active={zone === 'left'} labels={callbacks.labels} />
+        <DockHint zone="right" active={zone === 'right'} labels={callbacks.labels} />
+      </>
+      : <DockHint zone={zone} active labels={callbacks.labels} />}
+  </>
+}
+
+/** @param props - pane state and gestures. @returns one pane in the recursive, visibility-mounted layout. */
+export function TabPanel({ state, pane, callbacks }: TabPanelProps): ReactNode {
+  const active = pane.activeTabId === undefined ? undefined : getTab(state, pane.activeTabId)
+  return (
+    <section
+      className={css.pane}
+      data-dockkit-pane={pane.id}
+      data-dockkit-pane-active={state.activePaneId === pane.id || undefined}
+      onClick={() => {
+        if (state.activePaneId !== pane.id) callbacks.onFocusPane(pane.id)
+      }}
+    >
+      <TabStrip state={state} pane={pane} callbacks={callbacks} />
       <div className={css.paneBody}>
         {active === undefined
           ? <p className={css.empty}>{callbacks.labels.emptyPane}</p>
           : callbacks.renderTab(active)}
-        {zone !== undefined && (
-          <>
-            <div className={css.dockScrim} data-dockkit-dock-scrim />
-            {callbacks.horizontalDrops && zone !== 'center'
-              ? <>
-                <DockHint zone="left" active={zone === 'left'} labels={callbacks.labels} />
-                <DockHint zone="right" active={zone === 'right'} labels={callbacks.labels} />
-              </>
-              : <DockHint zone={zone} active labels={callbacks.labels} />}
-          </>
-        )}
+        <PaneDropHints pane={pane} callbacks={callbacks} />
       </div>
     </section>
   )
diff --git a/packages/client/ui-dockkit/src/components/dockkit.module.css b/packages/client/ui-dockkit/src/components/dockkit.module.css
index fab875c5b6..fd24348a10 100644
--- a/packages/client/ui-dockkit/src/components/dockkit.module.css
+++ b/packages/client/ui-dockkit/src/components/dockkit.module.css
@@ -129,6 +129,82 @@
   min-height: 0;
 }
 
+/* Every tab remains a sibling. Explicit tracks determine placement; order only
+   changes painting, so raising a float never moves a connected DOM ancestor. */
+.tabLayout {
+  display: grid;
+  flex: 1 1 auto;
+  grid-template-rows: minmax(0, 1fr);
+  min-width: 0;
+  min-height: 0;
+}
+
+.tabCell,
+.emptyTabHost {
+  display: flex;
+  min-width: 0;
+  min-height: 0;
+  z-index: var(--dsh-dockkit-dock-layer, 10);
+}
+
+.tabCell[hidden] {
+  display: none;
+}
+
+/* A zero-sized Grid item supplies a stacking context, not a containing block
+   for its fixed child. Floats share one layer and use Grid paint order within it. */
+.floatingCell {
+  width: 0;
+  height: 0;
+  z-index: var(--dsh-dockkit-float-layer, 60);
+}
+
+.tabHost {
+  min-width: 0;
+  min-height: 0;
+  pointer-events: auto;
+}
+
+.tabHost:not(.float),
+.emptyTabHost {
+  background: var(--dsw-alias-bg-base);
+}
+
+.tabCell[data-dockkit-host='dock'][data-dockkit-column='0'] > .tabHost {
+  border-left: 0.5px solid var(--dsw-alias-border-l4);
+}
+
+.tabHostHeader {
+  flex: none;
+}
+
+.tabHostBody {
+  position: relative;
+  min-width: 0;
+}
+
+.tabLayoutDivider {
+  width: 0;
+  cursor: col-resize;
+  z-index: calc(var(--dsh-dockkit-dock-layer, 10) + 1);
+  pointer-events: auto;
+}
+
+.tabLayoutDivider::before {
+  top: 0;
+  bottom: 0;
+  left: -0.25px;
+  width: 0.5px;
+}
+
+.tabLayoutDivider::after {
+  top: 0;
+  bottom: 0;
+  left: -4px;
+  right: -4px;
+  background: linear-gradient(to bottom, transparent, var(--dsw-alias-label-caption) 50%, transparent) center / 1px 100% no-repeat;
+}
+
 /* A body that overflows scrolls inside its pane; nothing escapes the pane. */
 .pane {
   display: flex;
@@ -234,6 +310,7 @@
 :global(html[data-platform='darwin']) .stripTabs,
 :global(html[data-platform='darwin']) .stripChrome,
 :global(html[data-platform='darwin']) .paneBody,
+:global(html[data-platform='darwin']) .float,
 :global(html[data-platform='darwin']) .divider {
   -webkit-app-region: no-drag;
 }
diff --git a/packages/client/ui-dockkit/src/components/pointer.ts b/packages/client/ui-dockkit/src/components/pointer.ts
index a3b368ea9b..bd2f136bf4 100644
--- a/packages/client/ui-dockkit/src/components/pointer.ts
+++ b/packages/client/ui-dockkit/src/components/pointer.ts
@@ -40,6 +40,10 @@ export function followPointer(element: HTMLElement, pointerId: number, followers
   capturePointer(element, pointerId)
   const controller = new AbortController()
   const { signal } = controller
+  element.dataset.dockkitPointer = String(pointerId)
+  signal.addEventListener('abort', () => {
+    if (element.dataset.dockkitPointer === String(pointerId)) delete element.dataset.dockkitPointer
+  }, { once: true })
   const own = (event: PointerEvent): boolean => event.pointerId === pointerId
   window.addEventListener('pointermove', (event) => { if (own(event)) followers.move(event) }, { signal })
   window.addEventListener('pointerup', (event) => {
diff --git a/packages/client/ui-dockkit/src/index.ts b/packages/client/ui-dockkit/src/index.ts
index f72adb9271..0632f84fe5 100644
--- a/packages/client/ui-dockkit/src/index.ts
+++ b/packages/client/ui-dockkit/src/index.ts
@@ -66,3 +66,5 @@ export { DockSurface } from './components/DockSurface.tsx'
 export type { DockSurfaceProps } from './components/DockSurface.tsx'
 export { FloatLayer } from './components/FloatLayer.tsx'
 export type { FloatLayerProps } from './components/FloatLayer.tsx'
+export { DockLayout } from './components/DockSurface.tsx'
+export type { DockLayoutProps } from './components/DockSurface.tsx'

From 96b2aca346bbef31ab7f7ab5835e5b79e3592cb5 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 00:54:24 +0800
Subject: [PATCH 46/62] feat(sidebar): retain session views across tab
 presentation changes

---
 ...9-20-sidebar-retained-tab-layout.i18n.yaml |  6 ++
 .../2026-09-20-sidebar-retained-tab-layout.md | 83 ++++++++++++++++
 ...26-09-20-sidebar-retained-tab-layout.zh.md | 83 ++++++++++++++++
 ...t-sidebar-docking-infrastructure.i18n.yaml |  4 +-
 ...04-right-sidebar-docking-infrastructure.md |  6 +-
 ...right-sidebar-docking-infrastructure.zh.md |  6 +-
 .../src/client/contract/slots.ts              |  4 +-
 .../ui-sidebar-right/src/client/index.ts      | 20 +++-
 .../src/client/session-view.ts                | 86 ++++++++++++++++
 .../src/client/session-views.ts               | 90 +++++++++++++++++
 .../src/client/shell/RightbarRoot.tsx         | 44 ++++++---
 .../src/client/shell/SidebarRight.module.css  | 78 +++++++--------
 .../src/client/shell/SidebarRight.tsx         | 99 ++++++++-----------
 .../ui-sidebar-right/src/client/tab-info.ts   |  7 +-
 .../src/client/tab-registry.ts                |  2 +
 15 files changed, 493 insertions(+), 125 deletions(-)
 create mode 100644 .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
 create mode 100644 .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
 create mode 100644 .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
 create mode 100644 packages/client/ui-sidebar-right/src/client/session-view.ts
 create mode 100644 packages/client/ui-sidebar-right/src/client/session-views.ts

diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
new file mode 100644
index 0000000000..657f035be9
--- /dev/null
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
+2026-09-20-sidebar-retained-tab-layout.md: ed5404009d6d8844c54aef224eac2dd238dc7a4c
+2026-09-20-sidebar-retained-tab-layout.zh.md: 0539dee38c9b2b9ecc1f5e9b8d1608dd9b5ea518
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
new file mode 100644
index 0000000000..ed5404009d
--- /dev/null
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
@@ -0,0 +1,83 @@
+# Agent Note: Stable Sidebar tab mounting and Session retention
+
+Status: implemented
+
+English | [中文](2026-09-20-sidebar-retained-tab-layout.zh.md)
+
+## Problem
+
+Restoring Session-specific tab records and URLs does not preserve a live browsing context. The recursive docked renderer mounts only an active body, a separate floating portal creates another body, and changing a Session binding remounts Session-scoped slots. Electron 44's `WebViewElement.disconnectedCallback` detaches and resets its guest, so preserving a React key or caching an element reference cannot compensate for disconnected ancestors.
+
+The first [Desktop Browser implementation](../feature/2026-09-20-desktop-browser-webview.md) keeps its guest under a fixed body-level parent and follows a placeholder with RAF measurements. User trials report working float, collapse and Session switches with that implementation; this change replaces its geometry mechanism, not a demonstrated failure of those interactions. Real parent layout must own content size, clipping and overlap.
+
+## Decision
+
+Sidebar owns live-body retention, independently of Browser navigation and Workspace storage. A retained page's DOM ancestors remain connected and unchanged during Session switches, tab selection, pane moves, collapse, floating and docking back. Browser Presentation attaches directly inside its content container and performs no placeholder measurement or overlay positioning.
+
+### Layout ownership
+
+- `DockLayout` renders the Sidebar's one or two horizontal panes with stable tab siblings. The existing recursive `DockSurface` and separate `FloatLayer` remain available for general split-tree rendering; the layout engine and serialized format are unchanged.
+- Every tab has a stable Grid cell, frame, Header container and Body container. Explicit Grid columns determine docking placement; Flex assigns Header and Body height. Floating changes that same frame to `position: fixed` without changing its parent or replacing Body.
+- A floating frame's zero-sized Grid cell establishes a stacking context at the float layer. CSS `order` expresses float depth within that layer; DOM order stays sorted by tab identity. Raising many floats cannot increment their layer past menus. Selection and strip order never reorder the content-node list.
+- Common ancestors have no transform, clipping or enclosing stacking context. Docked cells own collapse transforms and visibility; each frame clips its content. Fullscreen changes the same root's width and docked layer. Existing window-drag region pulses remain, but no RAF copies content positions.
+- Split and float gestures retain their existing measurements and operation state. These update user-selected split fractions and float rectangles, not a second Browser rectangle. Browser resize and content sizing use normal CSS layout.
+
+### Session and tab lifetime
+
+`SidebarRightTabDefinition.keepMounted` enables lazy retention for a type. Desktop Browser enables it; other types keep visibility-based body mounting. A retained body is first created on display, then survives hiding until its occurrence or provider lifetime ends. The policy is not persisted and does not select a storage partition.
+
+`SidebarSessionView` acquires and releases one `SessionReference` using the independent `sidebarView` source, and owns its committed-mount count and retained-Body holds. `SidebarSessionViews` manages selection, retention policy and view indexes; it delegates lifetime operations to the view rather than mutating its counts or releasing its reference. `RightbarRoot` receives `SidebarSessionViewSnapshot` values and the existing injected callbacks, not resource-owner objects. It renders each through its own explicit `SessionProvider`, with a stable Session key; the renderer's general Session-remount semantics remain unchanged.
+
+Tabs contribute Body-retention holds rather than independent Session references. Those holds follow the existing occurrence signal, including a new signal after close-and-undo; the view does not create a second tab lifetime. A retired view stays in the collection's reference index until its own disposal removes it, so plugin shutdown can also reach views whose React mounts have not finished.
+
+Only the selected Session reports frame occupancy or binds public Sidebar navigation. Background tab actions still address their own adopted store. `tab.visible` includes Session and global-panel visibility; floating does not make a background Session visible. A Session change or global panel hides its whole content tree, while Sidebar collapse hides only docked cells and leaves foreground floats visible. Hidden content is inaccessible to pointer and keyboard input, and hidden body focus is blurred.
+
+A background Session with no initialized retained body leaves the view list. Its reference releases after its committed React root unmounts, avoiding scope disposal underneath a mounted subtree. Plugin disposal releases all references, including retired views awaiting unmount. The Sidebar plugin depends on `sessions` and `uiSession`, so Cordis unloads it when either dependency ends; `ui-session` owns binding invalidation. Views do not register disposal callbacks on the shared Session Context. Catalog absence alone is not treated as deletion. Unvisited Browser tabs and unrelated Sessions are not eagerly opened.
+
+### Provider responsibilities
+
+`BrowserFrame` remains navigation and observable page state. Presentation creates and attaches the carrier DOM, without pane, clipping or stacking knowledge. Electron's provider receives physical attach/detach callbacks: hiding retained content emits neither, while an actual unmount cancels pending attachment and releases the guest. A subsequent physical mount recreates it from its known address. Disposal waits for pending creation and guest releases; an acquisition completing after cancellation is released rather than attached.
+
+The [Desktop Browser decision](../feature/2026-09-20-desktop-browser-webview.md) retains guest security, shared IPC declarations and Workspace partition ownership. Separate tabs and Sessions never share one page instance merely because they share a storage partition. Web remains disabled by default and retains its iframe carrier when explicitly enabled.
+
+### Retention versus recovery
+
+| Operation | Content handling |
+|---|---|
+| Switch tabs | Hide the old retained cell; display the target's existing body. |
+| Split, reorder or move to another pane | Change logical placement and Grid assignment, without moving Body. |
+| Float, dock back or raise | Change the same frame's CSS mode or cell paint order. |
+| Collapse Sidebar | Hide docked cells; foreground floats remain visible. |
+| Session A → B → A | Hide and reshow A's original tree instead of loading its saved URL. |
+| Close, provider unload or actual generation termination | Release the body and guest; undo creates a new occurrence. |
+| Application restart, window reload or guest crash | Use provider recovery or retry; page memory and native history are not durable. |
+
+[Layout and provider recovery](2026-09-14-sidebar-layout-provider-recovery.md) remains independent: persisted tab identity, placement and address support cold starts, not DOM serialization. A hidden page may continue scripts, media and networking.
+
+## Alternatives considered
+
+**Hide panes only.** Collapse works, but moving between panes or into another floating portal still changes content ancestors.
+
+**Retain bodies only in the foreground Session.** Session-slot remounting still disconnects the page and fails to preserve the existing Session-switch experience.
+
+**Give each tab its own Session reference.** A view's tabs share one `SessionProvider`, whose reference must exist before their bodies render. Per-view ownership covers that parent and its children without an additional reference lifecycle for each tab.
+
+**Cache and reparent DOM.** Ordinary reparenting invokes Electron disconnection. Atomic-move dependencies, private attachment APIs and lifecycle monkey-patches are not used.
+
+**Keep the fixed Browser overlay with event-driven measurement or CSS anchor positioning.** Content remains separate from the layout it imitates; the content itself must participate in Grid/Flex.
+
+**Use native popovers.** Top-layer elements cannot be covered by ordinary Portal content through `z-index`. Migrating menus and dialogs into another stacking system expands the work beyond Sidebar; the implementation preserves the existing Portal and layer model.
+
+**Raise floats by increasing their root z-index.** An unbounded float count can cross menu and modal layers. Equal-layer Grid cells with CSS paint order retain both stacking and DOM identity.
+
+**Save the URL and rebuild when hidden.** This cannot preserve forms, script state, scroll position or native history. It is recovery after loss, not live retention.
+
+## Consequences
+
+Layout correctness belongs to Sidebar/DockKit rather than Browser. The cost is stable content containers and explicit Session-reference ownership: background retention holds Session scopes and subscriptions as well as page memory. There is no implicit LRU or idle timeout; future reclamation requires an explicit suspension/recovery policy. Other tab types do not automatically acquire these costs.
+
+The change affects Sidebar chrome, float stacking, focus and platform styles, not just the Browser package. The owning [docking infrastructure](../feature/2026-09-04-right-sidebar-docking-infrastructure.md) and Desktop Browser notes remain active for their independent engine, navigation, storage and security decisions. Their separated-content presentation is superseded here; layout persistence and tab-type navigation remain applicable.
+
+## Verification
+
+Focused TypeScript compilation covers Sidebar, Browser and Desktop source. DockKit, Sidebar, Browser and Desktop bundles and the Web shell build complete. No tests or recordings were added or run, and the running Electron was not restarted. The stable-tree implementation still requires real Electron verification of guest identity, form and history retention, multi-float paint order, resizing, clipping, drop hints, focus and platform window controls. Compilation and bundling are not evidence that these runtime observations pass.
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
new file mode 100644
index 0000000000..0539dee38c
--- /dev/null
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
@@ -0,0 +1,83 @@
+# Agent Note: Sidebar 的稳定 Tab 挂载与会话保活
+
+Status: implemented
+
+[English](2026-09-20-sidebar-retained-tab-layout.md) | 中文
+
+## Problem
+
+恢复各会话的 Tab 记录和 URL，并不能保留活的浏览上下文。递归停靠渲染只挂载活动 Body，独立浮动 Portal 会创建另一个 Body，切换会话绑定还会重挂载会话级 slot。Electron 44 的 `WebViewElement.disconnectedCallback` 会 detach 并重置 guest，因此保持 React key 或缓存元素引用不能抵消祖先断开。
+
+首版 [Desktop Browser 实现](../feature/2026-09-20-desktop-browser-webview.zh.md)把 guest 留在 body 下的固定父节点中，通过 RAF 测量跟随占位元素。用户试用该实现时报告浮动、收起和切会话均可工作；本次替换的是其几何处理方式，并非这些交互已被证实存在故障。内容尺寸、裁剪与重叠必须由真实父节点布局负责。
+
+## Decision
+
+Sidebar 负责活 Body 的保留，不依赖 Browser 导航和 Workspace 存储。保活页面的 DOM 祖先在切会话、选 Tab、跨 Pane 移动、收起、浮动和回停靠时保持连接与身份不变。Browser Presentation 直接挂载到内容容器内，不做占位元素测量或浮层定位。
+
+### 布局所有权
+
+- `DockLayout` 用稳定的 Tab 兄弟节点渲染 Sidebar 的一个或两个水平 Pane。现有递归 `DockSurface` 和独立 `FloatLayer` 仍可用于通用分割树渲染；布局引擎和序列化格式不变。
+- 每个 Tab 都有稳定的 Grid cell、frame、Header 容器和 Body 容器。显式 Grid 列决定停靠归属，Flex 分配 Header 与 Body 的高度。浮动只把同一个 frame 改为 `position: fixed`，不改父节点或替换 Body。
+- 浮动 frame 的零尺寸 Grid cell 在浮窗层建立层叠上下文。CSS `order` 表达该层内的浮窗深度，DOM 顺序始终按 Tab 身份排序。大量浮窗置顶不会把层级递增到菜单之上；选中项和 Tab 条排序均不重排内容节点列表。
+- 共同祖先不设置 transform、裁剪或包住全部内容的层叠上下文。停靠 cell 负责收起 transform 和显隐，各 frame 裁剪自身内容。Fullscreen 修改同一个根的宽度和停靠层级。窗口拖动区域的既有脉冲仍保留，但没有 RAF 复制内容位置。
+- 分栏与浮窗手势沿用原有测量和操作状态，更新用户选择的分栏比例与浮窗矩形，而非维护第二份 Browser 矩形。窗口缩放和内容尺寸变化由普通 CSS 布局处理。
+
+### 会话与 Tab 生命周期
+
+`SidebarRightTabDefinition.keepMounted` 为类型启用懒保活。Desktop Browser 启用它，其他类型继续按可见性挂载 Body。保活 Body 在首次显示时创建，随后隐藏不卸载，直到 occurrence 或提供方生命周期结束。该策略不持久化，也不选择存储分区。
+
+`SidebarSessionView` 使用独立的 `sidebarView` 来源申请、释放一个 `SessionReference`，并管理自己的已提交挂载计数和 Body 保活持有。`SidebarSessionViews` 管理选中、保留策略和视图索引，将生命周期操作委托给视图，而不修改其计数或释放其引用。`RightbarRoot` 接收 `SidebarSessionViewSnapshot` 和已有注入回调，不接收资源所有者对象；它为各视图分别渲染显式 `SessionProvider`，保持会话 key 稳定，渲染器通用的会话重挂载语义不变。
+
+Tab 提供 Body 保活持有，而不独立申请会话引用。这些持有跟随已有 occurrence signal，包括关闭后撤销恢复得到的新 signal；视图不创建第二套 Tab 生命周期。退出视图列表的视图仍留在集合的引用索引中，直到自行释放时移除索引，因此插件关闭时也能清理尚未结束 React 挂载的视图。
+
+只有选中的会话向 frame 报告占位、绑定公共 Sidebar 导航。后台 Tab actions 仍指向自己的已接管存储。`tab.visible` 包含会话和全局面板的可见性，浮动不会让后台会话变成可见。切会话或打开全局面板隐藏整个内容树，收起 Sidebar 则只隐藏停靠 cell，前台浮窗仍可见。隐藏内容不可通过指针或键盘访问，隐藏 Body 内的焦点会被移除。
+
+后台会话没有已初始化的保活 Body 时，从视图列表移除；等已提交的 React 根卸载后再释放引用，避免仍挂载的子树下方先销毁会话 scope。插件释放会清理全部引用，包括等待卸载的已移除视图。Sidebar 插件依赖 `sessions` 和 `uiSession`，任一依赖结束时由 Cordis 卸载它，绑定失效由 `ui-session` 负责。视图不向共享会话 Context 注册销毁回调。仅在目录列表中缺项不视为删除。未访问的 Browser Tab 和无关会话不会提前打开。
+
+### 提供方职责
+
+`BrowserFrame` 仍只负责导航与可观察页面状态。Presentation 创建、挂载载体 DOM，不了解 Pane、裁剪或层叠。Electron 提供方接收物理 attach/detach 回调：隐藏保活内容不触发这些回调，真正卸载则取消未完成的挂载并释放 guest；之后再次物理挂载时从已知地址重建。dispose（资源释放）会等待未完成的创建和 guest 释放，取消后才完成的申请只释放、不挂载。
+
+[Desktop Browser 决策](../feature/2026-09-20-desktop-browser-webview.zh.md)继续负责 guest 安全、共享 IPC 声明和 Workspace 分区所有权。不同 Tab 和会话不能因为共享存储分区就共享一个页面实例。Web 默认仍关闭，显式启用时继续使用 iframe 载体。
+
+### 保活与恢复
+
+| 操作 | 内容处理 |
+|---|---|
+| 切换 Tab | 隐藏旧的保活 cell，显示目标已有 Body。 |
+| 分栏、排序或移到另一个 Pane | 改逻辑归属和 Grid 分配，不搬移 Body。 |
+| 浮动、回停靠或置顶 | 改同一个 frame 的 CSS 模式或 cell 绘制顺序。 |
+| 收起 Sidebar | 隐藏停靠 cell，前台浮窗保持可见。 |
+| 会话 A → B → A | 隐藏并重新显示 A 的原内容树，而非加载已保存 URL。 |
+| 关闭、提供方卸载或真实 generation 结束 | 释放 Body 和 guest；撤销关闭创建新 occurrence。 |
+| 应用重启、窗口刷新或 guest 崩溃 | 走提供方恢复或重试；页面内存和原生 history 不持久化。 |
+
+[布局与提供方恢复](2026-09-14-sidebar-layout-provider-recovery.zh.md)仍然独立：持久化的 Tab 身份、位置和地址支持冷启动，而不是序列化 DOM。隐藏页面可能继续执行脚本、播放媒体或联网。
+
+## Alternatives considered
+
+**只隐藏 Pane。** 可以覆盖收起，但跨 Pane 移动或进入独立浮动 Portal 仍会改变内容祖先。
+
+**只保留前台会话的 Body。** 会话 slot 重挂载仍会断开页面，无法保留现有的切会话体验。
+
+**每个 Tab 独立持有会话引用。** 同一视图的 Tab 共用一个 `SessionProvider`，它的引用必须先于这些 Body 渲染而存在。按视图持有即可覆盖父级及其子节点，无须再为每个 Tab 管理一份引用生命周期。
+
+**缓存并搬移 DOM。** 普通 reparent 会触发 Electron 断开处理；实现不依赖原子搬移、私有挂载 API 或生命周期补丁。
+
+**保留固定 Browser 浮层，改为事件驱动测量或 CSS 锚点定位。** 内容仍然与它模拟的布局分离，而内容本身必须参与 Grid/Flex。
+
+**使用原生 popover。** 普通 Portal 内容无法通过 `z-index` 覆盖 top layer 元素。把菜单、对话框迁移到另一套层叠体系会扩大 Sidebar 之外的改动；实现保留既有 Portal 和层级模型。
+
+**通过递增根 z-index 置顶浮窗。** 不设上限的浮窗数量可能越过菜单和模态层。同层 Grid cell 的 CSS 绘制顺序同时保留层叠与 DOM 身份。
+
+**隐藏时保存 URL 再重建。** 无法保留表单、脚本状态、滚动位置和原生 history。这是丢失实例后的恢复，不是活页面保留。
+
+## Consequences
+
+布局正确性由 Sidebar/DockKit 负责，而不是 Browser。代价是稳定的内容容器与显式会话引用所有权：后台保活不仅持有页面内存，也持有会话 scope 和订阅。没有隐式 LRU 或空闲超时，未来回收需要明确的暂停与恢复策略；其他 Tab 类型不会自动承担这些成本。
+
+变更涉及 Sidebar 控件、浮窗层级、焦点和平台样式，不仅是 Browser 包。[停靠基础设施](../feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md)和 Desktop Browser 记录的引擎、导航、存储与安全决策仍独立有效，因此保留为活动记录；其中的分离内容呈现由本文替代，布局持久化和 Tab 类型导航继续适用。
+
+## Verification
+
+定向 TypeScript 编译覆盖 Sidebar、Browser 和 Desktop 源码，DockKit、Sidebar、Browser、Desktop 打包及 Web 外壳构建完成。未添加或运行测试、未录制演示，也未重启正在运行的 Electron。稳定树实现仍需真实 Electron 验证 guest 身份、表单与 history 保留、多浮窗绘制顺序、缩放、裁剪、放置提示、焦点和平台窗口控件。编译与打包不代表这些运行时观察已通过。
diff --git a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.i18n.yaml b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.i18n.yaml
index 5e501e5f46..137c5eba63 100644
--- a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.md
-2026-09-04-right-sidebar-docking-infrastructure.md: 3ebfe4b3a95ab5820682098be2a4c43f172d1a02
-2026-09-04-right-sidebar-docking-infrastructure.zh.md: dc6516324a368dd86b3e01afb4051a4b20697363
+2026-09-04-right-sidebar-docking-infrastructure.md: c5bfb75730f2037826723bc7fd0aa2bb01005d1e
+2026-09-04-right-sidebar-docking-infrastructure.zh.md: 4959032b53f84654205a1973aee781acb356f999
diff --git a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.md b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.md
index 3ebfe4b3a9..c5bfb75730 100644
--- a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.md
+++ b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.md
@@ -16,6 +16,8 @@ The right column is a per-session docking surface — split panes, tabs, floatin
 
 ### Package topology
 
+The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retained-tab-layout.md) owns one retained tab-content tree for docking, floating and Session switches. The engine, layout state and gesture ownership in this note remain applicable.
+
 | Package | Kind | Owns |
 |---|---|---|
 | `packages/client/ui-dockkit` | static-linked library, zero DSH dependencies | the layout engine and the React components that render and drive it; consumers compile its sources, and it keeps exactly one stylesheet because a consumer de-duplicates injected sheets by file name |
@@ -33,7 +35,7 @@ Components render a snapshot and report settled intents, one per gesture: a drag
 
 [Responsive Sidebar and tab information](../architecture/2026-09-07-sidebar-responsive-tab-info.md) supersedes this note's no-concession layout, overlay presentation and product pane limit. `ui-layout` still owns three-column geometry and pixel width preferences; the Sidebar occupant reports presentation through `ctx.layout.openRightbar(track, fullscreen)` and `closeRightbar()`, without the frame injecting the Sidebar package. Exact width rules belong to [ui-layout](../../../../packages/client/ui-layout/README.md).
 
-The right Sidebar uses one mounted content tree in normal and fullscreen modes; hiding preserves tab state, and fullscreen covers the viewport while retaining underlying column reservation. Floats still use viewport coordinates through a portal and remain open when the Sidebar closes. The product limits docking to two horizontal panes and a 20–80% divider; the generic engine keeps its own defaults.
+The right Sidebar uses one mounted content tree in normal and fullscreen modes; hiding preserves retained tab state, and fullscreen covers the viewport while retaining underlying column reservation. `DockLayout` renders stable Grid cells with fixed-position floating frames in the same tree; foreground floats remain open when the Sidebar closes. The product limits docking to two horizontal panes and a 20–80% divider; the generic engine keeps its own defaults.
 
 ### State
 
@@ -86,7 +88,7 @@ The surface renders tabs whose bodies it does not know: each tab carries a `kind
 - The Detail panel and its duplicate card presentation are gone (a net removal of roughly 1,400 lines); cards are read in place, and `inspect` opens the trajectory view.
 - The frame has no centre floor: a viewport narrower than the two edge columns squeezes the conversation toward zero instead of closing a column.
 - The kit is compiled by its consumers, so a kit change requires a shell rebuild and a page reload; there is no HMR for it.
-- The panel, the float host, and the portalled tab menu use hard-coded z-index values; the client still has no z-index token layer.
+- Docked cells, floating cells and the portalled tab menu use fixed stacking levels; floating cells use CSS paint order within their level. The client still has no global z-index token layer.
 
 ## Testing
 
diff --git a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md
index dc6516324a..4959032b53 100644
--- a/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md
@@ -16,6 +16,8 @@ Agent 产出的文件是最尖锐的案例。产出文件 chip 或 `read` 行的
 
 ### 包拓扑
 
+[Sidebar 稳定挂载决策](../architecture/2026-09-20-sidebar-retained-tab-layout.zh.md)负责停靠、浮动与会话切换共用的一棵保活 Tab 内容树。本文的引擎、布局状态与手势所有权仍然适用。
+
 | 包 | 形态 | 所有物 |
 |---|---|---|
 | `packages/client/ui-dockkit` | 静态链接库，零 DSH 依赖 | 布局引擎与渲染/驱动它的 React 组件；消费方编译其源码，且它只保留一张样式表，因为消费方按文件名去重注入的样式表 |
@@ -33,7 +35,7 @@ Agent 产出的文件是最尖锐的案例。产出文件 chip 或 `read` 行的
 
 [响应式 Sidebar 与标签信息](../architecture/2026-09-07-sidebar-responsive-tab-info.zh.md)取代本记录中的无让步布局、覆盖模式与产品窗格上限。`ui-layout` 仍拥有三列几何与像素宽度偏好，Sidebar 占位项通过 `ctx.layout.openRightbar(track, fullscreen)` 和 `closeRightbar()` 报告呈现方式，框架不注入 Sidebar 包。具体宽度规则见 [ui-layout](../../../../packages/client/ui-layout/README.zh.md)。
 
-右栏在普通与全屏模式下使用同一棵已挂载内容树；隐藏保留标签状态，全屏覆盖视口并保留底层列占位。浮窗仍经 portal 使用视口坐标，不随右栏关闭。产品限制为两个水平窗格与 20–80% 分割比例，通用引擎保留自己的默认值。
+右栏在普通与全屏模式下使用同一棵已挂载内容树；隐藏保留已保活的标签状态，全屏覆盖视口并保留底层列占位。`DockLayout` 在同一棵树中渲染稳定 Grid cell 与 fixed 定位的浮动 frame，前台浮窗不随右栏关闭。产品限制为两个水平窗格与 20–80% 分割比例，通用引擎保留自己的默认值。
 
 ### 状态
 
@@ -86,7 +88,7 @@ Agent 产出的文件是最尖锐的案例。产出文件 chip 或 `read` 行的
 - Detail 面板及其重复的卡片展示消失（净删约 1,400 行）；卡片就地阅读，`inspect` 打开 trajectory 视图。
 - 框架没有中列下限：视口窄于两侧列之和时会话区被挤向零，而不是关掉某一列。
 - 库由消费方编译，改库须重建壳并刷新页面；它没有 HMR。
-- 面板、浮层宿主与 portal 出去的 tab 菜单使用硬编码 z-index；客户端仍没有 z-index token 层。
+- 停靠 cell、浮动 cell 和 portal 菜单使用固定层级，浮动 cell 在所属层内通过 CSS 绘制顺序排序；客户端仍没有全局 z-index token 层。
 
 ## Testing
 
diff --git a/packages/client/ui-sidebar-right/src/client/contract/slots.ts b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
index 6095752b27..5cb8c59e5c 100644
--- a/packages/client/ui-sidebar-right/src/client/contract/slots.ts
+++ b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
@@ -39,7 +39,7 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
 
   interface SlotMap {
     /** Session content selected by the root-scoped right Sidebar controller. */
-    'rightbar.session': { kind: 'single'; scope: 'session'; owner: RightbarOwnerProps }
+    'rightbar.session': { kind: 'single'; scope: 'session'; owner: RightbarOwnerProps & { readonly active: boolean } }
     /**
      * One tab's body, dispatched with the `id` of the type in force for
      * `tab.kind`. A tab type registers here under its definition's `id` and
@@ -148,7 +148,7 @@ export interface SidebarRightTabInfo {
   }
   readonly panel: { readonly id: PaneId }
   readonly tab: TabRecord & {
-    /** Docked bodies need an expanded sidebar and an active tab; expanded titles include inactive tabs. Floats stay visible. */
+    /** Only the foreground Session is visible. Docked bodies also require expansion and selection; its floats survive collapse. */
     readonly visible: boolean
     readonly navigation: SidebarRightTabNavigation
     /** Aborted only when the record disappears or this plugin unloads, not on hide or session switch. */
diff --git a/packages/client/ui-sidebar-right/src/client/index.ts b/packages/client/ui-sidebar-right/src/client/index.ts
index c50c757f23..ddad14a2b6 100644
--- a/packages/client/ui-sidebar-right/src/client/index.ts
+++ b/packages/client/ui-sidebar-right/src/client/index.ts
@@ -33,7 +33,8 @@ import { GuideBody, type GuideInjected } from './tabs/guide/GuideBody.tsx'
 import { GuideTitle } from './tabs/guide/GuideTitle.tsx'
 import { ExpandButton } from './shell/ExpandButton.tsx'
 import { RightbarSeat, type SidebarRightInjected } from './shell/SidebarRight.tsx'
-import { RightbarRoot } from './shell/RightbarRoot.tsx'
+import { RightbarRoot, type RightbarRootInjected } from './shell/RightbarRoot.tsx'
+import { SidebarSessionViews } from './session-views.ts'
 import { createSidebarRightController, type SidebarRightController } from './service.ts'
 import { SidebarRightTabRegistry } from './tab-registry.ts'
 import { createSidebarRightStore } from './stores.ts'
@@ -74,7 +75,7 @@ export type { SidebarRightOpenTab } from './tab-inventory.ts'
 const NS = 'sidebarRight'
 
 /** Required browser services: the slot registry, the frame's panel actions, copy, and the resource model. */
-export const inject = ['slots', 'layout', 'locale', 'resources']
+export const inject = ['slots', 'layout', 'locale', 'resources', 'sessions', 'uiSession']
 
 declare module '@deepseek-ai/cordis' {
   interface Context {
@@ -102,6 +103,14 @@ export function apply(ctx: ClientContext): void {
   // its own apply top level for the same reason.
   const t = ctx.locale.bind(NS)
   const tabs = new SidebarRightTabRegistry(ctx)
+  const views = new SidebarSessionViews(ctx.sessions)
+  ctx.effect(() => {
+    const current = ctx.uiSession.adapter.current
+    const sync = (): void => { views.select(current.getSnapshot().key as SessionId | undefined) }
+    const unsubscribe = current.subscribe(sync)
+    sync()
+    return () => { unsubscribe(); views.dispose() }
+  }, 'ui-sidebar-right: retained Session views')
   const { controller, adopt, forget } = createSidebarRightController(
     tabs,
     (address, signal) => { ctx.resources.pin(address, signal) },
@@ -141,7 +150,7 @@ export function apply(ctx: ClientContext): void {
       },
     }
     const layout: ILayout = ctx.layout
-    const injected: Omit<SidebarRightInjected, 'keyedHooks' | 'occurrence' | 'closeTab'> = {
+    const injected: Omit<SidebarRightInjected, 'keyedHooks' | 'occurrence' | 'closeTab' | 'retainTab'> = {
       syncPresentation({ shown, track, fullscreen }) {
         if (shown) layout.openRightbar(track, fullscreen)
         else layout.closeRightbar()
@@ -156,6 +165,10 @@ export function apply(ctx: ClientContext): void {
       yield ctx.slots.register({
         name: 'rightbar',
         children: { 'rightbar.session': { kind: 'single', scope: 'session' } },
+        inject: (): RightbarRootInjected => ({
+          hooks: { views: views.source },
+          mountView: reference => views.mount(reference),
+        }),
       }, RightbarRoot)
       yield ctx.slots.register({
         name: 'rightbar.session',
@@ -174,6 +187,7 @@ export function apply(ctx: ClientContext): void {
           },
           keyedHooks: { tabNavigation: key => controller.tabDomain.occurrence(sessionId, { id: key as TabId }).navigation },
           occurrence: tab => controller.tabDomain.occurrence(sessionId, tab),
+          retainTab: tabId => views.retainTab(sessionId, tabId, controller.tabDomain.occurrence(sessionId, { id: tabId }).signal),
         }),
       }, RightbarSeat)
     })
diff --git a/packages/client/ui-sidebar-right/src/client/session-view.ts b/packages/client/ui-sidebar-right/src/client/session-view.ts
new file mode 100644
index 0000000000..62c6f51123
--- /dev/null
+++ b/packages/client/ui-sidebar-right/src/client/session-view.ts
@@ -0,0 +1,86 @@
+/** One Sidebar view's Session reference, retained bodies and committed mount lifetime. */
+import type { ISessions, SessionReference } from '@deepseek-ai/dsh-api-session-controller/client'
+import type { SessionId } from '@deepseek-ai/dsh-session/types'
+import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+
+declare module '@deepseek-ai/dsh-api-session-controller/client' {
+  interface SessionReferenceSourceMap {
+    sidebarView: unknown
+  }
+}
+
+/** Owns its reference until retirement finishes or the Sidebar plugin shuts down. */
+export class SidebarSessionView {
+  readonly reference: SessionReference
+  private readonly tabs = new Map<TabId, number>()
+  private mounts = 0
+  private retired = false
+  private disposed = false
+
+  /**
+   * @param sessionId - Session displayed by this view.
+   * @param sessions - allocator for this view's independent reference.
+   * @param onDispose - removes this view from the collection's index before reference release.
+   */
+  constructor(
+    readonly sessionId: SessionId,
+    sessions: ISessions,
+    private readonly onDispose: (view: SidebarSessionView) => void,
+  ) {
+    this.reference = sessions.retain(sessionId, { source: 'sidebarView' })
+    void this.reference.ready.catch(error => { console.error('Sidebar Session opening failed:', error) })
+  }
+
+  /** Whether an initialized retained body still needs this view. */
+  get hasRetainedTabs(): boolean {
+    return this.tabs.size > 0
+  }
+
+  /** @returns cleanup for one committed root; the final cleanup releases a retired view. */
+  mount(): () => void {
+    this.mounts += 1
+    return () => {
+      this.mounts -= 1
+      if (this.retired && this.mounts === 0) this.dispose()
+    }
+  }
+
+  /**
+   * Hold an initialized body until unmount or occurrence cancellation.
+   * @param tabId - initialized body identity.
+   * @param signal - occurrence lifetime; closing and undoing a tab creates a new lifetime.
+   * @param onRelease - lets the collection reconsider retaining this view.
+   * @returns idempotent release of this body's hold.
+   */
+  retainTab(tabId: TabId, signal: AbortSignal, onRelease: () => void): () => void {
+    if (signal.aborted || this.disposed) return () => {}
+    this.tabs.set(tabId, (this.tabs.get(tabId) ?? 0) + 1)
+    let held = true
+    const release = (): void => {
+      if (!held) return
+      held = false
+      signal.removeEventListener('abort', release)
+      const count = this.tabs.get(tabId) as number
+      if (count === 1) this.tabs.delete(tabId)
+      else this.tabs.set(tabId, count - 1)
+      onRelease()
+    }
+    signal.addEventListener('abort', release, { once: true })
+    return release
+  }
+
+  /** End a withdrawn view after its existing committed mounts finish. */
+  retire(): void {
+    this.retired = true
+    if (this.mounts === 0) this.dispose()
+  }
+
+  /** Release once; plugin shutdown does not wait for remaining React mounts. */
+  dispose(): void {
+    if (this.disposed) return
+    this.disposed = true
+    this.retired = true
+    this.onDispose(this)
+    this.reference.release()
+  }
+}
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
new file mode 100644
index 0000000000..badef0a31f
--- /dev/null
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -0,0 +1,90 @@
+/** Selection and retention policy for independently owned Sidebar Session views. */
+import type { ISessions, SessionReference } from '@deepseek-ai/dsh-api-session-controller/client'
+import type { SessionId } from '@deepseek-ai/dsh-session/types'
+import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import { SidebarSessionView } from './session-view.ts'
+
+/** The reference is exclusively a framework SessionProvider target, not a business-component service. */
+export interface SidebarSessionViewSnapshot {
+  readonly sessionId: SessionId
+  readonly reference: SessionReference
+  readonly selected: boolean
+}
+
+/** Selects and retires views; the Sidebar plugin's injected dependencies own global teardown. */
+export class SidebarSessionViews {
+  readonly source = createSnapshotStore<readonly SidebarSessionViewSnapshot[]>([])
+  private readonly views = new Map<SessionId, SidebarSessionView>()
+  private readonly viewsByReference = new Map<SessionReference, SidebarSessionView>()
+  private selected: SessionId | undefined
+  private closed = false
+
+  constructor(private readonly sessions: ISessions) {}
+
+  /** @param sessionId - main selection, or absence; existing retained background views stay bound. */
+  select(sessionId: SessionId | undefined): void {
+    if (this.closed || this.selected === sessionId) return
+    this.selected = sessionId
+    if (sessionId !== undefined && !this.views.has(sessionId)) {
+      const view = new SidebarSessionView(sessionId, this.sessions, disposed => {
+        this.viewsByReference.delete(disposed.reference)
+      })
+      this.views.set(sessionId, view)
+      this.viewsByReference.set(view.reference, view)
+    }
+    for (const view of this.views.values()) this.prune(view)
+    this.publish()
+  }
+
+  /**
+   * Bind a committed root; release retired references after that root unmounts.
+   * @param reference - framework target published by this owner.
+   * @returns releases this committed mount.
+   */
+  mount(reference: SessionReference): () => void {
+    const view = this.viewsByReference.get(reference)
+    if (view === undefined) {
+      if (this.closed) return () => {}
+      throw new Error('Sidebar Session view reference is no longer owned')
+    }
+    return view.mount()
+  }
+
+  /**
+   * Hold an initialized tab occurrence until unmount or occurrence cancellation.
+   * @param sessionId - mounted Session identity.
+   * @param tabId - initialized body identity.
+   * @param signal - occurrence lifetime; closing and undoing a tab creates a new lifetime.
+   * @returns idempotent release of this body's hold.
+   */
+  retainTab(sessionId: SessionId, tabId: TabId, signal: AbortSignal): () => void {
+    if (signal.aborted || this.closed) return () => {}
+    const view = this.views.get(sessionId)
+    if (view === undefined) throw new Error(`Sidebar Session "${sessionId}" has no mounted view`)
+    return view.retainTab(tabId, signal, () => { this.prune(view) })
+  }
+
+  /** Plugin shutdown releases every view, including any awaiting a React unmount. */
+  dispose(): void {
+    this.closed = true
+    this.views.clear()
+    this.source.set([])
+    for (const view of this.viewsByReference.values()) view.dispose()
+  }
+
+  private prune(view: SidebarSessionView): void {
+    if (view.sessionId === this.selected || view.hasRetainedTabs || this.views.get(view.sessionId) !== view) return
+    this.views.delete(view.sessionId)
+    // Render targets must be withdrawn before an unmounted view can release its reference.
+    this.publish()
+    view.retire()
+  }
+
+  private publish(): void {
+    if (this.closed) return
+    this.source.set([...this.views.values()].sort((a, b) => a.sessionId.localeCompare(b.sessionId)).map(view => ({
+      sessionId: view.sessionId, reference: view.reference, selected: view.sessionId === this.selected,
+    })))
+  }
+}
diff --git a/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx b/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
index 46420e5970..79c5d7ecb1 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
+++ b/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
@@ -1,20 +1,38 @@
 /** Root-scoped controller for the right Sidebar's Session content. */
-import type { PropsRenderSlots, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
+import { useLayoutEffect } from 'react'
+import type { HostObservable, InjectFace, PropsRenderSlots, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
+import type { SessionReference } from '@deepseek-ai/dsh-api-session-controller/client'
+import type { SidebarSessionViewSnapshot } from '../session-views.ts'
 import type {} from '../contract/slots.ts'
+import css from './SidebarRight.module.css'
+
+/** Root-only retained Session targets and their committed mount lifetimes. */
+export interface RightbarRootInjected {
+  readonly hooks: { readonly views: HostObservable<readonly SidebarSessionViewSnapshot[]> }
+  readonly mountView: (reference: SessionReference) => () => void
+}
+
+type RootProps = PropsRuntime<'rightbar'> & PropsRenderSlots<'rightbar.session'> & InjectFace<RightbarRootInjected>
+
+function SessionView({ view, visible, SessionProvider, renderSlot, mountView, width, viewportWidth, canShow }:
+  Pick<RootProps, 'SessionProvider' | 'renderSlot' | 'mountView' | 'width' | 'viewportWidth' | 'canShow'>
+  & { readonly view: SidebarSessionViewSnapshot; readonly visible: boolean }) {
+  useLayoutEffect(() => mountView(view.reference), [mountView, view.reference])
+  const active = visible && view.selected
+  return <div className={css.session} hidden={!active} data-sidebar-right-session={view.sessionId}>
+    <SessionProvider session={view.reference}>
+      {renderSlot('rightbar.session', { width, viewportWidth, canShow, active })}
+    </SessionProvider>
+  </div>
+}
 
 /**
- * Render the Session-bound Sidebar only while the Conversation is selected.
- * @param props - frame geometry, panel selection, and the authorized Session renderer.
- * @returns the current Session's right Sidebar, or no content for a global panel.
+ * Keep independent Session subtrees and hide those outside the selected Conversation.
+ * @param props - frame geometry, view targets and the authorized Session renderer.
+ * @returns the foreground and retained background Sidebars.
  */
-export function RightbarRoot({
-  usePanelInfo, SessionProvider, renderSlot, width, viewportWidth, canShow,
-}: PropsRuntime<'rightbar'> & PropsRenderSlots<'rightbar.session'>) {
+export function RightbarRoot({ usePanelInfo, useViews, ...props }: RootProps) {
   const visible = usePanelInfo(info => info.activePanelId === null)
-  if (!visible) return null
-  return (
-    <SessionProvider>
-      {renderSlot('rightbar.session', { width, viewportWidth, canShow })}
-    </SessionProvider>
-  )
+  const views = useViews(value => value)
+  return <>{views.map(view => <SessionView key={view.sessionId} {...props} view={view} visible={visible} />)}</>
 }
diff --git a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.module.css b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.module.css
index 890b897cc8..7c7833556f 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.module.css
+++ b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.module.css
@@ -9,7 +9,7 @@
  * One content tree uses the frame's width normally and fills the viewport in
  * fullscreen. The frame retains a shown wide panel's track in both modes.
  *
- * Hidden, the panel is translated off the frame's right edge rather than
+ * Hidden, docked Grid items translate off the frame's right edge rather than
  * unmounted, so showing and hiding are one slide in both presentations. The
  * transform rides the same variables as the frame's track transition (ui-theme
  * base.css); while squeezing, the panel's left edge and the conversation's right
@@ -17,30 +17,45 @@
  * is out of reach once off-edge, and flips back before the slide starts.
  *
  * The normal panel is below frame overlays (20); fullscreen (40) covers the
- * frame and remains below independently floating panels (60).
+ * frame and remains below independently floating panels (60). The common
+ * content root owns no stacking context or transform.
  */
+.session {
+  display: contents;
+}
+
+.session[hidden] {
+  display: none;
+}
+
 .panel {
+  --dsh-dockkit-dock-layer: 10;
+  --dsh-dockkit-float-layer: 60;
   position: absolute;
   top: 0;
   right: 0;
   bottom: 0;
-  z-index: 10;
   display: flex;
   flex-direction: column;
   min-width: 0;
-  /* The same ground as the conversation: this is a column of the page, not a
-     raised surface. The edge is the weight of the kit's split dividers inside
-     (ui-dockkit `.divider`), so the panel's outline and its inner rules match. */
-  background: var(--dsw-alias-bg-base);
-  border-left: 0.5px solid var(--dsw-alias-border-l4);
-  transform: translateX(100%);
+  pointer-events: none;
+}
+
+/* Only docked Grid items slide. Their common ancestor remains untransformed,
+   unclipped and without a stacking context, so fixed floating children escape. */
+.panel :global([data-dockkit-host='dock']),
+.panel :global([data-dockkit-empty]),
+.panel :global([data-dockkit-divider]) {
+  transform: translateX(var(--dsh-sidebar-width));
   visibility: hidden;
   transition:
     transform var(--ds-transition-duration-slow) var(--ds-ease-in-out),
     visibility 0s linear var(--ds-transition-duration-slow);
 }
 
-.panel[data-sidebar-right-open] {
+.panel[data-sidebar-right-open] :global([data-dockkit-host='dock']),
+.panel[data-sidebar-right-open] :global([data-dockkit-empty]),
+.panel[data-sidebar-right-open] :global([data-dockkit-divider]) {
   transform: none;
   visibility: visible;
   transition: transform var(--ds-transition-duration-slow) var(--ds-ease-in-out);
@@ -60,15 +75,12 @@
 }
 
 .panel[data-sidebar-right-panel='fullscreen'] {
-  position: fixed;
-  inset: 0;
-  z-index: 40;
-  border: none;
+  --dsh-dockkit-dock-layer: 40;
 }
 
 /* No whole-box subtraction here: Electron drag regions are window geometry,
    not stacking, so the frame's leading band does keep acting through this
-   fixed overlay — but the kit already subtracts every box that must stay
+   fullscreen content — but the kit already subtracts every box that must stay
    usable (tabs, strip-end chrome, pane bodies, dividers; ui-dockkit), and
    ui-web base.css subtracts interactive elements and portalled overlays.
    What remains of the band under the strips' blank runs is the window drag
@@ -79,10 +91,10 @@
 
 /* Windows keeps caption controls above fullscreen file and terminal panels. */
 :global([data-windows-titlebar]) .panel[data-sidebar-right-panel='fullscreen'] {
-  overflow: hidden;
-  left: var(--dsh-windows-sidebar-width);
-  max-width: calc(100% - var(--dsh-windows-sidebar-width));
-  top: var(--dsh-windows-titlebar-height);
+  max-width: calc(100vw - var(--dsh-windows-sidebar-width));
+}
+
+:global([data-windows-titlebar]) .panel[data-sidebar-right-panel='fullscreen'] :global([data-dockkit-column='0'][data-dockkit-pane]) {
   border-radius: var(--dsh-windows-content-radius) 0 0 0;
   corner-shape: round;
 }
@@ -90,27 +102,27 @@
 /* macOS fullscreen: the panel reaches the window's top-left corner, where the
    hiddenInset traffic lights (x 16..~68) float over the first pane's tab
    strip. Widen that strip's start inset (dockkit publishes the variable);
-   panes below or right of a divider sit clear of the lights, and every
-   non-first split cell resets the inherited value for its whole subtree. */
-:global([data-platform='darwin']) .panel[data-sidebar-right-panel='fullscreen'] .panelBody {
+   the second Grid column sits clear of the lights and uses the ordinary inset. */
+:global([data-platform='darwin']) .panel[data-sidebar-right-panel='fullscreen'] :global([data-dockkit-host='dock'][data-dockkit-column='0']) {
   /* Lights end near x 68; 88 leaves the same 20px of air the conversation
      header's leading controls keep after them (ui-sidebar HeaderLeadingControls). */
   --dsh-dockkit-strip-inline-start: 88px;
 }
 
-:global([data-platform='darwin']) .panel[data-sidebar-right-panel='fullscreen'] .panelBody :global([data-dockkit-cell]):not(:first-child) {
+:global([data-platform='darwin']) .panel[data-sidebar-right-panel='fullscreen'] :global([data-dockkit-host='dock'][data-dockkit-column='1']) {
   --dsh-dockkit-strip-inline-start: 10px;
 }
 
 /* Window fullscreen hides the traffic lights (html[data-fullscreen], desktop
    preload); the first pane's strip keeps only the ordinary inset. */
-:global([data-platform='darwin'][data-fullscreen]) .panel[data-sidebar-right-panel='fullscreen'] .panelBody {
+:global([data-platform='darwin'][data-fullscreen]) .panel[data-sidebar-right-panel='fullscreen'] :global([data-dockkit-host='dock'][data-dockkit-column='0']) {
   --dsh-dockkit-strip-inline-start: 10px;
 }
 
 @media (prefers-reduced-motion: reduce) {
-  .panel,
-  .panel[data-sidebar-right-open] {
+  .panel :global([data-dockkit-host='dock']),
+  .panel :global([data-dockkit-empty]),
+  .panel :global([data-dockkit-divider]) {
     transition: none;
   }
 }
@@ -159,17 +171,3 @@
   color: var(--dsw-alias-label-tertiary);
   font-size: var(--dsh-content-font-size-secondary, 13px);
 }
-
-/*
- * Host for the portalled floating panels. Panels leave the column so they can
- * cross it and the conversation, which puts them beside the app root rather than
- * inside it — and a sibling of the root does not inherit its stacking, so the
- * level is stated here. The value sits above the frame's own overlay layer;
- * there is no z-index token layer to draw from yet.
- */
-.floatHost {
-  position: fixed;
-  inset: 0;
-  z-index: 60;
-  pointer-events: none;
-}
diff --git a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
index 6b388b219f..87612be6af 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
+++ b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
@@ -2,11 +2,11 @@
  * The Sidebar's seat in the frame, and the panel it draws.
  *
  * The frame owns the right column's geometry; this package owns one content
- * tree at the column width or fixed across the viewport. A shown wide panel
+ * tree at the column width or spanning the viewport. A shown wide panel
  * retains its track in fullscreen, preserving the conversation width. Below
  * 768px fullscreen is derived from viewport width, without changing manual mode.
  *
- * The panel stays mounted while collapsed, translated off the frame's right
+ * Docked content stays mounted while collapsed, translated off the frame's right
  * edge, so opening and closing are one gesture in both presentations: a slide
  * from and to that edge. Normal presentation moves the frame's tracks with
  * the panel. A fullscreen opening reserves its underlying track only after
@@ -17,8 +17,8 @@
  * pane's tab strip, so the strip is the panel's whole top edge. The way back in
  * while collapsed is not here either: it is one button in the conversation
  * header (`ExpandButton.tsx`), because it exists only while this panel is
- * hidden. Floating panels portal out because they must cross the column and the
- * conversation, and the kit already positions them in viewport coordinates.
+ * hidden. Floating panels remain in the same content tree; untransformed
+ * ancestors let their fixed-position frames cross the column and conversation.
  *
  * Tab bodies do not live here. Each one is a registration under its type's kind,
  * dispatched through the keyed `sidebar.right.pane.tab` seat (and a live chip
@@ -28,15 +28,14 @@
  * domain follows each session's store commits, including sessions off screen.
  */
 import { useCallback, useEffect, useLayoutEffect, useMemo, useRef } from 'react'
-import type { ReactNode, RefObject } from 'react'
-import { createPortal } from 'react-dom'
+import type { CSSProperties, ReactNode, RefObject } from 'react'
 import { IconPanelLeftOutlineRegular, Tooltip } from '@deepseek-ai/dsh-client-ui-primitives'
 import type {
   HostObservable, InjectFace, PropsLocale, PropsRenderSlots, PropsRuntime, PropsStore,
 } from '@deepseek-ai/dsh-client-ui-slots'
 import type {} from '../contract/slots.ts'
 import type { DockIntents, DockMode, FloatRect, TabId, TabRecord, TabRenderer } from '@deepseek-ai/dsh-client-ui-dockkit'
-import { canSplit, dockPaneIds, DockSurface, findPaneContentTab, FloatLayer } from '@deepseek-ai/dsh-client-ui-dockkit'
+import { canSplit, dockPaneIds, DockLayout, findPaneContentTab } from '@deepseek-ai/dsh-client-ui-dockkit'
 import type { HalvesFit, LayoutState, PaneId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import { GUIDE_KIND, pageAddress } from '../contract/seed.ts'
@@ -108,6 +107,8 @@ export interface SidebarRightInjected {
   }
   /** Read a committed record's lifetime; never creates an occurrence. */
   readonly occurrence: (tab: Pick<TabRecord, 'id'>) => TabOccurrence
+  /** Keep this Session generation while an initialized body is retained. */
+  readonly retainTab: (tabId: TabId) => () => void
 }
 
 /** The column seat's props: session scope, so the session arrives as a standard prop. */
@@ -133,6 +134,8 @@ interface PanelProps {
   readonly occurrence: SidebarRightInjected['occurrence']
   readonly fullscreen: boolean
   readonly autoFullscreen: boolean
+  readonly active: boolean
+  readonly retainTab: SidebarRightInjected['retainTab']
   /** Receives the kit's room-rule readings for the service's `split`. */
   readonly reportRoom: (fits: ReadonlyMap<PaneId, HalvesFit>) => void
 }
@@ -172,7 +175,7 @@ export function intentsFor(sessionId: SessionId, actions: Store['actions'], open
 }
 
 /** One tab's slot dispatch: which seat, and what to render when no type registered. */
-interface TabSlotProps extends Pick<PanelProps, 'renderSlot' | 'occurrence' | 'useTabTypes' | 'useTabNavigation' | 'useStore' | 'fullscreen'> {
+interface TabSlotProps extends Pick<PanelProps, 'renderSlot' | 'occurrence' | 'useTabTypes' | 'useTabNavigation' | 'useStore' | 'fullscreen' | 'active' | 'retainTab'> {
   readonly tab: TabRecord
   readonly seat: 'sidebar.right.pane.tab' | 'sidebar.right.pane.tab.title'
   readonly fallback: ReactNode
@@ -182,19 +185,22 @@ interface TabSlotProps extends Pick<PanelProps, 'renderSlot' | 'occurrence' | 'u
  * Dispatch one tab's body or title with stable framework hooks and record lifetime.
  */
 function TabSlot({
-  renderSlot, occurrence, useTabTypes, useTabNavigation, useStore, fullscreen, tab, seat, fallback,
+  renderSlot, occurrence, useTabTypes, useTabNavigation, useStore, fullscreen, active, retainTab, tab, seat, fallback,
 }: TabSlotProps): ReactNode {
   const { signal, tabActions } = occurrence(tab)
   const definition = useTabTypes(types => types.find(definition => definition.kind === tab.kind))
+  const retained = seat === 'sidebar.right.pane.tab' && definition?.keepMounted === true
+  useLayoutEffect(() => retained ? retainTab(tab.id) : undefined, [retained, retainTab, tab.id, signal])
   const hookContext = useMemo((): TabHookContext => ({
     tabId: tab.id,
     title: seat === 'sidebar.right.pane.tab.title',
     fullscreen,
+    active,
     signal,
     actions: tabActions,
     useStore,
     useTabNavigation,
-  }), [tab.id, seat, fullscreen, signal, tabActions, useStore, useTabNavigation])
+  }), [tab.id, seat, fullscreen, active, signal, tabActions, useStore, useTabNavigation])
   return renderSlot(seat, {}, { entryKey: definition?.id ?? tab.kind, fallback, hookContext })
 }
 
@@ -207,9 +213,7 @@ function TabSlot({
  */
 function bodiesFor(panel: PanelProps): TabRenderer {
   const { t, ...rest } = panel
-  // Keyed by record: the kit draws one body per pane in one place, and the
-  // keyed slot below keys on the type, so two tabs of one kind would otherwise
-  // share a component instance and its local state (a scroll position, a ref).
+  // Slot dispatch selects a type; the record key separates bodies of that type.
   return tab => (
     <TabSlot
       key={tab.id}
@@ -287,20 +291,18 @@ function PanelChrome({ sessionId, fullscreen, autoFullscreen, actions, t }: Pick
 function SidebarPanel(panel: PanelProps & { width: number; panelRef: RefObject<HTMLDivElement> }): ReactNode {
   const { sessionId, surface, actions, t, renderSlot, openTab, width, reportRoom, fullscreen, autoFullscreen, panelRef } = panel
   const { expanded } = surface.layout
+  const types = panel.useTabTypes(value => value)
   return (
     <div
       ref={panelRef}
       className={css.panel}
-      style={{ width: fullscreen ? '100%' : width }}
+      style={{ width: fullscreen ? '100vw' : width,
+        '--dsh-sidebar-width': fullscreen ? '100vw' : `${width}px` } as CSSProperties}
       data-sidebar-right-panel={fullscreen ? 'fullscreen' : 'push'}
       data-sidebar-right-open={expanded || undefined}
-      // Off-edge is out of reach: the stylesheet's visibility flip takes the
-      // hidden panel out of the tab order, and this takes it out of the
-      // accessibility tree.
-      aria-hidden={!expanded || undefined}
     >
       <div className={css.panelBody}>
-        <DockSurface
+        <DockLayout
           state={surface.layout}
           canSplit={canSplit(surface.layout) && dockPaneIds(surface.layout).length < 2}
           hideSplitWhenBlocked
@@ -312,6 +314,8 @@ function SidebarPanel(panel: PanelProps & { width: number; panelRef: RefObject<H
           labels={dockLabels(t)}
           renderTab={bodiesFor(panel)}
           renderTabTitle={titlesFor(panel)}
+          active={panel.active}
+          keepMounted={tab => types.find(type => type.kind === tab.kind)?.keepMounted === true}
           renderTabMenuItems={(tab, dismiss) =>
             renderSlot('sidebar.right.tab.menu.item', { tab, dismiss })}
           chrome={<PanelChrome sessionId={sessionId} fullscreen={fullscreen} autoFullscreen={autoFullscreen} actions={actions} t={t} />}
@@ -322,34 +326,15 @@ function SidebarPanel(panel: PanelProps & { width: number; panelRef: RefObject<H
   )
 }
 
-/** Portal the floating layer out of whichever seat rendered it. */
-function Floats(panel: PanelProps): ReactNode {
-  const { sessionId, surface, actions, t, openTab } = panel
-  if (surface.layout.floats.length === 0) return null
-  return createPortal(
-    <div className={css.floatHost} data-sidebar-right-float-host>
-      <FloatLayer
-        state={surface.layout}
-        canCloseTab={tabId => canCloseTab(surface, tabId)}
-        intents={intentsFor(sessionId, actions, openTab, panel.closeTab)}
-        labels={dockLabels(t)}
-        renderTab={bodiesFor(panel)}
-        renderTabTitle={titlesFor(panel)}
-      />
-    </div>,
-    document.body,
-  )
-}
-
 /**
- * The right column's occupant: the panel, anchored to the column's edge and
- * shown or hidden by sliding, plus the floating layer. It is also where the
+ * The right column's occupant: stable tab containers, docked or floating.
+ * It is also where the
  * frame learns the panel's presentation, and where `ctx.sidebarRight` learns
  * which session it is acting on, because this is the seat that knows both.
  */
 export function RightbarSeat({
   sessionId, width, viewportWidth, canShow, useStore, actions, t, renderSlot, syncPresentation, bindService, openTab, closeTab,
-  useTabTypes, useTabNavigation, occurrence,
+  useTabTypes, useTabNavigation, occurrence, retainTab, active,
 }: RightbarSeatProps): ReactNode {
   // One store instance per session, so this map holds this session's surface.
   // The binding published below serves the public face's commands on the
@@ -357,7 +342,7 @@ export function RightbarSeat({
   // adopted stores instead.
   const surfaces = useStore(state => state.bySession)
   const surface = surfaces[sessionId]
-  const shown = surface !== undefined && surface.layout.expanded
+  const shown = active && surface !== undefined && surface.layout.expanded
   const autoFullscreen = viewportWidth < 768
   const fullscreen = autoFullscreen || surface?.layout.mode === 'fullscreen'
   const panelRef = useRef<HTMLDivElement | null>(null)
@@ -368,8 +353,8 @@ export function RightbarSeat({
   const track = shown && !autoFullscreen
 
   useEffect(() => {
-    if (surface === undefined) actions.open(sessionId)
-  }, [actions, sessionId, surface])
+    if (active && surface === undefined) actions.open(sessionId)
+  }, [actions, sessionId, surface, active])
 
   useLayoutEffect(() => {
     if (shown && !fullscreen && !canShow) actions.setExpanded(sessionId, false)
@@ -386,7 +371,7 @@ export function RightbarSeat({
   // of the gesture: once at the flip, once after the slide settles and the
   // stylesheet's delayed visibility flip (0.3s) has landed.
   useEffect(() => {
-    if (document.documentElement.dataset.platform !== 'darwin') return
+    if (!active || document.documentElement.dataset.platform !== 'darwin') return
     const panel = panelRef.current
     if (panel === null) return
     let raf: number | null = null
@@ -404,17 +389,18 @@ export function RightbarSeat({
       if (raf !== null) cancelAnimationFrame(raf)
       panel.removeAttribute('data-sidebar-right-region-nudge')
     }
-  }, [shown])
+  }, [shown, active])
 
   // Fullscreen leaves the previous column report in force until its own slide
   // completes. Normal presentation and zero-duration transitions report before paint.
   useLayoutEffect(() => {
+    if (!active) return
     let disposed = false
     const reportWhenCovered = (): void => {
       if (disposed) return
       // A shown panel renders unconditionally and attaches its ref before this effect.
       const entering = shown && fullscreen
-        ? (panelRef.current as HTMLDivElement).getAnimations().filter(animation =>
+        ? (panelRef.current as HTMLDivElement).getAnimations({ subtree: true }).filter(animation =>
           'transitionProperty' in animation && animation.transitionProperty === 'transform'
           && animation.playState !== 'finished' && animation.playState !== 'idle')
         : []
@@ -427,16 +413,18 @@ export function RightbarSeat({
     }
     reportWhenCovered()
     return () => { disposed = true }
-  }, [sessionId, shown, track, fullscreen, syncPresentation])
+  }, [sessionId, shown, track, fullscreen, syncPresentation, active])
   // Leaving is part of that report: a seat that unmounts with its session must
   // hand the track back rather than leave one sized for a surface nobody draws.
-  useLayoutEffect(() => () => { syncPresentation({ shown: false, track: false, fullscreen: false }) }, [syncPresentation])
+  useLayoutEffect(() => active
+    ? () => { syncPresentation({ shown: false, track: false, fullscreen: false }) }
+    : undefined, [syncPresentation, active])
 
   // Republished on every committed change: the service's readers answer from the
   // last commit, and its commands act on the session actually on screen.
   useEffect(
-    () => bindService({ sessionId, actions, surfaces, canSplitPane: paneId => room.current.get(paneId)?.row !== false }),
-    [bindService, sessionId, actions, surfaces],
+    () => active ? bindService({ sessionId, actions, surfaces, canSplitPane: paneId => room.current.get(paneId)?.row !== false }) : undefined,
+    [bindService, sessionId, actions, surfaces, active],
   )
   // The Tab domain is not synced here: the controller adopted this session's
   // store as the runtime minted it and reconciles on the store's own commits,
@@ -445,12 +433,7 @@ export function RightbarSeat({
   if (surface === undefined) return null
   const panel: PanelProps = {
     sessionId, actions, t, renderSlot, surface, openTab, closeTab, useTabTypes, useTabNavigation, useStore, occurrence,
-    fullscreen, autoFullscreen, reportRoom,
+    fullscreen, autoFullscreen, reportRoom, active, retainTab,
   }
-  return (
-    <>
-      <SidebarPanel {...panel} width={width} panelRef={panelRef} />
-      <Floats {...panel} />
-    </>
-  )
+  return <SidebarPanel {...panel} width={width} panelRef={panelRef} />
 }
diff --git a/packages/client/ui-sidebar-right/src/client/tab-info.ts b/packages/client/ui-sidebar-right/src/client/tab-info.ts
index 940b86822a..8205bb95da 100644
--- a/packages/client/ui-sidebar-right/src/client/tab-info.ts
+++ b/packages/client/ui-sidebar-right/src/client/tab-info.ts
@@ -11,6 +11,7 @@ export interface TabHookContext {
   readonly tabId: TabId
   readonly title: boolean
   readonly fullscreen: boolean
+  readonly active: boolean
   readonly signal: AbortSignal
   readonly actions: SidebarRightTabActions
   readonly useStore: PropsStore<ReturnType<typeof createSidebarRightStore>>['useStore']
@@ -25,7 +26,7 @@ export interface TabHookContext {
  */
 export const tabInfoFactory: SlotHookFactory<'sidebar.right.pane.tab', UseSidebarRightTabInfo> = (standard, context) => {
   const { sessionId } = standard
-  const { tabId, title, fullscreen, signal, actions, useStore, useTabNavigation } = context
+  const { tabId, title, fullscreen, active, signal, actions, useStore, useTabNavigation } = context
   return function useTabInfo() {
     const layout = useStore(state => state.bySession[sessionId]?.layout)
     const navigation = useTabNavigation(tabId)
@@ -40,13 +41,13 @@ export const tabInfoFactory: SlotHookFactory<'sidebar.right.pane.tab', UseSideba
         panel: { id: pane.id },
         tab: {
           ...tab,
-          visible: pane.host === 'float' || (layout.expanded && (title || pane.activeTabId === tabId)),
+          visible: active && (pane.host === 'float' || (layout.expanded && (title || pane.activeTabId === tabId))),
           navigation,
           signal,
           actions,
         },
       }
-    }, [layout, navigation, tabId, title, fullscreen, signal, actions])
+    }, [layout, navigation, tabId, title, fullscreen, active, signal, actions])
   }
 }
 
diff --git a/packages/client/ui-sidebar-right/src/client/tab-registry.ts b/packages/client/ui-sidebar-right/src/client/tab-registry.ts
index 7961a5e4ad..76de73578a 100644
--- a/packages/client/ui-sidebar-right/src/client/tab-registry.ts
+++ b/packages/client/ui-sidebar-right/src/client/tab-registry.ts
@@ -101,6 +101,8 @@ export interface SidebarRightTabDefinition {
   readonly kind: string
   /** Each open by kind creates independent content; omission keeps one page per kind in each pane. */
   readonly multiple?: boolean
+  /** Lazily keep a visited body mounted through hiding, Session changes and docking; default false. */
+  readonly keepMounted?: boolean
   /**
    * Resource-address globs this type recognizes; omit for a page type, which is
    * opened by kind and recognizes no address.

From cbd866fa72b7c3ae1aed0da7845be0341a18516b Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 00:54:47 +0800
Subject: [PATCH 47/62] refactor(browser): separate navigation and presentation
 providers

---
 .../2026-09-16-sidebar-browser.i18n.yaml      |   4 +-
 .../feature/2026-09-16-sidebar-browser.md     |  22 +-
 .../feature/2026-09-16-sidebar-browser.zh.md  |  22 +-
 .../client/ui-sidebar-browser/package.json    |   7 +
 .../src/client/browser/BrowserController.ts   | 310 +++++++++++-------
 .../src/client/browser/BrowserFrame.ts        | 122 ++-----
 .../src/client/browser/BrowserNavigation.ts   |  37 +--
 .../src/client/browser/BrowserPage.ts         |  20 ++
 .../src/client/browser/BrowserPersistence.ts  |  35 ++
 .../src/client/browser/ElectronWebViewImpl.ts | 266 +++++++++++++++
 .../src/client/browser/IframeImpl.ts          |  96 ++++++
 .../src/client/browser/store.ts               |   2 +-
 .../src/client/browser/workspace.ts           |  28 ++
 .../ui-sidebar-browser/src/client/index.ts    |  52 ++-
 .../ui-sidebar-browser/src/client/locales.ts  |  10 +-
 .../ui-sidebar-browser/src/client/pages.ts    |  35 ++
 .../src/client/view/Browser.module.css        |  38 +++
 .../src/client/view/BrowserBody.tsx           | 151 ++++-----
 .../src/client/view/BrowserPresentation.ts    |   9 +
 .../src/client/view/BrowserTitle.tsx          |   4 +-
 .../view/ElectronWebviewPresentation.ts       |  82 +++++
 .../src/client/view/IframePresentation.ts     |  85 +++++
 .../client/ui-sidebar-browser/src/desktop.ts  |  27 ++
 .../client/ui-sidebar-browser/tsconfig.json   |   2 +
 .../ui-sidebar-browser/tsdown.config.ts       |   2 +-
 pnpm-lock.yaml                                |   6 +
 tsconfig.base.json                            |   1 +
 27 files changed, 1088 insertions(+), 387 deletions(-)
 create mode 100644 packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/pages.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/view/BrowserPresentation.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
 create mode 100644 packages/client/ui-sidebar-browser/src/desktop.ts

diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
index b261e98e5b..dcea202398 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
-2026-09-16-sidebar-browser.md: 3fa4e1dbb70dee97dbe6052d925271d093f2877c
-2026-09-16-sidebar-browser.zh.md: 69d78dbf2b959d660c9397c7bf7634547a109a9e
+2026-09-16-sidebar-browser.md: ffea3d4bb75a67b7ed1c6f5c6b2450a80190b0c3
+2026-09-16-sidebar-browser.zh.md: da1ed607804b940f0b614411b78ab895581832ed
diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
index 3fa4e1dbb7..ffea3d4bb7 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
@@ -18,11 +18,11 @@ A parent page cannot inspect or drive a cross-origin iframe's internal history.
 
 The address parser accepts `http:` and `https:`, including loopback targets; a host name without a scheme becomes HTTPS. It rejects embedded credentials, the application's own origin, malformed addresses, `file:` URLs, and every other scheme. Document Preview remains the local-file surface.
 
-The current carrier is an iframe in both Web and Desktop. Its default Web policy is `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`; the frame has no direct download or top-navigation flag. Popups escape the sandbox, and a Web popup retains its opener and can use that chain to navigate the top-level application. Same-origin lets the visited origin use its own cookies and Web storage; it does not make a cross-origin target same-origin with DSH. The iframe sends no referrer and adds no package-owned Permissions Policy, so browser defaults and user grants apply. A rightmost toolbar toggle removes the sandbox attribute for that tab occurrence; the mode is not persisted and renders a warning while active. An unsandboxed page can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. The package performs no Host-side URL probe or proxy.
+The Web carrier is an iframe; Desktop uses the [retained webview carrier](2026-09-20-desktop-browser-webview.md). Its default Web policy is `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`; the frame has no direct download or top-navigation flag. Popups escape the sandbox, and a Web popup retains its opener and can use that chain to navigate the top-level application. Same-origin lets the visited origin use its own cookies and Web storage; it does not make a cross-origin target same-origin with DSH. The iframe sends no referrer and adds no package-owned Permissions Policy, so browser defaults and user grants apply. A rightmost toolbar toggle removes the sandbox attribute for that tab occurrence; the mode is not persisted and renders a warning while active. An unsandboxed page can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. The package performs no Host-side URL probe or proxy.
 
-Each tab receives one `BrowserController` class. Its command interface contains only `loadUrl`, `goBack`, `goForward`, and `reload`; it owns address validation and the `BrowserNavigation` state machine. The `BrowserFrame` interface owns transient sandbox and document state plus carrier operations, and `IframeImpl` implements it for the current iframe carrier. Slot injection exposes keyed frame state through `useBrowserFrame` and supplies plain callbacks, so the React body receives neither the controller nor an observable source; it owns only the editable draft and iframe DOM. A future `ElectronWebViewImpl` can implement the same interface without putting URL or carrier state in the component.
+Each tab receives one `BrowserController` for address validation and carrier-independent commands. `BrowserFrame` exposes navigation, observable address/loading/history/error state, and an optional sandbox control; `BrowserPresentation` owns DOM attachment. `pages.ts` composes these two objects into a `BrowserPage`. `IframeImpl` owns application-known `BrowserNavigation`, while `ElectronWebViewImpl` observes native history. Slot injection exposes keyed controller state through `useBrowserState` and plain callbacks; the React body owns its draft and content container, with no carrier branch, controller instance or observable source.
 
-`BrowserNavigation` keeps the canonical current URL, controlled-load revision, navigation state, and a bounded sequence with its index. A new address drops the forward branch; Back and Forward move the index; Reload recreates the last application-known URL without adding history. A remounted body reloads the latest application-known URL and consults its optional initial URL only before the first controlled target. The Session-scoped store only persists immutable snapshots from that class for title rendering and application reload. An occurrence abort removes its bucket; `TabDomain` uses that same abort for both tab removal and `ui-sidebar-right` unload, so unloading or hot-reloading the Sidebar clears Browser history even when DockKit later restores the tab record.
+For the iframe carrier, `BrowserNavigation` keeps the canonical current URL, controlled-load revision, navigation state, and a bounded sequence with its index. A new address drops the forward branch; Back and Forward move the index; Reload recreates the last application-known URL without adding history. A remounted body reloads the latest application-known URL and consults its optional initial URL only before the first controlled target. The Session-scoped store only persists immutable snapshots from that class for title rendering and application reload. An occurrence abort removes its bucket; `TabDomain` uses that same abort for both tab removal and `ui-sidebar-right` unload, so unloading or hot-reloading the Sidebar clears Browser history even when DockKit later restores the tab record.
 
 Browser state is presentation state. It does not enter the Session log, model request, resource model, or DockKit layout operations. The existing [right Sidebar infrastructure](2026-09-04-right-sidebar-docking-infrastructure.md), [tab type contract](../architecture/2026-09-05-sidebar-tab-types-and-navigation.md), [resource model](../architecture/2026-09-05-client-resource-model.md), and [Document Preview operations](../architecture/2026-09-08-document-preview-operations.md) retain their existing responsibilities.
 
@@ -39,17 +39,9 @@ The Web carrier treats only the first iframe `load` for a controlled revision as
 
 Address editing is available in every state. An invalid draft reports an address failure without changing the current navigation state. Focusing the unknown address hides its marker and reveals Go; Enter and Go both start a controlled load. Changing sandbox mode reloads the last controlled Web target under a new revision. An iframe `error` event marks only the current `BrowserFrame` revision with a transient load-failure notice; it does not change URL history, and the next controlled document clears it. Browsers do not reliably emit this event for DNS, TLS, mixed-content, CSP, or `X-Frame-Options` failures. `pushState`, `replaceState`, and fragment changes that emit no iframe `load` remain unobservable.
 
-## Deferred Electron carrier
+## Electron carrier
 
-Electron `<webview>` support is designed but is not registered or tested. The controller keeps the same four commands, while a separate per-tab view object owns attachment, detachment, state observation, and target identity. This follows Playwright's Android WebView split: `AndroidWebView` is a target and lifecycle handle identified by package, process, and debugging socket, while `page()` returns the regular `Page` that owns Web navigation and DOM commands; device-level input remains on `AndroidDevice`.
-
-The Desktop design enables `webviewTag` only on the application window. Its isolated preload receives an unguessable per-window capability, and every Browser tab appends a fresh UUID to form a distinct non-persistent partition. The main process accepts only an initial `about:blank` guest carrying that capability, removes any preload, and forces sandbox, context isolation, disabled Node integration in all frames, Web security, secure-content checks, disabled nested webviews, and disabled plugins.
-
-The main process allows page-initiated main-frame navigation and redirects only to credential-free HTTP(S). Requests may use HTTP(S), WebSocket, data, and Blob URLs; direct file, custom-protocol, extension, and privileged requests are cancelled. Permission checks and requests, display capture, device grants, downloads, popup windows, and drag-and-drop navigation are denied.
-
-The view object keeps an inactive guest connected in an owned hidden DOM host and moves it back into the visible placeholder without recreation. This retains page and target identity across Sidebar body remounts. Because `<webview>` participates in renderer layout and compositing, ordinary DOM dialogs, menus, tooltips, and drag previews can cover it. `WebContentsView` remains unsuitable because it is a native child surface: CSS cannot cover it, and every overlay or animation would require main-process visibility and bounds synchronization.
-
-Each guest is a distinct WebContents and CDP target. Development may expose Electron's process-wide remote-debugging port and select the guest target explicitly. Production keeps that endpoint disabled; browser-use or computer-use requires an authenticated broker that binds one authorized tab to its WebContents and uses `webContents.debugger` or an equivalently scoped transport without publishing every application target.
+The [Desktop webview decision](2026-09-20-desktop-browser-webview.md) owns native page lifetime, Workspace storage sharing, guest policy, and runtime verification gaps. The iframe behavior in this note remains independently useful; its cross-origin limitations do not describe the Desktop carrier.
 
 ## Alternatives considered
 
@@ -69,6 +61,6 @@ Unit tests cover protocol parsing, delegated Markdown links, controller commands
 
 ## Consequences
 
-The Browser adds no Electron privilege and behaves identically in current Web and Desktop builds. Many sites refuse iframe embedding or require downloads or top-level navigation withheld from the frame by the default sandbox. An HTTPS application can block public HTTP pages as mixed content or restrict private-network requests, and disabling the sandbox does not bypass those browser policies. Disabling the sandbox otherwise trades its protections for compatibility: the frame can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. A Web popup that escapes the sandbox retains its opener and can navigate the top-level application through that chain. Neither path adds Electron or Node APIs. The URL gate cannot prevent an embedded page from choosing its own destination. A later iframe load exposes that navigation occurred but not its cross-origin URL; History API and fragment changes can remain completely invisible. The deferred Electron carrier requires real packaged-app verification before it can become current behavior.
+The iframe carrier exposes no Electron or Node APIs. Many sites refuse iframe embedding or require downloads or top-level navigation withheld from the frame by the default sandbox. An HTTPS application can block public HTTP pages as mixed content or restrict private-network requests, and disabling the sandbox does not bypass those browser policies. Disabling the sandbox otherwise trades its protections for compatibility: the frame can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. A Web popup that escapes the sandbox retains its opener and can navigate the top-level application through that chain. Neither path adds Electron or Node APIs. The URL gate cannot prevent an embedded page from choosing its own destination. A later iframe load exposes that navigation occurred but not its cross-origin URL; History API and fragment changes can remain completely invisible.
 
-Site-cookie behavior follows the user's browser and is not isolated per Browser tab. Local files are rejected and remain owned by Document Preview. Persisted URLs can contain sensitive query or fragment values, so users must not enter credentials they do not want retained in application-local browser storage.
+Web site-cookie behavior follows the user's browser and is not isolated per Browser tab. Local files are rejected and remain owned by Document Preview. Persisted URLs can contain sensitive query or fragment values, so users must not enter credentials they do not want retained in application-local browser storage.
diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
index 69d78dbf2b..da1ed60780 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
@@ -18,11 +18,11 @@ Status: implemented
 
 地址解析器接受 `http:` 与 `https:`，包括 loopback 目标；不带 scheme 的主机名补为 HTTPS。它拒绝内嵌凭据、应用自身 origin、畸形地址、`file:` URL，以及所有其他 scheme。本地文件继续由 Document Preview 负责。
 
-当前 Web 与 Desktop 都使用 iframe 载体。它的默认 Web 策略是 `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`；frame 没有直接的下载或顶层导航 flag。popup 会脱离 sandbox，Web popup 会保留 opener，并可以通过该链导航顶层应用。same-origin 允许被访问的 origin 使用自己的 Cookie 与 Web storage；它不会让跨域目标与 DSH 变成同源。iframe 不发送 referrer，也不添加包自有的 Permissions Policy，因此浏览器默认策略与用户授权生效。最右侧 toolbar 开关会为当前 tab occurrence 移除 sandbox attribute；该模式不持久化，启用期间持续显示警告。未受 sandbox 约束的页面可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。本包不执行 Host 侧 URL probe 或代理。
+Web 使用 iframe 载体；Desktop 使用[保持页面实例的 webview 载体](2026-09-20-desktop-browser-webview.zh.md)。它的默认 Web 策略是 `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`；frame 没有直接的下载或顶层导航 flag。popup 会脱离 sandbox，Web popup 会保留 opener，并可以通过该链导航顶层应用。same-origin 允许被访问的 origin 使用自己的 Cookie 与 Web storage；它不会让跨域目标与 DSH 变成同源。iframe 不发送 referrer，也不添加包自有的 Permissions Policy，因此浏览器默认策略与用户授权生效。最右侧 toolbar 开关会为当前 tab occurrence 移除 sandbox attribute；该模式不持久化，启用期间持续显示警告。未受 sandbox 约束的页面可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。本包不执行 Host 侧 URL probe 或代理。
 
-每个 tab 获得一个 `BrowserController` class。它的命令接口只有 `loadUrl`、`goBack`、`goForward` 与 `reload`；它负责地址校验和 `BrowserNavigation` 状态机。`BrowserFrame` 接口负责临时 sandbox 与 document 状态以及载体操作，`IframeImpl` 为当前 iframe 载体实现该接口。Slot injection 通过 `useBrowserFrame` 提供按 key 索引的 frame 状态，并提供普通 callback，因此 React body 不接收 controller 或 observable source；它只负责可编辑草稿与 iframe DOM。未来的 `ElectronWebViewImpl` 可以实现相同接口，而不把 URL 或载体状态放进组件。
+每个 tab 获得一个 `BrowserController`，负责地址校验与载体无关的命令。`BrowserFrame` 提供导航、可观察的地址/加载/history/错误状态和可选 sandbox 控制，`BrowserPresentation` 负责 DOM 挂载。`pages.ts` 把两个对象组装成 `BrowserPage`。`IframeImpl` 持有应用已知的 `BrowserNavigation`，`ElectronWebViewImpl` 则观察原生 history。Slot injection 通过 `useBrowserState` 提供按 key 索引的控制器状态和普通回调；React body 只持有草稿与内容容器，没有载体分支、控制器实例或可观察源。
 
-`BrowserNavigation` 保存 canonical 当前 URL、受控加载 revision、导航状态，以及有上限的序列与当前位置。新地址丢弃 forward 分支；后退和前进移动 index；刷新重建应用最后已知的 URL 且不增加 history。body 重挂载时会重新加载应用最后已知的 URL，并且仅在尚无受控目标时使用可选初始 URL。Session-scoped store 只持久化该 class 的 immutable snapshot，供标题渲染与应用刷新恢复。occurrence abort 会删除其 bucket；`TabDomain` 对 tab 删除与 `ui-sidebar-right` 卸载使用同一个 abort，因此卸载或热重载 Sidebar 会清空 Browser history，即使 DockKit 随后恢复 tab record。
+对于 iframe 载体，`BrowserNavigation` 保存 canonical 当前 URL、受控加载 revision、导航状态，以及有上限的序列与当前位置。新地址丢弃 forward 分支；后退和前进移动 index；刷新重建应用最后已知的 URL 且不增加 history。body 重挂载时会重新加载应用最后已知的 URL，并且仅在尚无受控目标时使用可选初始 URL。Session-scoped store 只持久化该 class 的 immutable snapshot，供标题渲染与应用刷新恢复。occurrence abort 会删除其 bucket；`TabDomain` 对 tab 删除与 `ui-sidebar-right` 卸载使用同一个 abort，因此卸载或热重载 Sidebar 会清空 Browser history，即使 DockKit 随后恢复 tab record。
 
 Browser 状态只属于呈现层，不进入 Session log、模型请求、resource model 或 DockKit layout operation。现有的[右侧 Sidebar 基础设施](2026-09-04-right-sidebar-docking-infrastructure.zh.md)、[tab 类型契约](../architecture/2026-09-05-sidebar-tab-types-and-navigation.zh.md)、[resource model](../architecture/2026-09-05-client-resource-model.zh.md)和[文档预览操作](../architecture/2026-09-08-document-preview-operations.zh.md)继续负责各自现有职责。
 
@@ -39,17 +39,9 @@ Browser 状态只属于呈现层，不进入 Session log、模型请求、resour
 
 每个状态都允许编辑地址。无效草稿只报告地址错误，不改变当前导航状态。聚焦 unknown 地址会隐藏标记并显示前往按钮；回车与前往都会启动受控加载。切换 sandbox 模式会使用新的 revision 重新加载最后一个受控 Web 目标。iframe `error` event 只会为当前 `BrowserFrame` revision 标记临时加载失败 notice；它不改变 URL history，下一个受控 document 会清除它。浏览器不会为 DNS、TLS、mixed-content、CSP 或 `X-Frame-Options` 失败可靠触发该 event。不产生 iframe `load` 的 `pushState`、`replaceState` 与 fragment 变化仍不可观察。
 
-## Deferred Electron carrier
+## Electron carrier
 
-Electron `<webview>` 支持已经完成设计，但当前不注册也不测试。controller 保持相同的四个命令，独立的 per-tab view 对象负责 attachment、detachment、状态观察与 target identity。这沿用 Playwright 的 Android WebView 划分：`AndroidWebView` 是由 package、process 与调试 socket 标识的 target 和生命周期 handle，`page()` 返回负责 Web 导航与 DOM 命令的普通 `Page`；设备级输入仍属于 `AndroidDevice`。
-
-Desktop 设计只在应用窗口启用 `webviewTag`。其隔离 preload 获得不可猜的 per-window capability，每个 Browser tab 再追加新的 UUID，形成独立非持久化 partition。主进程只接受携带该 capability 且初始地址为 `about:blank` 的 guest，删除任何 preload，并强制启用 sandbox 与 context isolation、在所有 frame 禁用 Node integration、启用 Web security 与安全内容检查、禁用嵌套 webview 和 plugin。
-
-主进程只允许页面发起的 main-frame 导航与重定向前往不含凭据的 HTTP(S)。请求可以使用 HTTP(S)、WebSocket、data 与 Blob URL；直接 file、自定义协议、extension 与特权请求都会被取消。permission 检查与请求、显示捕获、设备授权、下载、弹窗和拖放导航全部拒绝。
-
-view 对象把非活动 guest 保持连接并停放在自有隐藏 DOM host 中，再把它移回可见占位符而不重建。这会在 Sidebar body remount 后保留页面与 target identity。因为 `<webview>` 参与 renderer 布局与合成，普通 DOM dialog、menu、tooltip 与拖拽预览可以覆盖它。`WebContentsView` 仍不合适，因为它是原生 child surface：CSS 无法覆盖它，每个 overlay 或动画都需要主进程同步 visibility 与 bounds。
-
-每个 guest 都是独立 WebContents 和 CDP target。开发环境可以开放 Electron 的进程级 remote-debugging port，并明确选择 guest target。生产环境保持该 endpoint 关闭；browser-use 或 computer-use 需要一个经过认证的 broker，把一个已授权 tab 绑定到其 WebContents，并使用 `webContents.debugger` 或等价的 scoped transport，而不公开全部应用 target。
+[Desktop webview 决策](2026-09-20-desktop-browser-webview.zh.md)负责原生页面生命周期、Workspace 存储共享、guest 策略与运行时验证缺口。本文的 iframe 行为仍具有独立价值；其跨域限制不描述 Desktop 载体。
 
 ## Alternatives considered
 
@@ -69,6 +61,6 @@ view 对象把非活动 guest 保持连接并停放在自有隐藏 DOM host 中
 
 ## Consequences
 
-Browser 不增加 Electron 权限，并在当前 Web 与 Desktop 构建中保持相同行为。很多站点拒绝 iframe 嵌入，或者依赖默认 sandbox 不向 frame 提供的下载或顶层导航。HTTPS 应用可能按 mixed-content 策略阻止公共 HTTP 页面，或限制 private-network 请求；关闭 sandbox 也无法绕过这些浏览器策略。关闭 sandbox 在其他方面会用自身保护换取兼容性：frame 可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。逃逸出 sandbox 的 Web popup 会保留 opener，并可以通过该链导航顶层应用。这两条路径都不会增加 Electron 或 Node API。URL 检查无法阻止 iframe 内页面自行选择目标。后续 iframe load 能表明已经发生导航，但无法给出跨域 URL；History API 与 fragment 变化可能完全不可见。延期的 Electron 载体必须通过真实打包应用验证，才能成为当前行为。
+iframe 载体不暴露 Electron 或 Node API。很多站点拒绝 iframe 嵌入，或者依赖默认 sandbox 不向 frame 提供的下载或顶层导航。HTTPS 应用可能按 mixed-content 策略阻止公共 HTTP 页面，或限制 private-network 请求；关闭 sandbox 也无法绕过这些浏览器策略。关闭 sandbox 在其他方面会用自身保护换取兼容性：frame 可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。逃逸出 sandbox 的 Web popup 会保留 opener，并可以通过该链导航顶层应用。这两条路径都不会增加 Electron 或 Node API。URL 检查无法阻止 iframe 内页面自行选择目标。后续 iframe load 能表明已经发生导航，但无法给出跨域 URL；History API 与 fragment 变化可能完全不可见。
 
-站点 Cookie 行为遵循用户浏览器，并不按 Browser tab 隔离。本地文件会被拒绝，并继续由 Document Preview 负责。持久化 URL 可能含敏感 query 或 fragment，因此用户不应在地址栏输入不希望保留在应用本地浏览器存储中的凭据。
+Web 站点 Cookie 行为遵循用户浏览器，并不按 Browser tab 隔离。本地文件会被拒绝，并继续由 Document Preview 负责。持久化 URL 可能含敏感 query 或 fragment，因此用户不应在地址栏输入不希望保留在应用本地浏览器存储中的凭据。
diff --git a/packages/client/ui-sidebar-browser/package.json b/packages/client/ui-sidebar-browser/package.json
index 3e833cf496..bf289be029 100644
--- a/packages/client/ui-sidebar-browser/package.json
+++ b/packages/client/ui-sidebar-browser/package.json
@@ -22,6 +22,10 @@
       "types": "./lib/types/client/index.d.ts",
       "default": "./lib/client.js"
     },
+    "./desktop": {
+      "types": "./lib/types/desktop.d.ts",
+      "default": "./lib/desktop.js"
+    },
     "./src/*": "./src/*",
     "./package.json": "./package.json"
   },
@@ -44,6 +48,8 @@
   },
   "devDependencies": {
     "@deepseek-ai/cordis": "workspace:^",
+    "@deepseek-ai/dsh-api-workspace-controller": "workspace:^",
+    "@deepseek-ai/dsh-brand": "workspace:^",
     "@deepseek-ai/dsh-client-locale": "workspace:^",
     "@deepseek-ai/dsh-client-store": "workspace:^",
     "@deepseek-ai/dsh-client-ui-dockkit": "workspace:^",
@@ -61,6 +67,7 @@
   "files": [
     "lib/index.js",
     "lib/client.js",
+    "lib/desktop.js",
     "lib/types/**/*.d.ts"
   ]
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index afa413010f..346e570b77 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -1,166 +1,226 @@
-/** Per-tab Browser controller. */
-import type { BoundActions } from '@deepseek-ai/dsh-client-store'
+/** Carrier-independent tab commands and renderer-facing state. */
+import { createSnapshotStore, type BoundActions, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import type { HostObservable } from '@deepseek-ai/dsh-client-ui-slots'
-import { IframeImpl } from './BrowserFrame.ts'
-import type { BrowserFrame, BrowserFrameState } from './BrowserFrame.ts'
-import { BrowserNavigation } from './BrowserNavigation.ts'
-import type { BrowserTabState } from './BrowserNavigation.ts'
+import type { BrowserFrameState } from './BrowserFrame.ts'
+import type { BrowserPage, BrowserPageFactory } from './BrowserPage.ts'
+import { currentBrowserTarget, type BrowserTabState } from './BrowserPersistence.ts'
 import type { BrowserStore } from './store.ts'
-import { parseBrowserAddress } from './url.ts'
+import { parseBrowserAddress, type BrowserAddressFailure } from './url.ts'
 
-/** Construction dependencies for one tab-scoped Browser controller. */
+/** Live tab state; navigation comes from its provider and draft validation stays local. */
+export interface BrowserControllerState {
+  readonly frame: BrowserFrameState
+  readonly addressFailure: BrowserAddressFailure | undefined
+  readonly addressRevision: number
+}
+
+/** Construction inputs for one tab occurrence. */
 export interface BrowserControllerOptions {
   readonly tabId: TabId
   readonly signal: AbortSignal
   readonly applicationOrigin: string
-  readonly initial?: BrowserTabState
+  readonly initial: BrowserTabState | undefined
   readonly actions: BoundActions<BrowserStore>
+  readonly createPage: BrowserPageFactory
+  readonly openTab: (url: string) => void
 }
 
-/** Owns one Browser tab's URL state, loading lifecycle, and four navigation commands. */
-export class BrowserController {
-  /** Renderer-facing iframe and sandbox state. */
-  readonly frame: BrowserFrame
-  private readonly navigation: BrowserNavigation
+/** Owns input validation and page lifetime without inspecting the carrier type. */
+export class BrowserController implements HostObservable<BrowserControllerState> {
+  private readonly page: BrowserPage
+  private readonly store: SnapshotStore<BrowserControllerState>
+  private readonly unsubscribe: () => void
+  private actions: BoundActions<BrowserStore>
+  private checkpoint: BrowserTabState | undefined
+  private started = false
   private disposed = false
+  private disposal: Promise<void> | undefined
+  private readonly abort = (): void => { void this.dispose() }
 
-  /**
-   * @param options - tab identity, persistence writer, URL origin, and lifetime.
-   */
+  /** @param options - identity, persistence, page factory and source-tab navigation. */
   constructor(private readonly options: BrowserControllerOptions) {
-    this.navigation = new BrowserNavigation(options.initial)
-    this.frame = new IframeImpl(
-      () => { this.reload() },
-      (revision) => { this.frameLoaded(revision) },
-    )
-    options.signal.addEventListener('abort', () => { this.dispose() }, { once: true })
+    this.actions = options.actions
+    this.checkpoint = options.initial
+    this.page = options.createPage({
+      initial: options.initial,
+      persist: state => {
+        if (this.disposed) return
+        this.checkpoint = state
+        this.actions.replace(options.tabId, state)
+      },
+      openRequested: value => {
+        if (this.disposed) return
+        const result = parseBrowserAddress(value, options.applicationOrigin)
+        if (!result.ok) { this.addressFailed(result.reason); return }
+        options.openTab(result.target.url)
+      },
+    })
+    this.store = createSnapshotStore({ frame: this.page.frame.getSnapshot(), addressFailure: undefined, addressRevision: 0 })
+    this.unsubscribe = this.page.frame.subscribe(() => {
+      if (this.disposed) return
+      const current = this.store.getSnapshot()
+      const frame = this.page.frame.getSnapshot()
+      const changed = frame.target?.url !== current.frame.target?.url
+      this.store.set({ frame, addressFailure: changed ? undefined : current.addressFailure,
+        addressRevision: current.addressRevision + Number(changed) })
+    })
+    options.signal.addEventListener('abort', this.abort, { once: true })
   }
 
-  /**
-   * Validate and load one address, replacing a same-address load with Reload.
-   * @param value - address-bar or typed-tab value.
-   */
+  /** @returns immutable state for the common toolbar. */
+  getSnapshot = (): BrowserControllerState => this.store.getSnapshot()
+  /** @param listener - state invalidation. @returns unsubscribe callback. */
+  subscribe = (listener: () => void): (() => void) => this.store.subscribe(listener)
+
+  /** @param viewportId - mounted content container. @returns physical attachment cleanup only. */
+  mount(viewportId: string): () => void {
+    this.publishSaved()
+    return this.page.presentation.mount(viewportId)
+  }
+
+  /** @param initialUrl - typed-open address used only when no checkpoint exists. */
+  start(initialUrl: string | undefined): void {
+    if (this.started || this.disposed) return
+    this.started = true
+    const value = currentBrowserTarget(this.checkpoint)?.url ?? initialUrl
+    if (value !== undefined) this.loadUrl(value)
+  }
+
+  /** @param value - address-bar or typed-open input. */
   loadUrl(value: string): void {
     if (this.disposed) return
     const parsed = parseBrowserAddress(value, this.options.applicationOrigin)
-    if (!parsed.ok) {
-      this.navigation.addressFailed(parsed.reason)
-      this.publish()
-      return
-    }
-    const current = BrowserNavigation.current(this.navigation.snapshot)
-    if (current?.url === parsed.target.url) {
-      this.reload()
-      return
-    }
-    this.start(this.navigation.navigate(parsed.target))
+    if (!parsed.ok) { this.addressFailed(parsed.reason); return }
+    this.command(() => { this.page.frame.loadUrl(parsed.target) })
   }
 
-  /** Move to the preceding application-known address when Web history remains usable. */
-  goBack(): void {
-    if (this.disposed) return
-    const request = this.navigation.back()
-    if (request !== undefined) this.start(request)
+  /** Delegate Back to the page's navigation provider. */
+  goBack(): void { this.command(() => { this.page.frame.goBack() }) }
+  /** Delegate Forward to the page's navigation provider. */
+  goForward(): void { this.command(() => { this.page.frame.goForward() }) }
+  /** Delegate Reload to the page's navigation provider. */
+  reload(): void { this.command(() => { this.page.frame.reload() }) }
+
+  /** @param enabled - optional embedding-sandbox control; unavailable providers remain unchanged. */
+  setSandbox(enabled: boolean): void {
+    const sandbox = this.page.frame.sandbox
+    if (sandbox !== undefined) this.command(() => { sandbox.setEnabled(enabled) })
   }
 
-  /** Move to the following application-known address when Web history remains usable. */
-  goForward(): void {
-    if (this.disposed) return
-    const request = this.navigation.forward()
-    if (request !== undefined) this.start(request)
-  }
+  /** @param actions - writer from a replacement Session presentation binding. */
+  rebind(actions: BoundActions<BrowserStore>): void { this.actions = actions }
 
-  /** Reload the last application-known address without adding history. */
-  reload(): void {
-    if (this.disposed) return
-    const request = this.navigation.reload()
-    if (request !== undefined) this.start(request)
-  }
-
-  private start(request: NonNullable<BrowserTabState['request']>): void {
-    this.publish()
-    this.frame.clearDocument()
-    this.frame.setDocument({ target: request.target, src: request.target.url, revision: request.revision })
-  }
-
-  private frameLoaded(revision: number): void {
-    if (this.disposed) return
-    const previous = this.navigation.snapshot
-    this.navigation.frameLoaded(revision)
-    if (this.navigation.snapshot !== previous) this.publish()
-  }
-
-  private publish(): void {
-    this.options.actions.replace(this.options.tabId, this.navigation.snapshot)
-  }
-
-  private dispose(): void {
+  /** @returns after page teardown; repeated callers join the same disposal. */
+  dispose(): Promise<void> {
+    if (this.disposal !== undefined) return this.disposal
     this.disposed = true
-    this.frame.clearDocument()
+    this.options.signal.removeEventListener('abort', this.abort)
+    this.unsubscribe()
+    this.disposal = this.page.frame.dispose()
+    return this.disposal
+  }
+
+  private publishSaved(): void {
+    if (this.checkpoint !== undefined) this.actions.replace(this.options.tabId, this.checkpoint)
+  }
+
+  private addressFailed(reason: BrowserAddressFailure): void {
+    this.store.set({ ...this.store.getSnapshot(), addressFailure: reason })
+  }
+
+  private command(run: () => void): void {
+    if (this.disposed) return
+    const current = this.store.getSnapshot()
+    this.store.set({ ...current, addressFailure: undefined, addressRevision: current.addressRevision + 1 })
+    run()
   }
 }
 
-/** Browser commands and keyed frame state injected into the tab body. */
+/** Values available once a Sidebar body has committed its content container. */
+export interface BrowserMountRequest {
+  readonly tabId: TabId
+  readonly signal: AbortSignal
+  readonly viewportId: string
+  readonly applicationOrigin: string
+  readonly initial: BrowserTabState | undefined
+  readonly initialUrl: string | undefined
+  readonly openTab: (url: string) => void
+}
+
+/** Plain Slot callbacks and a framework-bound state source, not a desktop protocol. */
 export interface BrowserInjected {
   readonly keyedHooks: {
-    readonly browserFrame: (key: string) => HostObservable<BrowserFrameState> | undefined
+    readonly browserState: (key: string) => HostObservable<BrowserControllerState> | undefined
   }
-  /**
-   * @param tabId - tab occurrence.
-   * @param signal - occurrence lifetime.
-   * @param applicationOrigin - current application origin.
-   * @param initial - persisted tab state.
-   */
-  mount(tabId: TabId, signal: AbortSignal, applicationOrigin: string, initial?: BrowserTabState): void
-  /** @param tabId - tab occurrence. @param value - address-bar or typed-open value. */
+  /** @param request - committed tab and container. @returns ends physical attachment without closing the tab. */
+  mount(request: BrowserMountRequest): () => void
+  /** @returns after every page has been disposed. */
+  dispose(): Promise<void>
+  /** @param actions - writer from a recreated Session binding. */
+  rebind(actions: BoundActions<BrowserStore>): void
+  /** @param tabId - owning tab. @param value - address input. */
   loadUrl(tabId: TabId, value: string): void
-  /** @param tabId - tab occurrence. */
+  /** @param tabId - owning tab. */
   goBack(tabId: TabId): void
-  /** @param tabId - tab occurrence. */
+  /** @param tabId - owning tab. */
   goForward(tabId: TabId): void
-  /** @param tabId - tab occurrence. */
+  /** @param tabId - owning tab. */
   reload(tabId: TabId): void
-  /** @param tabId - tab occurrence. */
-  toggleSandbox(tabId: TabId): void
-  /** @param tabId - tab occurrence. @param revision - rendered document revision. */
-  reportLoaded(tabId: TabId, revision: number): void
-  /** @param tabId - tab occurrence. @param revision - rendered document revision that emitted `error`. */
-  reportLoadFailed(tabId: TabId, revision: number): void
+  /** @param tabId - owning tab. @param enabled - provider's optional sandbox control. */
+  setSandbox(tabId: TabId, enabled: boolean): void
 }
 
-/**
- * Bind Browser controllers to one Session and its persistence writer.
- * @param actions - Browser store mutation face.
- * @returns a per-tab controller registry exposed as plain Slot callbacks.
- */
-export function createBrowserControllers(
-  actions: BoundActions<BrowserStore>,
-): BrowserInjected {
-  const controllers = new Map<TabId, { readonly signal: AbortSignal; readonly controller: BrowserController }>()
-  const controller = (tabId: TabId): BrowserController | undefined => controllers.get(tabId)?.controller
+/** @param actions - persisted view-state writer. @param createPage - composition-selected provider. @returns tab callbacks. */
+export function createBrowserControllers(actions: BoundActions<BrowserStore>, createPage: BrowserPageFactory): BrowserInjected {
+  let currentActions = actions
+  const controllers = new Map<TabId, {
+    readonly signal: AbortSignal
+    readonly controller: BrowserController
+    readonly forget: () => void
+  }>()
+  const controller = (id: TabId): BrowserController | undefined => controllers.get(id)?.controller
   return {
-    keyedHooks: { browserFrame: key => controller(key as TabId)?.frame },
-    mount(tabId, signal, applicationOrigin, initial) {
-      const held = controllers.get(tabId)
-      if (held?.signal === signal) return
-      const created = new BrowserController({
-        tabId, signal, applicationOrigin, actions,
-        ...(initial === undefined ? {} : { initial }),
-      })
-      controllers.set(tabId, { signal, controller: created })
-      signal.addEventListener('abort', () => {
-        if (controllers.get(tabId)?.controller !== created) return
-        controllers.delete(tabId)
-        actions.forget(tabId)
-      }, { once: true })
+    keyedHooks: { browserState: key => controller(key as TabId) },
+    mount(request) {
+      const { tabId, signal } = request
+      if (signal.aborted) return () => {}
+      let held = controllers.get(tabId)
+      if (held?.signal !== signal) {
+        if (held !== undefined) {
+          held.signal.removeEventListener('abort', held.forget)
+          void held.controller.dispose()
+        }
+        const created = new BrowserController({ ...request, actions: currentActions, createPage })
+        const forget = (): void => {
+          if (controllers.get(tabId)?.controller !== created) return
+          controllers.delete(tabId)
+          currentActions.forget(tabId)
+        }
+        held = { signal, controller: created, forget }
+        controllers.set(tabId, held)
+        signal.addEventListener('abort', forget, { once: true })
+      }
+      const hide = held.controller.mount(request.viewportId)
+      held.controller.start(request.initialUrl)
+      return hide
     },
-    loadUrl: (tabId, value) => { controller(tabId)?.loadUrl(value) },
-    goBack: (tabId) => { controller(tabId)?.goBack() },
-    goForward: (tabId) => { controller(tabId)?.goForward() },
-    reload: (tabId) => { controller(tabId)?.reload() },
-    toggleSandbox: (tabId) => { controller(tabId)?.frame.toggleSandbox() },
-    reportLoaded: (tabId, revision) => { controller(tabId)?.frame.reportLoaded(revision) },
-    reportLoadFailed: (tabId, revision) => { controller(tabId)?.frame.reportLoadFailed(revision) },
+    dispose: async () => {
+      const pending = [...controllers.values()].map(({ signal, controller, forget }) => {
+        signal.removeEventListener('abort', forget)
+        return controller.dispose()
+      })
+      controllers.clear()
+      await Promise.all(pending)
+    },
+    rebind: actions => {
+      currentActions = actions
+      for (const { controller } of controllers.values()) controller.rebind(actions)
+    },
+    loadUrl: (id, value) => { controller(id)?.loadUrl(value) },
+    goBack: id => { controller(id)?.goBack() },
+    goForward: id => { controller(id)?.goForward() },
+    reload: id => { controller(id)?.reload() },
+    setSandbox: (id, enabled) => { controller(id)?.setSandbox(enabled) },
   }
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
index f26b983050..54a7405009 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
@@ -1,98 +1,48 @@
-/** BrowserFrame interface and the current iframe implementation. */
-import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
-import type { SnapshotStore } from '@deepseek-ai/dsh-client-store'
+/** Carrier-neutral page navigation and observable state. */
 import type { HostObservable } from '@deepseek-ai/dsh-client-ui-slots'
 import type { BrowserTarget } from './url.ts'
 
-/** One prepared document rendered by a BrowserFrame implementation. */
-export interface BrowserDocument {
-  readonly target: BrowserTarget
-  readonly src: string
-  readonly revision: number
+/** A loading failure, optionally carrying the underlying browser's diagnostic. */
+export interface BrowserLoadError {
+  readonly code: number | undefined
+  readonly description: string | undefined
 }
 
-/** Current renderer-facing state for one Browser tab. */
+/** State consumed by common browser chrome, without DOM or carrier identifiers. */
 export interface BrowserFrameState {
-  readonly document: BrowserDocument | undefined
-  readonly sandboxed: boolean
-  readonly loadFailed: boolean
+  readonly target: BrowserTarget | undefined
+  readonly address: 'empty' | 'requested' | 'observed' | 'unknown'
+  readonly loading: boolean
+  readonly canGoBack: boolean
+  readonly canGoForward: boolean
+  readonly error: BrowserLoadError | undefined
+  /** Undefined when this provider does not expose a sandbox control. */
+  readonly sandboxEnabled: boolean | undefined
 }
 
-/** Browser rendering operations shared by Web and future Electron implementations. */
+/** Optional iframe policy control, not an Electron process-sandbox switch. */
+export interface BrowserSandboxControl {
+  /** @param enabled - whether the provider's embedding sandbox is enforced. */
+  setEnabled(enabled: boolean): void
+}
+
+/** Navigation owns page lifetime; mounting and hiding belong to BrowserPresentation. */
 export interface BrowserFrame extends HostObservable<BrowserFrameState> {
-  /** Toggle sandbox enforcement for this tab occurrence. */
-  toggleSandbox(): void
-  /** @param document - current prepared document. */
-  setDocument(document: BrowserDocument): void
-  /** Remove the current prepared document. */
-  clearDocument(): void
-  /** @param revision - rendered document revision reported by the carrier. */
-  reportLoaded(revision: number): void
-  /** @param revision - rendered document revision whose carrier reported an error. */
-  reportLoadFailed(revision: number): void
+  readonly sandbox?: BrowserSandboxControl
+  /** @param target - validated HTTP(S) address; loading failures are published in state. */
+  loadUrl(target: BrowserTarget): void
+  /** Move backward when the provider reports an available entry. */
+  goBack(): void
+  /** Move forward when the provider reports an available entry. */
+  goForward(): void
+  /** Reload the current address without creating a new history entry. */
+  reload(): void
+  /** @returns after the page, listeners and pending initialization have been released; repeated calls join disposal. */
+  dispose(): Promise<void>
 }
 
-/** Owns transient iframe and sandbox-toggle state independently from URL navigation. */
-export class IframeImpl implements BrowserFrame {
-  private readonly store: SnapshotStore<BrowserFrameState> = createSnapshotStore({
-    document: undefined,
-    sandboxed: true,
-    loadFailed: false,
-  })
-
-  /**
-   * @param sandboxChanged - applies the new policy to the current controlled target.
-   * @param documentLoaded - reports an iframe load to the navigation state machine.
-   */
-  constructor(
-    private readonly sandboxChanged: (sandboxed: boolean) => void,
-    private readonly documentLoaded: (revision: number) => void,
-  ) {}
-
-  /** @returns the immutable renderer snapshot. */
-  getSnapshot = (): BrowserFrameState => this.store.getSnapshot()
-
-  /**
-   * Subscribe to iframe or sandbox-mode changes.
-   * @param listener - invalidation callback.
-   * @returns the unsubscribe function.
-   */
-  subscribe = (listener: () => void): (() => void) => this.store.subscribe(listener)
-
-  /** Toggle sandbox enforcement for this tab occurrence. */
-  toggleSandbox(): void {
-    const current = this.store.getSnapshot()
-    const sandboxed = !current.sandboxed
-    this.store.set({ ...current, sandboxed })
-    this.sandboxChanged(sandboxed)
-  }
-
-  /**
-   * Publish a prepared frame from the owning controller.
-   * @param document - current prepared document.
-   */
-  setDocument(document: BrowserDocument): void {
-    this.store.set({ ...this.store.getSnapshot(), document, loadFailed: false })
-  }
-
-  /** Remove the current prepared frame and transient load failure. */
-  clearDocument(): void {
-    const current = this.store.getSnapshot()
-    const { document } = current
-    if (document !== undefined) {
-      this.store.set({ ...current, document: undefined, loadFailed: false })
-    }
-  }
-
-  /** @param revision - rendered document revision reported by the iframe. */
-  reportLoaded(revision: number): void {
-    this.documentLoaded(revision)
-  }
-
-  /** @param revision - rendered document revision whose iframe emitted `error`. */
-  reportLoadFailed(revision: number): void {
-    const current = this.store.getSnapshot()
-    if (current.document?.revision !== revision || current.loadFailed) return
-    this.store.set({ ...current, loadFailed: true })
-  }
+/** @returns state before any page has been requested. */
+export function emptyBrowserFrame(): BrowserFrameState {
+  return { target: undefined, address: 'empty', loading: false, canGoBack: false, canGoForward: false,
+    error: undefined, sandboxEnabled: undefined }
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserNavigation.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserNavigation.ts
index d8f8508a0e..d0401a5a5f 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserNavigation.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserNavigation.ts
@@ -1,33 +1,10 @@
-/** URL, history, and observability state for one Browser tab. */
-import type { BrowserAddressFailure, BrowserTarget } from './url.ts'
+/** Bounded, application-known history used only by the iframe provider. */
+import type { BrowserTarget } from './url.ts'
+import type { BrowserHistoryEntry, BrowserTabState } from './BrowserPersistence.ts'
 
 /** Maximum retained application-known navigation entries per tab. */
 export const MAX_BROWSER_HISTORY = 100
 
-/** One canonical address in the application-managed Web history. */
-export type BrowserHistoryEntry = BrowserTarget
-
-/** Whether the current carrier document still corresponds to an application-known URL. */
-export type BrowserNavigationStatus =
-  | { readonly status: 'empty' }
-  | { readonly status: 'loading'; readonly revision: number }
-  | { readonly status: 'known'; readonly revision: number }
-  | { readonly status: 'unknown'; readonly revision: number }
-
-/** Address-policy or loading failure shown below the toolbar. */
-export type BrowserFailure =
-  { readonly kind: 'address'; readonly reason: BrowserAddressFailure }
-
-/** One Browser tab's serializable URL state. */
-export interface BrowserTabState {
-  readonly entries: readonly BrowserHistoryEntry[]
-  readonly index: number
-  /** Last application-directed load; carrier observations do not rewrite it. */
-  readonly request: { readonly revision: number; readonly target: BrowserTarget } | undefined
-  readonly navigation: BrowserNavigationStatus
-  readonly failure: BrowserFailure | undefined
-}
-
 /**
  * Owns the application-known URL history and the iframe observation state machine.
  * The first load for a request keeps its URL authoritative; another load marks it unknown.
@@ -136,14 +113,6 @@ export class BrowserNavigation {
     return target === undefined ? undefined : this.request(target, this.value)
   }
 
-  /**
-   * Record an invalid address without changing the active document state.
-   * @param reason - parser refusal.
-   */
-  addressFailed(reason: BrowserAddressFailure): void {
-    this.value = { ...this.value, failure: { kind: 'address', reason } }
-  }
-
   /**
    * Record a frame load for its captured revision.
    * @param revision - revision bound to the rendered frame.
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
new file mode 100644
index 0000000000..619af40721
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
@@ -0,0 +1,20 @@
+/** Composition of one navigation provider and its presentation. */
+import type { BrowserPresentation } from '../view/BrowserPresentation.ts'
+import type { BrowserFrame } from './BrowserFrame.ts'
+import type { BrowserTabState } from './BrowserPersistence.ts'
+
+/** Provider construction inputs; persistence does not enter the live navigation interface. */
+export interface BrowserPageOptions {
+  readonly initial: BrowserTabState | undefined
+  readonly persist: (state: BrowserTabState) => void
+  readonly openRequested: (url: string) => void
+}
+
+/** The owning controller disposes frame; UI mounts only presentation. */
+export interface BrowserPage {
+  readonly frame: BrowserFrame
+  readonly presentation: BrowserPresentation
+}
+
+/** Construct a provider without starting navigation or attaching DOM. */
+export type BrowserPageFactory = (options: BrowserPageOptions) => BrowserPage
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
new file mode 100644
index 0000000000..9c592ba9e9
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
@@ -0,0 +1,35 @@
+/** Existing browser-local navigation records, independent from live frame state. */
+import type { BrowserAddressFailure, BrowserTarget } from './url.ts'
+
+/** One retained address. */
+export type BrowserHistoryEntry = BrowserTarget
+
+/** Observability recorded for a controlled navigation. */
+export type BrowserNavigationStatus =
+  | { readonly status: 'empty' }
+  | { readonly status: 'loading'; readonly revision: number }
+  | { readonly status: 'known'; readonly revision: number }
+  | { readonly status: 'unknown'; readonly revision: number }
+
+/** Address refusal carried by existing browser-local records. */
+export type BrowserFailure = { readonly kind: 'address'; readonly reason: BrowserAddressFailure }
+
+/** Serializable record; providers retain the history they can restore. */
+export interface BrowserTabState {
+  readonly entries: readonly BrowserHistoryEntry[]
+  readonly index: number
+  readonly request: { readonly revision: number; readonly target: BrowserTarget } | undefined
+  readonly navigation: BrowserNavigationStatus
+  readonly failure: BrowserFailure | undefined
+}
+
+/** @param state - saved navigation. @returns its last selected address, if any. */
+export function currentBrowserTarget(state: BrowserTabState | undefined): BrowserTarget | undefined {
+  return state === undefined || state.index < 0 ? undefined : state.entries[state.index]
+}
+
+/** @param target - current address. @param revision - navigation generation. @returns an address-only checkpoint. */
+export function browserAddressCheckpoint(target: BrowserTarget, revision: number): BrowserTabState {
+  return { entries: [target], index: 0, request: { target, revision },
+    navigation: { status: 'known', revision }, failure: undefined }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
new file mode 100644
index 0000000000..ef135250b2
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
@@ -0,0 +1,266 @@
+/** Electron navigation and guest lifetime, independent from DOM placement. */
+import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../../desktop.ts'
+import type { ElectronWebviewPresentation, WebviewElement } from '../view/ElectronWebviewPresentation.ts'
+import { emptyBrowserFrame, type BrowserFrame, type BrowserFrameState, type BrowserLoadError } from './BrowserFrame.ts'
+import type { BrowserPageOptions } from './BrowserPage.ts'
+import { browserAddressCheckpoint, currentBrowserTarget } from './BrowserPersistence.ts'
+import { parseBrowserAddress, type BrowserTarget } from './url.ts'
+
+interface NavigationEvent extends Event { readonly isMainFrame: boolean }
+interface LoadFailureEvent extends NavigationEvent {
+  readonly errorCode: number
+  readonly errorDescription: string
+}
+
+/** Owns native history and translates Electron observations into common frame state. */
+export class ElectronWebViewImpl implements BrowserFrame {
+  private readonly store: SnapshotStore<BrowserFrameState>
+  private readonly lifetime = new AbortController()
+  private guestLifetime: AbortController | undefined
+  private element: WebviewElement | undefined
+  private lease: DesktopBrowserLeaseId | undefined
+  private workspaceKey: string | undefined
+  private initializing: Promise<void> | undefined
+  private ready = false
+  private pending: BrowserTarget | undefined
+  private revision = 0
+  private firstDocument = true
+  private checkpoint: BrowserTarget | undefined
+  private disposal: Promise<void> | undefined
+  private attachment: AbortController | undefined
+  private readonly releases = new Set<Promise<void>>()
+
+  /**
+   * @param options - saved address, persistence and source-tab opening callback.
+   * @param bridge - main-process guest operations.
+   * @param workspace - resolves the storage account once for this frame lifetime.
+   * @param presentation - tag and Sidebar placement adapter.
+   */
+  constructor(private readonly options: BrowserPageOptions, private readonly bridge: DesktopBrowserBridge,
+    private readonly workspace: (signal: AbortSignal) => Promise<string>,
+    private readonly presentation: ElectronWebviewPresentation) {
+    const target = currentBrowserTarget(options.initial)
+    this.checkpoint = target
+    this.store = createSnapshotStore({ ...emptyBrowserFrame(), target, address: target === undefined ? 'empty' : 'requested' })
+  }
+
+  /** @returns immutable carrier-neutral navigation state. */
+  getSnapshot = (): BrowserFrameState => this.store.getSnapshot()
+  /** @param listener - state invalidation. @returns unsubscribe callback. */
+  subscribe = (listener: () => void): (() => void) => this.store.subscribe(listener)
+
+  /** A physical mount may recreate a lost guest; ordinary Sidebar hiding never calls this. */
+  attach(): void {
+    if (this.lifetime.signal.aborted) return
+    this.attachment = new AbortController()
+    this.pending ??= this.store.getSnapshot().target
+    if (this.pending !== undefined) {
+      this.store.set({ ...this.store.getSnapshot(), address: 'requested', loading: true,
+        canGoBack: false, canGoForward: false, error: undefined })
+      this.initialize()
+    }
+  }
+
+  /** Invalidate pending attachment before the containing DOM is removed. */
+  detach(): void {
+    this.attachment?.abort()
+    this.attachment = undefined
+    this.pending = this.store.getSnapshot().target
+    void this.dropGuest()
+  }
+
+  /** @param target - validated address, loaded without replacing the guest. */
+  loadUrl(target: BrowserTarget): void {
+    if (this.lifetime.signal.aborted) return
+    const current = this.store.getSnapshot()
+    if (this.ready && current.address === 'observed' && current.target?.url === target.url) {
+      this.reload()
+      return
+    }
+    this.revision++
+    this.pending = target
+    this.store.set({ ...current, target, address: 'requested', loading: true, error: undefined })
+    this.persist(target)
+    if (this.ready) this.loadPending()
+    else this.initialize()
+  }
+
+  /** Move backward through Chromium history. */
+  goBack(): void {
+    if (this.store.getSnapshot().canGoBack) this.navigate('goBack')
+  }
+
+  /** Move forward through Chromium history. */
+  goForward(): void {
+    if (this.store.getSnapshot().canGoForward) this.navigate('goForward')
+  }
+
+  /** Reload the actual current page, or retry failed guest creation. */
+  reload(): void {
+    const current = this.store.getSnapshot()
+    if (this.lifetime.signal.aborted || current.target === undefined) return
+    if (!this.ready || current.error !== undefined) {
+      this.revision++
+      this.pending = current.target
+      this.store.set({ ...current, loading: true, error: undefined })
+      if (this.ready) this.loadPending()
+      else this.initialize()
+    } else this.navigate('reload')
+  }
+
+  /** @returns after pending initialization and the owned guest have been released. */
+  dispose(): Promise<void> {
+    if (this.disposal !== undefined) return this.disposal
+    this.lifetime.abort()
+    this.pending = undefined
+    this.disposal = Promise.all([this.dropGuest(), this.initializing])
+      .then(() => Promise.all(this.releases)).then(() => {})
+    this.presentation.dispose()
+    return this.disposal
+  }
+
+  private navigate(command: 'goBack' | 'goForward' | 'reload'): void {
+    if (this.lifetime.signal.aborted || !this.ready || this.element === undefined) return
+    this.revision++
+    this.pending = undefined
+    this.store.set({ ...this.store.getSnapshot(), loading: true, error: undefined })
+    try { this.element[command]() }
+    catch (error) { this.commandFailed(error) }
+  }
+
+  private initialize(): void {
+    const attachment = this.attachment
+    if (attachment === undefined || this.initializing !== undefined || this.element !== undefined || this.lifetime.signal.aborted) return
+    const signal = AbortSignal.any([this.lifetime.signal, attachment.signal])
+    this.initializing = this.createGuest(signal).catch(async (error: unknown) => {
+      await this.dropGuest()
+      if (!signal.aborted) this.commandFailed(error)
+    }).finally(() => {
+      this.initializing = undefined
+      if (this.attachment !== attachment && this.pending !== undefined) this.initialize()
+    })
+  }
+
+  private async createGuest(attachmentSignal: AbortSignal): Promise<void> {
+    this.workspaceKey ??= await this.workspace(attachmentSignal)
+    if (attachmentSignal.aborted) return
+    const reservation = await this.bridge.acquire(this.workspaceKey)
+    if (attachmentSignal.aborted) { await this.release(reservation.lease); return }
+    this.lease = reservation.lease
+    this.guestLifetime = new AbortController()
+    const signal = AbortSignal.any([attachmentSignal, this.guestLifetime.signal])
+    const element = this.presentation.createElement(reservation)
+    this.element = element
+    const unsubscribeOpen = this.bridge.onOpenRequested(reservation.lease, url => {
+      if (this.element === element && !signal.aborted) this.options.openRequested(url)
+    })
+    signal.addEventListener('abort', unsubscribeOpen, { once: true })
+    element.addEventListener('dom-ready', () => {
+      this.ready = true
+      this.observe(this.store.getSnapshot().address !== 'requested')
+      this.loadPending()
+    }, { signal })
+    element.addEventListener('did-navigate', () => { this.observe(true) }, { signal })
+    element.addEventListener('did-navigate-in-page', event => {
+      if ((event as NavigationEvent).isMainFrame) this.observe(true)
+    }, { signal })
+    for (const name of ['did-start-loading', 'did-stop-loading', 'page-title-updated']) {
+      element.addEventListener(name, () => {
+        this.observe(name === 'page-title-updated' && this.store.getSnapshot().address === 'observed')
+      }, { signal })
+    }
+    element.addEventListener('did-fail-load', event => {
+      const failure = event as LoadFailureEvent
+      if (failure.isMainFrame && failure.errorCode !== -3) {
+        this.failed({ code: failure.errorCode, description: failure.errorDescription })
+      }
+    }, { signal })
+    for (const name of ['render-process-gone', 'destroyed']) {
+      element.addEventListener(name, () => { void this.dropGuest(); this.failed() }, { signal })
+    }
+    this.presentation.present(element)
+  }
+
+  private loadPending(): void {
+    const target = this.pending
+    const element = this.element
+    if (!this.ready || target === undefined || element === undefined) return
+    const revision = this.revision
+    this.pending = undefined
+    void element.loadURL(target.url).catch((error: unknown) => {
+      if (this.element !== element || this.lifetime.signal.aborted || this.revision !== revision) return
+      if (typeof error === 'object' && error !== null && 'code' in error && error.code === 'ERR_ABORTED') return
+      if (this.store.getSnapshot().error === undefined) this.commandFailed(error)
+    })
+  }
+
+  private observe(committed: boolean): void {
+    if (!this.ready || this.element === undefined || this.lifetime.signal.aborted) return
+    try { this.observeReady(this.element, committed) }
+    catch (error) { this.commandFailed(error) }
+  }
+
+  private observeReady(element: WebviewElement, committed: boolean): void {
+    const current = this.store.getSnapshot()
+    const parsed = committed ? parseBrowserAddress(element.getURL()) : undefined
+    if (parsed?.ok && this.firstDocument) {
+      // The lease-bearing bootstrap document is not a user history entry.
+      element.clearHistory()
+      this.firstDocument = false
+    }
+    let target = current.target
+    let address = current.address
+    if (parsed?.ok) {
+      target = { ...parsed.target, title: element.getTitle() || parsed.target.title }
+      address = 'observed'
+      this.presentation.show(target.title)
+    }
+    const loading = current.error === undefined && element.isLoading()
+    const canGoBack = element.canGoBack()
+    const canGoForward = element.canGoForward()
+    if (target?.url !== current.target?.url || target?.title !== current.target?.title || address !== current.address
+      || loading !== current.loading || canGoBack !== current.canGoBack || canGoForward !== current.canGoForward) {
+      this.store.set({ ...current, target, address, loading, canGoBack, canGoForward })
+    }
+    if (parsed?.ok && target !== undefined) this.persist(target)
+  }
+
+  private persist(target: BrowserTarget): void {
+    if (target.url === this.checkpoint?.url && target.title === this.checkpoint.title) return
+    this.checkpoint = target
+    this.options.persist(browserAddressCheckpoint(target, this.revision))
+  }
+
+  private failed(error: BrowserLoadError = { code: undefined, description: undefined }): void {
+    if (this.lifetime.signal.aborted) return
+    const current = this.store.getSnapshot()
+    this.store.set({ ...current, loading: false, error,
+      canGoBack: this.ready && current.canGoBack, canGoForward: this.ready && current.canGoForward })
+  }
+
+  private commandFailed(error: unknown): void {
+    console.error('Desktop browser operation failed', error)
+    this.failed()
+  }
+
+  private dropGuest(): Promise<void> {
+    this.guestLifetime?.abort()
+    this.guestLifetime = undefined
+    this.presentation.clear()
+    this.element = undefined
+    this.ready = false
+    this.firstDocument = true
+    const lease = this.lease
+    this.lease = undefined
+    return lease === undefined ? Promise.resolve() : this.release(lease)
+  }
+
+  private release(lease: DesktopBrowserLeaseId): Promise<void> {
+    const released = this.bridge.release(lease)
+      .catch((error: unknown) => { console.error('Desktop browser guest release failed', error) })
+      .finally(() => { this.releases.delete(released) })
+    this.releases.add(released)
+    return released
+  }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
new file mode 100644
index 0000000000..01dbb94bb8
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -0,0 +1,96 @@
+/** Iframe navigation provider with bounded application-known history. */
+import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
+import type { IframePresentation } from '../view/IframePresentation.ts'
+import type { BrowserFrame, BrowserFrameState, BrowserLoadError, BrowserSandboxControl } from './BrowserFrame.ts'
+import type { BrowserPageOptions } from './BrowserPage.ts'
+import { BrowserNavigation } from './BrowserNavigation.ts'
+import type { BrowserTarget } from './url.ts'
+
+/** Owns iframe navigation; the view reports loads without reading cross-origin content. */
+export class IframeImpl implements BrowserFrame {
+  readonly sandbox: BrowserSandboxControl = { setEnabled: enabled => { this.setSandbox(enabled) } }
+  private readonly navigation: BrowserNavigation
+  private readonly store: SnapshotStore<BrowserFrameState>
+  private sandboxed = true
+  private error: BrowserLoadError | undefined
+  private disposed = false
+  private disposal: Promise<void> | undefined
+
+  /** @param options - initial checkpoint and persistence writer. @param presentation - iframe DOM adapter. */
+  constructor(private readonly options: BrowserPageOptions, private readonly presentation: IframePresentation) {
+    this.navigation = new BrowserNavigation(options.initial)
+    this.store = createSnapshotStore(this.snapshot())
+  }
+
+  /** @param revision - document generation whose iframe emitted load. */
+  handleLoaded(revision: number): void {
+    if (this.disposed) return
+    this.navigation.frameLoaded(revision)
+    this.publish()
+  }
+
+  /** @param revision - document generation whose iframe reported failure. */
+  handleLoadFailed(revision: number): void {
+    if (this.disposed || this.navigation.snapshot.request?.revision !== revision) return
+    this.error = { code: undefined, description: undefined }
+    this.publish()
+  }
+
+  /** @returns immutable navigation state. */
+  getSnapshot = (): BrowserFrameState => this.store.getSnapshot()
+  /** @param listener - state invalidation. @returns unsubscribe callback. */
+  subscribe = (listener: () => void): (() => void) => this.store.subscribe(listener)
+
+  /** @param target - validated address; submitting the current address reloads it. */
+  loadUrl(target: BrowserTarget): void {
+    if (this.disposed) return
+    const request = BrowserNavigation.current(this.navigation.snapshot)?.url === target.url
+      ? this.navigation.reload() : this.navigation.navigate(target)
+    this.load(request)
+  }
+
+  /** Move through application-known history while the iframe address remains known. */
+  goBack(): void { if (!this.disposed) this.load(this.navigation.back()) }
+  /** Move through application-known history while the iframe address remains known. */
+  goForward(): void { if (!this.disposed) this.load(this.navigation.forward()) }
+  /** Reload the last application-known address. */
+  reload(): void { if (!this.disposed) this.load(this.navigation.reload()) }
+
+  /** @returns after the presentation has been removed; repeated calls join disposal. */
+  dispose(): Promise<void> {
+    if (this.disposal !== undefined) return this.disposal
+    this.disposed = true
+    this.presentation.dispose()
+    this.disposal = Promise.resolve()
+    return this.disposal
+  }
+
+  private setSandbox(enabled: boolean): void {
+    if (this.disposed || enabled === this.sandboxed) return
+    this.sandboxed = enabled
+    const request = this.navigation.reload()
+    if (request === undefined) this.publish()
+    else this.load(request)
+  }
+
+  private load(request: ReturnType<BrowserNavigation['navigate']> | undefined): void {
+    if (request === undefined) return
+    this.error = undefined
+    this.publish()
+    this.presentation.show({ target: request.target, revision: request.revision, sandboxed: this.sandboxed })
+  }
+
+  private snapshot(): BrowserFrameState {
+    const state = this.navigation.snapshot
+    const target = BrowserNavigation.current(state)
+    return { target, address: target === undefined ? 'empty' : state.navigation.status === 'unknown' ? 'unknown' : 'requested',
+      loading: state.navigation.status === 'loading' && this.error === undefined,
+      canGoBack: this.navigation.canGoBack, canGoForward: this.navigation.canGoForward,
+      error: this.error, sandboxEnabled: this.sandboxed }
+  }
+
+  private publish(): void {
+    this.store.set(this.snapshot())
+    this.options.persist(this.navigation.snapshot)
+  }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/store.ts b/packages/client/ui-sidebar-browser/src/client/browser/store.ts
index 4702f7c7c1..cd0c38aa04 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/store.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/store.ts
@@ -1,7 +1,7 @@
 /** Persisted Browser tab snapshots shared by the body and title slots. */
 import { defineStore, type EngineStoreHandle } from '@deepseek-ai/dsh-client-store'
 import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
-import type { BrowserTabState } from './BrowserNavigation.ts'
+import type { BrowserTabState } from './BrowserPersistence.ts'
 
 /** All Browser tabs in one Session-scoped store. */
 export interface BrowserState {
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
new file mode 100644
index 0000000000..27a0c160a1
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
@@ -0,0 +1,28 @@
+/** Resolve browser storage only after the authoritative Workspace list has arrived. */
+import type { WorkspaceSource } from '@deepseek-ai/dsh-api-workspace-controller/client'
+
+/**
+ * Resolve the workspace account; ungrouped Sessions get separate accounts.
+ * @param source - authoritative Workspace membership.
+ * @param sessionId - owning DSH Session.
+ * @param signal - guest initialization lifetime.
+ * @returns the storage account for this occurrence.
+ */
+export async function browserWorkspace(source: WorkspaceSource, sessionId: string, signal: AbortSignal): Promise<string> {
+  signal.throwIfAborted()
+  if (source.getSnapshot().phase !== 'ready') {
+    await new Promise<void>((resolve, reject) => {
+      const abort = (): void => { stop(); reject(signal.reason) }
+      const stop = source.subscribe(() => {
+        if (source.getSnapshot().phase !== 'ready') return
+        stop()
+        signal.removeEventListener('abort', abort)
+        resolve()
+      })
+      signal.addEventListener('abort', abort, { once: true })
+    })
+  }
+  signal.throwIfAborted()
+  const workspace = source.getSnapshot().items.find(item => item.sessionIds.some(id => id === sessionId))
+  return workspace === undefined ? `session:${sessionId}` : `workspace:${workspace.workspaceId}`
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/index.ts b/packages/client/ui-sidebar-browser/src/client/index.ts
index 8a301255ba..3f65a97b04 100644
--- a/packages/client/ui-sidebar-browser/src/client/index.ts
+++ b/packages/client/ui-sidebar-browser/src/client/index.ts
@@ -4,17 +4,25 @@ import type {} from '@deepseek-ai/dsh-client-locale/client'
 import type {} from '@deepseek-ai/dsh-client-ui-renderer/client'
 import type {} from '@deepseek-ai/dsh-client-ui-session/client'
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar-right/client'
-import { BrowserBody } from './view/BrowserBody.tsx'
+import type {} from '@deepseek-ai/dsh-api-workspace-controller/client'
+import { BrowserBody, type BrowserBodyProps } from './view/BrowserBody.tsx'
 import { BrowserTitle } from './view/BrowserTitle.tsx'
 import { createBrowserControllers } from './browser/BrowserController.ts'
+import type { BrowserInjected } from './browser/BrowserController.ts'
+import { createElectronPage, createIframePage } from './pages.ts'
+import type { DesktopBrowserBridge } from '../desktop.ts'
+import { browserWorkspace } from './browser/workspace.ts'
+import type { BrowserPageFactory } from './browser/BrowserPage.ts'
 import { BROWSER_ID, browserDefinition } from './definition.tsx'
 import { en, zh } from './locales.ts'
 import { createBrowserStore } from './browser/store.ts'
 
 export type { BrowserBodyProps } from './view/BrowserBody.tsx'
-export type { BrowserInjected } from './browser/BrowserController.ts'
-export type { BrowserDocument, BrowserFrame, BrowserFrameState } from './browser/BrowserFrame.ts'
-export type { BrowserFailure, BrowserHistoryEntry, BrowserNavigationStatus, BrowserTabState } from './browser/BrowserNavigation.ts'
+export type { BrowserControllerState, BrowserInjected, BrowserMountRequest } from './browser/BrowserController.ts'
+export type { BrowserFrame, BrowserFrameState, BrowserLoadError, BrowserSandboxControl } from './browser/BrowserFrame.ts'
+export type { BrowserPage, BrowserPageFactory, BrowserPageOptions } from './browser/BrowserPage.ts'
+export type { BrowserPresentation } from './view/BrowserPresentation.ts'
+export type { BrowserFailure, BrowserHistoryEntry, BrowserNavigationStatus, BrowserTabState } from './browser/BrowserPersistence.ts'
 export type { SidebarBrowserKey } from './locales.ts'
 export type { BrowserState } from './browser/store.ts'
 export type { BrowserAddressFailure, BrowserAddressResult, BrowserTarget } from './browser/url.ts'
@@ -34,12 +42,38 @@ export function apply(ctx: Context): void {
   const namespace = 'sidebarBrowser'
   const t = ctx.locale.bind(namespace)
   const store = createBrowserStore()
+  const carrier = (globalThis as typeof globalThis & {
+    dshDesktop?: { readonly protocolVersion: number; readonly browser?: DesktopBrowserBridge }
+  }).dshDesktop
+  const desktop = carrier?.protocolVersion === 1 ? carrier.browser : undefined
   ctx.effect(() => ctx.locale.register(namespace, { zh, en }), 'ui-sidebar-browser.copy')
-  ctx.effect(() => ctx.sidebarRightTabs.register(browserDefinition(t)), 'ui-sidebar-browser.type')
-  ctx.effect(() => ctx.slots.inject('sidebar.right.pane.tab', () => ctx.slots.register({
-    name: 'sidebar.right.pane.tab', key: BROWSER_ID, locale: namespace, store,
-    inject: (_sessionId, actions) => createBrowserControllers(actions),
-  }, BrowserBody)), 'ui-sidebar-browser.body')
+  ctx.effect(() => ctx.sidebarRightTabs.register({ ...browserDefinition(t), keepMounted: desktop !== undefined }), 'ui-sidebar-browser.type')
+  const installFrames = (scope: Context, factory: (sessionId: BrowserBodyProps['sessionId']) => BrowserPageFactory): void => {
+    const controllers = new Map<BrowserBodyProps['sessionId'], BrowserInjected>()
+    scope.effect(() => async () => {
+      const pending = [...controllers.values()].map(controller => controller.dispose())
+      controllers.clear()
+      await Promise.all(pending)
+    }, 'ui-sidebar-browser.frames')
+    scope.effect(() => scope.slots.inject('sidebar.right.pane.tab', () => scope.slots.register({
+      name: 'sidebar.right.pane.tab', key: BROWSER_ID, locale: namespace, store,
+      inject: (sessionId, actions) => {
+        const existing = controllers.get(sessionId)
+        if (existing !== undefined) {
+          existing.rebind(actions)
+          return existing
+        }
+        const controller = createBrowserControllers(actions, factory(sessionId))
+        controllers.set(sessionId, controller)
+        return controller
+      },
+    }, BrowserBody)), 'ui-sidebar-browser.body')
+  }
+  if (desktop === undefined) installFrames(ctx, () => createIframePage)
+  else ctx.inject(['workspaces'], scope => {
+    installFrames(scope, sessionId => options => createElectronPage(options, desktop,
+      signal => browserWorkspace(scope.workspaces.list, sessionId, signal)))
+  })
   ctx.effect(() => ctx.slots.inject('sidebar.right.pane.tab.title', () => ctx.slots.register({
     name: 'sidebar.right.pane.tab.title', key: BROWSER_ID, store,
   }, BrowserTitle)), 'ui-sidebar-browser.title')
diff --git a/packages/client/ui-sidebar-browser/src/client/locales.ts b/packages/client/ui-sidebar-browser/src/client/locales.ts
index 4c551b123e..27fcc3758b 100644
--- a/packages/client/ui-sidebar-browser/src/client/locales.ts
+++ b/packages/client/ui-sidebar-browser/src/client/locales.ts
@@ -20,8 +20,9 @@ export const zh = {
   'error.protocol': '只支持 HTTP 和 HTTPS 地址；本地文件请使用文档预览。',
   'error.credentials': '地址不能包含用户名或密码。',
   'error.application-origin': '不能在嵌入浏览器中打开 DSH 应用自身。',
-  'web.loadFailed': '页面报告加载失败或可能禁止嵌入；可尝试在系统浏览器中打开。',
-  'web.unknown': '页面已在 iframe 内跳转；Web 模式无法读取当前 URL。',
+  'load.failed': '页面加载失败；请刷新重试或在系统浏览器中打开。',
+  'load.failed.detail': '页面加载失败（{code}）：{description}',
+  'address.unknown': '页面已跳转；当前载体无法读取新的 URL。',
 } satisfies Record<string, string>
 
 /** Browser dictionary key union. */
@@ -49,8 +50,9 @@ export const en = {
   'error.protocol': 'Only HTTP and HTTPS addresses are supported; use Document Preview for local files.',
   'error.credentials': 'Addresses cannot contain a username or password.',
   'error.application-origin': 'The embedded browser cannot open the DSH application itself.',
-  'web.loadFailed': 'The page reported a load failure or may block embedding; try opening it in the system browser.',
-  'web.unknown': 'The page navigated inside the iframe; Web mode cannot read its current URL.',
+  'load.failed': 'The page could not load; reload or open it in the system browser.',
+  'load.failed.detail': 'Page load failed ({code}): {description}',
+  'address.unknown': 'The page navigated; this carrier cannot read its new URL.',
 } satisfies Record<SidebarBrowserKey, string>
 
 declare module '@deepseek-ai/dsh-client-ui-slots' {
diff --git a/packages/client/ui-sidebar-browser/src/client/pages.ts b/packages/client/ui-sidebar-browser/src/client/pages.ts
new file mode 100644
index 0000000000..1a69cd6db1
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/pages.ts
@@ -0,0 +1,35 @@
+/** Assemble navigation providers and presentation adapters without platform branches in consumers. */
+import type { DesktopBrowserBridge } from '../desktop.ts'
+import type { BrowserPage, BrowserPageOptions } from './browser/BrowserPage.ts'
+import { IframeImpl } from './browser/IframeImpl.ts'
+import { ElectronWebViewImpl } from './browser/ElectronWebViewImpl.ts'
+import { IframePresentation } from './view/IframePresentation.ts'
+import { ElectronWebviewPresentation } from './view/ElectronWebviewPresentation.ts'
+
+/** @param options - saved navigation and callbacks. @returns the Web page's two independent faces. */
+export function createIframePage(options: BrowserPageOptions): BrowserPage {
+  const presentation = new IframePresentation({
+    loaded: revision => { frame.handleLoaded(revision) },
+    failed: revision => { frame.handleLoadFailed(revision) },
+    remounted: () => { frame.reload() },
+  })
+  const frame = new IframeImpl(options, presentation)
+  return { frame, presentation }
+}
+
+/**
+ * @param options - checkpoint and source-tab callbacks.
+ * @param bridge - desktop-only transport.
+ * @param workspace - storage account resolver.
+ * @returns separate navigation and presentation faces.
+ */
+export function createElectronPage(options: BrowserPageOptions, bridge: DesktopBrowserBridge,
+  workspace: (signal: AbortSignal) => Promise<string>): BrowserPage {
+  let frame: ElectronWebViewImpl
+  const presentation = new ElectronWebviewPresentation({
+    mounted: () => { frame.attach() },
+    unmounted: () => { frame.detach() },
+  })
+  frame = new ElectronWebViewImpl(options, bridge, workspace, presentation)
+  return { frame, presentation }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
index 0914d8e6f5..afbcf3f0ca 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
+++ b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
@@ -121,6 +121,44 @@
   background: var(--dsw-alias-bg-base);
 }
 
+.content {
+  position: relative;
+  display: flex;
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 0;
+}
+
+.viewport {
+  display: flex;
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 0;
+}
+
+.placeholder {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  pointer-events: none;
+}
+
+.webview {
+  display: flex;
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 0;
+  width: 100%;
+  height: 100%;
+  border: 0;
+  -webkit-app-region: no-drag;
+}
+
+/* Native guest input must not consume a docking gesture's window events. */
+:global(html:has([data-dockkit-pointer])) .webview {
+  pointer-events: none;
+}
+
 .start {
   display: flex;
   flex: 1 1 auto;
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
index 5c11a1f374..ac437c2ce8 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
@@ -1,5 +1,5 @@
-/** Browser toolbar and Web iframe renderer. */
-import { useEffect, useRef, useState } from 'react'
+/** Common browser chrome; a presentation adapter attaches the page inside its content container. */
+import { useId, useLayoutEffect, useRef, useState } from 'react'
 import type { FormEvent, ReactNode } from 'react'
 import {
   IconChevronLeftOutlineRegular,
@@ -12,16 +12,12 @@ import {
 } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { InjectFace, PropsLocale, PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
 import type { BrowserInjected } from '../browser/BrowserController.ts'
-import type { BrowserFrameState } from '../browser/BrowserFrame.ts'
-import { BrowserNavigation } from '../browser/BrowserNavigation.ts'
-import type { BrowserAddressFailure } from '../browser/url.ts'
+import { emptyBrowserFrame } from '../browser/BrowserFrame.ts'
+import { currentBrowserTarget } from '../browser/BrowserPersistence.ts'
 import type { BrowserStore } from '../browser/store.ts'
 import css from './Browser.module.css'
 
-/** Fixed Web iframe sandbox; popups escape the sandbox while top navigation remains absent. */
-export const WEB_BROWSER_SANDBOX = 'allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox'
-
-const INITIAL_BROWSER_FRAME: BrowserFrameState = { document: undefined, sandboxed: true, loadFailed: false }
+const EMPTY_FRAME = emptyBrowserFrame()
 
 function SandboxPolicyIcon({ sandboxed }: { readonly sandboxed: boolean }): ReactNode {
   return (
@@ -40,116 +36,85 @@ export type BrowserBodyProps = PropsRuntime<'sidebar.right.pane.tab'>
   & PropsLocale<'sidebarBrowser'>
   & InjectFace<BrowserInjected>
 
-/** Translate one parser refusal without matching display strings in logic. */
-function failureText(reason: BrowserAddressFailure, t: BrowserBodyProps['t']): string {
-  return t(`error.${reason}`)
+function useBrowserDraft(url: string | undefined, revision: number): readonly [string, (value: string) => void] {
+  const [edit, setEdit] = useState<{ readonly revision: number; readonly value: string }>()
+  return [edit?.revision === revision ? edit.value : url ?? '',
+    value => { setEdit({ revision, value }) }]
 }
 
-function useBrowserDraft(
-  controlledUrl: string | undefined,
-  requestId: number | undefined,
-): readonly [string, (value: string) => void] {
-  const [edit, setEdit] = useState<{ readonly requestId: number | undefined; readonly value: string }>()
-  const value = edit !== undefined && edit.requestId === requestId ? edit.value : controlledUrl ?? ''
-  return [value, (draft) => { setEdit({ requestId, value: draft }) }]
-}
-
-/** Browser tab renderer for a controller-owned URL state and Web iframe carrier. */
+/** Render provider-neutral navigation state and optional controls. */
 export function BrowserBody(props: BrowserBodyProps): ReactNode {
-  const {
-    goBack, goForward, loadUrl, mount, reload, reportLoaded, reportLoadFailed, toggleSandbox,
-    useBrowserFrame, useStore, useTabInfo, t,
-  } = props
+  const { mount, loadUrl, goBack, goForward, reload, setSandbox, useBrowserState, useStore, useTabInfo, t } = props
   const { tab } = useTabInfo()
-  const state = useStore(snapshot => snapshot.byTab[tab.id]) ?? BrowserNavigation.empty()
-  const initialState = useRef(state)
+  const saved = useStore(state => state.byTab[tab.id])
+  const initial = useRef(saved)
   const initialUrl = useRef(tab.navigation.params?.url)
-  const current = BrowserNavigation.current(state)
-  const [draft, setDraft] = useBrowserDraft(current?.url ?? initialUrl.current, state.request?.revision)
-  const [mountCount, setMountCount] = useState(0)
+  const viewportId = useId()
+  const [mountEpoch, setMountEpoch] = useState(0)
+  const state = useBrowserState(tab.id)
+  const frame = state?.frame ?? EMPTY_FRAME
+  const target = frame.target ?? currentBrowserTarget(initial.current)
+  const [draft, setDraft] = useBrowserDraft(target?.url ?? initialUrl.current, state?.addressRevision ?? 0)
 
-  useEffect(() => {
-    mount(tab.id, tab.signal, window.location.origin, initialState.current)
-    setMountCount(count => count + 1)
-  }, [mount, tab.id, tab.signal])
+  useLayoutEffect(() => {
+    const hide = mount({
+      tabId: tab.id, signal: tab.signal, viewportId, applicationOrigin: window.location.origin,
+      initial: initial.current, initialUrl: initialUrl.current,
+      openTab: url => { tab.actions.openTab('browser', { params: { url }, revealIfOpened: false }) },
+    })
+    setMountEpoch(value => value + 1)
+    return hide
+  }, [mount, tab.id, tab.signal, tab.actions, viewportId, props.actions])
 
-  useEffect(() => {
-    if (mountCount === 0) return
-    const resumed = BrowserNavigation.current(initialState.current)
-    if (resumed !== undefined) {
-      reload(tab.id)
-      return
-    }
-    const url = initialUrl.current
-    if (url !== undefined) loadUrl(tab.id, url)
-  }, [loadUrl, mountCount, reload, tab.id])
-
-  const frameState = useBrowserFrame(tab.id) ?? INITIAL_BROWSER_FRAME
-  const { document, sandboxed, loadFailed } = frameState
-
-  const navigationUnknown = state.navigation.status === 'unknown'
-  const externalUrl = navigationUnknown ? undefined : current?.url
+  const unknown = frame.address === 'unknown'
+  const externalUrl = unknown ? undefined : target?.url
+  const sandboxed = frame.sandboxEnabled
+  const failure = state?.addressFailure
+  const error = frame.error
   const submit = (event: FormEvent): void => { event.preventDefault(); loadUrl(tab.id, draft) }
-  const failure = state.failure === undefined ? undefined : failureText(state.failure.reason, t)
-  const placeholder = current === undefined ? t('start') : t('loading')
 
   return (
     <div className={css.root}>
       <form className={css.toolbar} onSubmit={submit}>
-        <button type="button" className={css.tool} aria-label={t('back')} title={t('back')} disabled={!BrowserNavigation.canGoBack(state)} onClick={() => { goBack(tab.id) }}><IconChevronLeftOutlineRegular /></button>
-        <button type="button" className={css.tool} aria-label={t('forward')} title={t('forward')} disabled={!BrowserNavigation.canGoForward(state)} onClick={() => { goForward(tab.id) }}><IconChevronRightOutlineRegular /></button>
-        <button type="button" className={css.tool} aria-label={t('reload')} title={t('reload')} disabled={current === undefined} onClick={() => { reload(tab.id) }}><IconRefreshOutlineRegular /></button>
+        <button type="button" className={css.tool} aria-label={t('back')} title={t('back')} disabled={!frame.canGoBack} onClick={() => { goBack(tab.id) }}><IconChevronLeftOutlineRegular /></button>
+        <button type="button" className={css.tool} aria-label={t('forward')} title={t('forward')} disabled={!frame.canGoForward} onClick={() => { goForward(tab.id) }}><IconChevronRightOutlineRegular /></button>
+        <button type="button" className={css.tool} aria-label={t('reload')} title={t('reload')} disabled={target === undefined || mountEpoch === 0} onClick={() => { reload(tab.id) }}><IconRefreshOutlineRegular /></button>
         <div className={css.addressBox}>
           <input
-            className={`${css.address} ${navigationUnknown ? css.addressUnknown : ''}`}
+            className={[css.address, unknown ? css.addressUnknown : ''].join(' ')}
             value={draft}
             aria-label={t('address.placeholder')}
             placeholder={t('address.placeholder')}
             spellCheck={false}
-            onChange={(event) => { setDraft(event.currentTarget.value) }}
+            onChange={event => { setDraft(event.currentTarget.value) }}
           />
-          {navigationUnknown && <span className={css.addressChanged}>{t('address.changed')}</span>}
-          <button type="submit" className={`${css.tool} ${css.addressGo}`} aria-label={t('go')} title={t('go')}><IconLinkOutlineRegular /></button>
+          {unknown && <span className={css.addressChanged}>{t('address.changed')}</span>}
+          <button type="submit" className={[css.tool, css.addressGo].join(' ')} aria-label={t('go')} title={t('go')}><IconLinkOutlineRegular /></button>
         </div>
-        <button
-          type="button"
-          className={css.tool}
-          aria-label={t('external')}
-          title={t('external')}
-          disabled={externalUrl === undefined}
-          onClick={() => {
-            /* v8 ignore next -- React does not dispatch clicks from this disabled button. */
-            if (externalUrl !== undefined) window.open(externalUrl, '_blank', 'noopener,noreferrer')
-          }}
+        <button type="button" className={css.tool} aria-label={t('external')} title={t('external')} disabled={externalUrl === undefined}
+          onClick={() => { if (externalUrl !== undefined) window.open(externalUrl, '_blank', 'noopener,noreferrer') }}
         ><IconRightUpOutlineRegular size={14} /></button>
-        <button
+        {sandboxed !== undefined && <button
           type="button"
-          className={`${css.tool} ${sandboxed ? '' : css.sandboxOff}`}
+          className={[css.tool, sandboxed ? '' : css.sandboxOff].join(' ')}
           aria-label={t(sandboxed ? 'sandbox.disable' : 'sandbox.enable')}
           title={t(sandboxed ? 'sandbox.disable' : 'sandbox.enable')}
           aria-pressed={!sandboxed}
-          disabled={mountCount === 0}
-          onClick={() => { toggleSandbox(tab.id) }}
-        ><SandboxPolicyIcon sandboxed={sandboxed} /></button>
+          onClick={() => { setSandbox(tab.id, !sandboxed) }}
+        ><SandboxPolicyIcon sandboxed={sandboxed} /></button>}
       </form>
-      {!sandboxed && <div className={css.sandboxWarning} role="status">{t('sandbox.warning')}</div>}
-      {loadFailed && <div className={css.failure} role="status">{t('web.loadFailed')}</div>}
-      {failure !== undefined && <div className={css.failure} role="alert">{failure}</div>}
-      {document === undefined
-        ? <div className={css.start}>{placeholder}</div>
-        : <iframe
-          key={`${document.target.url}:${String(document.revision)}`}
-          className={css.frame}
-          src={document.src}
-          sandbox={sandboxed ? WEB_BROWSER_SANDBOX : undefined}
-          referrerPolicy="no-referrer"
-          title={document.target.title}
-          onLoad={() => { reportLoaded(tab.id, document.revision) }}
-          /* v8 ignore next -- jsdom does not dispatch React iframe error events; BrowserFrame owns the tested behavior. */
-          onError={() => { reportLoadFailed(tab.id, document.revision) }}
-          data-sidebar-browser-frame
-        />}
-      {navigationUnknown && <p className={css.limit}>{t('web.unknown')}</p>}
+      {sandboxed === false && <div className={css.sandboxWarning} role="status">{t('sandbox.warning')}</div>}
+      {error !== undefined && <div className={css.failure} role="status">{error.code !== undefined && error.description !== undefined
+        ? t('load.failed.detail', { code: String(error.code), description: error.description })
+        : t('load.failed')}</div>}
+      {failure !== undefined && <div className={css.failure} role="alert">{t(`error.${failure}`)}</div>}
+      <div className={css.content} aria-busy={frame.loading}>
+        <div id={viewportId} className={css.viewport} aria-label={t('type.label')} />
+        {(target === undefined || frame.loading) && error === undefined && <div className={css.placeholder}>
+          <div className={css.start}>{t(target === undefined ? 'start' : 'loading')}</div>
+        </div>}
+      </div>
+      {unknown && <p className={css.limit}>{t('address.unknown')}</p>}
     </div>
   )
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserPresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/BrowserPresentation.ts
new file mode 100644
index 0000000000..dadf0dc478
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserPresentation.ts
@@ -0,0 +1,9 @@
+/** The presentation face is separate from page navigation and terminal disposal. */
+export interface BrowserPresentation {
+  /**
+   * Attach the page inside a committed content container.
+   * @param viewportId - content element id; its DOM ancestors must remain connected for page retention.
+   * @returns ends physical attachment, without disposing the navigation model; a later mount may reload the page.
+   */
+  mount(viewportId: string): () => void
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserTitle.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserTitle.tsx
index 55d479d5ae..6a3c54c7f5 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserTitle.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserTitle.tsx
@@ -2,7 +2,7 @@
 import type { ReactNode } from 'react'
 import { IconGlobeOutlineRegular } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
-import { BrowserNavigation } from '../browser/BrowserNavigation.ts'
+import { currentBrowserTarget } from '../browser/BrowserPersistence.ts'
 import type { BrowserStore } from '../browser/store.ts'
 import css from './Browser.module.css'
 
@@ -12,6 +12,6 @@ export type BrowserTitleProps = PropsRuntime<'sidebar.right.pane.tab.title'> & P
 /** Browser icon and current host name. */
 export function BrowserTitle({ useTabInfo, useStore }: BrowserTitleProps): ReactNode {
   const { tab } = useTabInfo()
-  const entry = useStore(state => BrowserNavigation.current(state.byTab[tab.id]))
+  const entry = useStore(state => currentBrowserTarget(state.byTab[tab.id]))
   return <><IconGlobeOutlineRegular className={css.titleIcon} />{entry?.title ?? tab.title}</>
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
new file mode 100644
index 0000000000..ed5743a079
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
@@ -0,0 +1,82 @@
+/** Electron tag DOM inside a Sidebar-owned, stable content container. */
+import type { DesktopBrowserReservation } from '../../desktop.ts'
+import type { BrowserPresentation } from './BrowserPresentation.ts'
+import css from './Browser.module.css'
+
+/** The Electron tag API used by its navigation provider. */
+export interface WebviewElement extends HTMLElement {
+  loadURL(url: string): Promise<void>
+  getURL(): string
+  getTitle(): string
+  canGoBack(): boolean
+  canGoForward(): boolean
+  clearHistory(): void
+  goBack(): void
+  goForward(): void
+  reload(): void
+  isLoading(): boolean
+}
+
+/** Physical attachment notifications; hiding a retained Sidebar body emits neither. */
+export interface ElectronPresentationEvents {
+  readonly mounted: () => void
+  readonly unmounted: () => void
+}
+
+/** Owns tag creation and attachment, without measuring or following another element. */
+export class ElectronWebviewPresentation implements BrowserPresentation {
+  private element: WebviewElement | undefined
+  private host: HTMLElement | undefined
+
+  constructor(private readonly events: ElectronPresentationEvents) {}
+
+  /** @param viewportId - committed content container. @returns ends attachment and releases its guest. */
+  mount(viewportId: string): () => void {
+    const host = document.getElementById(viewportId)
+    if (host === null) throw new Error('Electron presentation: content container is not mounted')
+    if (this.host !== undefined) this.events.unmounted()
+    this.host = host
+    this.events.mounted()
+    return () => {
+      if (this.host !== host) return
+      this.events.unmounted()
+      this.host = undefined
+    }
+  }
+
+  /** @param reservation - main-approved partition and bootstrap lease. @returns a detached, configured webview. */
+  createElement(reservation: DesktopBrowserReservation): WebviewElement {
+    const element = document.createElement('webview') as WebviewElement
+    element.className = css.webview as string
+    element.dataset.sidebarBrowserFrame = 'webview'
+    element.setAttribute('partition', reservation.partition)
+    element.setAttribute('allowpopups', '')
+    element.setAttribute('src', 'about:blank#' + reservation.lease)
+    return element
+  }
+
+  /** @param element - configured guest with its navigation listeners already installed. */
+  present(element: WebviewElement): void {
+    if (this.host === undefined) throw new Error('Electron presentation: cannot attach without a content container')
+    this.clear()
+    this.element = element
+    this.host.append(element)
+  }
+
+  /** @param title - observed document title, also used as the accessible label. */
+  show(title: string): void {
+    this.element?.setAttribute('aria-label', title)
+  }
+
+  /** Destroy only the guest DOM; a replacement may use the same mounted container. */
+  clear(): void {
+    this.element?.remove()
+    this.element = undefined
+  }
+
+  /** Destroy the guest DOM and release its content container. */
+  dispose(): void {
+    this.clear()
+    this.host = undefined
+  }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
new file mode 100644
index 0000000000..bbabde3343
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
@@ -0,0 +1,85 @@
+/** Iframe DOM and revision-tagged load observations. */
+import type { BrowserTarget } from '../browser/url.ts'
+import type { BrowserPresentation } from './BrowserPresentation.ts'
+import css from './Browser.module.css'
+
+/** Fixed iframe policy; top navigation and downloads are not granted directly. */
+export const WEB_BROWSER_SANDBOX = 'allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox'
+
+interface IframeDocument {
+  readonly target: BrowserTarget
+  readonly revision: number
+  readonly sandboxed: boolean
+}
+
+/** Reports only what an iframe can observe without inspecting cross-origin content. */
+export interface IframePresentationEvents {
+  readonly loaded: (revision: number) => void
+  readonly failed: (revision: number) => void
+  readonly remounted: () => void
+}
+
+/** Owns the iframe element; navigation and history remain in IframeImpl. */
+export class IframePresentation implements BrowserPresentation {
+  private host: HTMLElement | undefined
+  private element: HTMLIFrameElement | undefined
+  private document: IframeDocument | undefined
+  private rendered = false
+
+  /** @param events - provider-owned load and remount callbacks. */
+  constructor(private readonly events: IframePresentationEvents) {}
+
+  /** @param viewportId - mounted placeholder. @returns removes only the iframe presentation. */
+  mount(viewportId: string): () => void {
+    const host = document.getElementById(viewportId)
+    if (host === null) throw new Error('iframe presentation: viewport is not mounted')
+    this.element?.remove()
+    this.element = undefined
+    this.host = host
+    if (this.rendered) this.events.remounted()
+    else this.render()
+    return () => {
+      if (this.host !== host) return
+      this.element?.remove()
+      this.element = undefined
+      this.host = undefined
+    }
+  }
+
+  /** @param value - prepared document and event generation. */
+  show(value: IframeDocument): void {
+    this.document = value
+    this.render()
+  }
+
+  /** Remove the owned DOM and retained presentation data. */
+  dispose(): void {
+    this.element?.remove()
+    this.element = undefined
+    this.host = undefined
+    this.document = undefined
+  }
+
+  private render(): void {
+    const current = this.document
+    const host = this.host
+    if (current === undefined || host === undefined) return
+    this.element?.remove()
+    const element = document.createElement('iframe')
+    element.className = css.frame as string
+    element.src = current.target.url
+    element.title = current.target.title
+    element.referrerPolicy = 'no-referrer'
+    element.dataset.sidebarBrowserFrame = 'iframe'
+    if (current.sandboxed) element.setAttribute('sandbox', WEB_BROWSER_SANDBOX)
+    element.addEventListener('load', () => {
+      if (this.element === element) this.events.loaded(current.revision)
+    })
+    element.addEventListener('error', () => {
+      if (this.element === element) this.events.failed(current.revision)
+    })
+    this.element = element
+    this.rendered = true
+    host.append(element)
+  }
+}
diff --git a/packages/client/ui-sidebar-browser/src/desktop.ts b/packages/client/ui-sidebar-browser/src/desktop.ts
new file mode 100644
index 0000000000..d56b70ee14
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/desktop.ts
@@ -0,0 +1,27 @@
+/** Electron bridge declarations shared by the desktop shell and browser provider. */
+import type { Branded } from '@deepseek-ai/dsh-brand'
+
+/** Main-issued identity of one guest reservation. */
+export type DesktopBrowserLeaseId = Branded<'DesktopBrowserLeaseId'>
+
+/** A guest's approved, process-local storage partition. */
+export interface DesktopBrowserReservation {
+  readonly lease: DesktopBrowserLeaseId
+  readonly partition: string
+}
+
+/** Main-approved request to open an HTTP(S) page from an existing guest. */
+export interface DesktopBrowserOpenRequest {
+  readonly lease: DesktopBrowserLeaseId
+  readonly url: string
+}
+
+/** Origin-scoped operations; no Electron objects or arbitrary IPC cross this interface. */
+export interface DesktopBrowserBridge {
+  /** @param workspace - resolved storage account. @returns one approved guest reservation. */
+  acquire(workspace: string): Promise<DesktopBrowserReservation>
+  /** @param lease - the caller's reservation. @returns after its guest has been destroyed. */
+  release(lease: DesktopBrowserLeaseId): Promise<void>
+  /** @param lease - originating guest. @param listener - approved URL consumer. @returns unsubscribe callback. */
+  onOpenRequested(lease: DesktopBrowserLeaseId, listener: (url: string) => void): () => void
+}
diff --git a/packages/client/ui-sidebar-browser/tsconfig.json b/packages/client/ui-sidebar-browser/tsconfig.json
index d9c72fa907..2747227910 100644
--- a/packages/client/ui-sidebar-browser/tsconfig.json
+++ b/packages/client/ui-sidebar-browser/tsconfig.json
@@ -9,6 +9,8 @@
   ],
   "references": [
     { "path": "../../../vendor/cordis" },
+    { "path": "../../api/workspace-controller/tsconfig.client.json" },
+    { "path": "../../util/brand" },
     { "path": "../locale" },
     { "path": "../store" },
     { "path": "../ui-dockkit" },
diff --git a/packages/client/ui-sidebar-browser/tsdown.config.ts b/packages/client/ui-sidebar-browser/tsdown.config.ts
index 229343b169..9698b8d6c2 100644
--- a/packages/client/ui-sidebar-browser/tsdown.config.ts
+++ b/packages/client/ui-sidebar-browser/tsdown.config.ts
@@ -1,3 +1,3 @@
 import { clientBundle } from '../tsdown.client.ts'
 
-export default clientBundle('@deepseek-ai/dsh-client-ui-sidebar-browser', ['lib/types/index.js'])
+export default clientBundle('@deepseek-ai/dsh-client-ui-sidebar-browser', ['lib/types/index.js', 'lib/types/desktop.js'])
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 39acefeee7..00bb9175c9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4363,6 +4363,12 @@ importers:
       '@deepseek-ai/cordis':
         specifier: workspace:^
         version: link:../../../vendor/cordis
+      '@deepseek-ai/dsh-api-workspace-controller':
+        specifier: workspace:^
+        version: link:../../api/workspace-controller
+      '@deepseek-ai/dsh-brand':
+        specifier: workspace:^
+        version: link:../../util/brand
       '@deepseek-ai/dsh-client-locale':
         specifier: workspace:^
         version: link:../locale
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 41d158f02a..f8d965bf9b 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -193,6 +193,7 @@
       "@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client": ["./packages/client/ui-sidebar-documentpreview/src/client"],
       "@deepseek-ai/dsh-client-ui-sidebar-browser": ["./packages/client/ui-sidebar-browser/src"],
       "@deepseek-ai/dsh-client-ui-sidebar-browser/client": ["./packages/client/ui-sidebar-browser/src/client"],
+      "@deepseek-ai/dsh-client-ui-sidebar-browser/desktop": ["./packages/client/ui-sidebar-browser/src/desktop.ts"],
       "@deepseek-ai/dsh-api-workspace-files": ["./packages/api/workspace-files/src"],
       "@deepseek-ai/dsh-api-workspace-files/types": ["./packages/api/workspace-files/src/types.ts"],
       "@deepseek-ai/dsh-api-workspace-files/client": ["./packages/api/workspace-files/src/client/index.ts"],

From ab4bd4c630af020f19ae6a73f487df99f1c6f6f2 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 00:55:03 +0800
Subject: [PATCH 48/62] feat(desktop): enable lease-scoped sidebar webview
 guests

---
 ...26-09-20-desktop-browser-webview.i18n.yaml |   6 +
 .../2026-09-20-desktop-browser-webview.md     |  55 ++++++
 .../2026-09-20-desktop-browser-webview.zh.md  |  55 ++++++
 apps/desktop/package.json                     |   1 +
 apps/desktop/src/browser-guests.ts            | 166 ++++++++++++++++++
 apps/desktop/src/ipc.ts                       |   5 +
 apps/desktop/src/main.ts                      |  13 ++
 apps/desktop/src/preload-app.ts               |   2 +
 apps/desktop/src/preload-browser.ts           |  32 ++++
 apps/desktop/tsconfig.json                    |   1 +
 pnpm-lock.yaml                                |   3 +
 11 files changed, 339 insertions(+)
 create mode 100644 .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
 create mode 100644 .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
 create mode 100644 .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
 create mode 100644 apps/desktop/src/browser-guests.ts
 create mode 100644 apps/desktop/src/preload-browser.ts

diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
new file mode 100644
index 0000000000..492e032636
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+2026-09-20-desktop-browser-webview.md: cd809b956811af4ad8e73b4c06bd7daa44f154b8
+2026-09-20-desktop-browser-webview.zh.md: bc2b2f208d02b9dba5096b5e1c3754f75aea2ea2
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
new file mode 100644
index 0000000000..cd809b9568
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -0,0 +1,55 @@
+# Agent Note: Retained Desktop browser webviews
+
+Status: implemented
+
+English | [中文](2026-09-20-desktop-browser-webview.zh.md)
+
+## Problem
+
+An iframe cannot expose cross-origin navigation or render sites that refuse embedding. Sidebar tab bodies also unmount when their tab becomes inactive or changes containers. Creating an Electron guest inside that body couples page state to presentation and discards forms, scroll position and native history.
+
+Independent per-tab storage also prevents related pages in one Workspace from sharing site login state. Page lifetime and storage ownership need different owners.
+
+## Decision
+
+Desktop uses `<webview>` through `ElectronWebViewImpl`; Web retains its opt-in iframe carrier. The [Sidebar Browser decision](2026-09-16-sidebar-browser.md) continues to own shared tab behavior and iframe limitations. This note replaces its deferred Desktop mounting and per-tab partition design.
+
+The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retained-tab-layout.md) owns retained Session and tab containers in real CSS layout. Workspace storage ownership and baseline guest security remain with this note.
+
+- `BrowserController` owns address commands and recoverable presentation state. Native history stays in the guest; actual URL and title observations update the persisted address.
+- Controller registries are keyed by DSH Session, independently of presentation bindings. Rebinding replaces the store writer without recreating the page.
+- `pages.ts` composes a navigation provider and a presentation object. `ElectronWebViewImpl` owns guest leases and native navigation; `ElectronWebviewPresentation` creates the tag and attaches it inside the Sidebar-owned content container.
+- The Desktop Browser type declares `keepMounted`. Sidebar retains its DOM ancestors across hiding and docking; CSS owns layout and clipping. Docking gestures disable guest pointer input, and body-local drop hints use normal stacking. A physical unmount cancels pending attachment and releases the guest; a later mount recreates it from the known address.
+- Tab occurrence cancellation, plugin unload and window destruction release guests. Guest crashes leave a retryable failure; Reload creates a new guest. Application restart restores an address, not page memory or native history.
+
+The package's type-only `./desktop` entry declares the lease, reservation, open-request and bridge types shared by the main process, preload and Client. Preload exposes scoped operations and callbacks, not raw IPC or Electron objects.
+
+### Storage ownership
+
+`DesktopBrowserGuests` assigns a random, non-persistent Electron partition to each Workspace account. Browser tabs in different DSH Sessions share that account when they belong to the same Workspace; ungrouped Sessions have separate accounts. Workspace membership is resolved after the Client receives its authoritative baseline and is fixed for a guest occurrence.
+
+Closing a tab releases its guest, not its account's cookies or storage. Cookies, localStorage, IndexedDB, Service Workers and cache remain partition-owned and subject to normal origin rules. DOM, native history and sessionStorage remain page-owned. Account partitions survive window recreation within the Electron process but do not persist across application exit.
+
+### Initial guest policy
+
+Only the primary application window enables `webviewTag`. The main process accepts guest reservations only from that window's application top frame and validates a one-use lease, partition and inert initial `about:blank` document before allowing the guest. The main process replaces renderer-supplied preferences: no Node integration, guest preload, nested webviews, plugins, insecure content, dialogs or drag navigation; sandbox, context isolation and Web security stay enabled.
+
+Guest Sessions do not register the application protocol or inherit the application's authenticated request forwarding. Permission requests and checks, device access, display capture, downloads, native popup windows and HTTP authentication prompts are denied. Approved direct HTTP(S) popup requests without a POST body are routed through their live lease to a new Sidebar tab; scripted blank-window and POST popup flows remain unsupported. Navigation accepts credential-free HTTP(S); request filtering rejects local-file and privileged schemes and the known DSH Host endpoint, including common loopback aliases. This is not a general private-network or DNS-rebinding firewall.
+
+The Desktop toolbar has no sandbox-disable switch. The implementation adds no remote-debugging endpoint or browser-use integration. A future automation provider requires an authenticated, target-scoped broker rather than access to every application target. The separation of a target/lifetime handle from navigation commands follows the same distinction as Playwright's Android WebView and Page objects; device-level input is a separate responsibility.
+
+## Alternatives considered
+
+**Render the guest in a visibility-mounted tab body.** Unmounting disconnects the guest. Direct mounting requires the Sidebar's retained body and stable ancestor mechanism.
+
+**Move the guest between visible and hidden DOM containers.** Electron 44's `WebViewElement.disconnectedCallback` detaches the guest and resets its internal instance. Retaining the element reference or React key does not preserve that instance; the parent stays fixed instead.
+
+**Use one partition per tab.** This isolates site accounts between related pages. Workspace ownership provides the requested sharing without sharing the application Session; a tab still owns its own guest.
+
+**Change the partition of an active webview.** Electron fixes the partition before first navigation. Selecting another isolation scope requires a replacement guest and an explicit policy for existing site data, not a live attribute toggle.
+
+## Consequences
+
+Sidebar-owned stable ancestors preserve the page without Browser-owned geometry or occlusion handling. Hidden guests retain page memory and may continue network activity; there is no idle eviction policy. Persistent storage, selectable isolation scopes and permission-grant UI remain separate work. Temporary Workspace partitions are the current policy, not a promise that Workspace isolation always implies temporary storage.
+
+No tests or GUI recordings accompany this change. Compilation does not establish real Electron attachment timing, overlap, focus, platform styling or storage isolation; those remain runtime verification gaps. The unchanged iframe scenarios do not cover the native carrier. This implementation is not evidence that the complete browser security policy is ready for release.
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
new file mode 100644
index 0000000000..bc2b2f208d
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -0,0 +1,55 @@
+# Agent Note: 保持页面实例的 Desktop 浏览器 webview
+
+Status: implemented
+
+[English](2026-09-20-desktop-browser-webview.md) | 中文
+
+## Problem
+
+iframe 无法提供跨域导航状态，也无法显示拒绝嵌入的站点。Sidebar tab body 在 tab 失去活动状态或更换容器时还会卸载。直接在 body 内创建 Electron guest，会让页面状态依赖呈现组件，丢失表单、滚动位置与原生 history。
+
+独立的 per-tab 存储也会阻止同一 Workspace 内相关页面共享站点登录态。页面生命周期与存储需要不同的所有者。
+
+## Decision
+
+Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`；Web 保留显式启用的 iframe 载体。[Sidebar Browser 决策](2026-09-16-sidebar-browser.zh.md)继续负责共享 tab 行为与 iframe 限制。本文替代其中延期的 Desktop 挂载与 per-tab 分区设计。
+
+[Sidebar 稳定挂载决策](../architecture/2026-09-20-sidebar-retained-tab-layout.zh.md)负责真实 CSS 布局中的保活会话与 Tab 容器。Workspace 存储所有权与 guest 基础安全配置仍由本文负责。
+
+- `BrowserController` 负责地址命令与可恢复的展示状态。原生 history 留在 guest 内；真实 URL 与标题观察更新持久化地址。
+- 控制器注册表按 DSH Session 索引，不依赖呈现绑定的存活期。重新绑定只替换存储写入方，不重建页面。
+- `pages.ts` 组装导航提供方和呈现对象。`ElectronWebViewImpl` 负责 guest 租约与原生导航；`ElectronWebviewPresentation` 创建标签并挂载到 Sidebar 持有的内容容器内。
+- Desktop Browser 类型声明 `keepMounted`。Sidebar 在隐藏和停靠切换时保留其 DOM 祖先，CSS 负责布局与裁剪。停靠手势期间禁用 guest 指针输入，Body 内的放置提示使用普通层叠。物理卸载会取消未完成的挂载并释放 guest，之后重新挂载时从已知地址重建。
+- tab occurrence 取消、插件卸载与窗口销毁会释放 guest。guest 崩溃留下可重试的失败状态；刷新创建新 guest。应用重启只恢复地址，不恢复页面内存或原生 history。
+
+包内仅含类型的 `./desktop` 入口声明主进程、preload 和 Client 共用的租约、申请结果、打开请求与桥接类型。preload 只暴露限定范围的操作与回调，不暴露原始 IPC 或 Electron 对象。
+
+### Storage ownership
+
+`DesktopBrowserGuests` 为每个 Workspace 存储账号分配随机、非持久化的 Electron partition。不同 DSH Session 的 Browser tab 属于同一 Workspace 时共享该账号；未分组 Session 使用独立账号。Workspace 归属在 Client 收到权威基线后解析，并在一次 guest occurrence 内保持不变。
+
+关闭 tab 只释放它的 guest，不清空账号的 Cookie 或存储。Cookie、localStorage、IndexedDB、Service Worker 与缓存由 partition 持有，并继续遵循普通 origin 规则。DOM、原生 history 与 sessionStorage 仍由页面持有。账号 partition 在同一 Electron 进程内重建窗口后仍保留，但不跨应用退出持久化。
+
+### Initial guest policy
+
+只有主应用窗口启用 `webviewTag`。主进程只接受该窗口应用顶层 frame 发起的 guest 申请，并在放行前校验一次性租约、partition 与无活动内容的初始 `about:blank` 文档。主进程替换 renderer 提供的偏好：不启用 Node integration、guest preload、嵌套 webview、plugin、不安全内容、模态对话框或拖放导航；sandbox、context isolation 与 Web security 保持开启。
+
+guest Session 不注册应用协议，也不继承应用的认证请求转发。权限请求与检查、设备访问、屏幕捕获、下载、原生弹窗与 HTTP 认证提示全部拒绝。通过检查且不带 POST body 的直接 HTTP(S) 弹窗请求，通过活动租约路由为新 Sidebar Tab；脚本操作空白窗口和 POST 弹窗流程仍不支持。导航接受不带内嵌凭据的 HTTP(S)；请求过滤拒绝本地文件、特权协议与已知 DSH Host 地址，包括常见 loopback 别名。这不是通用的私有网络或 DNS rebinding 防火墙。
+
+Desktop toolbar 没有关闭 sandbox 的开关。实现不增加远程调试端口或 browser-use 集成。未来的自动化提供方需要经过认证、限定 target 的 broker，而不是访问全部应用 target。把 target/生命周期句柄与导航命令分开的方式，与 Playwright 的 Android WebView 和 Page 对象区分相同；设备级输入属于另一项职责。
+
+## Alternatives considered
+
+**在按可见性挂载的 tab body 内渲染 guest。** 卸载会断开 guest；直接挂载需要 Sidebar 提供 Body 保活与稳定祖先机制。
+
+**在可见与隐藏 DOM 容器之间搬移 guest。** Electron 44 的 `WebViewElement.disconnectedCallback` 会 detach guest 并重置内部实例。保留元素引用或 React key 不能保留该实例，因此父节点保持固定。
+
+**每个 tab 使用独立 partition。** 这会隔离相关页面的站点账号。Workspace 所有权提供所需的共享，同时不共享应用 Session；每个 tab 仍拥有独立 guest。
+
+**修改活动 webview 的 partition。** Electron 在首次导航前确定 partition。选择其他隔离粒度需要替换 guest，并明确已有站点数据的处置策略，而不是实时切换属性。
+
+## Consequences
+
+Sidebar 持有的稳定祖先保留页面，无需 Browser 自行处理几何或遮挡。隐藏 guest 保留页面内存，也可能继续联网；当前没有空闲回收策略。持久化存储、可选择的隔离级别与权限授权 UI 留作独立工作。临时 Workspace partition 是当前策略，并不意味着 Workspace 隔离必然要求临时存储。
+
+本次变更不附带测试或 GUI 录像。编译不能确认真实 Electron 的挂载时序、遮挡、焦点、平台样式或存储隔离；这些仍是运行时验证缺口。未修改的 iframe 场景不覆盖原生载体。此实现不构成完整浏览器安全策略已经可以发布的证据。
diff --git a/apps/desktop/package.json b/apps/desktop/package.json
index b9cb4b3592..a1cd3af539 100644
--- a/apps/desktop/package.json
+++ b/apps/desktop/package.json
@@ -41,6 +41,7 @@
   },
   "devDependencies": {
     "@deepseek-ai/dsh-app-boot": "workspace:^",
+    "@deepseek-ai/dsh-client-ui-sidebar-browser": "workspace:^",
     "@deepseek-ai/dsh-home-paths": "workspace:^",
     "@deepseek-ai/node-addon-system": "workspace:^",
     "@electron/get": "^5.1.0",
diff --git a/apps/desktop/src/browser-guests.ts b/apps/desktop/src/browser-guests.ts
new file mode 100644
index 0000000000..bdd6bf7209
--- /dev/null
+++ b/apps/desktop/src/browser-guests.ts
@@ -0,0 +1,166 @@
+/** Main-process ownership and fixed isolation policy for Sidebar webview guests. */
+import { randomUUID } from 'node:crypto'
+import { app, session, type BrowserWindow, type Session, type WebContents } from 'electron'
+import type { DesktopBrowserLeaseId, DesktopBrowserOpenRequest, DesktopBrowserReservation } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
+import { DESKTOP_IPC } from './ipc.ts'
+
+interface GuestLease {
+  readonly owner: WebContents
+  readonly partition: string
+  attached: boolean
+  guest?: WebContents
+}
+
+/** Owns workspace storage partitions independently from individual tab guests. */
+export class DesktopBrowserGuests {
+  private readonly partitions = new Map<string, string>()
+  private readonly leases = new Map<DesktopBrowserLeaseId, GuestLease>()
+
+  /** @param hostUrl - current authenticated DSH Host, which guests cannot request. */
+  constructor(private readonly hostUrl: () => string | undefined) {}
+
+  /**
+   * Reserve one guest in a workspace's process-lifetime partition.
+   * @param owner - authenticated primary application WebContents.
+   * @param workspace - workspace identity received over IPC.
+   * @returns opaque lease and the partition approved for it.
+   */
+  acquire(owner: WebContents, workspace: unknown): DesktopBrowserReservation {
+    if (typeof workspace !== 'string' || workspace.length === 0 || workspace.length > 4096) {
+      throw new Error('desktop browser: a workspace storage identity is required')
+    }
+    let partition = this.partitions.get(workspace)
+    if (partition === undefined) {
+      partition = `dsh-sidebar-browser-${randomUUID()}`
+      this.configureSession(session.fromPartition(partition))
+      this.partitions.set(workspace, partition)
+    }
+    const lease = randomUUID() as DesktopBrowserLeaseId
+    this.leases.set(lease, { owner, partition, attached: false })
+    return { lease, partition }
+  }
+
+  /**
+   * Release only a lease issued to this application window; workspace storage survives.
+   * @param owner - authenticated IPC sender.
+   * @param id - lease received over IPC.
+   */
+  async release(owner: WebContents, id: unknown): Promise<void> {
+    if (typeof id !== 'string') throw new Error('desktop browser: invalid guest lease')
+    const key = id as DesktopBrowserLeaseId
+    const lease = this.leases.get(key)
+    if (lease === undefined) return
+    if (lease.owner !== owner) throw new Error('desktop browser: guest belongs to another window')
+    this.leases.delete(key)
+    const guest = lease.guest
+    if (guest !== undefined && !guest.isDestroyed()) {
+      const destroyed = new Promise<void>(resolve => { guest.once('destroyed', resolve) })
+      guest.close({ waitForBeforeUnload: false })
+      await destroyed
+    }
+  }
+
+  /**
+   * Install attachment checks before the application document can create a webview.
+   * @param window - primary application window.
+   */
+  bind(window: BrowserWindow): void {
+    const owner = window.webContents
+    owner.on('will-attach-webview', (event, preferences, params) => {
+      const id = typeof params.src === 'string' && params.src.startsWith('about:blank#')
+        ? params.src.slice('about:blank#'.length) : ''
+      const lease = this.leases.get(id as DesktopBrowserLeaseId)
+      if (lease === undefined || lease.owner !== owner || lease.attached || params.partition !== lease.partition) {
+        event.preventDefault()
+        return
+      }
+      lease.attached = true
+      // Keep Electron's allowpopups dispatch flag; the guest handler still denies native windows.
+      for (const key of Object.keys(preferences)) {
+        if (key !== 'disablePopups') Reflect.deleteProperty(preferences, key)
+      }
+      Object.assign(preferences, {
+        partition: lease.partition,
+        nodeIntegration: false, nodeIntegrationInWorker: false, nodeIntegrationInSubFrames: false,
+        contextIsolation: true, sandbox: true, webSecurity: true, allowRunningInsecureContent: false,
+        webviewTag: false, plugins: false, navigateOnDragDrop: false, disableDialogs: true,
+        devTools: !app.isPackaged,
+      })
+      params.httpreferrer = ''
+    })
+    owner.on('did-attach-webview', (_event, guest) => {
+      let attachedLease: DesktopBrowserLeaseId | undefined
+      // The first document is an inert about:blank carrying the approved lease.
+      // Bind on the main-process event before the renderer can navigate the ready guest.
+      guest.once('dom-ready', () => {
+        const url = guest.getURL()
+        const id = (url.startsWith('about:blank#') ? url.slice('about:blank#'.length) : '') as DesktopBrowserLeaseId
+        const lease = this.leases.get(id)
+        if (lease === undefined || lease.owner !== owner || lease.guest !== undefined) {
+          guest.close({ waitForBeforeUnload: false })
+          return
+        }
+        lease.guest = guest
+        attachedLease = id
+        guest.once('destroyed', () => { this.leases.delete(id) })
+      })
+      guest.setWindowOpenHandler(({ url, postBody }) => {
+        const lease = attachedLease === undefined ? undefined : this.leases.get(attachedLease)
+        if (attachedLease !== undefined && lease?.guest === guest && lease.owner === owner && !owner.isDestroyed()
+          && postBody === undefined && this.allowedNavigation(url)) {
+          const request: DesktopBrowserOpenRequest = { lease: attachedLease, url: new URL(url).href }
+          owner.send(DESKTOP_IPC.browserOpenRequested, request)
+        }
+        return { action: 'deny' }
+      })
+      guest.on('will-frame-navigate', (event) => {
+        if (event.isMainFrame && !this.allowedNavigation(event.url)) event.preventDefault()
+      })
+      guest.on('will-redirect', (event, url, _inPlace, mainFrame) => {
+        if (mainFrame && !this.allowedNavigation(url)) event.preventDefault()
+      })
+      guest.on('will-attach-webview', (event) => { event.preventDefault() })
+      guest.on('login', (event, _details, _authInfo, callback) => { event.preventDefault(); callback() })
+    })
+    const releaseAll = (): void => {
+      for (const [id, lease] of this.leases) {
+        if (lease.owner === owner) void this.release(owner, id).catch((error: unknown) => { console.error(error) })
+      }
+    }
+    owner.on('did-start-navigation', (_event, _url, inPlace, mainFrame) => {
+      if (mainFrame && !inPlace) releaseAll()
+    })
+    owner.on('render-process-gone', releaseAll)
+    owner.once('destroyed', releaseAll)
+  }
+
+  private configureSession(browserSession: Session): void {
+    browserSession.setPermissionRequestHandler((_contents, _permission, callback) => { callback(false) })
+    browserSession.setPermissionCheckHandler(() => false)
+    browserSession.setDevicePermissionHandler(() => false)
+    browserSession.setDisplayMediaRequestHandler((_request, callback) => { callback({}) })
+    browserSession.on('will-download', (event) => { event.preventDefault() })
+    browserSession.webRequest.onBeforeRequest((details, callback) => {
+      const url = new URL(details.url)
+      const network = ['http:', 'https:', 'ws:', 'wss:'].includes(url.protocol)
+      callback({ cancel: network
+        ? url.username !== '' || url.password !== '' || this.isApplicationHost(url)
+        : !['about:', 'data:', 'blob:'].includes(url.protocol) })
+    })
+  }
+
+  private allowedNavigation(value: string): boolean {
+    if (!URL.canParse(value)) return false
+    const url = new URL(value)
+    return ['http:', 'https:'].includes(url.protocol) && url.username === '' && url.password === ''
+      && !this.isApplicationHost(url)
+  }
+
+  private isApplicationHost(url: URL): boolean {
+    const value = this.hostUrl()
+    if (value === undefined) return false
+    const host = new URL(value)
+    return url.port === host.port
+      && (url.hostname === host.hostname || ['localhost', '127.0.0.1', '[::1]'].includes(url.hostname))
+  }
+}
diff --git a/apps/desktop/src/ipc.ts b/apps/desktop/src/ipc.ts
index f5f1f6e82e..f45b0a7a23 100644
--- a/apps/desktop/src/ipc.ts
+++ b/apps/desktop/src/ipc.ts
@@ -1,11 +1,15 @@
 /** Typed preload operations exposed only by the Electron shell. */
 
 import type { IpcMainInvokeEvent } from 'electron'
+import type { DesktopBrowserBridge } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
 
 /** IPC channel names kept private to the desktop application bundle. */
 export const DESKTOP_IPC = {
   boot: 'dsh-desktop:boot',
   bootFailed: 'dsh-desktop:boot-failed',
+  browserAcquire: 'dsh-desktop:browser-acquire',
+  browserRelease: 'dsh-desktop:browser-release',
+  browserOpenRequested: 'dsh-desktop:browser-open-requested',
   directoryPick: 'dsh-desktop:directory-pick',
   updatesStatus: 'dsh-desktop:updates-status',
   updatesOpen: 'dsh-desktop:updates-open',
@@ -54,6 +58,7 @@ export interface DesktopUpdatePresentation {
 /** Product documents cannot supply update versions, package URLs, or installation authorization. */
 export interface DshDesktopProductApi {
   readonly protocolVersion: 1
+  readonly browser: DesktopBrowserBridge
   readonly updates: {
     status(): Promise<DesktopUpdatePresentation>
     open(): Promise<void>
diff --git a/apps/desktop/src/main.ts b/apps/desktop/src/main.ts
index 7531a7cfa9..6a198be748 100644
--- a/apps/desktop/src/main.ts
+++ b/apps/desktop/src/main.ts
@@ -39,6 +39,7 @@ import { DesktopMandatoryUpdateWindow } from './mandatory-update-window.ts'
 import { DesktopPolicyTestAuth } from './policy-test-auth.ts'
 import { DesktopUpdateDialog, type UpdateDialogOptions } from './update-dialog.ts'
 import { readDesktopRuntime } from './runtime-tree.ts'
+import { DesktopBrowserGuests } from './browser-guests.ts'
 
 let focusPrimaryWindow = (): void => {}
 let stopForRecovery = async (): Promise<void> => {}
@@ -137,6 +138,7 @@ function createWindow(preload: string, show = false, primary = false): BrowserWi
       contextIsolation: true,
       sandbox: true,
       webSecurity: true,
+      webviewTag: primary,
     },
   })
   window.webContents.setWindowOpenHandler(({ url }) => {
@@ -234,6 +236,7 @@ async function main(): Promise<void> {
   const applicationUrl = `${SCHEME}://app/`
   let hostUrl: string | undefined
   let hostCookie: string | undefined
+  const browserGuests = new DesktopBrowserGuests(() => hostUrl)
   let injections: readonly unknown[] = []
   const assertProductSender = (event: IpcMainInvokeEvent): void => {
     assertDesktopSender(event, ['app'])
@@ -443,6 +446,15 @@ async function main(): Promise<void> {
     reportFatal(new Error(message))
   })
 
+  ipcMain.handle(DESKTOP_IPC.browserAcquire, (event, workspace: unknown) => {
+    assertProductSender(event)
+    return browserGuests.acquire(event.sender, workspace)
+  })
+  ipcMain.handle(DESKTOP_IPC.browserRelease, (event, lease: unknown) => {
+    assertProductSender(event)
+    return browserGuests.release(event.sender, lease)
+  })
+
   session.defaultSession.webRequest.onBeforeSendHeaders({ urls: ['ws://127.0.0.1/*'] }, (details, callback) => {
     if (hostUrl === undefined || hostCookie === undefined || details.webContentsId !== mainWindow?.webContents.id) {
       callback({})
@@ -684,6 +696,7 @@ async function main(): Promise<void> {
   const createMainWindow = (): BrowserWindow => {
     const window = createWindow(appPreload, true, true)
     mainWindow = window
+    browserGuests.bind(window)
     window.on('focus', automaticCheck)
     window.on('closed', () => { if (mainWindow === window) mainWindow = undefined })
     window.webContents.on('did-fail-load', (_event, code, description, url, isMainFrame) => {
diff --git a/apps/desktop/src/preload-app.ts b/apps/desktop/src/preload-app.ts
index 3baf8dd2b9..9757994ef5 100644
--- a/apps/desktop/src/preload-app.ts
+++ b/apps/desktop/src/preload-app.ts
@@ -6,9 +6,11 @@ import { markDocumentPlatform, syncWindowFullscreen } from './preload-platform.t
 import { syncNativeTheme } from './preload-theme.ts'
 import { syncWindowsAppearance } from './preload-windows.ts'
 import { installMandatoryUpdateOverlay } from './preload-mandatory-overlay.ts'
+import { createDesktopBrowserBridge } from './preload-browser.ts'
 
 const product: DshDesktopProductApi = {
   protocolVersion: 1,
+  browser: createDesktopBrowserBridge(),
   updates: {
     status: () => ipcRenderer.invoke(DESKTOP_IPC.updatesStatus) as Promise<DesktopUpdatePresentation>,
     open: () => ipcRenderer.invoke(DESKTOP_IPC.updatesOpen) as Promise<void>,
diff --git a/apps/desktop/src/preload-browser.ts b/apps/desktop/src/preload-browser.ts
new file mode 100644
index 0000000000..75b0869055
--- /dev/null
+++ b/apps/desktop/src/preload-browser.ts
@@ -0,0 +1,32 @@
+/** Lease-scoped browser operations and one main-process event subscription per window. */
+import { ipcRenderer } from 'electron'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
+import { DESKTOP_IPC } from './ipc.ts'
+
+/** @returns browser operations that expose neither IPC nor Electron objects. */
+export function createDesktopBrowserBridge(): DesktopBrowserBridge {
+  const listeners = new Map<DesktopBrowserLeaseId, Set<(url: string) => void>>()
+  ipcRenderer.on(DESKTOP_IPC.browserOpenRequested, (_event, request: unknown) => {
+    if (typeof request !== 'object' || request === null || !('lease' in request) || !('url' in request)
+      || typeof request.lease !== 'string' || typeof request.url !== 'string') return
+    const callbacks = listeners.get(request.lease as DesktopBrowserLeaseId)
+    if (callbacks === undefined) return
+    for (const callback of [...callbacks]) {
+      try { callback(request.url) }
+      catch (error) { console.error('Desktop browser link handler failed', error) }
+    }
+  })
+  return {
+    acquire: workspace => ipcRenderer.invoke(DESKTOP_IPC.browserAcquire, workspace) as ReturnType<DesktopBrowserBridge['acquire']>,
+    release: lease => ipcRenderer.invoke(DESKTOP_IPC.browserRelease, lease) as Promise<void>,
+    onOpenRequested(lease, listener) {
+      let callbacks = listeners.get(lease)
+      if (callbacks === undefined) { callbacks = new Set(); listeners.set(lease, callbacks) }
+      callbacks.add(listener)
+      return () => {
+        callbacks.delete(listener)
+        if (callbacks.size === 0 && listeners.get(lease) === callbacks) listeners.delete(lease)
+      }
+    },
+  }
+}
diff --git a/apps/desktop/tsconfig.json b/apps/desktop/tsconfig.json
index 6811108afd..ed6f41ce6e 100644
--- a/apps/desktop/tsconfig.json
+++ b/apps/desktop/tsconfig.json
@@ -7,6 +7,7 @@
   "include": ["src"],
   "references": [
     { "path": "../../packages/boot/app-boot" },
+    { "path": "../../packages/client/ui-sidebar-browser" },
     { "path": "../../packages/util/home-paths" }
   ]
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 00bb9175c9..407a83ed4d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -557,6 +557,9 @@ importers:
       '@deepseek-ai/dsh-app-boot':
         specifier: workspace:^
         version: link:../../packages/boot/app-boot
+      '@deepseek-ai/dsh-client-ui-sidebar-browser':
+        specifier: workspace:^
+        version: link:../../packages/client/ui-sidebar-browser
       '@deepseek-ai/dsh-home-paths':
         specifier: workspace:^
         version: link:../../packages/util/home-paths

From c402892c1aee70478ac230dc04cc7c6eb2aebc1e Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 00:55:22 +0800
Subject: [PATCH 49/62] feat(browser): add manual page recovery and cwd storage
 grouping

---
 ...9-20-sidebar-retained-tab-layout.i18n.yaml |  4 +-
 .../2026-09-20-sidebar-retained-tab-layout.md |  3 +-
 ...26-09-20-sidebar-retained-tab-layout.zh.md |  3 +-
 .../2026-09-16-sidebar-browser.i18n.yaml      |  4 +-
 .../feature/2026-09-16-sidebar-browser.md     | 14 ++++--
 .../feature/2026-09-16-sidebar-browser.zh.md  | 14 ++++--
 ...26-09-20-desktop-browser-webview.i18n.yaml |  4 +-
 .../2026-09-20-desktop-browser-webview.md     |  4 +-
 .../2026-09-20-desktop-browser-webview.zh.md  |  4 +-
 .../src/client/browser/BrowserController.ts   | 46 ++++++++++++++-----
 .../src/client/browser/BrowserPage.ts         |  2 +-
 .../src/client/browser/ElectronWebViewImpl.ts |  5 +-
 .../src/client/browser/IframeImpl.ts          |  8 +++-
 .../src/client/browser/workspace.ts           |  6 +--
 .../ui-sidebar-browser/src/client/index.ts    |  6 ++-
 .../ui-sidebar-browser/src/client/locales.ts  |  6 ++-
 .../src/client/view/Browser.module.css        | 39 ++++++++++++++++
 .../src/client/view/BrowserBody.tsx           | 16 +++++--
 18 files changed, 143 insertions(+), 45 deletions(-)

diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
index 657f035be9..d901a7b963 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
-2026-09-20-sidebar-retained-tab-layout.md: ed5404009d6d8844c54aef224eac2dd238dc7a4c
-2026-09-20-sidebar-retained-tab-layout.zh.md: 0539dee38c9b2b9ecc1f5e9b8d1608dd9b5ea518
+2026-09-20-sidebar-retained-tab-layout.md: 7430c0f20c5e7161658f8d55e2b597ecfca91d8c
+2026-09-20-sidebar-retained-tab-layout.zh.md: a6efd26b52ec8a1b671369b5f70ddb677358adca
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
index ed5404009d..7430c0f20c 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
@@ -50,7 +50,8 @@ The [Desktop Browser decision](../feature/2026-09-20-desktop-browser-webview.md)
 | Collapse Sidebar | Hide docked cells; foreground floats remain visible. |
 | Session A → B → A | Hide and reshow A's original tree instead of loading its saved URL. |
 | Close, provider unload or actual generation termination | Release the body and guest; undo creates a new occurrence. |
-| Application restart, window reload or guest crash | Use provider recovery or retry; page memory and native history are not durable. |
+| Application restart or window reload | Show the saved title and URL; load only after an explicit restore or address submission. |
+| Guest crash | Retry through the provider; page memory and native history are not durable. |
 
 [Layout and provider recovery](2026-09-14-sidebar-layout-provider-recovery.md) remains independent: persisted tab identity, placement and address support cold starts, not DOM serialization. A hidden page may continue scripts, media and networking.
 
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
index 0539dee38c..a6efd26b52 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
@@ -50,7 +50,8 @@ Tab 提供 Body 保活持有，而不独立申请会话引用。这些持有跟
 | 收起 Sidebar | 隐藏停靠 cell，前台浮窗保持可见。 |
 | 会话 A → B → A | 隐藏并重新显示 A 的原内容树，而非加载已保存 URL。 |
 | 关闭、提供方卸载或真实 generation 结束 | 释放 Body 和 guest；撤销关闭创建新 occurrence。 |
-| 应用重启、窗口刷新或 guest 崩溃 | 走提供方恢复或重试；页面内存和原生 history 不持久化。 |
+| 应用重启或窗口刷新 | 展示保存的标题和 URL，显式恢复或提交地址后才加载。 |
+| guest 崩溃 | 通过提供方重试；页面内存和原生 history 不持久化。 |
 
 [布局与提供方恢复](2026-09-14-sidebar-layout-provider-recovery.zh.md)仍然独立：持久化的 Tab 身份、位置和地址支持冷启动，而不是序列化 DOM。隐藏页面可能继续执行脚本、播放媒体或联网。
 
diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
index dcea202398..fac9746b09 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
-2026-09-16-sidebar-browser.md: ffea3d4bb75a67b7ed1c6f5c6b2450a80190b0c3
-2026-09-16-sidebar-browser.zh.md: da1ed607804b940f0b614411b78ab895581832ed
+2026-09-16-sidebar-browser.md: eff143cc042da7c6455152f684ec83dfa654a1ec
+2026-09-16-sidebar-browser.zh.md: a037c2fb54be745a3a85f43561c0bd587873c008
diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
index ffea3d4bb7..eff143cc04 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md
@@ -22,13 +22,17 @@ The Web carrier is an iframe; Desktop uses the [retained webview carrier](2026-0
 
 Each tab receives one `BrowserController` for address validation and carrier-independent commands. `BrowserFrame` exposes navigation, observable address/loading/history/error state, and an optional sandbox control; `BrowserPresentation` owns DOM attachment. `pages.ts` composes these two objects into a `BrowserPage`. `IframeImpl` owns application-known `BrowserNavigation`, while `ElectronWebViewImpl` observes native history. Slot injection exposes keyed controller state through `useBrowserState` and plain callbacks; the React body owns its draft and content container, with no carrier branch, controller instance or observable source.
 
-For the iframe carrier, `BrowserNavigation` keeps the canonical current URL, controlled-load revision, navigation state, and a bounded sequence with its index. A new address drops the forward branch; Back and Forward move the index; Reload recreates the last application-known URL without adding history. A remounted body reloads the latest application-known URL and consults its optional initial URL only before the first controlled target. The Session-scoped store only persists immutable snapshots from that class for title rendering and application reload. An occurrence abort removes its bucket; `TabDomain` uses that same abort for both tab removal and `ui-sidebar-right` unload, so unloading or hot-reloading the Sidebar clears Browser history even when DockKit later restores the tab record.
+For the iframe carrier, `BrowserNavigation` keeps the canonical current URL, controlled-load revision, navigation state, and a bounded sequence with its index. A new address drops the forward branch; Back and Forward move the index; Reload recreates the last application-known URL without adding history. Within a live controller, remounting a body reloads its last requested URL. The Session-scoped store persists immutable checkpoints for tab titles and cold-start recovery; it does not serialize a live page.
+
+A controller created from a saved checkpoint offers its last title and URL with a Restore page button. The provider starts idle: mounting the restored tab neither creates a browsing guest nor requests the saved site. Restore, toolbar Reload or address submission starts navigation; a fresh typed-open URL remains an explicit navigation request and loads directly. Before a page is requested, Back and Forward remain disabled, while Reload restores the saved address through the same controller action as Restore. Changing an idle iframe's sandbox does not restore it. This offer belongs to `BrowserControllerState`, not the live `BrowserFrame` interface or the persisted navigation status.
+
+Occurrence cancellation releases the controller. It removes the saved checkpoint only when the Sidebar's authoritative `openTabs` inventory no longer contains that tab. The inventory publishes layout removal before `TabDomain` aborts its occurrence; plugin unload also aborts occurrences but leaves saved tab membership intact. Cleanup therefore does not interpret plugin unload as a request to erase recovery data.
 
 Browser state is presentation state. It does not enter the Session log, model request, resource model, or DockKit layout operations. The existing [right Sidebar infrastructure](2026-09-04-right-sidebar-docking-infrastructure.md), [tab type contract](../architecture/2026-09-05-sidebar-tab-types-and-navigation.md), [resource model](../architecture/2026-09-05-client-resource-model.md), and [Document Preview operations](../architecture/2026-09-08-document-preview-operations.md) retain their existing responsibilities.
 
 ## Web navigation states
 
-The Web carrier treats only the first iframe `load` for a controlled revision as confirmation of the application-known URL. A later `load` for that revision proves that the document changed but cannot reveal the new cross-origin URL. Events carrying an older revision are ignored.
+The Web carrier treats only the first iframe `load` for a controlled revision as confirmation of the application-known URL. A later `load` for that revision proves that the document changed but cannot reveal the new cross-origin URL. Events carrying an older revision are ignored. These states describe active navigation; an unrequested saved checkpoint remains a separate restore offer.
 
 | State | Entry | Address and controls |
 |---|---|---|
@@ -37,7 +41,7 @@ The Web carrier treats only the first iframe `load` for a controlled revision as
 | `known` | The first iframe `load` arrives for the current revision. | The requested URL remains authoritative even when that first load includes an HTTP redirect. The controls follow the same known-target rules as `loading`. |
 | `unknown` | A second or later iframe `load` arrives for the current revision. | The last controlled URL is muted and marked `URL changed`. Back and Forward are disabled because iframe exposes no cross-origin `canGoBack` or `canGoForward`; external-open is disabled. Reload starts a new revision at the last controlled URL. |
 
-Address editing is available in every state. An invalid draft reports an address failure without changing the current navigation state. Focusing the unknown address hides its marker and reveals Go; Enter and Go both start a controlled load. Changing sandbox mode reloads the last controlled Web target under a new revision. An iframe `error` event marks only the current `BrowserFrame` revision with a transient load-failure notice; it does not change URL history, and the next controlled document clears it. Browsers do not reliably emit this event for DNS, TLS, mixed-content, CSP, or `X-Frame-Options` failures. `pushState`, `replaceState`, and fragment changes that emit no iframe `load` remain unobservable.
+Address editing is available in every state. An invalid draft reports an address failure without changing the current navigation state. Focusing the unknown address hides its marker and reveals Go; Enter and Go both start a controlled load. For an already requested page, changing sandbox mode reloads the last controlled Web target under a new revision. An iframe `error` event marks only the current `BrowserFrame` revision with a transient load-failure notice; it does not change URL history, and the next controlled document clears it. Browsers do not reliably emit this event for DNS, TLS, mixed-content, CSP, or `X-Frame-Options` failures. `pushState`, `replaceState`, and fragment changes that emit no iframe `load` remain unobservable.
 
 ## Electron carrier
 
@@ -45,6 +49,8 @@ The [Desktop webview decision](2026-09-20-desktop-browser-webview.md) owns nativ
 
 ## Alternatives considered
 
+**Automatically reload saved pages when their tabs mount.** This resumes third-party requests and scripts merely by restoring the layout. An explicit restore action preserves the saved address without opening the site.
+
 **Add a Host embeddability probe and persist the sandbox preference.** Rejected because fetching arbitrary targets on the Host adds an SSRF path, the probe can disagree with later redirects, and a persistent global escape makes later tabs inherit an unsafe choice. Browser instead offers an explicit per-tab, non-persistent sandbox toggle with a visible warning.
 
 **Treat parent-owned history as the complete Web model.** Rejected because it silently leaves a stale address and enabled actions after an in-frame navigation. The bounded parent-owned history remains useful while the current controlled URL is known; the explicit `unknown` state removes claims that the iframe API cannot support.
@@ -59,6 +65,8 @@ The [Desktop webview decision](2026-09-20-desktop-browser-webview.md) owns nativ
 
 Unit tests cover protocol parsing, delegated Markdown links, controller commands and lifecycle, deterministic navigation-state transitions, bounded history, best-effort iframe errors, and plugin disposal. Keyless Web scenarios boot the shipped composition and exercise message-link routing, HTTP(S), Back, Forward, sandbox control, unknown navigation, and protocol refusal.
 
+Manual cold-start restoration and checkpoint retention across plugin unload have no runtime verification yet.
+
 ## Consequences
 
 The iframe carrier exposes no Electron or Node APIs. Many sites refuse iframe embedding or require downloads or top-level navigation withheld from the frame by the default sandbox. An HTTPS application can block public HTTP pages as mixed content or restrict private-network requests, and disabling the sandbox does not bypass those browser policies. Disabling the sandbox otherwise trades its protections for compatibility: the frame can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. A Web popup that escapes the sandbox retains its opener and can navigate the top-level application through that chain. Neither path adds Electron or Node APIs. The URL gate cannot prevent an embedded page from choosing its own destination. A later iframe load exposes that navigation occurred but not its cross-origin URL; History API and fragment changes can remain completely invisible.
diff --git a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
index da1ed60780..a037c2fb54 100644
--- a/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md
@@ -22,13 +22,17 @@ Web 使用 iframe 载体；Desktop 使用[保持页面实例的 webview 载体](
 
 每个 tab 获得一个 `BrowserController`，负责地址校验与载体无关的命令。`BrowserFrame` 提供导航、可观察的地址/加载/history/错误状态和可选 sandbox 控制，`BrowserPresentation` 负责 DOM 挂载。`pages.ts` 把两个对象组装成 `BrowserPage`。`IframeImpl` 持有应用已知的 `BrowserNavigation`，`ElectronWebViewImpl` 则观察原生 history。Slot injection 通过 `useBrowserState` 提供按 key 索引的控制器状态和普通回调；React body 只持有草稿与内容容器，没有载体分支、控制器实例或可观察源。
 
-对于 iframe 载体，`BrowserNavigation` 保存 canonical 当前 URL、受控加载 revision、导航状态，以及有上限的序列与当前位置。新地址丢弃 forward 分支；后退和前进移动 index；刷新重建应用最后已知的 URL 且不增加 history。body 重挂载时会重新加载应用最后已知的 URL，并且仅在尚无受控目标时使用可选初始 URL。Session-scoped store 只持久化该 class 的 immutable snapshot，供标题渲染与应用刷新恢复。occurrence abort 会删除其 bucket；`TabDomain` 对 tab 删除与 `ui-sidebar-right` 卸载使用同一个 abort，因此卸载或热重载 Sidebar 会清空 Browser history，即使 DockKit 随后恢复 tab record。
+对于 iframe 载体，`BrowserNavigation` 保存 canonical 当前 URL、受控加载 revision、导航状态，以及有上限的序列与当前位置。新地址丢弃 forward 分支；后退和前进移动 index；刷新重建应用最后已知的 URL 且不增加 history。在仍存活的控制器内，body 重挂载会重新加载最后请求的 URL。Session-scoped store 持久化不可变检查点，供 Tab 标题与冷启动恢复使用，不序列化活页面。
+
+从已保存检查点创建的控制器展示上次标题、URL 和“恢复页面”按钮。提供方初始为空闲状态：挂载恢复的 Tab 既不创建浏览 guest，也不请求保存的站点。恢复、工具栏刷新或提交地址才启动导航；新打开 Tab 时显式传入的 URL 仍是主动导航请求，会直接加载。页面尚未请求时，后退和前进仍禁用，刷新则通过与“恢复页面”相同的控制器操作加载保存的地址。切换空闲 iframe 的沙箱也不会恢复页面。恢复提示属于 `BrowserControllerState`，不进入活页面的 `BrowserFrame` 接口或持久化导航状态。
+
+occurrence 取消会释放控制器。只有 Sidebar 的权威 `openTabs` 清单已不再包含该 Tab 时，才删除保存的检查点。清单先发布布局中的 Tab 移除，再由 `TabDomain` abort 对应 occurrence；插件卸载也会 abort occurrence，但仍保留已保存的 Tab 成员信息。因此清理不会把插件卸载当成删除恢复数据的请求。
 
 Browser 状态只属于呈现层，不进入 Session log、模型请求、resource model 或 DockKit layout operation。现有的[右侧 Sidebar 基础设施](2026-09-04-right-sidebar-docking-infrastructure.zh.md)、[tab 类型契约](../architecture/2026-09-05-sidebar-tab-types-and-navigation.zh.md)、[resource model](../architecture/2026-09-05-client-resource-model.zh.md)和[文档预览操作](../architecture/2026-09-08-document-preview-operations.zh.md)继续负责各自现有职责。
 
 ## Web 导航状态
 
-对于一个受控 revision，Web 载体只把 iframe 的第一次 `load` 当作应用已知 URL 的确认。同一 revision 后续发生 `load`，只能证明文档已经变化，无法给出新的跨域 URL。携带旧 revision 的事件会被忽略。
+对于一个受控 revision，Web 载体只把 iframe 的第一次 `load` 当作应用已知 URL 的确认。同一 revision 后续发生 `load`，只能证明文档已经变化，无法给出新的跨域 URL。携带旧 revision 的事件会被忽略。这些状态描述活动导航；尚未请求的已保存检查点仍是独立的恢复提示。
 
 | 状态 | 进入条件 | 地址与控件 |
 |---|---|---|
@@ -37,7 +41,7 @@ Browser 状态只属于呈现层，不进入 Session log、模型请求、resour
 | `known` | 当前 revision 收到 iframe 的第一次 `load`。 | 即使第一次加载包含 HTTP redirect，请求 URL 仍是权威地址。控件规则与 `loading` 的已知目标规则相同。 |
 | `unknown` | 当前 revision 收到 iframe 的第二次或后续 `load`。 | 最后一个受控 URL 变灰，并标记 `URL 已变化`。iframe 不提供跨域 `canGoBack` 或 `canGoForward`，因此后退和前进禁用；外部打开禁用。刷新以最后一个受控 URL 启动新的 revision。 |
 
-每个状态都允许编辑地址。无效草稿只报告地址错误，不改变当前导航状态。聚焦 unknown 地址会隐藏标记并显示前往按钮；回车与前往都会启动受控加载。切换 sandbox 模式会使用新的 revision 重新加载最后一个受控 Web 目标。iframe `error` event 只会为当前 `BrowserFrame` revision 标记临时加载失败 notice；它不改变 URL history，下一个受控 document 会清除它。浏览器不会为 DNS、TLS、mixed-content、CSP 或 `X-Frame-Options` 失败可靠触发该 event。不产生 iframe `load` 的 `pushState`、`replaceState` 与 fragment 变化仍不可观察。
+每个状态都允许编辑地址。无效草稿只报告地址错误，不改变当前导航状态。聚焦 unknown 地址会隐藏标记并显示前往按钮；回车与前往都会启动受控加载。对于已经请求的页面，切换 sandbox 模式会使用新的 revision 重新加载最后一个受控 Web 目标。iframe `error` event 只会为当前 `BrowserFrame` revision 标记临时加载失败 notice；它不改变 URL history，下一个受控 document 会清除它。浏览器不会为 DNS、TLS、mixed-content、CSP 或 `X-Frame-Options` 失败可靠触发该 event。不产生 iframe `load` 的 `pushState`、`replaceState` 与 fragment 变化仍不可观察。
 
 ## Electron carrier
 
@@ -45,6 +49,8 @@ Browser 状态只属于呈现层，不进入 Session log、模型请求、resour
 
 ## Alternatives considered
 
+**Tab 挂载时自动重新加载已保存页面。** 这会仅因恢复布局就恢复第三方请求与脚本执行。显式恢复操作保留已保存地址，但不会自行打开站点。
+
 **增加 Host embeddability probe 并持久化 sandbox 偏好。** 不采用，因为由 Host 请求任意目标会新增 SSRF 路径，probe 可能与后续重定向结果不一致，而持久化的全局逃生开关会让后续 tab 继承不安全选择。Browser 改为提供显式、按 tab、非持久化的 sandbox 开关，并持续显示警告。
 
 **把 parent-owned history 当成完整 Web 模型。** 不采用，因为 iframe 内导航后，地址会悄然陈旧，而相关操作仍显示可用。当前受控 URL 已知时，有上限的 parent history 仍然有用；显式 `unknown` 状态会移除 iframe API 无法支持的能力声明。
@@ -59,6 +65,8 @@ Browser 状态只属于呈现层，不进入 Session log、模型请求、resour
 
 单元测试覆盖协议解析、Markdown 链接委托、controller 命令与生命周期、确定性导航状态转换、有界 history、best-effort iframe error 和插件 disposal。Keyless Web 场景启动随附 composition，并覆盖消息链接路由、HTTP(S)、后退、前进、sandbox 控制、unknown 导航和协议拒绝。
 
+手动冷启动恢复和跨插件卸载保留检查点尚无运行时验证。
+
 ## Consequences
 
 iframe 载体不暴露 Electron 或 Node API。很多站点拒绝 iframe 嵌入，或者依赖默认 sandbox 不向 frame 提供的下载或顶层导航。HTTPS 应用可能按 mixed-content 策略阻止公共 HTTP 页面，或限制 private-network 请求；关闭 sandbox 也无法绕过这些浏览器策略。关闭 sandbox 在其他方面会用自身保护换取兼容性：frame 可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。逃逸出 sandbox 的 Web popup 会保留 opener，并可以通过该链导航顶层应用。这两条路径都不会增加 Electron 或 Node API。URL 检查无法阻止 iframe 内页面自行选择目标。后续 iframe load 能表明已经发生导航，但无法给出跨域 URL；History API 与 fragment 变化可能完全不可见。
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
index 492e032636..7f256eb541 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
-2026-09-20-desktop-browser-webview.md: cd809b956811af4ad8e73b4c06bd7daa44f154b8
-2026-09-20-desktop-browser-webview.zh.md: bc2b2f208d02b9dba5096b5e1c3754f75aea2ea2
+2026-09-20-desktop-browser-webview.md: 869308f2105f5145f22d3d4041b9f59fc6f36aa1
+2026-09-20-desktop-browser-webview.zh.md: 73299056d840b9e3f888f230514b38d704f33153
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
index cd809b9568..869308f210 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -20,13 +20,13 @@ The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retain
 - Controller registries are keyed by DSH Session, independently of presentation bindings. Rebinding replaces the store writer without recreating the page.
 - `pages.ts` composes a navigation provider and a presentation object. `ElectronWebViewImpl` owns guest leases and native navigation; `ElectronWebviewPresentation` creates the tag and attaches it inside the Sidebar-owned content container.
 - The Desktop Browser type declares `keepMounted`. Sidebar retains its DOM ancestors across hiding and docking; CSS owns layout and clipping. Docking gestures disable guest pointer input, and body-local drop hints use normal stacking. A physical unmount cancels pending attachment and releases the guest; a later mount recreates it from the known address.
-- Tab occurrence cancellation, plugin unload and window destruction release guests. Guest crashes leave a retryable failure; Reload creates a new guest. Application restart restores an address, not page memory or native history.
+- Tab occurrence cancellation, plugin unload and window destruction release guests. Guest crashes leave a retryable failure; Reload creates a new guest. Application restart offers the saved title and URL for explicit restoration; it creates no guest until the user restores or submits an address. Page memory and native history are not restored.
 
 The package's type-only `./desktop` entry declares the lease, reservation, open-request and bridge types shared by the main process, preload and Client. Preload exposes scoped operations and callbacks, not raw IPC or Electron objects.
 
 ### Storage ownership
 
-`DesktopBrowserGuests` assigns a random, non-persistent Electron partition to each Workspace account. Browser tabs in different DSH Sessions share that account when they belong to the same Workspace; ungrouped Sessions have separate accounts. Workspace membership is resolved after the Client receives its authoritative baseline and is fixed for a guest occurrence.
+`DesktopBrowserGuests` assigns a random, non-persistent Electron partition to each canonical CWD account. The Client uses the Host-normalized `WorkspaceView.path`, not the Workspace record UUID, so recreating a Workspace at the same directory does not change its storage account key. Browser tabs whose DSH Sessions resolve to that CWD share the account; Sessions without a resolved Workspace remain separately isolated. Workspace membership is resolved after the Client receives its authoritative baseline and is fixed for a guest occurrence. The CWD key controls sharing, not disk persistence.
 
 Closing a tab releases its guest, not its account's cookies or storage. Cookies, localStorage, IndexedDB, Service Workers and cache remain partition-owned and subject to normal origin rules. DOM, native history and sessionStorage remain page-owned. Account partitions survive window recreation within the Electron process but do not persist across application exit.
 
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
index bc2b2f208d..73299056d8 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -20,13 +20,13 @@ Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`；Web 保留显式启用
 - 控制器注册表按 DSH Session 索引，不依赖呈现绑定的存活期。重新绑定只替换存储写入方，不重建页面。
 - `pages.ts` 组装导航提供方和呈现对象。`ElectronWebViewImpl` 负责 guest 租约与原生导航；`ElectronWebviewPresentation` 创建标签并挂载到 Sidebar 持有的内容容器内。
 - Desktop Browser 类型声明 `keepMounted`。Sidebar 在隐藏和停靠切换时保留其 DOM 祖先，CSS 负责布局与裁剪。停靠手势期间禁用 guest 指针输入，Body 内的放置提示使用普通层叠。物理卸载会取消未完成的挂载并释放 guest，之后重新挂载时从已知地址重建。
-- tab occurrence 取消、插件卸载与窗口销毁会释放 guest。guest 崩溃留下可重试的失败状态；刷新创建新 guest。应用重启只恢复地址，不恢复页面内存或原生 history。
+- tab occurrence 取消、插件卸载与窗口销毁会释放 guest。guest 崩溃留下可重试的失败状态；刷新创建新 guest。应用重启展示保存的标题与 URL，等待显式恢复；用户恢复或提交地址之前不创建 guest。不恢复页面内存或原生 history。
 
 包内仅含类型的 `./desktop` 入口声明主进程、preload 和 Client 共用的租约、申请结果、打开请求与桥接类型。preload 只暴露限定范围的操作与回调，不暴露原始 IPC 或 Electron 对象。
 
 ### Storage ownership
 
-`DesktopBrowserGuests` 为每个 Workspace 存储账号分配随机、非持久化的 Electron partition。不同 DSH Session 的 Browser tab 属于同一 Workspace 时共享该账号；未分组 Session 使用独立账号。Workspace 归属在 Client 收到权威基线后解析，并在一次 guest occurrence 内保持不变。
+`DesktopBrowserGuests` 为每个规范化 CWD 存储账号分配随机、非持久化的 Electron partition。Client 使用 Host 规范化后的 `WorkspaceView.path`，不使用 Workspace 记录 UUID，因此在同一目录重建 Workspace 不改变存储账号 key。DSH Session 解析到同一 CWD 的 Browser Tab 共享账号；没有可解析 Workspace 的 Session 仍单独隔离。Workspace 归属在 Client 收到权威基线后解析，并在一次 guest occurrence 内保持不变。CWD key 控制共享关系，不决定是否落盘。
 
 关闭 tab 只释放它的 guest，不清空账号的 Cookie 或存储。Cookie、localStorage、IndexedDB、Service Worker 与缓存由 partition 持有，并继续遵循普通 origin 规则。DOM、原生 history 与 sessionStorage 仍由页面持有。账号 partition 在同一 Electron 进程内重建窗口后仍保留，但不跨应用退出持久化。
 
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index 346e570b77..68aa56ba2b 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -6,11 +6,13 @@ import type { BrowserFrameState } from './BrowserFrame.ts'
 import type { BrowserPage, BrowserPageFactory } from './BrowserPage.ts'
 import { currentBrowserTarget, type BrowserTabState } from './BrowserPersistence.ts'
 import type { BrowserStore } from './store.ts'
-import { parseBrowserAddress, type BrowserAddressFailure } from './url.ts'
+import { parseBrowserAddress, type BrowserAddressFailure, type BrowserTarget } from './url.ts'
 
 /** Live tab state; navigation comes from its provider and draft validation stays local. */
 export interface BrowserControllerState {
   readonly frame: BrowserFrameState
+  /** Saved address offered for explicit restoration before any page has been requested. */
+  readonly restoreTarget: BrowserTarget | undefined
   readonly addressFailure: BrowserAddressFailure | undefined
   readonly addressRevision: number
 }
@@ -56,13 +58,15 @@ export class BrowserController implements HostObservable<BrowserControllerState>
         options.openTab(result.target.url)
       },
     })
-    this.store = createSnapshotStore({ frame: this.page.frame.getSnapshot(), addressFailure: undefined, addressRevision: 0 })
+    this.store = createSnapshotStore({ frame: this.page.frame.getSnapshot(),
+      restoreTarget: currentBrowserTarget(this.checkpoint), addressFailure: undefined, addressRevision: 0 })
     this.unsubscribe = this.page.frame.subscribe(() => {
       if (this.disposed) return
       const current = this.store.getSnapshot()
       const frame = this.page.frame.getSnapshot()
       const changed = frame.target?.url !== current.frame.target?.url
-      this.store.set({ frame, addressFailure: changed ? undefined : current.addressFailure,
+      this.store.set({ frame, restoreTarget: frame.target === undefined ? currentBrowserTarget(this.checkpoint) : undefined,
+        addressFailure: changed ? undefined : current.addressFailure,
         addressRevision: current.addressRevision + Number(changed) })
     })
     options.signal.addEventListener('abort', this.abort, { once: true })
@@ -79,12 +83,17 @@ export class BrowserController implements HostObservable<BrowserControllerState>
     return this.page.presentation.mount(viewportId)
   }
 
-  /** @param initialUrl - typed-open address used only when no checkpoint exists. */
+  /** @param initialUrl - explicit typed-open address; a saved checkpoint alone never starts navigation. */
   start(initialUrl: string | undefined): void {
     if (this.started || this.disposed) return
     this.started = true
-    const value = currentBrowserTarget(this.checkpoint)?.url ?? initialUrl
-    if (value !== undefined) this.loadUrl(value)
+    if (initialUrl !== undefined) this.loadUrl(initialUrl)
+  }
+
+  /** Load the saved address only after an explicit restore action. */
+  restore(): void {
+    const target = this.store.getSnapshot().restoreTarget
+    if (target !== undefined) this.loadUrl(target.url)
   }
 
   /** @param value - address-bar or typed-open input. */
@@ -99,8 +108,11 @@ export class BrowserController implements HostObservable<BrowserControllerState>
   goBack(): void { this.command(() => { this.page.frame.goBack() }) }
   /** Delegate Forward to the page's navigation provider. */
   goForward(): void { this.command(() => { this.page.frame.goForward() }) }
-  /** Delegate Reload to the page's navigation provider. */
-  reload(): void { this.command(() => { this.page.frame.reload() }) }
+  /** Restore a saved address, or reload the already requested page. */
+  reload(): void {
+    if (this.store.getSnapshot().restoreTarget !== undefined) this.restore()
+    else this.command(() => { this.page.frame.reload() })
+  }
 
   /** @param enabled - optional embedding-sandbox control; unavailable providers remain unchanged. */
   setSandbox(enabled: boolean): void {
@@ -161,18 +173,26 @@ export interface BrowserInjected {
   rebind(actions: BoundActions<BrowserStore>): void
   /** @param tabId - owning tab. @param value - address input. */
   loadUrl(tabId: TabId, value: string): void
+  /** @param tabId - tab whose saved address the user requested to restore. */
+  restore(tabId: TabId): void
   /** @param tabId - owning tab. */
   goBack(tabId: TabId): void
   /** @param tabId - owning tab. */
   goForward(tabId: TabId): void
-  /** @param tabId - owning tab. */
+  /** Restore a saved address or reload its page. @param tabId - owning tab. */
   reload(tabId: TabId): void
   /** @param tabId - owning tab. @param enabled - provider's optional sandbox control. */
   setSandbox(tabId: TabId, enabled: boolean): void
 }
 
-/** @param actions - persisted view-state writer. @param createPage - composition-selected provider. @returns tab callbacks. */
-export function createBrowserControllers(actions: BoundActions<BrowserStore>, createPage: BrowserPageFactory): BrowserInjected {
+/**
+ * @param actions - persisted view-state writer.
+ * @param createPage - composition-selected provider.
+ * @param isTabOpen - authoritative layout membership, independent of mounted bodies and plugin lifetime.
+ * @returns tab callbacks.
+ */
+export function createBrowserControllers(actions: BoundActions<BrowserStore>, createPage: BrowserPageFactory,
+  isTabOpen: (tabId: TabId) => boolean): BrowserInjected {
   let currentActions = actions
   const controllers = new Map<TabId, {
     readonly signal: AbortSignal
@@ -195,7 +215,8 @@ export function createBrowserControllers(actions: BoundActions<BrowserStore>, cr
         const forget = (): void => {
           if (controllers.get(tabId)?.controller !== created) return
           controllers.delete(tabId)
-          currentActions.forget(tabId)
+          // Plugin unload also aborts occurrences; only layout removal deletes saved navigation.
+          if (!isTabOpen(tabId)) currentActions.forget(tabId)
         }
         held = { signal, controller: created, forget }
         controllers.set(tabId, held)
@@ -218,6 +239,7 @@ export function createBrowserControllers(actions: BoundActions<BrowserStore>, cr
       for (const { controller } of controllers.values()) controller.rebind(actions)
     },
     loadUrl: (id, value) => { controller(id)?.loadUrl(value) },
+    restore: id => { controller(id)?.restore() },
     goBack: id => { controller(id)?.goBack() },
     goForward: id => { controller(id)?.goForward() },
     reload: id => { controller(id)?.reload() },
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
index 619af40721..c235126cf6 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPage.ts
@@ -16,5 +16,5 @@ export interface BrowserPage {
   readonly presentation: BrowserPresentation
 }
 
-/** Construct a provider without starting navigation or attaching DOM. */
+/** Construct an idle provider without attaching DOM; saved navigation waits for an explicit frame command. */
 export type BrowserPageFactory = (options: BrowserPageOptions) => BrowserPage
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
index ef135250b2..9ab16bbc83 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
@@ -40,9 +40,8 @@ export class ElectronWebViewImpl implements BrowserFrame {
   constructor(private readonly options: BrowserPageOptions, private readonly bridge: DesktopBrowserBridge,
     private readonly workspace: (signal: AbortSignal) => Promise<string>,
     private readonly presentation: ElectronWebviewPresentation) {
-    const target = currentBrowserTarget(options.initial)
-    this.checkpoint = target
-    this.store = createSnapshotStore({ ...emptyBrowserFrame(), target, address: target === undefined ? 'empty' : 'requested' })
+    this.checkpoint = currentBrowserTarget(options.initial)
+    this.store = createSnapshotStore(emptyBrowserFrame())
   }
 
   /** @returns immutable carrier-neutral navigation state. */
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
index 01dbb94bb8..b4cf8989fa 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -1,7 +1,7 @@
 /** Iframe navigation provider with bounded application-known history. */
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { IframePresentation } from '../view/IframePresentation.ts'
-import type { BrowserFrame, BrowserFrameState, BrowserLoadError, BrowserSandboxControl } from './BrowserFrame.ts'
+import { emptyBrowserFrame, type BrowserFrame, type BrowserFrameState, type BrowserLoadError, type BrowserSandboxControl } from './BrowserFrame.ts'
 import type { BrowserPageOptions } from './BrowserPage.ts'
 import { BrowserNavigation } from './BrowserNavigation.ts'
 import type { BrowserTarget } from './url.ts'
@@ -19,7 +19,7 @@ export class IframeImpl implements BrowserFrame {
   /** @param options - initial checkpoint and persistence writer. @param presentation - iframe DOM adapter. */
   constructor(private readonly options: BrowserPageOptions, private readonly presentation: IframePresentation) {
     this.navigation = new BrowserNavigation(options.initial)
-    this.store = createSnapshotStore(this.snapshot())
+    this.store = createSnapshotStore({ ...emptyBrowserFrame(), sandboxEnabled: this.sandboxed })
   }
 
   /** @param revision - document generation whose iframe emitted load. */
@@ -68,6 +68,10 @@ export class IframeImpl implements BrowserFrame {
   private setSandbox(enabled: boolean): void {
     if (this.disposed || enabled === this.sandboxed) return
     this.sandboxed = enabled
+    if (this.store.getSnapshot().target === undefined) {
+      this.store.set({ ...this.store.getSnapshot(), sandboxEnabled: enabled })
+      return
+    }
     const request = this.navigation.reload()
     if (request === undefined) this.publish()
     else this.load(request)
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
index 27a0c160a1..0341de1c92 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
@@ -1,8 +1,8 @@
-/** Resolve browser storage only after the authoritative Workspace list has arrived. */
+/** Resolve CWD-keyed browser storage after the authoritative Workspace list has arrived. */
 import type { WorkspaceSource } from '@deepseek-ai/dsh-api-workspace-controller/client'
 
 /**
- * Resolve the workspace account; ungrouped Sessions get separate accounts.
+ * Use the Workspace's canonical CWD, not its record id; ungrouped Sessions remain isolated.
  * @param source - authoritative Workspace membership.
  * @param sessionId - owning DSH Session.
  * @param signal - guest initialization lifetime.
@@ -24,5 +24,5 @@ export async function browserWorkspace(source: WorkspaceSource, sessionId: strin
   }
   signal.throwIfAborted()
   const workspace = source.getSnapshot().items.find(item => item.sessionIds.some(id => id === sessionId))
-  return workspace === undefined ? `session:${sessionId}` : `workspace:${workspace.workspaceId}`
+  return workspace === undefined ? `session:${sessionId}` : `cwd:${workspace.path}`
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/index.ts b/packages/client/ui-sidebar-browser/src/client/index.ts
index 3f65a97b04..135374f63d 100644
--- a/packages/client/ui-sidebar-browser/src/client/index.ts
+++ b/packages/client/ui-sidebar-browser/src/client/index.ts
@@ -35,13 +35,14 @@ declare module '@deepseek-ai/dsh-client-ui-sidebar-right/client' {
 }
 
 /** Required Browser services. */
-export const inject = ['slots', 'locale', 'sidebarRightTabs']
+export const inject = ['slots', 'locale', 'sidebarRight', 'sidebarRightTabs']
 
 /** Register the Browser type, localized guide entry, body, and title. */
 export function apply(ctx: Context): void {
   const namespace = 'sidebarBrowser'
   const t = ctx.locale.bind(namespace)
   const store = createBrowserStore()
+  const openTabs = ctx.sidebarRight.openTabs
   const carrier = (globalThis as typeof globalThis & {
     dshDesktop?: { readonly protocolVersion: number; readonly browser?: DesktopBrowserBridge }
   }).dshDesktop
@@ -63,7 +64,8 @@ export function apply(ctx: Context): void {
           existing.rebind(actions)
           return existing
         }
-        const controller = createBrowserControllers(actions, factory(sessionId))
+        const controller = createBrowserControllers(actions, factory(sessionId), tabId =>
+          openTabs.getSnapshot().some(tab => tab.sessionId === sessionId && tab.tabId === tabId))
         controllers.set(sessionId, controller)
         return controller
       },
diff --git a/packages/client/ui-sidebar-browser/src/client/locales.ts b/packages/client/ui-sidebar-browser/src/client/locales.ts
index 27fcc3758b..3c0d305b66 100644
--- a/packages/client/ui-sidebar-browser/src/client/locales.ts
+++ b/packages/client/ui-sidebar-browser/src/client/locales.ts
@@ -15,13 +15,15 @@ export const zh = {
   'sandbox.warning': '沙箱限制已关闭；页面可以导航顶层应用，并使用下载、模态对话框与输入锁定。',
   start: '输入 HTTP(S) 地址开始浏览',
   loading: '正在打开…',
+  'restore.previous': '上次打开',
+  'restore.action': '恢复页面',
   'error.empty': '请输入地址。',
   'error.invalid': '这个地址无效或过长。',
   'error.protocol': '只支持 HTTP 和 HTTPS 地址；本地文件请使用文档预览。',
   'error.credentials': '地址不能包含用户名或密码。',
   'error.application-origin': '不能在嵌入浏览器中打开 DSH 应用自身。',
   'load.failed': '页面加载失败；请刷新重试或在系统浏览器中打开。',
-  'load.failed.detail': '页面加载失败（{code}）：{description}',
+  'load.failed.detail': '页面加载失败 ({code}): {description}',
   'address.unknown': '页面已跳转；当前载体无法读取新的 URL。',
 } satisfies Record<string, string>
 
@@ -45,6 +47,8 @@ export const en = {
   'sandbox.warning': 'Sandbox restrictions are disabled; the page can navigate the top-level app and use downloads, modal dialogs, and input locks.',
   start: 'Enter an HTTP(S) address to start browsing',
   loading: 'Opening…',
+  'restore.previous': 'Previously opened',
+  'restore.action': 'Restore page',
   'error.empty': 'Enter an address.',
   'error.invalid': 'That address is invalid or too long.',
   'error.protocol': 'Only HTTP and HTTPS addresses are supported; use Document Preview for local files.',
diff --git a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
index afbcf3f0ca..86b75721a2 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
+++ b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
@@ -143,6 +143,45 @@
   pointer-events: none;
 }
 
+.restore {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 10px;
+  padding: 24px;
+  overflow: auto;
+  text-align: center;
+}
+
+.restoreLabel {
+  margin: auto 0 0;
+  color: var(--dsw-alias-label-tertiary);
+  font: var(--dsw-font-xxs-12);
+}
+
+.restoreTitle {
+  max-width: 100%;
+  margin: 0;
+  overflow-wrap: anywhere;
+  font: var(--dsw-font-xs-13);
+  font-weight: 500;
+}
+
+.restoreUrl {
+  max-width: 100%;
+  margin: 0;
+  overflow-wrap: anywhere;
+  color: var(--dsw-alias-label-secondary);
+  font: var(--dsw-font-xxs-12);
+}
+
+.restore > :last-child {
+  flex-shrink: 0;
+  margin-bottom: auto;
+}
+
 .webview {
   display: flex;
   flex: 1 1 auto;
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
index ac437c2ce8..7c2e4462f5 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
@@ -2,6 +2,7 @@
 import { useId, useLayoutEffect, useRef, useState } from 'react'
 import type { FormEvent, ReactNode } from 'react'
 import {
+  Button,
   IconChevronLeftOutlineRegular,
   IconChevronRightOutlineRegular,
   IconLinkOutlineRegular,
@@ -44,7 +45,7 @@ function useBrowserDraft(url: string | undefined, revision: number): readonly [s
 
 /** Render provider-neutral navigation state and optional controls. */
 export function BrowserBody(props: BrowserBodyProps): ReactNode {
-  const { mount, loadUrl, goBack, goForward, reload, setSandbox, useBrowserState, useStore, useTabInfo, t } = props
+  const { mount, loadUrl, restore, goBack, goForward, reload, setSandbox, useBrowserState, useStore, useTabInfo, t } = props
   const { tab } = useTabInfo()
   const saved = useStore(state => state.byTab[tab.id])
   const initial = useRef(saved)
@@ -53,7 +54,8 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
   const [mountEpoch, setMountEpoch] = useState(0)
   const state = useBrowserState(tab.id)
   const frame = state?.frame ?? EMPTY_FRAME
-  const target = frame.target ?? currentBrowserTarget(initial.current)
+  const restoreTarget = state === undefined ? currentBrowserTarget(initial.current) : state.restoreTarget
+  const target = frame.target ?? restoreTarget
   const [draft, setDraft] = useBrowserDraft(target?.url ?? initialUrl.current, state?.addressRevision ?? 0)
 
   useLayoutEffect(() => {
@@ -110,7 +112,15 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
       {failure !== undefined && <div className={css.failure} role="alert">{t(`error.${failure}`)}</div>}
       <div className={css.content} aria-busy={frame.loading}>
         <div id={viewportId} className={css.viewport} aria-label={t('type.label')} />
-        {(target === undefined || frame.loading) && error === undefined && <div className={css.placeholder}>
+        {restoreTarget !== undefined && <section className={css.restore} aria-label={t('restore.previous')}>
+          <p className={css.restoreLabel}>{t('restore.previous')}</p>
+          <p className={css.restoreTitle}>{restoreTarget.title}</p>
+          <p className={css.restoreUrl}>{restoreTarget.url}</p>
+          <Button variant="primary" size="sm" disabled={mountEpoch === 0} onClick={() => { restore(tab.id) }}>
+            {t('restore.action')}
+          </Button>
+        </section>}
+        {restoreTarget === undefined && (target === undefined || frame.loading) && error === undefined && <div className={css.placeholder}>
           <div className={css.start}>{t(target === undefined ? 'start' : 'loading')}</div>
         </div>}
       </div>

From 37df1ea3759581c335ee848b9fbc0b9b5e8fad64 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 01:47:20 +0800
Subject: [PATCH 50/62] fix(browser): separate desktop types from client
 compilation

---
 ...26-09-20-desktop-browser-webview.i18n.yaml |   4 +-
 .../2026-09-20-desktop-browser-webview.md     |   4 +-
 .../2026-09-20-desktop-browser-webview.zh.md  |   4 +-
 apps/desktop/src/browser-guests.ts            |   2 +-
 apps/desktop/src/ipc.ts                       |   2 +-
 apps/desktop/src/preload-browser.ts           |   2 +-
 apps/desktop/tsconfig.json                    |   2 +-
 packages/client/ui-chat/tsconfig.json         |   2 +-
 .../client/ui-sidebar-browser/package.json    |   6 +-
 .../src/client/browser/ElectronWebViewImpl.ts |   2 +-
 .../ui-sidebar-browser/src/client/index.ts    |   2 +-
 .../ui-sidebar-browser/src/client/pages.ts    |   2 +-
 .../view/ElectronWebviewPresentation.ts       |   2 +-
 .../src/{desktop.ts => types.ts}              |   2 +-
 .../tests/apply.client.spec.ts                |  18 ++-
 .../tests/apply.host.spec.ts                  |   6 +
 .../tests/browser-body.client.spec.tsx        |  68 +++++-----
 .../tests/browser-controller.client.spec.ts   | 124 +++++++++++-------
 .../tests/browser-frame.client.spec.ts        |  74 ++++++-----
 .../tests/browser-navigation.client.spec.ts   |   9 +-
 .../ui-sidebar-browser/tsconfig.client.json   |  26 ++++
 .../ui-sidebar-browser/tsconfig.host.json     |  16 +++
 .../client/ui-sidebar-browser/tsconfig.json   |  22 +---
 .../ui-sidebar-browser/tsdown.config.ts       |   2 +-
 .../tests/tab-info.client.spec.tsx            |   3 +-
 tsconfig.base.json                            |   2 +-
 tsconfig.client.json                          |   2 +-
 tsconfig.host.json                            |   4 +-
 28 files changed, 249 insertions(+), 165 deletions(-)
 rename packages/client/ui-sidebar-browser/src/{desktop.ts => types.ts} (92%)
 create mode 100644 packages/client/ui-sidebar-browser/tests/apply.host.spec.ts
 create mode 100644 packages/client/ui-sidebar-browser/tsconfig.client.json
 create mode 100644 packages/client/ui-sidebar-browser/tsconfig.host.json

diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
index 7f256eb541..8152bfbd4c 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
-2026-09-20-desktop-browser-webview.md: 869308f2105f5145f22d3d4041b9f59fc6f36aa1
-2026-09-20-desktop-browser-webview.zh.md: 73299056d840b9e3f888f230514b38d704f33153
+2026-09-20-desktop-browser-webview.md: 2b2b86ba08a7c10321834c2f78d6fe77cdcda7e4
+2026-09-20-desktop-browser-webview.zh.md: 3e0ed130c58fe197804a2cb835d82446f7e21f5c
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
index 869308f210..2b2b86ba08 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -22,7 +22,9 @@ The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retain
 - The Desktop Browser type declares `keepMounted`. Sidebar retains its DOM ancestors across hiding and docking; CSS owns layout and clipping. Docking gestures disable guest pointer input, and body-local drop hints use normal stacking. A physical unmount cancels pending attachment and releases the guest; a later mount recreates it from the known address.
 - Tab occurrence cancellation, plugin unload and window destruction release guests. Guest crashes leave a retryable failure; Reload creates a new guest. Application restart offers the saved title and URL for explicit restoration; it creates no guest until the user restores or submits an address. Page memory and native history are not restored.
 
-The package's type-only `./desktop` entry declares the lease, reservation, open-request and bridge types shared by the main process, preload and Client. Preload exposes scoped operations and callbacks, not raw IPC or Electron objects.
+The standard `./types` subpath exports the shared lease, reservation, open-request and bridge declarations through a declaration-only `types` condition; Desktop consumers use `import type`. There is no runtime default, extra JavaScript artifact or early Host bundling for these declarations. Preload exposes scoped operations and callbacks, not raw IPC or Electron objects.
+
+Browser has separate Host and Client compiler programs. Desktop and the Host aggregate reference only `tsconfig.host.json`, which compiles the package root and shared bridge declarations; the Client aggregate references `tsconfig.client.json` for the browser implementation. The package root tsconfig is solution-only. This keeps Client consumers of generated `/remote` declarations out of the Host compilation that precedes Typert generation.
 
 ### Storage ownership
 
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
index 73299056d8..3e0ed130c5 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -22,7 +22,9 @@ Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`；Web 保留显式启用
 - Desktop Browser 类型声明 `keepMounted`。Sidebar 在隐藏和停靠切换时保留其 DOM 祖先，CSS 负责布局与裁剪。停靠手势期间禁用 guest 指针输入，Body 内的放置提示使用普通层叠。物理卸载会取消未完成的挂载并释放 guest，之后重新挂载时从已知地址重建。
 - tab occurrence 取消、插件卸载与窗口销毁会释放 guest。guest 崩溃留下可重试的失败状态；刷新创建新 guest。应用重启展示保存的标题与 URL，等待显式恢复；用户恢复或提交地址之前不创建 guest。不恢复页面内存或原生 history。
 
-包内仅含类型的 `./desktop` 入口声明主进程、preload 和 Client 共用的租约、申请结果、打开请求与桥接类型。preload 只暴露限定范围的操作与回调，不暴露原始 IPC 或 Electron 对象。
+标准 `./types` 子路径通过仅指向声明文件的 `types` 条件导出共享的租约、申请结果、打开请求与桥接声明，Desktop 消费方使用 `import type`。这些声明没有运行时 default、额外 JavaScript 产物或提前进行的 Host 打包。preload 只暴露限定范围的操作与回调，不暴露原始 IPC 或 Electron 对象。
+
+Browser 分别拥有 Host 与 Client 编译程序。Desktop 和 Host 聚合配置只引用 `tsconfig.host.json`，编译包根与共享桥接声明；Client 聚合配置通过 `tsconfig.client.json` 编译浏览器实现。包根 tsconfig 只作为 solution。这样，依赖生成 `/remote` 声明的 Client 消费方不会进入 Typert 生成之前的 Host 编译阶段。
 
 ### Storage ownership
 
diff --git a/apps/desktop/src/browser-guests.ts b/apps/desktop/src/browser-guests.ts
index bdd6bf7209..d3824dd902 100644
--- a/apps/desktop/src/browser-guests.ts
+++ b/apps/desktop/src/browser-guests.ts
@@ -1,7 +1,7 @@
 /** Main-process ownership and fixed isolation policy for Sidebar webview guests. */
 import { randomUUID } from 'node:crypto'
 import { app, session, type BrowserWindow, type Session, type WebContents } from 'electron'
-import type { DesktopBrowserLeaseId, DesktopBrowserOpenRequest, DesktopBrowserReservation } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
+import type { DesktopBrowserLeaseId, DesktopBrowserOpenRequest, DesktopBrowserReservation } from '@deepseek-ai/dsh-client-ui-sidebar-browser/types'
 import { DESKTOP_IPC } from './ipc.ts'
 
 interface GuestLease {
diff --git a/apps/desktop/src/ipc.ts b/apps/desktop/src/ipc.ts
index f45b0a7a23..ea77749109 100644
--- a/apps/desktop/src/ipc.ts
+++ b/apps/desktop/src/ipc.ts
@@ -1,7 +1,7 @@
 /** Typed preload operations exposed only by the Electron shell. */
 
 import type { IpcMainInvokeEvent } from 'electron'
-import type { DesktopBrowserBridge } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
+import type { DesktopBrowserBridge } from '@deepseek-ai/dsh-client-ui-sidebar-browser/types'
 
 /** IPC channel names kept private to the desktop application bundle. */
 export const DESKTOP_IPC = {
diff --git a/apps/desktop/src/preload-browser.ts b/apps/desktop/src/preload-browser.ts
index 75b0869055..fadf2f1ce1 100644
--- a/apps/desktop/src/preload-browser.ts
+++ b/apps/desktop/src/preload-browser.ts
@@ -1,6 +1,6 @@
 /** Lease-scoped browser operations and one main-process event subscription per window. */
 import { ipcRenderer } from 'electron'
-import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '@deepseek-ai/dsh-client-ui-sidebar-browser/desktop'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '@deepseek-ai/dsh-client-ui-sidebar-browser/types'
 import { DESKTOP_IPC } from './ipc.ts'
 
 /** @returns browser operations that expose neither IPC nor Electron objects. */
diff --git a/apps/desktop/tsconfig.json b/apps/desktop/tsconfig.json
index ed6f41ce6e..ad14bd9bb9 100644
--- a/apps/desktop/tsconfig.json
+++ b/apps/desktop/tsconfig.json
@@ -7,7 +7,7 @@
   "include": ["src"],
   "references": [
     { "path": "../../packages/boot/app-boot" },
-    { "path": "../../packages/client/ui-sidebar-browser" },
+    { "path": "../../packages/client/ui-sidebar-browser/tsconfig.host.json" },
     { "path": "../../packages/util/home-paths" }
   ]
 }
diff --git a/packages/client/ui-chat/tsconfig.json b/packages/client/ui-chat/tsconfig.json
index a004571d35..92dffe85b0 100644
--- a/packages/client/ui-chat/tsconfig.json
+++ b/packages/client/ui-chat/tsconfig.json
@@ -90,7 +90,7 @@
       "path": "../ui-session"
     },
     {
-      "path": "../ui-sidebar-browser"
+      "path": "../ui-sidebar-browser/tsconfig.client.json"
     },
     {
       "path": "../ui-sidebar-right"
diff --git a/packages/client/ui-sidebar-browser/package.json b/packages/client/ui-sidebar-browser/package.json
index bf289be029..a724fd3b63 100644
--- a/packages/client/ui-sidebar-browser/package.json
+++ b/packages/client/ui-sidebar-browser/package.json
@@ -22,9 +22,8 @@
       "types": "./lib/types/client/index.d.ts",
       "default": "./lib/client.js"
     },
-    "./desktop": {
-      "types": "./lib/types/desktop.d.ts",
-      "default": "./lib/desktop.js"
+    "./types": {
+      "types": "./lib/types/types.d.ts"
     },
     "./src/*": "./src/*",
     "./package.json": "./package.json"
@@ -67,7 +66,6 @@
   "files": [
     "lib/index.js",
     "lib/client.js",
-    "lib/desktop.js",
     "lib/types/**/*.d.ts"
   ]
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
index 9ab16bbc83..f8a5ad8a12 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
@@ -1,6 +1,6 @@
 /** Electron navigation and guest lifetime, independent from DOM placement. */
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
-import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../../desktop.ts'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../../types.ts'
 import type { ElectronWebviewPresentation, WebviewElement } from '../view/ElectronWebviewPresentation.ts'
 import { emptyBrowserFrame, type BrowserFrame, type BrowserFrameState, type BrowserLoadError } from './BrowserFrame.ts'
 import type { BrowserPageOptions } from './BrowserPage.ts'
diff --git a/packages/client/ui-sidebar-browser/src/client/index.ts b/packages/client/ui-sidebar-browser/src/client/index.ts
index 135374f63d..bc1be9ae18 100644
--- a/packages/client/ui-sidebar-browser/src/client/index.ts
+++ b/packages/client/ui-sidebar-browser/src/client/index.ts
@@ -10,7 +10,7 @@ import { BrowserTitle } from './view/BrowserTitle.tsx'
 import { createBrowserControllers } from './browser/BrowserController.ts'
 import type { BrowserInjected } from './browser/BrowserController.ts'
 import { createElectronPage, createIframePage } from './pages.ts'
-import type { DesktopBrowserBridge } from '../desktop.ts'
+import type { DesktopBrowserBridge } from '../types.ts'
 import { browserWorkspace } from './browser/workspace.ts'
 import type { BrowserPageFactory } from './browser/BrowserPage.ts'
 import { BROWSER_ID, browserDefinition } from './definition.tsx'
diff --git a/packages/client/ui-sidebar-browser/src/client/pages.ts b/packages/client/ui-sidebar-browser/src/client/pages.ts
index 1a69cd6db1..36fd9033fb 100644
--- a/packages/client/ui-sidebar-browser/src/client/pages.ts
+++ b/packages/client/ui-sidebar-browser/src/client/pages.ts
@@ -1,5 +1,5 @@
 /** Assemble navigation providers and presentation adapters without platform branches in consumers. */
-import type { DesktopBrowserBridge } from '../desktop.ts'
+import type { DesktopBrowserBridge } from '../types.ts'
 import type { BrowserPage, BrowserPageOptions } from './browser/BrowserPage.ts'
 import { IframeImpl } from './browser/IframeImpl.ts'
 import { ElectronWebViewImpl } from './browser/ElectronWebViewImpl.ts'
diff --git a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
index ed5743a079..fc39414d7c 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
+++ b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
@@ -1,5 +1,5 @@
 /** Electron tag DOM inside a Sidebar-owned, stable content container. */
-import type { DesktopBrowserReservation } from '../../desktop.ts'
+import type { DesktopBrowserReservation } from '../../types.ts'
 import type { BrowserPresentation } from './BrowserPresentation.ts'
 import css from './Browser.module.css'
 
diff --git a/packages/client/ui-sidebar-browser/src/desktop.ts b/packages/client/ui-sidebar-browser/src/types.ts
similarity index 92%
rename from packages/client/ui-sidebar-browser/src/desktop.ts
rename to packages/client/ui-sidebar-browser/src/types.ts
index d56b70ee14..932211e13b 100644
--- a/packages/client/ui-sidebar-browser/src/desktop.ts
+++ b/packages/client/ui-sidebar-browser/src/types.ts
@@ -1,4 +1,4 @@
-/** Electron bridge declarations shared by the desktop shell and browser provider. */
+/** Type-only Electron bridge declarations shared by the desktop shell and browser provider. */
 import type { Branded } from '@deepseek-ai/dsh-brand'
 
 /** Main-issued identity of one guest reservation. */
diff --git a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
index f14dee3038..5659489224 100644
--- a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
@@ -1,6 +1,7 @@
 /** Browser type, Slot, locale, and HMR disposal through the real registries. */
-import { describe, expect, it, vi } from 'vitest'
+import { afterEach, describe, expect, it, vi } from 'vitest'
 import { Context } from '@deepseek-ai/cordis'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import { SidebarRightTabRegistry } from '@deepseek-ai/dsh-client-ui-sidebar-right/src/client/tab-registry.ts'
 import { BrowserBody } from '../src/client/view/BrowserBody.tsx'
 import { BrowserTitle } from '../src/client/view/BrowserTitle.tsx'
@@ -8,7 +9,12 @@ import type { BrowserInjected } from '../src/client/browser/BrowserController.ts
 import { BROWSER_ID, BROWSER_KIND } from '../src/client/definition.tsx'
 import { apply, inject } from '../src/client/index.ts'
 import { en, zh } from '../src/client/locales.ts'
-import { apply as hostApply } from '../src/index.ts'
+
+const contexts: Context[] = []
+
+afterEach(async () => {
+  await Promise.all(contexts.splice(0).map(ctx => ctx.fiber.dispose()))
+})
 
 interface Recorded {
   name: string
@@ -21,6 +27,7 @@ interface Recorded {
 
 async function boot() {
   const ctx = new Context()
+  contexts.push(ctx)
   const tabs = new SidebarRightTabRegistry(ctx)
   const registered: Recorded[] = []
   const slots = {
@@ -40,6 +47,7 @@ async function boot() {
     }),
   }
   ctx.provide('sidebarRightTabs', tabs as never)
+  ctx.provide('sidebarRight', { openTabs: createSnapshotStore([]) } as never)
   ctx.provide('slots', slots as never)
   ctx.provide('locale', locale as never)
   const fiber = ctx.plugin({ inject: [...inject], apply })
@@ -48,10 +56,6 @@ async function boot() {
 }
 
 describe('ui-sidebar-browser apply', () => {
-  it('keeps the Host Loader entry inert', () => {
-    expect(hostApply).not.toThrow()
-  })
-
   it('registers a multi-instance builtin and its body and title', async () => {
     const { tabs, registered, dictionaries } = await boot()
     const definition = tabs.get(BROWSER_KIND)
@@ -72,7 +76,7 @@ describe('ui-sidebar-browser apply', () => {
     expect(registered[0]?.inject).toBeTypeOf('function')
     const injectFace = registered[0]?.inject as ((sessionId: string, actions: unknown) => unknown)
     const browser = injectFace('session', { replace: vi.fn(), forget: vi.fn() }) as BrowserInjected
-    expect(browser.keyedHooks.browserFrame('missing')).toBeUndefined()
+    expect(browser.keyedHooks.browserState('missing')).toBeUndefined()
     expect(typeof browser.mount).toBe('function')
   })
 
diff --git a/packages/client/ui-sidebar-browser/tests/apply.host.spec.ts b/packages/client/ui-sidebar-browser/tests/apply.host.spec.ts
new file mode 100644
index 0000000000..419889503c
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tests/apply.host.spec.ts
@@ -0,0 +1,6 @@
+import { expect, it } from 'vitest'
+import { apply } from '../src/index.ts'
+
+it('keeps the Browser Host Loader entry inert', () => {
+  expect(apply).not.toThrow()
+})
diff --git a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
index 4615a0a0d4..e9327de0ad 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
+++ b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
@@ -1,19 +1,22 @@
 // @vitest-environment jsdom
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { act, cleanup, fireEvent, render, waitFor } from '@testing-library/react'
+import { cleanup, fireEvent, render, waitFor } from '@testing-library/react'
 import { useSyncExternalStore } from 'react'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
-import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
-import { createBrowserControllers } from '../src/client/browser/BrowserController.ts'
-import type { BrowserFrameState } from '../src/client/browser/BrowserFrame.ts'
+import type { PaneId, TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+import { createBrowserControllers, type BrowserControllerState, type BrowserInjected } from '../src/client/browser/BrowserController.ts'
 import { createBrowserStore } from '../src/client/browser/store.ts'
 import type { BrowserBodyProps } from '../src/client/view/BrowserBody.tsx'
-import { BrowserBody, WEB_BROWSER_SANDBOX } from '../src/client/view/BrowserBody.tsx'
+import { BrowserBody } from '../src/client/view/BrowserBody.tsx'
+import { WEB_BROWSER_SANDBOX } from '../src/client/view/IframePresentation.ts'
+import { createIframePage } from '../src/client/pages.ts'
 import { zh } from '../src/client/locales.ts'
 
 const SESSION = 'session' as SessionId
 const TAB = 'tab' as TabId
+const messages: Readonly<Record<string, string>> = zh
 const lifetimes = new Set<AbortController>()
+const controllers: BrowserInjected[] = []
 let mountSequence = 0
 
 function hookOf<T>(store: { subscribe(listener: () => void): () => void; getSnapshot(): T }) {
@@ -25,51 +28,52 @@ function hookOf<T>(store: { subscribe(listener: () => void): () => void; getSnap
   }
 }
 
-const absentFrame = {
+const absentState = {
   subscribe: (_listener: () => void): (() => void) => () => {},
-  getSnapshot: (): BrowserFrameState | undefined => undefined,
+  getSnapshot: (): BrowserControllerState | undefined => undefined,
 }
 
 function mountBrowser(navigation?: { readonly url?: string }) {
   const store = createBrowserStore().create(`browser-body-test-${String(++mountSequence)}`)
   const lifetime = new AbortController()
   lifetimes.add(lifetime)
-  const injected = createBrowserControllers(store.actions)
+  const injected = createBrowserControllers(store.actions, createIframePage, () => true)
+  controllers.push(injected)
   const { keyedHooks, ...commands } = injected
-  const props = {
+  const tabActions = { openResource: vi.fn(), openTab: vi.fn(), close: vi.fn() }
+  const props: Pick<BrowserBodyProps, 'sessionId' | 'useTabInfo' | 'useStore' | 'actions' | 't' | 'useBrowserState'>
+    & Omit<BrowserInjected, 'keyedHooks'> = {
     sessionId: SESSION,
-    useSessions: vi.fn(),
-    useResource: vi.fn(),
-    useWorkspaces: vi.fn(),
-    usePanelInfo: vi.fn(),
-    useSessionPendingInteraction: vi.fn(),
     useTabInfo: () => ({
-      sidebar: { expanded: true, fullscreen: false }, panel: { id: 'pane' },
+      sidebar: { expanded: true, fullscreen: false }, panel: { id: 'pane' as PaneId },
       tab: {
         id: TAB, kind: 'browser', title: 'Browser', contentId: 'sidebar://browser/1', visible: true,
         navigation: { address: 'sidebar://browser/1', params: navigation, revision: 0 },
         signal: lifetime.signal,
-        actions: { openResource: vi.fn(), openTab: vi.fn(), close: vi.fn() },
+        actions: tabActions,
       },
     }),
     useStore: hookOf(store),
     actions: store.actions,
-    t: (key: keyof typeof zh, params?: Record<string, unknown>) => params === undefined
-      ? zh[key] : zh[key].replace('{message}', String(params.message)),
-    ...commands,
-    useBrowserFrame: (key: string) => {
-      const frame = keyedHooks.browserFrame(key) ?? absentFrame
-      return useSyncExternalStore(frame.subscribe, frame.getSnapshot)
+    t: (key, params) => {
+      const template = messages[key] ?? key
+      return params === undefined ? template : template.replace(/\{(\w+)\}/g, (_match, name: string) => String(params[name]))
     },
-  } as unknown as BrowserBodyProps
-  const renderBody = () => render(<BrowserBody {...props} />)
+    ...commands,
+    useBrowserState: (key: string) => {
+      const state = keyedHooks.browserState(key) ?? absentState
+      return useSyncExternalStore(state.subscribe, state.getSnapshot)
+    },
+  }
+  const renderBody = () => render(<BrowserBody {...props as BrowserBodyProps} />)
   return {
     view: renderBody(), remount: renderBody, store, lifetime, injected,
   }
 }
 
-afterEach(() => {
+afterEach(async () => {
   cleanup()
+  await Promise.all(controllers.splice(0).map(controller => controller.dispose()))
   for (const lifetime of lifetimes) lifetime.abort()
   lifetimes.clear()
   localStorage.clear()
@@ -169,15 +173,15 @@ describe('BrowserBody', () => {
     fireEvent.change(input, { target: { value: 'https://example.com/one' } })
     fireEvent.submit(input.closest('form')!)
     await waitFor(() => { expect(mounted.view.container.querySelector('iframe')).not.toBeNull() })
-    const failedRevision = mounted.store.getSnapshot().byTab[TAB]!.request!.revision
+    const failedFrame = mounted.view.container.querySelector('iframe')!
 
-    act(() => { mounted.injected.reportLoadFailed(TAB, failedRevision) })
-    expect(mounted.injected.keyedHooks.browserFrame(TAB)?.getSnapshot().loadFailed).toBe(true)
-    await waitFor(() => { expect(mounted.view.getByText(zh['web.loadFailed'])).toBeDefined() })
+    fireEvent.error(failedFrame)
+    expect(mounted.injected.keyedHooks.browserState(TAB)?.getSnapshot().frame.error).toBeDefined()
+    await waitFor(() => { expect(mounted.view.getByText(zh['load.failed'])).toBeDefined() })
     fireEvent.click(mounted.view.getByRole('button', { name: zh.reload }))
-    await waitFor(() => { expect(mounted.view.queryByText(zh['web.loadFailed'])).toBeNull() })
-    act(() => { mounted.injected.reportLoadFailed(TAB, failedRevision) })
-    expect(mounted.view.queryByText(zh['web.loadFailed'])).toBeNull()
+    await waitFor(() => { expect(mounted.view.queryByText(zh['load.failed'])).toBeNull() })
+    fireEvent.error(failedFrame)
+    expect(mounted.view.queryByText(zh['load.failed'])).toBeNull()
   })
 
   it('loads loopback under the default sandbox and keeps it across sandbox changes', async () => {
diff --git a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
index 3801351adb..5c513a557f 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
@@ -3,10 +3,14 @@ import { afterEach, describe, expect, it, vi } from 'vitest'
 import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import { BrowserController, createBrowserControllers } from '../src/client/browser/BrowserController.ts'
 import { createBrowserStore } from '../src/client/browser/store.ts'
+import { createIframePage } from '../src/client/pages.ts'
 
 const TAB = 'tab' as TabId
 const APP = 'https://dsh.example'
 const lifetimes = new Set<AbortController>()
+const disposables: { dispose(): Promise<void> }[] = []
+const hosts: HTMLElement[] = []
+let sequence = 0
 
 function lifetime(): AbortController {
   const controller = new AbortController()
@@ -14,49 +18,74 @@ function lifetime(): AbortController {
   return controller
 }
 
-afterEach(() => {
+function harness() {
+  const id = `browser-controller-test-${String(++sequence)}`
+  const store = createBrowserStore().create(id)
+  let open = true
+  const face = createBrowserControllers(store.actions, createIframePage, () => open)
+  disposables.push(face)
+  const host = document.createElement('div')
+  host.id = id
+  hosts.push(host)
+  document.body.append(host)
+  const mount = (signal: AbortSignal): (() => void) => face.mount({
+    tabId: TAB, signal, viewportId: id, applicationOrigin: APP,
+    initial: store.getSnapshot().byTab[TAB], initialUrl: undefined, openTab: vi.fn(),
+  })
+  const iframe = (): HTMLIFrameElement => {
+    const element = host.querySelector('iframe')
+    if (element === null) throw new Error('expected a mounted iframe')
+    return element
+  }
+  return { store, face, mount, iframe, close: () => { open = false } }
+}
+
+afterEach(async () => {
+  await Promise.all(disposables.splice(0).map(value => value.dispose()))
   for (const controller of lifetimes) controller.abort()
   lifetimes.clear()
+  for (const host of hosts.splice(0)) host.remove()
   localStorage.clear()
   vi.restoreAllMocks()
 })
 
 describe('BrowserController', () => {
-  it('ignores navigation commands after its tab occurrence ends', () => {
+  it('ignores navigation commands after its tab occurrence ends', async () => {
     const store = createBrowserStore().create('browser-controller-ended-test')
     const tabLifetime = lifetime()
     const controller = new BrowserController({
       tabId: TAB, signal: tabLifetime.signal, applicationOrigin: APP, actions: store.actions,
+      initial: undefined, createPage: createIframePage, openTab: vi.fn(),
     })
+    disposables.push(controller)
     tabLifetime.abort()
+    await controller.dispose()
 
     controller.loadUrl('https://ignored.example/')
     controller.goBack()
     controller.goForward()
     controller.reload()
-    controller.frame.reportLoaded(1)
+    expect(controller.getSnapshot().frame.target).toBeUndefined()
     expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
   })
 
   it('owns the four navigation commands and frame load state', () => {
-    const store = createBrowserStore().create('browser-controller-test')
-    const face = createBrowserControllers(store.actions)
+    const { store, face, mount, iframe, close } = harness()
     const tabLifetime = lifetime()
-    face.mount(TAB, tabLifetime.signal, APP)
-    const frame = face.keyedHooks.browserFrame(TAB)!
-    face.mount(TAB, tabLifetime.signal, APP)
-    expect(face.keyedHooks.browserFrame(TAB)).toBe(frame)
+    mount(tabLifetime.signal)
+    const state = face.keyedHooks.browserState(TAB)!
+    mount(tabLifetime.signal)
+    expect(face.keyedHooks.browserState(TAB)).toBe(state)
     face.goBack(TAB)
     face.goForward(TAB)
     face.reload(TAB)
 
     face.loadUrl(TAB, 'https://example.test/one')
-    const first = frame.getSnapshot().document!
+    const first = iframe()
     expect(first.src).toBe('https://example.test/one')
-    face.reportLoaded(TAB, first.revision - 1)
-    face.reportLoaded(TAB, first.revision)
+    first.dispatchEvent(new Event('load'))
     expect(store.getSnapshot().byTab[TAB]?.navigation.status).toBe('known')
-    face.reportLoaded(TAB, first.revision)
+    first.dispatchEvent(new Event('load'))
     expect(store.getSnapshot().byTab[TAB]?.navigation.status).toBe('unknown')
     face.goBack(TAB)
     face.goForward(TAB)
@@ -64,79 +93,86 @@ describe('BrowserController', () => {
 
     face.loadUrl(TAB, 'https://example.test/two')
     face.goBack(TAB)
-    expect(frame.getSnapshot().document?.target.url).toBe('https://example.test/one')
+    expect(state.getSnapshot().frame.target?.url).toBe('https://example.test/one')
     face.goForward(TAB)
-    expect(frame.getSnapshot().document?.target.url).toBe('https://example.test/two')
+    expect(state.getSnapshot().frame.target?.url).toBe('https://example.test/two')
     const beforeReload = store.getSnapshot().byTab[TAB]!.request!.revision
     face.reload(TAB)
     expect(store.getSnapshot().byTab[TAB]?.request?.revision).toBe(beforeReload + 1)
     face.loadUrl(TAB, 'https://example.test/two')
     expect(store.getSnapshot().byTab[TAB]?.request?.revision).toBe(beforeReload + 2)
 
+    close()
     tabLifetime.abort()
     expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
-    face.reportLoaded(TAB, first.revision)
+    first.dispatchEvent(new Event('load'))
     face.loadUrl(TAB, 'https://ignored.example/')
     face.goBack(TAB)
     face.goForward(TAB)
     face.reload(TAB)
+    expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
+    expect(face.keyedHooks.browserState(TAB)).toBeUndefined()
   })
 
   it('does not let an old occurrence delete a replacement controller', () => {
-    const store = createBrowserStore().create('browser-controller-replacement-test')
-    const face = createBrowserControllers(store.actions)
+    const { store, face, mount } = harness()
     const first = lifetime()
     const second = lifetime()
-    face.mount(TAB, first.signal, APP)
-    const original = face.keyedHooks.browserFrame(TAB)
-    face.mount(TAB, second.signal, APP)
-    const replacement = face.keyedHooks.browserFrame(TAB)
+    mount(first.signal)
+    const original = face.keyedHooks.browserState(TAB)
+    mount(second.signal)
+    const replacement = face.keyedHooks.browserState(TAB)
     expect(replacement).not.toBe(original)
     first.abort()
     expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
     face.loadUrl(TAB, 'https://example.test/')
     expect(store.getSnapshot().byTab[TAB]).toBeDefined()
-    face.mount(TAB, second.signal, APP)
-    expect(face.keyedHooks.browserFrame(TAB)).toBe(replacement)
+    mount(second.signal)
+    expect(face.keyedHooks.browserState(TAB)).toBe(replacement)
   })
 
   it('loads loopback under sandbox and reloads it across sandbox changes', () => {
-    const store = createBrowserStore().create('browser-controller-loopback-test')
-    const face = createBrowserControllers(store.actions)
+    const { store, face, mount, iframe } = harness()
     const tabLifetime = lifetime()
-    face.mount(TAB, tabLifetime.signal, APP)
-    const frame = face.keyedHooks.browserFrame(TAB)!
+    mount(tabLifetime.signal)
+    const state = face.keyedHooks.browserState(TAB)!
 
     face.loadUrl(TAB, 'http://localhost:5173/app')
-    expect(frame.getSnapshot()).toMatchObject({
-      sandboxed: true,
-      document: { src: 'http://localhost:5173/app' },
+    expect(state.getSnapshot().frame).toMatchObject({
+      sandboxEnabled: true,
+      target: { url: 'http://localhost:5173/app' },
     })
     const beforeToggle = store.getSnapshot().byTab[TAB]!.request!.revision
 
-    face.toggleSandbox(TAB)
-    expect(frame.getSnapshot().sandboxed).toBe(false)
-    expect(frame.getSnapshot().document?.src).toBe('http://localhost:5173/app')
+    face.setSandbox(TAB, false)
+    expect(state.getSnapshot().frame.sandboxEnabled).toBe(false)
+    expect(iframe().src).toBe('http://localhost:5173/app')
     expect(store.getSnapshot().byTab[TAB]?.request?.revision).toBe(beforeToggle + 1)
 
-    face.toggleSandbox(TAB)
-    expect(frame.getSnapshot()).toMatchObject({
-      sandboxed: true,
-      document: { src: 'http://localhost:5173/app' },
+    face.setSandbox(TAB, true)
+    expect(state.getSnapshot().frame).toMatchObject({
+      sandboxEnabled: true,
+      target: { url: 'http://localhost:5173/app' },
     })
     expect(store.getSnapshot().byTab[TAB]?.request?.revision).toBe(beforeToggle + 2)
   })
 
   it('loads public HTTP without changing the sandbox policy', () => {
-    const store = createBrowserStore().create('browser-controller-http-test')
-    const face = createBrowserControllers(store.actions)
+    const { face, mount } = harness()
     const tabLifetime = lifetime()
-    face.mount(TAB, tabLifetime.signal, APP)
+    mount(tabLifetime.signal)
 
     face.loadUrl(TAB, 'http://example.test/path')
-    expect(face.keyedHooks.browserFrame(TAB)?.getSnapshot()).toMatchObject({
-      sandboxed: true,
-      document: { src: 'http://example.test/path' },
+    const state = face.keyedHooks.browserState(TAB)!
+    expect(state.getSnapshot().frame).toMatchObject({
+      sandboxEnabled: true,
+      target: { url: 'http://example.test/path' },
     })
+    const beforeFailure = state.getSnapshot().frame
+    face.loadUrl(TAB, 'javascript:alert(1)')
+    expect(state.getSnapshot().addressFailure).toBe('protocol')
+    expect(state.getSnapshot().frame).toBe(beforeFailure)
+    face.reload(TAB)
+    expect(state.getSnapshot().addressFailure).toBeUndefined()
   })
 })
diff --git a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
index 5660e586c0..351de080fd 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
@@ -1,41 +1,51 @@
-import { describe, expect, it, vi } from 'vitest'
-import { IframeImpl } from '../src/client/browser/BrowserFrame.ts'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { IframeImpl } from '../src/client/browser/IframeImpl.ts'
+import { IframePresentation } from '../src/client/view/IframePresentation.ts'
+
+const frames: IframeImpl[] = []
+
+afterEach(async () => {
+  await Promise.all(frames.splice(0).map(frame => frame.dispose()))
+})
 
 describe('IframeImpl', () => {
-  it('owns transient sandbox mode and prepared document state', () => {
-    const changed = vi.fn<(sandboxed: boolean) => void>()
-    const loaded = vi.fn<(revision: number) => void>()
-    const frame = new IframeImpl(changed, loaded)
+  it('owns transient sandbox mode and revision-scoped load state', async () => {
+    const persist = vi.fn()
+    const presentation = new IframePresentation({ loaded: vi.fn(), failed: vi.fn(), remounted: vi.fn() })
+    const frame = new IframeImpl({ initial: undefined, persist, openRequested: vi.fn() }, presentation)
+    frames.push(frame)
     const listener = vi.fn()
     const unsubscribe = frame.subscribe(listener)
+    try {
+      frame.sandbox.setEnabled(false)
+      expect(frame.getSnapshot().sandboxEnabled).toBe(false)
+      expect(frame.getSnapshot().target).toBeUndefined()
 
-    frame.toggleSandbox()
-    expect(frame.getSnapshot().sandboxed).toBe(false)
-    expect(changed).toHaveBeenCalledWith(false)
+      const target = { kind: 'https' as const, url: 'https://example.test/', title: 'example.test' }
+      frame.handleLoadFailed(1)
+      expect(frame.getSnapshot().error).toBeUndefined()
+      frame.loadUrl(target)
+      frame.handleLoadFailed(0)
+      expect(frame.getSnapshot().error).toBeUndefined()
+      frame.handleLoadFailed(1)
+      frame.handleLoadFailed(1)
+      expect(frame.getSnapshot()).toMatchObject({ target, error: { code: undefined, description: undefined }, loading: false })
+      frame.handleLoaded(1)
+      expect(persist).toHaveBeenLastCalledWith(expect.objectContaining({ navigation: { status: 'known', revision: 1 } }))
+      frame.reload()
+      expect(frame.getSnapshot()).toMatchObject({ target, error: undefined, loading: true })
+      frame.handleLoadFailed(1)
+      expect(frame.getSnapshot().error).toBeUndefined()
+      expect(listener).toHaveBeenCalled()
 
-    const document = {
-      target: { kind: 'https' as const, url: 'https://example.test/', title: 'example.test' },
-      src: 'https://example.test/',
-      revision: 4,
+      await frame.dispose()
+      const stopped = frame.getSnapshot()
+      frame.handleLoadFailed(2)
+      frame.handleLoaded(2)
+      frame.reload()
+      expect(frame.getSnapshot()).toBe(stopped)
+    } finally {
+      unsubscribe()
     }
-    frame.reportLoadFailed(4)
-    expect(frame.getSnapshot().loadFailed).toBe(false)
-    frame.setDocument(document)
-    frame.reportLoadFailed(3)
-    expect(frame.getSnapshot().loadFailed).toBe(false)
-    frame.reportLoadFailed(4)
-    frame.reportLoadFailed(4)
-    expect(frame.getSnapshot().loadFailed).toBe(true)
-    frame.reportLoaded(4)
-    expect(loaded).toHaveBeenCalledWith(4)
-    frame.setDocument({ ...document, revision: 5 })
-    expect(frame.getSnapshot().loadFailed).toBe(false)
-    frame.clearDocument()
-    expect(frame.getSnapshot().document).toBeUndefined()
-    frame.reportLoadFailed(5)
-    expect(frame.getSnapshot().loadFailed).toBe(false)
-    frame.clearDocument()
-    expect(listener).toHaveBeenCalled()
-    unsubscribe()
   })
 })
diff --git a/packages/client/ui-sidebar-browser/tests/browser-navigation.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-navigation.client.spec.ts
index cce1f9a0a1..d6d2b36762 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-navigation.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-navigation.client.spec.ts
@@ -51,19 +51,14 @@ describe('BrowserNavigation', () => {
     expect(navigation.snapshot.navigation).toEqual({ status: 'loading', revision: reload.revision })
   })
 
-  it('leaves address failures outside navigation', () => {
+  it('ignores frame observations before a controlled request', () => {
     const navigation = new BrowserNavigation()
     navigation.frameLoaded(1)
+    expect(navigation.snapshot).toEqual(BrowserNavigation.empty())
     navigation.navigate(httpsTarget(1))
     const revision = navigation.snapshot.request!.revision
     expect(navigation.snapshot.failure).toBeUndefined()
     navigation.frameLoaded(revision)
     expect(navigation.snapshot.navigation).toEqual({ status: 'known', revision })
-
-    navigation.addressFailed('invalid')
-    expect(navigation.snapshot).toMatchObject({
-      navigation: { status: 'known', revision },
-      failure: { kind: 'address', reason: 'invalid' },
-    })
   })
 })
diff --git a/packages/client/ui-sidebar-browser/tsconfig.client.json b/packages/client/ui-sidebar-browser/tsconfig.client.json
new file mode 100644
index 0000000000..82b0c48f2c
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tsconfig.client.json
@@ -0,0 +1,26 @@
+{
+  "extends": "../../../tsconfig.base.client.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types",
+    "tsBuildInfoFile": "lib/tsconfig.client.tsbuildinfo"
+  },
+  "include": [
+    "src/client",
+    "src/types.ts",
+    "src/css-modules.d.ts"
+  ],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../api/workspace-controller/tsconfig.client.json" },
+    { "path": "../../util/brand" },
+    { "path": "../locale" },
+    { "path": "../store" },
+    { "path": "../ui-dockkit" },
+    { "path": "../ui-primitives" },
+    { "path": "../ui-renderer" },
+    { "path": "../ui-session" },
+    { "path": "../ui-sidebar-right" },
+    { "path": "../ui-slots" }
+  ]
+}
diff --git a/packages/client/ui-sidebar-browser/tsconfig.host.json b/packages/client/ui-sidebar-browser/tsconfig.host.json
new file mode 100644
index 0000000000..20cb732d2f
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tsconfig.host.json
@@ -0,0 +1,16 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types",
+    "tsBuildInfoFile": "lib/tsconfig.host.tsbuildinfo"
+  },
+  "files": [
+    "src/index.ts",
+    "src/types.ts"
+  ],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../util/brand" }
+  ]
+}
diff --git a/packages/client/ui-sidebar-browser/tsconfig.json b/packages/client/ui-sidebar-browser/tsconfig.json
index 2747227910..2a0b0e33f7 100644
--- a/packages/client/ui-sidebar-browser/tsconfig.json
+++ b/packages/client/ui-sidebar-browser/tsconfig.json
@@ -1,23 +1,7 @@
 {
-  "extends": "../../../tsconfig.base.client.json",
-  "compilerOptions": {
-    "rootDir": "src",
-    "outDir": "lib/types"
-  },
-  "include": [
-    "src"
-  ],
+  "files": [],
   "references": [
-    { "path": "../../../vendor/cordis" },
-    { "path": "../../api/workspace-controller/tsconfig.client.json" },
-    { "path": "../../util/brand" },
-    { "path": "../locale" },
-    { "path": "../store" },
-    { "path": "../ui-dockkit" },
-    { "path": "../ui-primitives" },
-    { "path": "../ui-renderer" },
-    { "path": "../ui-session" },
-    { "path": "../ui-sidebar-right" },
-    { "path": "../ui-slots" }
+    { "path": "./tsconfig.host.json" },
+    { "path": "./tsconfig.client.json" }
   ]
 }
diff --git a/packages/client/ui-sidebar-browser/tsdown.config.ts b/packages/client/ui-sidebar-browser/tsdown.config.ts
index 9698b8d6c2..229343b169 100644
--- a/packages/client/ui-sidebar-browser/tsdown.config.ts
+++ b/packages/client/ui-sidebar-browser/tsdown.config.ts
@@ -1,3 +1,3 @@
 import { clientBundle } from '../tsdown.client.ts'
 
-export default clientBundle('@deepseek-ai/dsh-client-ui-sidebar-browser', ['lib/types/index.js', 'lib/types/desktop.js'])
+export default clientBundle('@deepseek-ai/dsh-client-ui-sidebar-browser', ['lib/types/index.js'])
diff --git a/packages/client/ui-sidebar-right/tests/tab-info.client.spec.tsx b/packages/client/ui-sidebar-right/tests/tab-info.client.spec.tsx
index 3f36395704..5ce30f033e 100644
--- a/packages/client/ui-sidebar-right/tests/tab-info.client.spec.tsx
+++ b/packages/client/ui-sidebar-right/tests/tab-info.client.spec.tsx
@@ -40,7 +40,8 @@ function harness() {
     const occurrence = domain.occurrence(SESSION, { id: tabId })
     navigationSources.set(tabId, occurrence.navigation)
     return tabInfoFactory(standard, {
-      tabId, title: false, fullscreen: false, signal: occurrence.signal, actions: occurrence.tabActions, useStore, useTabNavigation,
+      tabId, title: false, fullscreen: false, active: true,
+      signal: occurrence.signal, actions: occurrence.tabActions, useStore, useTabNavigation,
     })
   }
   const open = (beforeCommit?: (tabId: TabId) => void): TabId => {
diff --git a/tsconfig.base.json b/tsconfig.base.json
index f8d965bf9b..7df1d33301 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -193,7 +193,7 @@
       "@deepseek-ai/dsh-client-ui-sidebar-documentpreview/client": ["./packages/client/ui-sidebar-documentpreview/src/client"],
       "@deepseek-ai/dsh-client-ui-sidebar-browser": ["./packages/client/ui-sidebar-browser/src"],
       "@deepseek-ai/dsh-client-ui-sidebar-browser/client": ["./packages/client/ui-sidebar-browser/src/client"],
-      "@deepseek-ai/dsh-client-ui-sidebar-browser/desktop": ["./packages/client/ui-sidebar-browser/src/desktop.ts"],
+      "@deepseek-ai/dsh-client-ui-sidebar-browser/types": ["./packages/client/ui-sidebar-browser/src/types.ts"],
       "@deepseek-ai/dsh-api-workspace-files": ["./packages/api/workspace-files/src"],
       "@deepseek-ai/dsh-api-workspace-files/types": ["./packages/api/workspace-files/src/types.ts"],
       "@deepseek-ai/dsh-api-workspace-files/client": ["./packages/api/workspace-files/src/client/index.ts"],
diff --git a/tsconfig.client.json b/tsconfig.client.json
index 08538a0e76..a6ffd07d29 100644
--- a/tsconfig.client.json
+++ b/tsconfig.client.json
@@ -91,7 +91,7 @@
     { "path": "./packages/client/ui-dockkit" },
     { "path": "./packages/client/ui-sidebar-right" },
     { "path": "./packages/client/ui-sidebar-documentpreview/tsconfig.client.json" },
-    { "path": "./packages/client/ui-sidebar-browser" },
+    { "path": "./packages/client/ui-sidebar-browser/tsconfig.client.json" },
     { "path": "./packages/client/ui-sidebar-files" },
     { "path": "./packages/client/ui-jobs" },
     { "path": "./packages/client/ui-schedule" },
diff --git a/tsconfig.host.json b/tsconfig.host.json
index 01cca0cb14..deeb1d8f26 100644
--- a/tsconfig.host.json
+++ b/tsconfig.host.json
@@ -8,8 +8,7 @@
     "rewriteRelativeImportExtensions": false
   },
   "files": [
-    "packages/client/ui-settings-general/src/client/desktop-update-bridge.ts",
-    "packages/client/ui-sidebar-browser/src/index.ts"
+    "packages/client/ui-settings-general/src/client/desktop-update-bridge.ts"
   ],
   "include": [
     "apps/web/product-isolation.ts",
@@ -184,6 +183,7 @@
     { "path": "./packages/experimental/computer-use-cua-driver-mcp" },
     { "path": "./packages/experimental/computer-use-cua-driver-native" },
     { "path": "./packages/client/ui-sidebar-documentpreview/tsconfig.host.json" },
+    { "path": "./packages/client/ui-sidebar-browser/tsconfig.host.json" },
     { "path": "./packages/document/office-to-pdf" },
     { "path": "./packages/client/ui-deliverables/tsconfig.host.json" },
     { "path": "./vendor/cosmokit" },

From 14895262810cedf98831c5959a274d7e6c7649ae Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 01:47:28 +0800
Subject: [PATCH 51/62] fix(desktop): import updater declarations through
 package types

---
 apps/desktop/package.json                     |  1 +
 .../desktop/tests/update-presentation.spec.ts |  2 +-
 .../client/ui-settings-general/package.json   |  3 ++
 .../src/client/DesktopUpdateIndicator.tsx     |  2 +-
 .../src/client/desktop-update-source.ts       |  2 +-
 .../ui-settings-general/src/client/index.ts   |  2 +-
 .../src/client/shell-contract.ts              |  2 +-
 .../desktop-update-bridge.ts => types.ts}     |  2 +-
 .../tests/components.client.spec.tsx          |  2 +-
 .../tests/desktop-update.client.spec.tsx      |  2 +-
 ...host.client.spec.ts => index.host.spec.ts} |  0
 .../tests/settings-root.client.spec.tsx       |  2 +-
 .../tests/shell.client.spec.ts                |  2 +-
 .../ui-settings-general/tsconfig.client.json  | 28 +++++++++++
 .../ui-settings-general/tsconfig.host.json    | 17 +++++++
 .../client/ui-settings-general/tsconfig.json  | 50 ++-----------------
 pnpm-lock.yaml                                |  3 ++
 tsconfig.base.json                            |  1 +
 tsconfig.client.json                          |  2 +-
 tsconfig.host.json                            |  5 +-
 20 files changed, 69 insertions(+), 61 deletions(-)
 rename packages/client/ui-settings-general/src/{client/desktop-update-bridge.ts => types.ts} (91%)
 rename packages/client/ui-settings-general/tests/{host.client.spec.ts => index.host.spec.ts} (100%)
 create mode 100644 packages/client/ui-settings-general/tsconfig.client.json
 create mode 100644 packages/client/ui-settings-general/tsconfig.host.json

diff --git a/apps/desktop/package.json b/apps/desktop/package.json
index a1cd3af539..e9850c256e 100644
--- a/apps/desktop/package.json
+++ b/apps/desktop/package.json
@@ -41,6 +41,7 @@
   },
   "devDependencies": {
     "@deepseek-ai/dsh-app-boot": "workspace:^",
+    "@deepseek-ai/dsh-client-ui-settings-general": "workspace:^",
     "@deepseek-ai/dsh-client-ui-sidebar-browser": "workspace:^",
     "@deepseek-ai/dsh-home-paths": "workspace:^",
     "@deepseek-ai/node-addon-system": "workspace:^",
diff --git a/apps/desktop/tests/update-presentation.spec.ts b/apps/desktop/tests/update-presentation.spec.ts
index 70ed16a168..9d3ce5009e 100644
--- a/apps/desktop/tests/update-presentation.spec.ts
+++ b/apps/desktop/tests/update-presentation.spec.ts
@@ -2,7 +2,7 @@ import { expect, it } from 'vitest'
 import { desktopUpdateErrorSummary, presentDesktopUpdate } from '../src/update-presentation.ts'
 import { en, zh } from '../src/locale.ts'
 import type { DesktopUpdateState, DshDesktopProductApi } from '../src/ipc.ts'
-import type { DesktopUpdateBridge } from '../../../packages/client/ui-settings-general/src/client/desktop-update-bridge.ts'
+import type { DesktopUpdateBridge } from '@deepseek-ai/dsh-client-ui-settings-general/types'
 
 it('keeps the Electron preload assignable to the product consumer', () => {
   const assign = (bridge: DshDesktopProductApi['updates']): DesktopUpdateBridge => bridge
diff --git a/packages/client/ui-settings-general/package.json b/packages/client/ui-settings-general/package.json
index b0d0e950b6..7e2ce5978b 100644
--- a/packages/client/ui-settings-general/package.json
+++ b/packages/client/ui-settings-general/package.json
@@ -22,6 +22,9 @@
       "types": "./lib/types/client/index.d.ts",
       "default": "./lib/client.js"
     },
+    "./types": {
+      "types": "./lib/types/types.d.ts"
+    },
     "./src/*": "./src/*",
     "./package.json": "./package.json"
   },
diff --git a/packages/client/ui-settings-general/src/client/DesktopUpdateIndicator.tsx b/packages/client/ui-settings-general/src/client/DesktopUpdateIndicator.tsx
index 4ee64a0f34..b4b10350a3 100644
--- a/packages/client/ui-settings-general/src/client/DesktopUpdateIndicator.tsx
+++ b/packages/client/ui-settings-general/src/client/DesktopUpdateIndicator.tsx
@@ -2,7 +2,7 @@
 import { IconDownloadOutlineRegular, IconLoadingOutlineRegular, Tooltip } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { InjectFace, PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import css from './DesktopUpdateIndicator.module.css'
-import type { DesktopUpdateFailureKind, DesktopUpdatePresentation, DesktopUpdateView } from './desktop-update-bridge.ts'
+import type { DesktopUpdateFailureKind, DesktopUpdatePresentation, DesktopUpdateView } from '../types.ts'
 import type { SettingsRootInjected } from './shell-contract.ts'
 
 type SettingsTranslate = PropsLocale<'settings'>['t']
diff --git a/packages/client/ui-settings-general/src/client/desktop-update-source.ts b/packages/client/ui-settings-general/src/client/desktop-update-source.ts
index 7b34bf0efb..9b30244c1c 100644
--- a/packages/client/ui-settings-general/src/client/desktop-update-source.ts
+++ b/packages/client/ui-settings-general/src/client/desktop-update-source.ts
@@ -1,6 +1,6 @@
 /** Client-owned observation of the optional Desktop preload. */
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
-import type { DesktopUpdateBridge, DesktopUpdateView } from './desktop-update-bridge.ts'
+import type { DesktopUpdateBridge, DesktopUpdateView } from '../types.ts'
 
 /** Owns one preload subscription across both sidebar locations. */
 export class DesktopUpdateSource {
diff --git a/packages/client/ui-settings-general/src/client/index.ts b/packages/client/ui-settings-general/src/client/index.ts
index 427229d47c..77c321001d 100644
--- a/packages/client/ui-settings-general/src/client/index.ts
+++ b/packages/client/ui-settings-general/src/client/index.ts
@@ -25,7 +25,7 @@ import type {
 } from './shell-contract.ts'
 import { SettingsRoot } from './SettingsRoot.tsx'
 import { DesktopUpdateBadge } from './DesktopUpdateIndicator.tsx'
-import type { DesktopUpdateBridge } from './desktop-update-bridge.ts'
+import type { DesktopUpdateBridge } from '../types.ts'
 import { DesktopUpdateSource } from './desktop-update-source.ts'
 import { CloseLabel, HeaderContent, TriggerContent } from './chrome.tsx'
 import { GeneralSection } from './GeneralSection.tsx'
diff --git a/packages/client/ui-settings-general/src/client/shell-contract.ts b/packages/client/ui-settings-general/src/client/shell-contract.ts
index bc8497361b..9f2690ac96 100644
--- a/packages/client/ui-settings-general/src/client/shell-contract.ts
+++ b/packages/client/ui-settings-general/src/client/shell-contract.ts
@@ -15,7 +15,7 @@ import type {
 import type {} from '@deepseek-ai/dsh-client-ui-sidebar/client'
 // Type-only: pulls the settings slot declarations the shell renders into.
 import type {} from '@deepseek-ai/dsh-client-ui-settings/client'
-import type { DesktopUpdateView } from './desktop-update-bridge.ts'
+import type { DesktopUpdateView } from '../types.ts'
 
 /** One nav row projected from a settings.section registration's options. */
 export interface SettingsSectionRow {
diff --git a/packages/client/ui-settings-general/src/client/desktop-update-bridge.ts b/packages/client/ui-settings-general/src/types.ts
similarity index 91%
rename from packages/client/ui-settings-general/src/client/desktop-update-bridge.ts
rename to packages/client/ui-settings-general/src/types.ts
index 82eda22079..f9dae34f87 100644
--- a/packages/client/ui-settings-general/src/client/desktop-update-bridge.ts
+++ b/packages/client/ui-settings-general/src/types.ts
@@ -1,4 +1,4 @@
-/** Optional Electron preload declarations consumed by the settings row. */
+/** Type-only Electron update declarations shared by the settings UI and Desktop compatibility checks. */
 
 /** Classified failure copy selected by the Web locale without exposing raw updater diagnostics. */
 export type DesktopUpdateFailureKind =
diff --git a/packages/client/ui-settings-general/tests/components.client.spec.tsx b/packages/client/ui-settings-general/tests/components.client.spec.tsx
index fab06a77e7..e81254d0bc 100644
--- a/packages/client/ui-settings-general/tests/components.client.spec.tsx
+++ b/packages/client/ui-settings-general/tests/components.client.spec.tsx
@@ -25,7 +25,7 @@ function derivedDocumentStore(remote: object) {
 import { en, zh } from '../src/client/locales.ts'
 import { CurrentVersionRow } from '../src/client/CurrentVersionRow.tsx'
 import { DesktopUpdateBadge } from '../src/client/DesktopUpdateIndicator.tsx'
-import type { DesktopUpdateView } from '../src/client/desktop-update-bridge.ts'
+import type { DesktopUpdateView } from '../src/types.ts'
 
 afterEach(() => { cleanup(); vi.unstubAllEnvs() })
 
diff --git a/packages/client/ui-settings-general/tests/desktop-update.client.spec.tsx b/packages/client/ui-settings-general/tests/desktop-update.client.spec.tsx
index 316204370d..b16119a527 100644
--- a/packages/client/ui-settings-general/tests/desktop-update.client.spec.tsx
+++ b/packages/client/ui-settings-general/tests/desktop-update.client.spec.tsx
@@ -4,7 +4,7 @@ import { useSyncExternalStore } from 'react'
 import { afterEach, expect, it, vi } from 'vitest'
 import type { PropsLocale } from '@deepseek-ai/dsh-client-ui-slots'
 import { DesktopUpdateIndicator } from '../src/client/DesktopUpdateIndicator.tsx'
-import type { DesktopUpdateBridge, DesktopUpdatePresentation } from '../src/client/desktop-update-bridge.ts'
+import type { DesktopUpdateBridge, DesktopUpdatePresentation } from '../src/types.ts'
 import { DesktopUpdateSource } from '../src/client/desktop-update-source.ts'
 import { en, zh } from '../src/client/locales.ts'
 
diff --git a/packages/client/ui-settings-general/tests/host.client.spec.ts b/packages/client/ui-settings-general/tests/index.host.spec.ts
similarity index 100%
rename from packages/client/ui-settings-general/tests/host.client.spec.ts
rename to packages/client/ui-settings-general/tests/index.host.spec.ts
diff --git a/packages/client/ui-settings-general/tests/settings-root.client.spec.tsx b/packages/client/ui-settings-general/tests/settings-root.client.spec.tsx
index 74a5b22cfb..db8d5ac1f6 100644
--- a/packages/client/ui-settings-general/tests/settings-root.client.spec.tsx
+++ b/packages/client/ui-settings-general/tests/settings-root.client.spec.tsx
@@ -9,7 +9,7 @@ import { SessionId } from '@deepseek-ai/dsh-session/types'
 import type { SettingsRootComponentProps } from '../src/client/shell-contract.ts'
 import { SettingsRoot } from '../src/client/SettingsRoot.tsx'
 import { en, zh } from '../src/client/locales.ts'
-import type { DesktopUpdateView } from '../src/client/desktop-update-bridge.ts'
+import type { DesktopUpdateView } from '../src/types.ts'
 
 // Every fixture carries the resource hook the resources plugin merges into GlobalStandardProps.
 const useResource = (() => ({ status: 'none' as const, value: undefined, failure: undefined, reload: () => {} })) as GlobalStandardProps['useResource']
diff --git a/packages/client/ui-settings-general/tests/shell.client.spec.ts b/packages/client/ui-settings-general/tests/shell.client.spec.ts
index f0ed057d43..2f4c9a6714 100644
--- a/packages/client/ui-settings-general/tests/shell.client.spec.ts
+++ b/packages/client/ui-settings-general/tests/shell.client.spec.ts
@@ -11,7 +11,7 @@ import { createClientTest, type TestClient, webApp } from '@deepseek-ai/dsh-clie
 import { inject } from '../src/client/index.ts'
 import type { SettingsRootInjected } from '../src/client/shell-contract.ts'
 import { SettingsRoot } from '../src/client/SettingsRoot.tsx'
-import type { DesktopUpdatePresentation } from '../src/client/desktop-update-bridge.ts'
+import type { DesktopUpdatePresentation } from '../src/types.ts'
 
 const SELF = '@deepseek-ai/dsh-client-ui-settings-general'
 const SIDEBAR = '@deepseek-ai/dsh-client-ui-sidebar'
diff --git a/packages/client/ui-settings-general/tsconfig.client.json b/packages/client/ui-settings-general/tsconfig.client.json
new file mode 100644
index 0000000000..aa580faf19
--- /dev/null
+++ b/packages/client/ui-settings-general/tsconfig.client.json
@@ -0,0 +1,28 @@
+{
+  "extends": "../../../tsconfig.base.client.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types",
+    "tsBuildInfoFile": "lib/tsconfig.client.tsbuildinfo"
+  },
+  "include": [
+    "src/client",
+    "src/types.ts",
+    "src/css-modules.d.ts"
+  ],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../../vendor/schemastery" },
+    { "path": "../ui-slots" },
+    { "path": "../ui-primitives" },
+    { "path": "../ui-renderer" },
+    { "path": "../ui-session" },
+    { "path": "../store" },
+    { "path": "../ui-settings" },
+    { "path": "../locale" },
+    { "path": "../connection/tsconfig.client.json" },
+    { "path": "../../settings/settings" },
+    { "path": "../../api/remotes/tsconfig.client.json" },
+    { "path": "../ui-sidebar" }
+  ]
+}
diff --git a/packages/client/ui-settings-general/tsconfig.host.json b/packages/client/ui-settings-general/tsconfig.host.json
new file mode 100644
index 0000000000..466d8deab2
--- /dev/null
+++ b/packages/client/ui-settings-general/tsconfig.host.json
@@ -0,0 +1,17 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types",
+    "tsBuildInfoFile": "lib/tsconfig.host.tsbuildinfo"
+  },
+  "files": [
+    "src/index.ts",
+    "src/types.ts"
+  ],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../../vendor/schemastery" },
+    { "path": "../../settings/settings" }
+  ]
+}
diff --git a/packages/client/ui-settings-general/tsconfig.json b/packages/client/ui-settings-general/tsconfig.json
index a0984445cd..2a0b0e33f7 100644
--- a/packages/client/ui-settings-general/tsconfig.json
+++ b/packages/client/ui-settings-general/tsconfig.json
@@ -1,51 +1,7 @@
 {
-  "extends": "../../../tsconfig.base.client.json",
-  "compilerOptions": {
-    "rootDir": "src",
-    "outDir": "lib/types"
-  },
-  "include": [
-    "src"
-  ],
+  "files": [],
   "references": [
-    {
-      "path": "../../../vendor/cordis"
-    },
-    {
-      "path": "../../../vendor/schemastery"
-    },
-    {
-      "path": "../ui-slots"
-    },
-    {
-      "path": "../ui-primitives"
-    },
-    {
-      "path": "../ui-renderer"
-    },
-    {
-      "path": "../ui-session"
-    },
-    {
-      "path": "../store"
-    },
-    {
-      "path": "../ui-settings"
-    },
-    {
-      "path": "../locale"
-    },
-    {
-      "path": "../connection/tsconfig.client.json"
-    },
-    {
-      "path": "../../settings/settings"
-    },
-    {
-      "path": "../../api/remotes/tsconfig.client.json"
-    },
-    {
-      "path": "../ui-sidebar"
-    }
+    { "path": "./tsconfig.host.json" },
+    { "path": "./tsconfig.client.json" }
   ]
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 407a83ed4d..0c1c28fb6d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -557,6 +557,9 @@ importers:
       '@deepseek-ai/dsh-app-boot':
         specifier: workspace:^
         version: link:../../packages/boot/app-boot
+      '@deepseek-ai/dsh-client-ui-settings-general':
+        specifier: workspace:^
+        version: link:../../packages/client/ui-settings-general
       '@deepseek-ai/dsh-client-ui-sidebar-browser':
         specifier: workspace:^
         version: link:../../packages/client/ui-sidebar-browser
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 7df1d33301..b0752e0f36 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -255,6 +255,7 @@
       "@deepseek-ai/dsh-client-ui-theme": ["./packages/client/ui-theme/src"],
       "@deepseek-ai/dsh-client-ui-settings": ["./packages/client/ui-settings/src"],
       "@deepseek-ai/dsh-client-ui-settings-general": ["./packages/client/ui-settings-general/src"],
+      "@deepseek-ai/dsh-client-ui-settings-general/types": ["./packages/client/ui-settings-general/src/types.ts"],
       "@deepseek-ai/dsh-client-ui-settings-models": ["./packages/client/ui-settings-models/src"],
       "@deepseek-ai/dsh-client-ui-plugin-manager": ["./packages/client/ui-plugin-manager/src"],
       "@deepseek-ai/dsh-client-ui-settings-plugin-inventory": ["./packages/client/ui-settings-plugin-inventory/src"],
diff --git a/tsconfig.client.json b/tsconfig.client.json
index a6ffd07d29..d6b4de5dc2 100644
--- a/tsconfig.client.json
+++ b/tsconfig.client.json
@@ -110,7 +110,7 @@
     { "path": "./packages/client/ui-open-in-app" },
     { "path": "./packages/client/ui-theme" },
     { "path": "./packages/client/ui-settings" },
-    { "path": "./packages/client/ui-settings-general" },
+    { "path": "./packages/client/ui-settings-general/tsconfig.client.json" },
     { "path": "./packages/client/ui-settings-models" },
     { "path": "./packages/client/ui-plugin-manager" },
     { "path": "./packages/client/ui-settings-plugin-inventory" },
diff --git a/tsconfig.host.json b/tsconfig.host.json
index deeb1d8f26..dc13be5338 100644
--- a/tsconfig.host.json
+++ b/tsconfig.host.json
@@ -7,9 +7,7 @@
     "noEmit": true,
     "rewriteRelativeImportExtensions": false
   },
-  "files": [
-    "packages/client/ui-settings-general/src/client/desktop-update-bridge.ts"
-  ],
+  "files": [],
   "include": [
     "apps/web/product-isolation.ts",
     "apps/web/tests/default-product-isolation.e2e.ts",
@@ -184,6 +182,7 @@
     { "path": "./packages/experimental/computer-use-cua-driver-native" },
     { "path": "./packages/client/ui-sidebar-documentpreview/tsconfig.host.json" },
     { "path": "./packages/client/ui-sidebar-browser/tsconfig.host.json" },
+    { "path": "./packages/client/ui-settings-general/tsconfig.host.json" },
     { "path": "./packages/document/office-to-pdf" },
     { "path": "./packages/client/ui-deliverables/tsconfig.host.json" },
     { "path": "./vendor/cosmokit" },

From 5614184902b1f875ca4260b6dc3193004794d7aa Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 01:50:16 +0800
Subject: [PATCH 52/62] chore(browser): prune retired unknown-cast baseline

---
 scripts/no-unknown-casts.baseline.json | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/scripts/no-unknown-casts.baseline.json b/scripts/no-unknown-casts.baseline.json
index 56acc44135..165227e582 100644
--- a/scripts/no-unknown-casts.baseline.json
+++ b/scripts/no-unknown-casts.baseline.json
@@ -728,9 +728,6 @@
     "14a0dc9ccde2879c016f779e0e43f3aa71792759126530b418c9a31a5a2e7a53": 1,
     "ad8886dedfafd8e5f4bf7cb55525bb961822ad0c4fb0ff4a643bfb336fb9d94b": 1
   },
-  "packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx": {
-    "dac38a9cc792ab6f3a345802975995e35a48d5a706c26d67cb7dba1c906ee3d5": 1
-  },
   "packages/client/ui-sidebar-documentpreview/tests/document-toolbar.client.spec.tsx": {
     "fb9804cc2774409af6935d5a1369497b433c34cd9305cac88e3400eae0f70936": 1
   },

From e9a0d5ac7718bb1a921ddd7f5133bdf0110467ff Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 02:17:37 +0800
Subject: [PATCH 53/62] fix(desktop): address sidebar retention and webview
 review findings

---
 ...9-20-sidebar-retained-tab-layout.i18n.yaml |  4 +-
 .../2026-09-20-sidebar-retained-tab-layout.md |  4 +-
 ...26-09-20-sidebar-retained-tab-layout.zh.md |  4 +-
 ...26-09-20-desktop-browser-webview.i18n.yaml |  4 +-
 .../2026-09-20-desktop-browser-webview.md     |  2 +-
 .../2026-09-20-desktop-browser-webview.zh.md  |  2 +-
 apps/desktop/README.i18n.yaml                 |  4 +-
 apps/desktop/README.md                        |  4 +-
 apps/desktop/README.zh.md                     |  4 +-
 apps/desktop/src/preload-app.ts               | 26 +++++-----
 apps/desktop/tests/preload-app.spec.ts        |  3 +-
 apps/web/tests/sidebar-right.e2e.ts           |  4 +-
 docs/subsystems/sidebar-right.i18n.yaml       |  4 +-
 docs/subsystems/sidebar-right.md              |  5 +-
 docs/subsystems/sidebar-right.zh.md           |  5 +-
 packages/client/ui-dockkit/README.i18n.yaml   |  4 +-
 packages/client/ui-dockkit/README.md          |  6 ++-
 packages/client/ui-dockkit/README.zh.md       |  6 ++-
 .../ui-sidebar-browser/README.i18n.yaml       |  4 +-
 packages/client/ui-sidebar-browser/README.md  | 19 +++----
 .../client/ui-sidebar-browser/README.zh.md    | 19 +++----
 .../src/client/browser/ElectronWebViewImpl.ts |  5 ++
 .../tests/browser-body.client.spec.tsx        |  3 +-
 .../tests/electron-frame.client.spec.ts       | 51 +++++++++++++++++++
 .../client/ui-sidebar-right/README.i18n.yaml  |  4 +-
 packages/client/ui-sidebar-right/README.md    | 15 +++---
 packages/client/ui-sidebar-right/README.zh.md | 15 +++---
 .../src/client/contract/slots.ts              |  8 ++-
 .../ui-sidebar-right/src/client/index.ts      |  3 +-
 .../src/client/persistence.ts                 |  3 +-
 .../src/client/session-view.ts                |  7 +--
 .../src/client/session-views.ts               | 21 ++------
 .../src/client/shell/RightbarRoot.tsx         |  2 +-
 .../src/client/shell/SidebarRight.tsx         |  6 +--
 .../tests/apply.client.spec.ts                |  3 ++
 .../persistence-validation.client.spec.ts     | 10 ++++
 .../tests/seat.client.spec.tsx                | 38 +++++++++++---
 37 files changed, 217 insertions(+), 114 deletions(-)
 create mode 100644 packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts

diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
index d901a7b963..1c6d9a342c 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
-2026-09-20-sidebar-retained-tab-layout.md: 7430c0f20c5e7161658f8d55e2b597ecfca91d8c
-2026-09-20-sidebar-retained-tab-layout.zh.md: a6efd26b52ec8a1b671369b5f70ddb677358adca
+2026-09-20-sidebar-retained-tab-layout.md: edcbea073bed976ac30dc75a992f3c41031766d2
+2026-09-20-sidebar-retained-tab-layout.zh.md: 98fc38f605e61e39b715d854bb815a8bfba90abc
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
index 7430c0f20c..edcbea073b 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
@@ -28,7 +28,7 @@ Sidebar owns live-body retention, independently of Browser navigation and Worksp
 
 `SidebarSessionView` acquires and releases one `SessionReference` using the independent `sidebarView` source, and owns its committed-mount count and retained-Body holds. `SidebarSessionViews` manages selection, retention policy and view indexes; it delegates lifetime operations to the view rather than mutating its counts or releasing its reference. `RightbarRoot` receives `SidebarSessionViewSnapshot` values and the existing injected callbacks, not resource-owner objects. It renders each through its own explicit `SessionProvider`, with a stable Session key; the renderer's general Session-remount semantics remain unchanged.
 
-Tabs contribute Body-retention holds rather than independent Session references. Those holds follow the existing occurrence signal, including a new signal after close-and-undo; the view does not create a second tab lifetime. A retired view stays in the collection's reference index until its own disposal removes it, so plugin shutdown can also reach views whose React mounts have not finished.
+Tabs contribute Body-retention holds rather than independent Session references. The View's stable `retainTab` callback reaches its seat through owner props, so replacing Session injection bindings does not release and reacquire those holds. Those holds follow the existing occurrence signal, including a new signal after close-and-undo; the view does not create a second tab lifetime. A retired view stays in the collection's reference index until its own disposal removes it, so plugin shutdown can also reach views whose React mounts have not finished.
 
 Only the selected Session reports frame occupancy or binds public Sidebar navigation. Background tab actions still address their own adopted store. `tab.visible` includes Session and global-panel visibility; floating does not make a background Session visible. A Session change or global panel hides its whole content tree, while Sidebar collapse hides only docked cells and leaves foreground floats visible. Hidden content is inaccessible to pointer and keyboard input, and hidden body focus is blurred.
 
@@ -81,4 +81,4 @@ The change affects Sidebar chrome, float stacking, focus and platform styles, no
 
 ## Verification
 
-Focused TypeScript compilation covers Sidebar, Browser and Desktop source. DockKit, Sidebar, Browser and Desktop bundles and the Web shell build complete. No tests or recordings were added or run, and the running Electron was not restarted. The stable-tree implementation still requires real Electron verification of guest identity, form and history retention, multi-float paint order, resizing, clipping, drop hints, focus and platform window controls. Compilation and bundling are not evidence that these runtime observations pass.
+Focused tests cover retained bodies across Session-source registration and removal, persisted-layout validation, and existing Sidebar presentation. Host and Client TypeScript compilation passes. The user manually accepted a rebuilt Electron cold start; no GIF was recorded. Dedicated real-Electron evidence for guest identity, form and history retention, multi-float paint order, resizing, clipping, drop hints, focus and platform window controls remains separate from these unit tests.
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
index a6efd26b52..98fc38f605 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
@@ -28,7 +28,7 @@ Sidebar 负责活 Body 的保留，不依赖 Browser 导航和 Workspace 存储
 
 `SidebarSessionView` 使用独立的 `sidebarView` 来源申请、释放一个 `SessionReference`，并管理自己的已提交挂载计数和 Body 保活持有。`SidebarSessionViews` 管理选中、保留策略和视图索引，将生命周期操作委托给视图，而不修改其计数或释放其引用。`RightbarRoot` 接收 `SidebarSessionViewSnapshot` 和已有注入回调，不接收资源所有者对象；它为各视图分别渲染显式 `SessionProvider`，保持会话 key 稳定，渲染器通用的会话重挂载语义不变。
 
-Tab 提供 Body 保活持有，而不独立申请会话引用。这些持有跟随已有 occurrence signal，包括关闭后撤销恢复得到的新 signal；视图不创建第二套 Tab 生命周期。退出视图列表的视图仍留在集合的引用索引中，直到自行释放时移除索引，因此插件关闭时也能清理尚未结束 React 挂载的视图。
+Tab 提供 Body 保活持有，而不独立申请会话引用。View 的稳定 `retainTab` 回调通过 owner props 传给席位，因此替换 Session injection binding 不会释放再重新获取这些持有。这些持有跟随已有 occurrence signal，包括关闭后撤销恢复得到的新 signal；视图不创建第二套 Tab 生命周期。退出视图列表的视图仍留在集合的引用索引中，直到自行释放时移除索引，因此插件关闭时也能清理尚未结束 React 挂载的视图。
 
 只有选中的会话向 frame 报告占位、绑定公共 Sidebar 导航。后台 Tab actions 仍指向自己的已接管存储。`tab.visible` 包含会话和全局面板的可见性，浮动不会让后台会话变成可见。切会话或打开全局面板隐藏整个内容树，收起 Sidebar 则只隐藏停靠 cell，前台浮窗仍可见。隐藏内容不可通过指针或键盘访问，隐藏 Body 内的焦点会被移除。
 
@@ -81,4 +81,4 @@ Tab 提供 Body 保活持有，而不独立申请会话引用。这些持有跟
 
 ## Verification
 
-定向 TypeScript 编译覆盖 Sidebar、Browser 和 Desktop 源码，DockKit、Sidebar、Browser、Desktop 打包及 Web 外壳构建完成。未添加或运行测试、未录制演示，也未重启正在运行的 Electron。稳定树实现仍需真实 Electron 验证 guest 身份、表单与 history 保留、多浮窗绘制顺序、缩放、裁剪、放置提示、焦点和平台窗口控件。编译与打包不代表这些运行时观察已通过。
+定向测试覆盖 Session 数据源注册与注销期间的正文保活、存档布局校验和既有 Sidebar 呈现。Host 与 Client TypeScript 编译通过。用户已手动验收重新构建后的 Electron 冷启动；未录制 GIF。guest 身份、表单与 history 保留、多浮窗绘制顺序、缩放、裁剪、放置提示、焦点和平台窗口控件仍需独立于这些单元测试的真实 Electron 证据。
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
index 8152bfbd4c..7f4c2e3dfc 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
-2026-09-20-desktop-browser-webview.md: 2b2b86ba08a7c10321834c2f78d6fe77cdcda7e4
-2026-09-20-desktop-browser-webview.zh.md: 3e0ed130c58fe197804a2cb835d82446f7e21f5c
+2026-09-20-desktop-browser-webview.md: 586cfb378b05d4d1083b810c321f153e5cb93646
+2026-09-20-desktop-browser-webview.zh.md: 8522df6301707ed80c2f75ccda22c63f4e8f2491
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
index 2b2b86ba08..586cfb378b 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -54,4 +54,4 @@ The Desktop toolbar has no sandbox-disable switch. The implementation adds no re
 
 Sidebar-owned stable ancestors preserve the page without Browser-owned geometry or occlusion handling. Hidden guests retain page memory and may continue network activity; there is no idle eviction policy. Persistent storage, selectable isolation scopes and permission-grant UI remain separate work. Temporary Workspace partitions are the current policy, not a promise that Workspace isolation always implies temporary storage.
 
-No tests or GUI recordings accompany this change. Compilation does not establish real Electron attachment timing, overlap, focus, platform styling or storage isolation; those remain runtime verification gaps. The unchanged iframe scenarios do not cover the native carrier. This implementation is not evidence that the complete browser security policy is ready for release.
+Focused tests cover native navigation error recovery, preload listener scoping and migrated iframe behavior. They do not establish real Electron attachment timing, overlap, focus, platform styling or storage isolation; those remain runtime verification gaps. No GUI recording accompanies the change. This implementation is not evidence that the complete browser security policy is ready for release.
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
index 3e0ed130c5..8522df6301 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -54,4 +54,4 @@ Desktop toolbar 没有关闭 sandbox 的开关。实现不增加远程调试端
 
 Sidebar 持有的稳定祖先保留页面，无需 Browser 自行处理几何或遮挡。隐藏 guest 保留页面内存，也可能继续联网；当前没有空闲回收策略。持久化存储、可选择的隔离级别与权限授权 UI 留作独立工作。临时 Workspace partition 是当前策略，并不意味着 Workspace 隔离必然要求临时存储。
 
-本次变更不附带测试或 GUI 录像。编译不能确认真实 Electron 的挂载时序、遮挡、焦点、平台样式或存储隔离；这些仍是运行时验证缺口。未修改的 iframe 场景不覆盖原生载体。此实现不构成完整浏览器安全策略已经可以发布的证据。
+定向测试覆盖原生导航错误恢复、preload 监听范围和已迁移的 iframe 行为。这些测试不能确认真实 Electron 的挂载时序、遮挡、焦点、平台样式或存储隔离；这些仍是运行时验证缺口。本次变更不附带 GUI 录像。此实现不构成完整浏览器安全策略已经可以发布的证据。
diff --git a/apps/desktop/README.i18n.yaml b/apps/desktop/README.i18n.yaml
index b536269a93..99c0581bbc 100644
--- a/apps/desktop/README.i18n.yaml
+++ b/apps/desktop/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write apps/desktop/README.md
-README.md: 48ad6bbcf515aac5734da1fd406ce70f0f4d6505
-README.zh.md: 795e62a0e119e40211387a12f9e4fa56fdde3e79
+README.md: dff2a98591b763d28b0e2d35430f8120d92f0afd
+README.zh.md: 7e98bb6c2fb390f9984887b64b3a01c0a89530dc
diff --git a/apps/desktop/README.md b/apps/desktop/README.md
index 48ad6bbcf5..dff2a98591 100644
--- a/apps/desktop/README.md
+++ b/apps/desktop/README.md
@@ -46,7 +46,9 @@ The [thin-wrapper decision](../../.agents/notes/implemented/architecture/2026-09
 
 Electron owns `$DSH_HOME/profiles/desktop`. Its `dependencies` contains packages installed by pnpm; `dsh.profile.bundles` contains the built-in bundles followed by enabled plugins. The signed application supplies dsh, the private Desktop Host, and their production packages from `resources/app.asar/dsh`. Packaged applications select runtime profile resolution without creating package links; development profiles use filesystem links. Both host and plugins execute in the same Electron Node-mode process; Desktop does not enable `--preserve-symlinks`. The CLI cannot boot or mutate this profile.
 
-The application preload exposes boot readiness, fatal startup reporting, and native directory selection. Product documents use the shared authenticated HTTP APIs and receive the Desktop marker, update presentation, and an action that opens native confirmation; they cannot choose artifacts or authorize installation. Plugin management uses the Web application's authenticated HTTP APIs. Electron serves update-dialog documents and assets locally at `dsh-app://shell/`, independently of Host readiness. Electron exposes no plugin-management IPC or separate management document. No renderer receives filesystem access, raw Electron IPC, a shell, or arbitrary pnpm arguments.
+The application preload exposes boot readiness, fatal startup reporting, native directory selection, and the lease-scoped Browser bridge only to `dsh-app://app` documents. Product documents use the shared authenticated HTTP APIs and receive the Desktop marker, update presentation, and an action that opens native confirmation; they cannot choose artifacts or authorize installation. Plugin management uses the Web application's authenticated HTTP APIs. Electron serves update-dialog documents and assets locally at `dsh-app://shell/`, independently of Host readiness. Electron exposes no plugin-management IPC or separate management document. No renderer receives filesystem access, raw Electron IPC, a shell, or arbitrary pnpm arguments.
+
+Only the main application window enables `<webview>`. Guest attachment must match a main-issued lease and partition; guests keep sandbox, context isolation and Web security without Node integration or guest preload. Browser IPC listeners are created only for the application document. [Sidebar Browser](../../packages/client/ui-sidebar-browser/README.md) describes storage grouping and guest limitations; Host authentication remains required independently of URL filtering.
 
 The `dsh-app://shell/` origin serves packaged update documents, scripts, and styles without contacting the Host. Static requests retain GET/HEAD, path-containment, and MIME handling; each update document keeps its isolated preload and owned-window IPC checks.
 
diff --git a/apps/desktop/README.zh.md b/apps/desktop/README.zh.md
index 795e62a0e1..7e98bb6c2f 100644
--- a/apps/desktop/README.zh.md
+++ b/apps/desktop/README.zh.md
@@ -46,7 +46,9 @@ Node 准备内置解释器和 Python 库，无需系统 Python 或 pip。[下载
 
 Electron 拥有 `$DSH_HOME/profiles/desktop`。其 `dependencies` 包含 pnpm 安装的包；`dsh.profile.bundles` 包含内置 bundle，后接已启用插件。签名应用从 `resources/app.asar/dsh` 提供 dsh、私有 Desktop Host 及其生产依赖。打包应用选择 runtime profile 解析，不创建包链接；开发 profile 使用文件系统链接。宿主与插件在同一个 Electron Node 模式进程中执行；Desktop 不启用 `--preserve-symlinks`。CLI 不能启动或修改此 profile。
 
-应用 preload 暴露启动就绪、致命启动失败上报和原生目录选择。产品页面还获得 Desktop 标记、更新展示数据和打开原生确认的操作，不能选择安装产物或授权安装。插件管理使用 Web 应用经过认证的 HTTP API；Electron 在 `dsh-app://shell/` 本地提供更新弹窗文档和资源，不依赖 Host 就绪。Electron 不提供插件管理 IPC 或独立管理页面。
+应用 preload 只向 `dsh-app://app` 文档暴露启动就绪、致命启动失败上报、原生目录选择和租约范围内的 Browser 桥接。产品页面还获得 Desktop 标记、更新展示数据和打开原生确认的操作，不能选择安装产物或授权安装。插件管理使用 Web 应用经过认证的 HTTP API；Electron 在 `dsh-app://shell/` 本地提供更新弹窗文档和资源，不依赖 Host 就绪。Electron 不提供插件管理 IPC 或独立管理页面。
+
+只有主应用窗口启用 `<webview>`。guest 挂载必须匹配主进程签发的租约和分区；guest 保持 sandbox、context isolation 和 Web security，不启用 Node integration 或 guest preload。Browser IPC 监听只为应用文档创建。[Sidebar Browser](../../packages/client/ui-sidebar-browser/README.zh.md) 说明存储分组和 guest 限制；Host 鉴权仍独立于 URL 过滤而必需。
 
 `dsh-app://shell/` 无需联系 Host 即可提供打包的更新文档、脚本和样式。静态请求保留 GET/HEAD、路径范围和 MIME 处理；每个更新文档继续使用隔离 preload 和所属窗口的 IPC 校验。
 
diff --git a/apps/desktop/src/preload-app.ts b/apps/desktop/src/preload-app.ts
index 9757994ef5..7d880a857c 100644
--- a/apps/desktop/src/preload-app.ts
+++ b/apps/desktop/src/preload-app.ts
@@ -8,18 +8,20 @@ import { syncWindowsAppearance } from './preload-windows.ts'
 import { installMandatoryUpdateOverlay } from './preload-mandatory-overlay.ts'
 import { createDesktopBrowserBridge } from './preload-browser.ts'
 
-const product: DshDesktopProductApi = {
-  protocolVersion: 1,
-  browser: createDesktopBrowserBridge(),
-  updates: {
-    status: () => ipcRenderer.invoke(DESKTOP_IPC.updatesStatus) as Promise<DesktopUpdatePresentation>,
-    open: () => ipcRenderer.invoke(DESKTOP_IPC.updatesOpen) as Promise<void>,
-    subscribe(listener) {
-      const handle = (_event: Electron.IpcRendererEvent, state: DesktopUpdatePresentation): void => { listener(state) }
-      ipcRenderer.on(DESKTOP_IPC.updatesPresentation, handle)
-      return () => { ipcRenderer.off(DESKTOP_IPC.updatesPresentation, handle) }
+function createProductApi(): DshDesktopProductApi {
+  return {
+    protocolVersion: 1,
+    browser: createDesktopBrowserBridge(),
+    updates: {
+      status: () => ipcRenderer.invoke(DESKTOP_IPC.updatesStatus) as Promise<DesktopUpdatePresentation>,
+      open: () => ipcRenderer.invoke(DESKTOP_IPC.updatesOpen) as Promise<void>,
+      subscribe(listener) {
+        const handle = (_event: Electron.IpcRendererEvent, state: DesktopUpdatePresentation): void => { listener(state) }
+        ipcRenderer.on(DESKTOP_IPC.updatesPresentation, handle)
+        return () => { ipcRenderer.off(DESKTOP_IPC.updatesPresentation, handle) }
+      },
     },
-  },
+  }
 }
 
 if (location.protocol === `${SCHEME}:` && location.hostname === 'app') {
@@ -38,4 +40,4 @@ markDocumentPlatform()
 syncWindowFullscreen()
 syncNativeTheme()
 // Main-process IPC also verifies the owning window and top frame.
-contextBridge.exposeInMainWorld('dshDesktop', location.protocol === `${SCHEME}:` && location.hostname === 'app' ? product : { protocolVersion: 1 })
+contextBridge.exposeInMainWorld('dshDesktop', location.protocol === `${SCHEME}:` && location.hostname === 'app' ? createProductApi() : { protocolVersion: 1 })
diff --git a/apps/desktop/tests/preload-app.spec.ts b/apps/desktop/tests/preload-app.spec.ts
index fb633e8a4a..6e1740fc61 100644
--- a/apps/desktop/tests/preload-app.spec.ts
+++ b/apps/desktop/tests/preload-app.spec.ts
@@ -27,7 +27,7 @@ it('limits product documents to update status and a native confirmation action',
   expect(api.updates).not.toHaveProperty('install')
   const listener = vi.fn()
   const dispose = api.updates.subscribe(listener)
-  const handler = electron.ipcRenderer.on.mock.calls[0]?.[1] as (event: unknown, state: unknown) => void
+  const handler = electron.ipcRenderer.on.mock.calls.find(([channel]) => channel === DESKTOP_IPC.updatesPresentation)?.[1] as (event: unknown, state: unknown) => void
   handler({}, { visible: false })
   expect(listener).toHaveBeenCalledWith({ visible: false })
   dispose()
@@ -38,6 +38,7 @@ it.each(['dsh-app://shell/plugin-manager.html', 'dsh-app://other/index.html', 'h
   vi.stubGlobal('location', new URL(url))
   await import('../src/preload-app.ts')
   expect(electron.contextBridge.exposeInMainWorld).toHaveBeenCalledWith('dshDesktop', { protocolVersion: 1 })
+  expect(electron.ipcRenderer.on.mock.calls.some(([channel]) => channel === DESKTOP_IPC.browserOpenRequested)).toBe(false)
 })
 
 it('exposes asynchronous boot only to the local application document', async () => {
diff --git a/apps/web/tests/sidebar-right.e2e.ts b/apps/web/tests/sidebar-right.e2e.ts
index 90571db3f4..9b19dcbdde 100644
--- a/apps/web/tests/sidebar-right.e2e.ts
+++ b/apps/web/tests/sidebar-right.e2e.ts
@@ -719,7 +719,7 @@ describe('web e2e: shipped right Sidebar', () => {
       onTestFailed(() => saveFailureShot(page, 'web-e2e-sidebar-right-content'))
       const column = page.locator('[data-rightbar-col]')
       const panes = column.locator('[data-dockkit-pane]')
-      const floats = page.locator('[data-sidebar-right-float-host] [data-dockkit-float]')
+      const floats = page.locator('[data-sidebar-right-session]:not([hidden]) [data-dockkit-float]')
 
       // Observation before action: does the read ever leave the browser? The
       // assertion states the healthy answer so a failure prints the real one.
@@ -891,7 +891,7 @@ describe('web e2e: shipped right Sidebar', () => {
       onTestFailed(() => saveFailureShot(page, 'web-e2e-sidebar-right-gestures'))
       const column = await resetSidebar(page)
       const panes = column.locator('[data-dockkit-pane]')
-      const floats = page.locator('[data-sidebar-right-float-host] [data-dockkit-float]')
+      const floats = page.locator('[data-sidebar-right-session]:not([hidden]) [data-dockkit-float]')
 
       // Chromium cancels pointer capture if a render replaces the pressed
       // element; jsdom cannot establish that the whole gesture survives.
diff --git a/docs/subsystems/sidebar-right.i18n.yaml b/docs/subsystems/sidebar-right.i18n.yaml
index 30b50d6a0a..091c70c940 100644
--- a/docs/subsystems/sidebar-right.i18n.yaml
+++ b/docs/subsystems/sidebar-right.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/subsystems/sidebar-right.md
-sidebar-right.md: 27e5219aec8997cf0d168ac9ea2665baaf943906
-sidebar-right.zh.md: 63f2c1081009778e191789038ffd1923312fc55b
+sidebar-right.md: e3a4ffcf4e4b17975c10c0358f6f53dc5eea6ec2
+sidebar-right.zh.md: a588dc99b92314c54ea1309e4a44d305e23b970f
diff --git a/docs/subsystems/sidebar-right.md b/docs/subsystems/sidebar-right.md
index 27e5219aec..e3a4ffcf4e 100644
--- a/docs/subsystems/sidebar-right.md
+++ b/docs/subsystems/sidebar-right.md
@@ -8,7 +8,7 @@ This page is the reference for the subsystem's contracts: addresses, tab-type re
 
 ## Position and ownership
 
-One docking surface exists per Session, held in a session-scoped slot store and drawn by `rightbar.session`. The root-scoped `rightbar` controller mounts that seat only while Conversation is selected; a reload returns every session to the collapsed default, and switching sessions keeps each surface where it was ([state](../../packages/client/ui-sidebar-right/README.md#state)). The surface's every change is one recorded history entry computed by the kit's pure planners; a docked pane never stays empty, and an empty root pane receives the default page selected from registered guide entries.
+One docking surface exists per Session, held in a session-scoped slot store and drawn by `rightbar.session`. The root-scoped `rightbar` controller retains separate seats for the selected Session and background Sessions with initialized `keepMounted` bodies; only the foreground Conversation is visible. Reload restores saved layouts ([state](../../packages/client/ui-sidebar-right/README.md#state)). The surface's every change is one recorded history entry computed by the kit's pure planners; a docked pane never stays empty, and an empty root pane receives the default page selected from registered guide entries.
 
 A tab type is two registrations that share the definition's `id`: a static definition in `ctx.sidebarRightTabs` saying which addresses its `kind` opens, and a keyed slot registration supplying its body. The framework injects `useTabInfo()` for live Sidebar, pane and tab information; each type keeps its own state in its slot store. Packages import each other's declarations only as types.
 
@@ -43,6 +43,7 @@ Tab identity is the pair `(kind, address)`: the registry's claim uses the addres
 | `priority` | One of three literal bands: `extension` (the default and the highest: a type from outside the product outranks every shipped viewer), `builtin` (types shipped with the product), `fallback` (plain-content viewers anything more specific should beat). |
 | `canOpen(address)` | Optional synchronous veto of a glob match; it runs on every routing decision. |
 | `title(address)` | The chip's text, captured into the layout record when the tab opens and never rewritten. |
+| `keepMounted` | Optional lazy retention of visited bodies across hiding, Session switches and docking; the owning View holds the Session reference. |
 | `guide` | Optional entry boxes for the guide page: `{ order, title(), description?(), icon? }`. Picking a box opens the contributing type as a page; omit to stay off the page. |
 
 Routing is a ranked claim. `candidates(address)` ranks the types whose patterns match and whose `canOpen` does not veto: by band, then by the length of the longest matched pattern, then by registration order. `claim(address, kind?)` picks the first candidate, or the named `kind` outright — its globs are skipped, its `canOpen` still applies — and returns `{ kind, contentId: address, title }`. An address no type claims throws: it is a wiring mistake, not a user error.
@@ -101,7 +102,7 @@ The Sidebar declares four extension slots; its document tab declares the additio
 | `sidebar.right.tab.menu.item` | list, Session scope | Content-level actions appended after the kit's own layout actions. An item that acts must call the owner's `dismiss()`. |
 | `sidebar.right.tab.document` | keyed by the document implementation's `id`, Session scope | The selected file renderer inside the document tab; the parent owns shared loading and toolbar controls. |
 
-A body, title and guide replacement receive the framework-injected `useTabInfo()`. It returns `{ sidebar, panel, tab }`: `sidebar` holds `expanded` and `fullscreen`, `panel.id` names the containing pane, and `tab` contains its record fields plus `visible`, `navigation`, `signal`, and `actions`. Docked bodies are visible only while expanded and active; docked titles need only expansion; floats stay visible. `signal` aborts when the record disappears or the plugin unloads, not on hiding or Session switching. `tab.actions` provides `openResource`, `openTab`, and `close`, bound to the tab's own Session. Open placement defaults to its current pane; `revealIfOpened` defaults to `true`, and `replaceTab: true` replaces this record in the same history entry. Menu entries retain plain `tab` and `dismiss` owner parameters.
+A body, title and guide replacement receive the framework-injected `useTabInfo()`. It returns `{ sidebar, panel, tab }`: `sidebar` holds `expanded` and `fullscreen`, `panel.id` names the containing pane, and `tab` contains its record fields plus `visible`, `navigation`, `signal`, and `actions`. All tabs require a foreground Session. Docked bodies also require expansion and selection; docked titles require expansion; foreground floats survive collapse. `signal` aborts when the record disappears or the plugin unloads, not on hiding or Session switching. `tab.actions` provides `openResource`, `openTab`, and `close`, bound to the tab's own Session. Open placement defaults to its current pane; `revealIfOpened` defaults to `true`, and `replaceTab: true` replaces this record in the same history entry. Menu entries retain plain `tab` and `dismiss` owner parameters.
 
 `navigation.revision` increments on every navigation to the tab whether or not `params` changed, so a body can act on "navigated again" alone; it is `1` for a tab opened by address and `0` for a record nobody opened by address — a seeded guide, or a tab restored by undo. The Tab domain holds one occurrence per open record: a record that appears is pinned in the resource model, so switching tabs unmounts a body without dropping its content; a record that vanishes is aborted and dropped; a record restored by undo is a new occurrence ([Tab domain](../../packages/client/ui-sidebar-right/README.md#the-tab-domain)).
 
diff --git a/docs/subsystems/sidebar-right.zh.md b/docs/subsystems/sidebar-right.zh.md
index 63f2c10810..a588dc99b9 100644
--- a/docs/subsystems/sidebar-right.zh.md
+++ b/docs/subsystems/sidebar-right.zh.md
@@ -8,7 +8,7 @@
 
 ## 定位与归属
 
-每个会话恰有一个停靠面，保存在会话作用域的 slot store 里、由 `rightbar.session` 绘制。root 作用域的 `rightbar` 控制器仅在选中 Conversation 时挂载该席位；刷新页面后每个会话回到折叠的默认态，切换会话时各自的面保持原状（[状态](../../packages/client/ui-sidebar-right/README.zh.md#state)）。面的每一次变化都是 kit 纯规划器算出的一条历史记录；停靠的 pane 从不空着，根 pane 为空时会加入根据已注册引导入口选出的默认页。
+每个会话恰有一个停靠面，保存在会话作用域的 slot store 里、由 `rightbar.session` 绘制。root 作用域的 `rightbar` 控制器为选中 Session 和拥有已初始化 `keepMounted` 正文的后台 Session 保留独立席位；只有前台 Conversation 可见。刷新会恢复已保存的布局（[状态](../../packages/client/ui-sidebar-right/README.zh.md#state)）。面的每一次变化都是 kit 纯规划器算出的一条历史记录；停靠的 pane 从不空着，根 pane 为空时会加入根据已注册引导入口选出的默认页。
 
 一个 tab 类型是共用定义 `id` 的两次注册：在 `ctx.sidebarRightTabs` 里的静态定义说明其 `kind` 打开哪些地址，一次 keyed slot 注册提供它的正文。框架注入 `useTabInfo()` 以读取 Sidebar、窗格和标签的实时信息；各类型把自身状态放在 slot store 里。各包之间只以类型形式引用彼此的声明。
 
@@ -43,6 +43,7 @@ tab 身份是 `(kind, address)` 二元组：注册表的认领把地址原文用
 | `priority` | 三档字面量之一：`extension`（缺省且最高：产品之外的类型压过所有内置查看器）、`builtin`（随产品发布的类型）、`fallback`（任何更具体的类型都应压过的纯内容查看器）。 |
 | `canOpen(address)` | 可选的同步否决，对 glob 命中生效；每次路由决策都会调用。 |
 | `title(address)` | chip 文本，在 tab 打开时捕获进布局记录，之后不再改写。 |
+| `keepMounted` | 可选的懒保活：已访问正文跨隐藏、Session 切换与停靠切换保留，由所属 View 持有 Session reference。 |
 | `guide` | 可选的引导页入口框：`{ order, title(), description?(), icon? }`。点一框即把贡献它的类型作为页面打开；省略即不上引导页。 |
 
 路由是一次排序认领。`candidates(address)` 对模式命中且未被 `canOpen` 否决的类型排序：先按档，再按最长命中模式的长度，最后按注册顺序。`claim(address, kind?)` 取第一个候选，或直接用点名的 `kind`——跳过它的 glob，但 `canOpen` 仍生效——返回 `{ kind, contentId: address, title }`。没有任何类型认领的地址会抛错：这是接线错误，不是用户错误。
@@ -101,7 +102,7 @@ Sidebar 声明四个扩展 slot；其文档 tab 另行声明下表中的 keyed 
 | `sidebar.right.tab.menu.item` | list，会话作用域 | 追加在 kit 自身布局动作之后的内容级动作。执行了动作的条目必须调用 owner 的 `dismiss()`。 |
 | `sidebar.right.tab.document` | 按文档实现的 `id` keyed，会话作用域 | 文档 tab 内选中的文件渲染器；父组件拥有共享加载与工具栏控件。 |
 
-正文、标题与引导页替换项接收框架注入的 `useTabInfo()`。它返回 `{ sidebar, panel, tab }`：`sidebar` 包含 `expanded` 与 `fullscreen`，`panel.id` 标识所属窗格，`tab` 包含记录字段以及 `visible`、`navigation`、`signal` 和 `actions`。停靠正文仅在展开且活跃时可见；停靠标题只要求展开；浮窗保持可见。`signal` 在记录消失或插件卸载时中止，不因隐藏或切换 Session 而中止。`tab.actions` 提供绑定到标签所属 Session 的 `openResource`、`openTab` 与 `close`。打开位置缺省为当前所属窗格；`revealIfOpened` 缺省为 `true`，`replaceTab: true` 在同一历史项中替换本记录。菜单项保留普通的 `tab` 与 `dismiss` owner 参数。
+正文、标题与引导页替换项接收框架注入的 `useTabInfo()`。它返回 `{ sidebar, panel, tab }`：`sidebar` 包含 `expanded` 与 `fullscreen`，`panel.id` 标识所属窗格，`tab` 包含记录字段以及 `visible`、`navigation`、`signal` 和 `actions`。所有 tab 都要求 Session 位于前台。停靠正文还要求展开且选中；停靠标题要求展开；前台浮窗不随整栏收起。`signal` 在记录消失或插件卸载时中止，不因隐藏或切换 Session 而中止。`tab.actions` 提供绑定到标签所属 Session 的 `openResource`、`openTab` 与 `close`。打开位置缺省为当前所属窗格；`revealIfOpened` 缺省为 `true`，`replaceTab: true` 在同一历史项中替换本记录。菜单项保留普通的 `tab` 与 `dismiss` owner 参数。
 
 `navigation.revision` 在每次导航到该 tab 时递增，`params` 不变也递增，正文可仅凭「又被导航了」行动；按地址打开的 tab 为 `1`，没有人按地址打开的记录——种入的引导、撤销恢复的 tab——为 `0`。Tab 域为每条打开的记录保有一个 occurrence：记录出现即在资源模型里钉住，因此切换 tab 卸载正文也不丢内容；记录消失即中止并丢弃；撤销恢复的记录是新的 occurrence（[Tab 域](../../packages/client/ui-sidebar-right/README.zh.md#the-tab-domain)）。
 
diff --git a/packages/client/ui-dockkit/README.i18n.yaml b/packages/client/ui-dockkit/README.i18n.yaml
index bbf8417672..333cd57389 100644
--- a/packages/client/ui-dockkit/README.i18n.yaml
+++ b/packages/client/ui-dockkit/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-dockkit/README.md
-README.md: f41668ad2eb6c16e13deb5fcc554c8717811a468
-README.zh.md: 6a4c70a1ddb46b75b614e9e63eaddd89f3641ac3
+README.md: 613cdbcb105108eb848160f1cb6bc8ee28d39fac
+README.zh.md: 77b256f01dd46aea5144e9f8da644fd39330f187
diff --git a/packages/client/ui-dockkit/README.md b/packages/client/ui-dockkit/README.md
index f41668ad2e..613cdbcb10 100644
--- a/packages/client/ui-dockkit/README.md
+++ b/packages/client/ui-dockkit/README.md
@@ -50,13 +50,15 @@ Everything host-specific arrives through props:
 | `TabRenderer` | one tab's body (`renderTab`), drawn flush to the pane's edges and the unbordered strip's bottom edge with the insets it chooses, and optionally what its chip or panel header shows as a title (`renderTabTitle`, falling back to the record's `title`); the embedder dispatches on `tab.kind` |
 | `DockIntents` | the settled results of every gesture |
 
-`DockController` satisfies `DockIntents` as written, so the simplest embedding hands the controller straight to `DockSurface`. An embedder that routes through its own store implements the same method names instead. Three props carry control policy rather than gestures: `canSplit` (surface-wide, the pane budget; disables the split control with `splitPaneDisabled`), `canAddTab(paneId)` (per pane, omits the add control; leave it out to draw one in every pane), and `canCloseTab(tabId)` (per tab, withholds the chip's close control and the menu's close item together; leave it out to keep every tab closable). Hiding the add control moves nothing else in the strip, and a withheld close moves nothing in the chip — the close control paints over the title's end rather than beside it. A pane's lone chip whose close is withheld draws quiet — no capsule, no hover fill — since there is nothing to select against and nothing to do to it. The kit adds one policy of its own, the room rule below, which disables a pane's split control with `splitPaneNarrow`; `onRoom(fits)` reports its readings so an embedder splitting programmatically can honour the same rule.
+`DockController` satisfies `DockIntents` as written, so an embedding can pass it to `DockLayout` for retained Sidebar layouts or `DockSurface` for recursive split trees. An embedder that routes through its own store implements the same method names instead. Three props carry control policy rather than gestures: `canSplit` (surface-wide, the pane budget; disables the split control with `splitPaneDisabled`), `canAddTab(paneId)` (per pane, omits the add control; leave it out to draw one in every pane), and `canCloseTab(tabId)` (per tab, withholds the chip's close control and the menu's close item together; leave it out to keep every tab closable). Hiding the add control moves nothing else in the strip, and a withheld close moves nothing in the chip — the close control paints over the title's end rather than beside it. A pane's lone chip whose close is withheld draws quiet — no capsule, no hover fill — since there is nothing to select against and nothing to do to it. The kit adds one policy of its own, the room rule below, which disables a pane's split control with `splitPaneNarrow`; `onRoom(fits)` reports its readings so an embedder splitting programmatically can honour the same rule.
 
 `dropZones="horizontal"` offers two half-pane hints; once budget or width forbids another split, the whole body accepts a move. A hint is a dashed card inset 8px inside its region, showing the zone's glyph and `labels.dropZone[zone]`; the preview layer covers all tab-body content, while the card under the pointer takes the accent and its neighbour stays a quiet outline. `minPaneFraction` sets the preview minimum, and `planResizeSplit` accepts the same minimum for the committed operation. The Sidebar uses 0.2 and enforces two panes in its own store. The generic engine retains its tree and other split directions. `hideSplitWhenBlocked` hides a blocked split control — pane budget spent or pane too narrow — instead of rendering it disabled; its default is false.
 
 A tab's `kind` is an opaque string. Seeded tabs are factories (`DockControllerOptions`), so what a fresh pane contains is the embedder's decision, not this package's. Content identity is the pair (`kind`, `contentId`): `findContentTab(state, contentId, kind?)` finds the tab showing it anywhere and `findPaneContentTab(state, paneId, contentId, kind?)` within one pane, and `planOpenContent` focuses that tab instead of opening another unless told `revealIfOpened: false`; an explicit `index` seats a new tab at a strip slot rather than at the end.
 
-`DockSurface` is the docked area. Chrome around it — a rail, a collapsed presentation, any history controls — belongs to the embedder, which reads `state.expanded` and decides; the kit ships no undo/redo control of its own. Surface-wide controls the embedder does want on the surface go through the `chrome` prop, which the kit places at the far end of the top-right pane's tab strip (the last child of every row split, the first of every column split), so a surface needs no header row of its own. `FloatLayer` owns its own gestures and positions panels in viewport coordinates, so it may be mounted anywhere, including a portal.
+`DockLayout`, used by the Sidebar, keeps each tab in a stable DOM cell across selection, pane moves and floating. It accepts one docked pane or two horizontal panes; CSS Grid resolves their widths. `keepMounted(tab)` retains visited bodies and `active` controls Session visibility without reparenting content.
+
+`DockSurface` is the docked area for the separate recursive renderer. Chrome around it — a rail, a collapsed presentation, any history controls — belongs to the embedder, which reads `state.expanded` and decides; the kit ships no undo/redo control of its own. Surface-wide controls the embedder does want on the surface go through the `chrome` prop, which the kit places at the far end of the top-right pane's tab strip (the last child of every row split, the first of every column split), so a surface needs no header row of its own. `FloatLayer` owns its own gestures and positions panels in viewport coordinates, so it may be mounted anywhere, including a portal.
 
 <a id="interaction-rules-worth-keeping"></a>
 ## Interaction rules worth keeping
diff --git a/packages/client/ui-dockkit/README.zh.md b/packages/client/ui-dockkit/README.zh.md
index 6a4c70a1dd..77b256f01d 100644
--- a/packages/client/ui-dockkit/README.zh.md
+++ b/packages/client/ui-dockkit/README.zh.md
@@ -50,13 +50,15 @@ kind: "package-reference"
 | `TabRenderer` | 一个 tab 的正文（`renderTab`），贴着格的边缘和（不带边线的）tab 条底边绘制、自己决定留白，以及可选的 chip 或浮窗头部显示的标题（`renderTabTitle`，回退到记录的 `title`）；嵌入方按 `tab.kind` 分发 |
 | `DockIntents` | 每次手势落定的结果 |
 
-`DockController` 原样满足 `DockIntents`，所以最简单的嵌入就是把 controller 直接交给 `DockSurface`。经由自己 store 路由的嵌入方则实现同名方法。有三个 props 承载的是控制策略而非手势：`canSplit`（整面有效，即格预算；用 `splitPaneDisabled` 禁用分栏控件）、`canAddTab(paneId)`（按格，省略添加控件；不传则每格都画）与 `canCloseTab(tabId)`（按 tab，把 chip 的关闭控件和菜单的关闭项一并收起；不传则每个 tab 都可关闭）。隐藏添加控件不会移动 tab 条里的其它任何东西，收起关闭也不会移动 chip 里的任何东西——关闭控件压在标题末端之上而非并排。某格仅剩的一个 chip 在关闭被收起时画成安静样式——没有胶囊底色，没有悬停填充——因为既没有别的 tab 可供选择，也没有任何可对它做的事。套件自己再加一条策略，即下文的空间规则，它用 `splitPaneNarrow` 禁用某格的分栏控件；`onRoom(fits)` 上报其读数，让以编程方式分栏的嵌入方能遵守同一规则。
+`DockController` 原样满足 `DockIntents`，因此嵌入方可将它交给 `DockLayout` 来保活 Sidebar 布局，或交给 `DockSurface` 来渲染递归分割树。经由自己 store 路由的嵌入方则实现同名方法。有三个 props 承载的是控制策略而非手势：`canSplit`（整面有效，即格预算；用 `splitPaneDisabled` 禁用分栏控件）、`canAddTab(paneId)`（按格，省略添加控件；不传则每格都画）与 `canCloseTab(tabId)`（按 tab，把 chip 的关闭控件和菜单的关闭项一并收起；不传则每个 tab 都可关闭）。隐藏添加控件不会移动 tab 条里的其它任何东西，收起关闭也不会移动 chip 里的任何东西——关闭控件压在标题末端之上而非并排。某格仅剩的一个 chip 在关闭被收起时画成安静样式——没有胶囊底色，没有悬停填充——因为既没有别的 tab 可供选择，也没有任何可对它做的事。套件自己再加一条策略，即下文的空间规则，它用 `splitPaneNarrow` 禁用某格的分栏控件；`onRoom(fits)` 上报其读数，让以编程方式分栏的嵌入方能遵守同一规则。
 
 `dropZones="horizontal"` 提供左右两个半区提示；预算或宽度不允许再拆时，正文整格接收移动。提示是一张内缩 8px 的虚线卡片，显示该落区的图形和 `labels.dropZone[zone]`；预览层覆盖全部 tab 正文，指针所在的卡片取强调色，另一张保持安静的轮廓。`minPaneFraction` 控制预览的最小比例，`planResizeSplit` 接受相同最小值以约束提交；Sidebar使用0.2并在自己的store限制两格。通用引擎仍保留原有树与其它分割方向。 `hideSplitWhenBlocked` 在分栏被阻止时（窗格预算已满或格太窄）直接隐藏分栏控件而不是渲染禁用态，默认值为 false。
 
 tab 的 `kind` 是不透明字符串。种子 tab 是工厂（`DockControllerOptions`），因此新格里放什么由嵌入方决定，与本包无关。内容身份是二元组（`kind`、`contentId`）：`findContentTab(state, contentId, kind?)` 在任意位置找到展示它的 tab，`findPaneContentTab(state, paneId, contentId, kind?)` 在一个格内找；`planOpenContent` 会聚焦该 tab 而非再开一个，除非被告知 `revealIfOpened: false`；显式的 `index` 把新 tab 放到 tab 条的某个位置而非末尾。
 
-`DockSurface` 是停靠区。它周围的 chrome——轨道、折叠形态、任何历史控件——属于嵌入方，由嵌入方读取 `state.expanded` 后自行决定；套件不自带撤销/重做控件。嵌入方确实想放到面上的整面控件通过 `chrome` prop 传入，套件把它放在右上格 tab 条的最末端（每个横向分裂的最后一个子节点、每个纵向分裂的第一个子节点），因此停靠面不需要自己的标题行。`FloatLayer` 拥有自己的手势并以视口坐标定位浮窗，因此可以挂在任何位置，包括 portal 里。
+Sidebar 使用的 `DockLayout` 在选中项变化、跨格移动与浮动期间，把每个 tab 保留在稳定的 DOM 容器中。它接受一个停靠格或左右两个格，由 CSS Grid 计算宽度。`keepMounted(tab)` 保留已访问正文，`active` 控制 Session 可见性，不改变内容的父子关系。
+
+`DockSurface` 是独立递归渲染器的停靠区。它周围的 chrome——轨道、折叠形态、任何历史控件——属于嵌入方，由嵌入方读取 `state.expanded` 后自行决定；套件不自带撤销/重做控件。嵌入方确实想放到面上的整面控件通过 `chrome` prop 传入，套件把它放在右上格 tab 条的最末端（每个横向分裂的最后一个子节点、每个纵向分裂的第一个子节点），因此停靠面不需要自己的标题行。`FloatLayer` 拥有自己的手势并以视口坐标定位浮窗，因此可以挂在任何位置，包括 portal 里。
 
 <a id="interaction-rules-worth-keeping"></a>
 ## 值得保留的交互规则
diff --git a/packages/client/ui-sidebar-browser/README.i18n.yaml b/packages/client/ui-sidebar-browser/README.i18n.yaml
index 455edd84ea..9cd455c8d6 100644
--- a/packages/client/ui-sidebar-browser/README.i18n.yaml
+++ b/packages/client/ui-sidebar-browser/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-sidebar-browser/README.md
-README.md: dcfaccdfb85cdada9300aadb2f6e9058dc5a95bc
-README.zh.md: 8d5c34ab4c1b4d87e2a25912f38f102442f7a454
+README.md: 52ebeddd088a8427b1bf058442b6fab6a768de37
+README.zh.md: 93df01dbe13bfa4a5aa318a1fd3a9e9786cd3c67
diff --git a/packages/client/ui-sidebar-browser/README.md b/packages/client/ui-sidebar-browser/README.md
index dcfaccdfb8..52ebeddd08 100644
--- a/packages/client/ui-sidebar-browser/README.md
+++ b/packages/client/ui-sidebar-browser/README.md
@@ -9,7 +9,7 @@ English | [中文](README.zh.md)
 
 ## Summary
 
-Browse HTTP(S) pages, including loopback services, inside independent right-Sidebar tabs. The current carrier is an iframe with application-managed history in both Web and Desktop. The package never injects Electron or Node access into visited content.
+Browse HTTP(S) pages, including loopback services, inside independent right-Sidebar tabs. Web uses an iframe with application-managed history; Desktop uses Electron `<webview>` with native navigation history and retained pages. The package never injects Electron or Node access into visited content.
 
 ## Table of Contents
 
@@ -42,7 +42,7 @@ The package has no plugin configuration. A Web profile enables the shipped entry
 
 Client plugins can open a tab through `ctx.sidebarRight.openTab('browser', { params: { url } })`. The optional URL passes the same validation as address-bar input before navigation.
 
-The toolbar provides Back, Forward, Reload, Go, Open in system browser, and a rightmost per-tab sandbox toggle. Disabling the sandbox is temporary and displays a warning. The external action accepts a known HTTP(S) target. The tab title is the Web host.
+The toolbar provides Back, Forward, Reload, Go, and Open in system browser. Web also offers a per-tab sandbox toggle; disabling it is temporary and displays a warning. Desktop shows the observed page title. After a restart, Browser shows the saved title and URL; Restore or Reload opens that address only when requested.
 
 -----
 
@@ -58,15 +58,15 @@ The address parser accepts HTTP and HTTPS, including loopback targets. It reject
 
 ### Iframe carrier
 
-Web and Desktop use `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"` by default. The frame has no direct download or top-navigation flag. Popups leave the sandbox; in Web, an escaped popup retains its opener and can navigate the top-level application. The visited origin can use its own cookies and Web storage but a cross-origin target cannot read DSH DOM, storage, or API responses. The iframe sends no referrer and adds no package-owned Permissions Policy, so browser defaults and user grants apply. The toolbar can remove the sandbox for the current tab occurrence; the choice is not persisted. An unsandboxed page can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. The package does not proxy or probe remote pages.
+Web uses `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"` by default. The frame has no direct download or top-navigation flag. Popups leave the sandbox; in Web, an escaped popup retains its opener and can navigate the top-level application. The visited origin can use its own cookies and Web storage but a cross-origin target cannot read DSH DOM, storage, or API responses. The iframe sends no referrer and adds no package-owned Permissions Policy, so browser defaults and user grants apply. The toolbar can remove the sandbox for the current tab occurrence; the choice is not persisted. An unsandboxed page can navigate the top-level application under browser activation rules and use downloads, modal dialogs, and input locks. The package does not proxy or probe remote pages.
 
 Web records toolbar submissions and typed tab opens. A navigation state machine treats the first iframe load for each controlled revision as known and a later load as proof that the page changed to an unreadable URL. In that unknown state the address is marked, Back, Forward, and external-open are disabled, and Reload returns to the last controlled URL. A remounted body reloads the latest application-known URL and uses its optional initial URL only before the first controlled target. History API and fragment changes that emit no iframe load remain invisible. An iframe `error` event displays a transient load-failure notice until the next controlled load without changing URL history.
 
 ### Controller
 
-Each tab receives one `BrowserController` class. Its public commands are `loadUrl`, `goBack`, `goForward`, and `reload`; address validation and history mutation stay behind that object. Its `BrowserNavigation` class owns the serializable URL state machine. The `BrowserFrame` interface owns transient sandbox and document state plus carrier operations, and `IframeImpl` implements that interface for the current iframe carrier. Slot injection exposes keyed frame state through `useBrowserFrame` and supplies plain callbacks, so the React body receives neither the controller nor an observable source; it keeps only the editable draft and iframe DOM.
+Each tab's `BrowserController` owns address validation, commands and explicit restoration. `BrowserFrame` supplies carrier-neutral navigation state; `IframeImpl` uses `BrowserNavigation`, while `ElectronWebViewImpl` observes Chromium history. `BrowserPresentation` owns physical DOM attachment. Slot injection supplies `useBrowserState` and plain callbacks, keeping provider objects and observables out of the React body.
 
-The controller interface does not depend on iframe APIs. A future `ElectronWebViewImpl` can implement `BrowserFrame` while owning `<webview>` attachment and target identity. That deferred carrier is documented in the same Sidebar Browser decision, but is not registered or tested today.
+Desktop's main process approves guest leases and enforces attachment, navigation and permission policy. Preload exposes only scoped Browser operations. Shared declarations use the standard `/types` export with `import type`; the Host and Client compile through separate tsconfig files. Desktop Browser tabs declare `keepMounted`, so Sidebar preserves their DOM across tab changes, Session switches, collapse and floating.
 
 </details>
 
@@ -77,7 +77,8 @@ The controller interface does not depend on iframe APIs. A future `ElectronWebVi
 
 - [Right Sidebar](../../../docs/subsystems/sidebar-right.md) — tab composition, navigation, and lifecycle.
 - [Document Preview](../ui-sidebar-documentpreview/README.md) — local source, Markdown, images, HTML, and PDF rendering.
-- [Sidebar Browser decision](../../../.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md) — current iframe behavior, controller ownership, and deferred Electron carrier.
+- [Sidebar Browser decision](../../../.agents/notes/implemented/feature/2026-09-16-sidebar-browser.md) — iframe behavior and controller ownership.
+- [Desktop Browser decision](../../../.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md) — webview leases, CWD storage grouping and manual restoration.
 
 -----
 
@@ -100,9 +101,9 @@ The isolation policy deliberately gives up some browser compatibility:
 - In Web, a popup that escapes the sandbox retains its opener and can use that chain to navigate the top-level application. Desktop handles popup creation separately.
 - A later iframe load reveals that navigation occurred but not the new cross-origin URL. History API and fragment changes may remain invisible; Web Back and Forward are unavailable after the state becomes unknown.
 - Browsers conceal many iframe failures for security: DNS, TLS, mixed-content, CSP, and `X-Frame-Options` failures may emit `load` or no actionable event instead of `error`. The load-failure notice is best-effort.
-- Browser history survives body remounts and ordinary page reloads, but closing the tab or unloading `ui-sidebar-right` aborts its occurrence and removes the stored history bucket.
+- Saved title and URL survive reloads and plugin unload while the tab remains in Sidebar's layout. Closing the tab removes its checkpoint. Restart restoration does not recover page memory, unsaved forms or Chromium's history stack.
 - Local files are rejected and remain owned by Document Preview.
-- The proposed Electron `<webview>` carrier, per-tab cookie partitions, native history, and target-specific CDP connection are not implemented.
+- Desktop shares process-local storage partitions by canonical workspace CWD; Sessions without a resolved Workspace are isolated separately. Cookies and Web storage do not survive application restart. Guest permissions, downloads and native popups are denied; approved HTTP(S) popup requests open Sidebar tabs. Host-address filtering is not a general private-network or DNS-rebinding firewall.
 
 <a id="dev-note"></a>
 ### Dev Note
@@ -114,4 +115,4 @@ None.
 
 </details>
 
-**Runtime invariant:** No companion is published. `BrowserNavigation` is the sole URL-state writer; the store receives its immutable snapshots, and focused controller and component tests exercise publication and cleanup directly.
+**Runtime invariant:** No companion is published. Each navigation provider owns its live state and publishes checkpoints directly; the UI consumes the same provider state through its controller.
diff --git a/packages/client/ui-sidebar-browser/README.zh.md b/packages/client/ui-sidebar-browser/README.zh.md
index 8d5c34ab4c..93df01dbe1 100644
--- a/packages/client/ui-sidebar-browser/README.zh.md
+++ b/packages/client/ui-sidebar-browser/README.zh.md
@@ -9,7 +9,7 @@ kind: "package-reference"
 
 ## 概述
 
-在独立的右侧 Sidebar tab 中浏览 HTTP(S) 页面，包括 loopback 服务。当前 Web 与 Desktop 都使用 iframe 和应用维护的 history。本包不会向被访问内容注入 Electron 或 Node 能力。
+在独立的右侧 Sidebar tab 中浏览 HTTP(S) 页面，包括 loopback 服务。Web 使用 iframe 和应用维护的 history；Desktop 使用 Electron `<webview>`、原生导航 history 和保活页面。本包不会向被访问内容注入 Electron 或 Node 能力。
 
 ## 目录
 
@@ -42,7 +42,7 @@ Browser 在 Web profile 中默认禁用，在 Desktop 中默认启用。Web 用
 
 Client 插件可以调用 `ctx.sidebarRight.openTab('browser', { params: { url } })` 打开 tab。可选 URL 会在导航前接受与地址栏输入相同的校验。
 
-工具栏提供后退、前进、刷新、前往、在系统浏览器中打开，以及最右侧的逐 tab sandbox 开关。关闭 sandbox 是临时选择，并会显示警告。外部打开接受已知的 HTTP(S) 目标。tab 标题显示 Web 主机名。
+工具栏提供后退、前进、刷新、前往和在系统浏览器中打开。Web 还提供逐 tab sandbox 开关；关闭它是临时选择，并会显示警告。Desktop 显示观察到的页面标题。重启后，Browser 展示保存的标题和 URL；只有点击恢复或刷新才打开该地址。
 
 -----
 
@@ -58,15 +58,15 @@ Client 插件可以调用 `ctx.sidebarRight.openTab('browser', { params: { url }
 
 ### Iframe 载体
 
-Web 与 Desktop 默认使用 `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`。frame 没有直接的下载或顶层导航 flag。popup 会脱离 sandbox；在 Web 中，逃逸的 popup 会保留 opener，并可以导航顶层应用。被访问的 origin 可以使用自身 Cookie 与 Web storage，但跨域目标无法读取 DSH DOM、storage 或 API 响应。iframe 不发送 referrer，也不添加包自有的 Permissions Policy，因此浏览器默认策略与用户授权生效。toolbar 可以为当前 tab occurrence 移除 sandbox；该选择不持久化。未受 sandbox 约束的页面可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。本包不代理或探测远程页面。
+Web 默认使用 `sandbox="allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox"`。frame 没有直接的下载或顶层导航 flag。popup 会脱离 sandbox；在 Web 中，逃逸的 popup 会保留 opener，并可以导航顶层应用。被访问的 origin 可以使用自身 Cookie 与 Web storage，但跨域目标无法读取 DSH DOM、storage 或 API 响应。iframe 不发送 referrer，也不添加包自有的 Permissions Policy，因此浏览器默认策略与用户授权生效。toolbar 可以为当前 tab occurrence 移除 sandbox；该选择不持久化。未受 sandbox 约束的页面可以按浏览器 activation 规则导航顶层应用，并使用下载、模态对话框和输入锁定。本包不代理或探测远程页面。
 
 Web 记录 toolbar 提交和 typed tab 打开。导航状态机把每个受控 revision 的第一次 iframe load 视为已知，把后续 load 视为页面已经变化到不可读取 URL 的证据。进入 unknown 状态后，地址会显示标记，后退、前进和外部打开会禁用，刷新则返回最后一个受控 URL。body 重挂载时会重新加载应用最后已知的 URL，并且仅在尚无受控目标时使用可选初始 URL。不产生 iframe load 的 History API 与 fragment 变化仍不可见。iframe `error` event 会显示临时加载失败 notice，直到下一个受控加载，但不会改变 URL history。
 
 ### Controller
 
-每个 tab 获得一个 `BrowserController` class。它的公开命令只有 `loadUrl`、`goBack`、`goForward` 与 `reload`；地址校验与 history 变更均由该对象封装。它的 `BrowserNavigation` class 拥有可序列化的 URL 状态机。`BrowserFrame` 接口负责临时 sandbox 与 document 状态以及载体操作，`IframeImpl` 为当前 iframe 载体实现该接口。Slot injection 通过 `useBrowserFrame` 提供按 key 索引的 frame 状态，并提供普通 callback，因此 React body 不接收 controller 或 observable source；它只保留可编辑草稿与 iframe DOM。
+每个 tab 的 `BrowserController` 负责地址校验、命令和显式恢复。`BrowserFrame` 提供与载体无关的导航状态；`IframeImpl` 使用 `BrowserNavigation`，`ElectronWebViewImpl` 观察 Chromium history。`BrowserPresentation` 负责 DOM 的物理挂载。Slot injection 提供 `useBrowserState` 和普通 callback，React body 不接收 provider 对象或 observable。
 
-Controller 接口不依赖 iframe API。未来的 `ElectronWebViewImpl` 可以实现 `BrowserFrame`，并持有 `<webview>` attachment 与 target identity。该延期载体记录在同一份 Sidebar Browser 决策中，当前不注册也不测试。
+Desktop 主进程批准 guest 租约，并执行挂载、导航和权限策略。preload 只暴露限定范围的 Browser 操作。共享声明通过标准 `/types` 出口配合 `import type` 引入；Host 与 Client 使用独立 tsconfig 编译。Desktop Browser tab 声明 `keepMounted`，Sidebar 因而在切 tab、切 Session、收起与浮动期间保留其 DOM。
 
 </details>
 
@@ -77,7 +77,8 @@ Controller 接口不依赖 iframe API。未来的 `ElectronWebViewImpl` 可以
 
 - [右侧 Sidebar](../../../docs/subsystems/sidebar-right.zh.md)——tab composition、导航与生命周期。
 - [Document Preview](../ui-sidebar-documentpreview/README.zh.md)——本地源码、Markdown、图片、HTML 与 PDF 渲染。
-- [Sidebar Browser 决策](../../../.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md)——当前 iframe 行为、controller 所有权与延期 Electron 载体。
+- [Sidebar Browser 决策](../../../.agents/notes/implemented/feature/2026-09-16-sidebar-browser.zh.md)——iframe 行为与 controller 所有权。
+- [Desktop Browser 决策](../../../.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md)——webview 租约、CWD 存储分组与手动恢复。
 
 -----
 
@@ -100,9 +101,9 @@ Controller 接口不依赖 iframe API。未来的 `ElectronWebViewImpl` 可以
 - 在 Web 中，逃逸出 sandbox 的 popup 会保留 opener，并可以通过该链导航顶层应用。Desktop 会单独处理 popup 创建。
 - 后续 iframe load 能表明发生了导航，但无法给出新的跨域 URL。History API 与 fragment 变化可能仍不可见；状态变成 unknown 后，Web 的后退与前进不可用。
 - 出于安全原因，浏览器会隐藏很多 iframe 失败：DNS、TLS、mixed-content、CSP 与 `X-Frame-Options` 失败可能触发 `load`，也可能不提供可操作 event，而不是触发 `error`。加载失败 notice 只能作为 best-effort 提示。
-- Browser history 会跨 body 重挂载与普通页面刷新保留，但关闭 tab 或卸载 `ui-sidebar-right` 会中止其 occurrence 并删除已存储的 history bucket。
+- 只要 tab 仍在 Sidebar 布局中，保存的标题和 URL 就会跨刷新与插件卸载保留。关闭 tab 会删除其检查点。重启恢复不恢复页面内存、未保存的表单或 Chromium history 栈。
 - 本地文件会被拒绝，并继续由 Document Preview 负责。
-- 拟议的 Electron `<webview>` 载体、per-tab Cookie partition、原生 history 和 target-specific CDP 连接尚未实现。
+- Desktop 按规范化的工作区 CWD 共享进程内存储分区；没有解析到 Workspace 的 Session 单独隔离。Cookie 与 Web storage 不跨应用重启保留。guest 权限、下载与原生 popup 均被拒绝；通过检查的 HTTP(S) popup 请求会打开 Sidebar tab。Host 地址过滤不是通用私网或 DNS-rebinding 防火墙。
 
 <a id="dev-note"></a>
 ### 开发备注
@@ -114,4 +115,4 @@ Controller 接口不依赖 iframe API。未来的 `ElectronWebViewImpl` 可以
 
 </details>
 
-**运行时不变量：** 不发布 companion。`BrowserNavigation` 是唯一的 URL 状态写入方；store 接收它的 immutable snapshot，controller 与组件的聚焦测试直接覆盖发布与清理。
+**运行时不变量：** 不发布 companion。每个导航 provider 拥有自身的实时状态并直接发布检查点；UI 通过 controller 消费同一份 provider 状态。
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
index f8a5ad8a12..5307b7d8d2 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
@@ -164,6 +164,11 @@ export class ElectronWebViewImpl implements BrowserFrame {
     element.addEventListener('did-navigate-in-page', event => {
       if ((event as NavigationEvent).isMainFrame) this.observe(true)
     }, { signal })
+    element.addEventListener('did-start-navigation', event => {
+      if ((event as NavigationEvent).isMainFrame) {
+        this.store.set({ ...this.store.getSnapshot(), loading: true, error: undefined })
+      }
+    }, { signal })
     for (const name of ['did-start-loading', 'did-stop-loading', 'page-title-updated']) {
       element.addEventListener(name, () => {
         this.observe(name === 'page-title-updated' && this.store.getSnapshot().address === 'observed')
diff --git a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
index e9327de0ad..952b8cd4f7 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
+++ b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
@@ -105,7 +105,8 @@ describe('BrowserBody', () => {
     expect(frame.getAttribute('src')).toBe('https://example.com/one')
     expect(frame.getAttribute('sandbox')).toBe(WEB_BROWSER_SANDBOX)
     expect(frame.getAttribute('allow')).toBeNull()
-    expect(frame.getAttribute('referrerpolicy')).toBe('no-referrer')
+    // jsdom does not reflect the iframe referrerPolicy property to its attribute.
+    expect(frame.referrerPolicy).toBe('no-referrer')
     const disableSandbox = mounted.view.getByRole('button', { name: zh['sandbox.disable'] })
     const protectedMark = disableSandbox.querySelector('svg path:last-child')?.getAttribute('d')
     fireEvent.click(disableSandbox)
diff --git a/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
new file mode 100644
index 0000000000..75b6cf3d09
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
@@ -0,0 +1,51 @@
+// @vitest-environment jsdom
+import { expect, it, vi } from 'vitest'
+import { ElectronWebViewImpl } from '../src/client/browser/ElectronWebViewImpl.ts'
+import { ElectronWebviewPresentation, type WebviewElement } from '../src/client/view/ElectronWebviewPresentation.ts'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../src/types.ts'
+
+it('clears a failed load when the main page retries without a toolbar command', async () => {
+  let url = 'about:blank'
+  let loading = true
+  const element: WebviewElement = Object.assign(document.createElement('div'), {
+    loadURL: vi.fn(async () => {}), getURL: () => url, getTitle: () => 'Recovered',
+    canGoBack: () => false, canGoForward: () => false, clearHistory: vi.fn(),
+    goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), isLoading: () => loading,
+  })
+  const bridge: DesktopBrowserBridge = {
+    acquire: vi.fn(async () => ({ lease: 'lease' as DesktopBrowserLeaseId, partition: 'partition' })),
+    release: vi.fn(async () => {}), onOpenRequested: () => () => {},
+  }
+  const presentation = new ElectronWebviewPresentation({ mounted: () => frame.attach(), unmounted: () => frame.detach() })
+  const frame = new ElectronWebViewImpl({ initial: undefined, persist: vi.fn(), openRequested: vi.fn() },
+    bridge, async () => 'cwd:/workspace', presentation)
+  const createElement = vi.spyOn(presentation, 'createElement').mockReturnValue(element)
+  const host = document.createElement('div')
+  host.id = 'electron-frame-retry'
+  document.body.append(host)
+  try {
+    presentation.mount(host.id)
+    frame.loadUrl({ kind: 'https', url: 'https://example.test/', title: 'Example' })
+    await vi.waitFor(() => { expect(host.firstElementChild).toBe(element) })
+    element.dispatchEvent(new Event('dom-ready'))
+    element.dispatchEvent(Object.assign(new Event('did-fail-load'), {
+      isMainFrame: true, errorCode: -105, errorDescription: 'ERR_NAME_NOT_RESOLVED',
+    }))
+    expect(frame.getSnapshot().error?.code).toBe(-105)
+    element.dispatchEvent(new Event('page-title-updated'))
+    element.dispatchEvent(Object.assign(new Event('did-start-navigation'), { isMainFrame: false }))
+    expect(frame.getSnapshot().error?.code).toBe(-105)
+
+    element.dispatchEvent(Object.assign(new Event('did-start-navigation'), { isMainFrame: true }))
+    expect(frame.getSnapshot()).toMatchObject({ error: undefined, loading: true })
+    url = 'https://example.test/recovered'
+    element.dispatchEvent(new Event('did-navigate'))
+    loading = false
+    element.dispatchEvent(new Event('did-stop-loading'))
+    expect(frame.getSnapshot()).toMatchObject({ error: undefined, loading: false, target: { url, title: 'Recovered' } })
+  } finally {
+    await frame.dispose()
+    createElement.mockRestore()
+    host.remove()
+  }
+})
diff --git a/packages/client/ui-sidebar-right/README.i18n.yaml b/packages/client/ui-sidebar-right/README.i18n.yaml
index 16d1bd6f79..e5fef88086 100644
--- a/packages/client/ui-sidebar-right/README.i18n.yaml
+++ b/packages/client/ui-sidebar-right/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-sidebar-right/README.md
-README.md: 9318723b99adb003b25cf69bf07a8419eea6d1ae
-README.zh.md: dcd6dcd59ac19c18c0a7d2e9a72e7a92a6d3bec4
+README.md: 14014cb0986222a73e962e390c2675dd7354df1c
+README.zh.md: 7686d7afa8b164bf780b4ce6f927d8829e7b3a96
diff --git a/packages/client/ui-sidebar-right/README.md b/packages/client/ui-sidebar-right/README.md
index 9318723b99..14014cb098 100644
--- a/packages/client/ui-sidebar-right/README.md
+++ b/packages/client/ui-sidebar-right/README.md
@@ -56,7 +56,7 @@ While the panel is hidden, one button in the conversation header's corner seat (
 
 The panel takes the conversation's ground colour and content font sizes rather than a raised layer of its own: it is a column of the page, not a card over it.
 
-The `rightbar` entry is a root-scoped controller. It reads `usePanelInfo` and mounts the Session-scoped `rightbar.session` subtree only while the Conversation is selected. Switching to a global panel hides the right Sidebar and releases its frame track without deleting the Session's tab state.
+The root-scoped `rightbar` entry renders the selected Session and background Sessions with initialized `keepMounted` bodies through separate `rightbar.session` subtrees. Each View owns its Session reference. Only the foreground Conversation reports a frame track and binds public navigation; other subtrees stay hidden without deleting tab state.
 
 <a id="state"></a>
 ## State
@@ -67,9 +67,9 @@ Carrying the mint counter in the surface is what makes a recorded sequence repla
 
 After every action the kit's settle planner keeps the expanded surface populated: a docked pane whose last tab was moved out or floated is merged away, and an emptied root pane receives the default page. A collapsed surface holds no such backfill — a session starts collapsed and empty, and a close that collapses the column leaves it empty — the expansion that would first show an empty layout is what seeds the default page. Explicit closing follows [the default-page and close rules](#the-guide). While expanded there is always at least one tab, and never an empty pane — so there is no separate "close pane" gesture.
 
-The docked surface's last tab carries one more rule, decided in the store's `closeTab` and mirrored to the kit through `canCloseTab`: the guide standing as the only docked tab draws no close control and no menu close item — its chip sits quiet, and with no extension item contributed a secondary press opens no menu — and a programmatic close of it records nothing; any other tab standing alone closes together with the column in one entry — the layout stays empty until the next expansion seeds its current default page. Floating panels take no part in the rule: they render whether or not the column is expanded, and their tabs close freely.
+The docked surface's last tab carries one more rule, decided in the store's `closeTab` and mirrored to the kit through `canCloseTab`: the guide standing as the only docked tab draws no close control and no menu close item — its chip sits quiet, and with no extension item contributed a secondary press opens no menu — and a programmatic close of it records nothing; any other tab standing alone closes together with the column in one entry — the layout stays empty until the next expansion seeds its current default page. Floating panels take no part in the rule: the foreground Session's floats render whether or not the column is expanded, and their tabs close freely.
 
-The store saves each Session's layout, tab identities, selection, split ratios, floating rectangles, presentation and identity counter as JSON under `dsh.sidebar-right.v1.<sessionId>` in localStorage. Reload restores that layout before tab bodies render; switching Sessions keeps their layouts independent. Providers restore their own content from the retained tab identity and resource address, including [terminal reconnection](../ui-sidebar-terminal/README.md#use-this-package). Navigation parameters, resource contents and live connections are not layout state. Undo history stays in memory and resets on reload. Saved field types, node membership, selection and identity counters are validated before adoption or startup discovery; invalid data clears only its Session key. Storage failures leave the current layout usable in memory. Windows at the same origin share the last saved layout per Session; each active window keeps its own current layout until reload.
+The store saves each Session's layout, tab identities, selection, split ratios, floating rectangles, presentation and identity counter as JSON under `dsh.sidebar-right.v1.<sessionId>` in localStorage. Reload restores that layout before tab bodies render; switching Sessions keeps their layouts independent. Providers restore their own content from the retained tab identity and resource address, including [terminal reconnection](../ui-sidebar-terminal/README.md#use-this-package). Navigation parameters, resource contents and live connections are not layout state. Undo history stays in memory and resets on reload. Saved field types, node membership, selection, identity counters and the one-pane or two-horizontal-pane dock layout are validated before adoption or startup discovery; invalid data clears only its Session key. Storage failures leave the current layout usable in memory. Windows at the same origin share the last saved layout per Session; each active window keeps its own current layout until reload.
 
 `sidebarRight.openTabs` publishes stable metadata for every open tab across saved and adopted Sessions. Startup discovery reads the layout keys without mounting dormant content, pinning files or activating Agents. Adopted stores replace their own metadata on membership commits, and permanently cleared scopes remove it. Other windows' storage writes do not overwrite this window's live membership. Providers use this inventory to restore their own resource lifetimes.
 
@@ -78,7 +78,7 @@ The store saves each Session's layout, tab identities, selection, split ratios,
 
 A tab type registers in two stages, and the shipped guide type goes through exactly the same public path a type from another package does (`ui-sidebar-documentpreview` is the live proof). Both stages sit inside the type's own `ctx.effect`, so the registration lives exactly as long as the plugin that made it.
 
-1. **The type** — `ctx.sidebarRightTabs.register({ id, kind, patterns?, priority?, canOpen?, title, guide? })`, a static declaration with no runtime hook, returning a disposer. `id` is this implementation's identity in the tab system, unique across every registration (a package name is the natural value; the shipped guide is `@deepseek-ai/dsh-client-ui-sidebar-right/guide`): a kind is not unique once an extension may take a builtin's over, so the implementation names itself, and a second registration of an `id` throws. A resource type names `patterns`, globs over `dsh-resource://` addresses: one containing `:` matches the whole address (`dsh-resource://file/**`); one without matches the URI's path at any depth, ignoring case (`*.md`), and an address that is not a URI matches no such pattern. A page type — the guide, a file tree — names none and is opened by kind. `canOpen(address)` vetoes a match. `title(address)` is the tab chip's text, captured when the tab opens. `guide` lists entry boxes for the guide page; picking one opens the contributing type as a page. A `kind` carries at most one `builtin` and one `extension` registration (the extension is in force; the builtin resumes when it leaves); any other collision on a kind throws. The `id` is also the key the type's body and title register under, so an extension and the builtin it takes over hold distinct cells and the seat renders the one in force.
+1. **The type** — `ctx.sidebarRightTabs.register({ id, kind, patterns?, priority?, canOpen?, title, guide?, keepMounted? })`, a static declaration with no runtime hook, returning a disposer. `id` is this implementation's identity in the tab system, unique across every registration (a package name is the natural value; the shipped guide is `@deepseek-ai/dsh-client-ui-sidebar-right/guide`): a kind is not unique once an extension may take a builtin's over, so the implementation names itself, and a second registration of an `id` throws. A resource type names `patterns`, globs over `dsh-resource://` addresses: one containing `:` matches the whole address (`dsh-resource://file/**`); one without matches the URI's path at any depth, ignoring case (`*.md`), and an address that is not a URI matches no such pattern. A page type — the guide, a file tree — names none and is opened by kind. `canOpen(address)` vetoes a match. `title(address)` is the tab chip's text, captured when the tab opens. `guide` lists entry boxes for the guide page; picking one opens the contributing type as a page. A `kind` carries at most one `builtin` and one `extension` registration (the extension is in force; the builtin resumes when it leaves); any other collision on a kind throws. The `id` is also the key the type's body and title register under, so an extension and the builtin it takes over hold distinct cells and the seat renders the one in force.
 2. **The body** — `ctx.slots.register({ name: 'sidebar.right.pane.tab', key: definition.id }, Body)` reads `{ sidebar, panel, tab }` through the framework-injected `useTabInfo()`. `sidebar` supplies expansion and fullscreen information; `panel.id` identifies its pane; `tab` contains the record fields, `visible`, `navigation`, `signal`, and `actions`. These are not parallel owner props; the type's own store still uses `useStore`/`actions`. Optional title registrations and guide replacements share this hook; an absent title registration uses the text captured at open time.
 
 Which type opens a resource follows the editor-resolver convention: the types whose `patterns` match are ranked by `priority` band — `extension` (a type from outside the product, the highest, and the default when none is named), `builtin`, `fallback` (plain viewers anything more specific should beat) — then by the length of the matched pattern, then by registration order; `canOpen` removes a candidate. The bands are string literals so a type in another package needs no runtime import from here. `candidates(address)` returns the ranking, `claim(address, kind?)` the decision; naming a `kind` skips its globs but keeps its `canOpen`.
@@ -97,7 +97,9 @@ Two more seats extend what is already there: `sidebar.right.tab.guide` (chain) r
 <a id="the-tab-domain"></a>
 ## The Tab domain
 
-The Tab domain retains navigation, an abort signal, and bound actions per (Session, tab id). A private assembly callback adopts each Session's store, reconciles restored records immediately, and follows its commits. Reconstructing a Session store replaces its adoption, releasing the old subscription and cleanup reference. Only record removal or plugin unload aborts the signal; closing the sidebar and switching Sessions retain records, while undo restores a new occurrence. `useTabInfo()` composes framework-bound store and navigation hooks without manual component subscriptions or render-time record creation. `tab.actions` always target their own Session; `tab.visible` distinguishes bodies from titles, and floating tabs remain visible when the sidebar closes. `adopt` is absent from the public controller.
+The Tab domain retains navigation, an abort signal, and bound actions per (Session, tab id). A private assembly callback adopts each Session's store, reconciles restored records immediately, and follows its commits. Reconstructing a Session store replaces its adoption, releasing the old subscription and cleanup reference. Only record removal or plugin unload aborts the signal; closing the sidebar and switching Sessions retain records, while undo restores a new occurrence. `useTabInfo()` composes framework-bound store and navigation hooks without manual component subscriptions or render-time record creation. `tab.actions` always target their own Session; `tab.visible` distinguishes bodies from titles and excludes background Sessions; foreground floating tabs remain visible when the sidebar closes. `adopt` is absent from the public controller.
+
+A type's `keepMounted: true` retains visited bodies across tab and Session changes, collapse, and docking. Each View supplies its stable hold callback through owner props, so rebuilding Session injection bindings does not release a body. Unvisited bodies are not mounted eagerly.
 
 Tab owners register `registerCloseHandler(kind, handler)` through an effect. A handler synchronously retains any background cleanup before allowing explicit close or replacement. The resource owner tracks completion and retry; the sidebar does not wait. A thrown handler preserves the tab. Collapse, presentation changes and plugin disposal do not invoke close handlers; the tab abort signal identifies occurrence disposal, not an explicit close.
 
@@ -132,7 +134,8 @@ None; this package neither assembles nor sends a provider request.
 
 - **Browser-local layout.** Layout does not synchronize between devices; provider-specific state requires its provider's recovery support.
 - **No surface without a session.** State is keyed by session id, so the hero screen shows nothing on the right.
-- **Hard-coded stacking.** The panel and the float host use fixed z-index values because the client has no z-index token layer yet.
+- **Hard-coded stacking.** The content tree uses a fixed stacking layer; floats reorder within it without raising that layer above menus.
+- **Retained Session deletion.** Catalog absence alone does not retire an initialized retained View; its tab lifetimes and plugin teardown own release.
 - **Undo is not exposed.** The recorded sequence is stepped only through the `@internal` service methods; product controls are deliberately absent.
 - **Titles are fixed at open time.** A type's `title(address)` is captured into the record; a live title comes only from the optional title seat.
 - **No content navigation stack.** Stepping back replays layout operations; an editor-style back/forward over visited content is not built.
diff --git a/packages/client/ui-sidebar-right/README.zh.md b/packages/client/ui-sidebar-right/README.zh.md
index dcd6dcd59a..7686d7afa8 100644
--- a/packages/client/ui-sidebar-right/README.zh.md
+++ b/packages/client/ui-sidebar-right/README.zh.md
@@ -56,7 +56,7 @@ kind: "package-reference"
 
 面板取会话区的底色与正文字号，而不是自成一层浮起的表面：它是页面的一列，不是压在页面上的卡片。
 
-`rightbar` 入口是 root 作用域的控制器。它读取 `usePanelInfo`，仅在选中会话界面时挂载 session 作用域的 `rightbar.session` 子树。切换到全局面板会隐藏右侧 Sidebar 并释放框架列宽，但不删除会话的 tab 状态。
+root 作用域的 `rightbar` 入口通过独立的 `rightbar.session` 子树渲染选中的 Session，以及拥有已初始化 `keepMounted` 正文的后台 Session。每个 View 拥有自身的 Session reference。只有前台 Conversation 上报框架列宽并绑定公共导航；其他子树保持隐藏，不删除 tab 状态。
 
 <a id="state"></a>
 ## 状态
@@ -67,9 +67,9 @@ kind: "package-reference"
 
 每个动作之后，套件的 settle planner 保证展开的停靠面有内容：最后一个 tab 被搬走或浮出的停靠格会被并掉；根格被清空时填入默认页。折叠的停靠面没有这种回填——会话以折叠且为空的停靠面开始，收起整列的关闭也让它保持为空——首次会展示空布局的那次展开才播种默认页。显式关闭遵循[默认页与关闭规则](#the-guide)。展开期间永远至少有一个 tab，永远没有空格——因此没有单独的「关闭格」手势。
 
-停靠面的最后一个 tab 还多带一条规则，由 store 的 `closeTab` 决定并经 `canCloseTab` 镜像给套件：作为唯一停靠 tab 的引导页不画关闭控件也不画菜单里的关闭项——它的 chip 呈安静样式，在没有扩展条目时次键按下也不弹出菜单——对它的编程式关闭什么都不记录；任何其它 tab 独自留下时，点击关闭会连同整列一起收起，记为一条历史，布局保持为空，直到下次展开时创建当时的默认页。浮动面板不参与这条规则：它们无论列是否展开都会渲染，其 tab 照常关闭。
+停靠面的最后一个 tab 还多带一条规则，由 store 的 `closeTab` 决定并经 `canCloseTab` 镜像给套件：作为唯一停靠 tab 的引导页不画关闭控件也不画菜单里的关闭项——它的 chip 呈安静样式，在没有扩展条目时次键按下也不弹出菜单——对它的编程式关闭什么都不记录；任何其它 tab 独自留下时，点击关闭会连同整列一起收起，记为一条历史，布局保持为空，直到下次展开时创建当时的默认页。浮动面板不参与这条规则：前台 Session 的浮窗无论列是否展开都会渲染，其 tab 照常关闭。
 
-store 将每个 Session 的布局、标签身份、选中项、分栏比例、浮窗矩形、呈现方式和身份计数以 JSON 保存到 localStorage 的 `dsh.sidebar-right.v1.<sessionId>`。刷新时在渲染标签正文前恢复布局；不同 Session 的布局独立。provider 根据保留的标签身份和资源地址恢复自身内容，包括[终端重连](../ui-sidebar-terminal/README.zh.md#use-this-package)。导航参数、资源内容和活动连接不属于布局状态。撤销历史只保留在内存中，刷新后清空。采用布局或启动探测前会校验保存字段类型、节点成员关系、选中项和身份计数；无效数据只清除对应 Session 的 key。存储失败时，当前布局仍可在内存中使用。同源窗口共享每个 Session 最后保存的布局；活动窗口在刷新前保留各自的当前布局。
+store 将每个 Session 的布局、标签身份、选中项、分栏比例、浮窗矩形、呈现方式和身份计数以 JSON 保存到 localStorage 的 `dsh.sidebar-right.v1.<sessionId>`。刷新时在渲染标签正文前恢复布局；不同 Session 的布局独立。provider 根据保留的标签身份和资源地址恢复自身内容，包括[终端重连](../ui-sidebar-terminal/README.zh.md#use-this-package)。导航参数、资源内容和活动连接不属于布局状态。撤销历史只保留在内存中，刷新后清空。采用布局或启动探测前会校验保存字段类型、节点成员关系、选中项、身份计数，以及单格或左右两格的停靠布局；无效数据只清除对应 Session 的 key。存储失败时，当前布局仍可在内存中使用。同源窗口共享每个 Session 最后保存的布局；活动窗口在刷新前保留各自的当前布局。
 
 `sidebarRight.openTabs` 发布所有已保存和已采用 Session 的打开标签元数据，并保持快照引用稳定。启动时读取布局 key，不挂载非当前内容、pin 文件或激活 Agent。已采用的 store 在标签成员变化时更新自己的元数据，永久清除的 scope 删除对应记录。其他窗口写入 storage 不会覆盖当前窗口的活动成员关系。provider 使用该清单恢复自己的资源生命周期。
 
@@ -78,7 +78,7 @@ store 将每个 Session 的布局、标签身份、选中项、分栏比例、
 
 tab 类型分两阶段注册，随包发布的引导类型走的正是别的包的类型走的同一条公开路径（`ui-sidebar-documentpreview` 是活的证明）。两个阶段都在类型自己的 `ctx.effect` 里，因此注册与创建它的插件同生共死。
 
-1. **类型**——`ctx.sidebarRightTabs.register({ id, kind, patterns?, priority?, canOpen?, title, guide? })`，一份没有运行时钩子的静态声明，返回 disposer。`id` 是这个实现在 tab 系统里的身份，在全部注册中唯一（包名是天然取值；随包引导页是 `@deepseek-ai/dsh-client-ui-sidebar-right/guide`）：一旦 extension 可以接管 builtin 的 kind，kind 就不再唯一，所以实现要自己命名，同一 `id` 的第二次注册会 throw。资源类型给出 `patterns`，即作用于 `dsh-resource://` 地址的 glob：含 `:` 的匹配整个地址（`dsh-resource://file/**`）；不含的匹配 URI 路径的任意深度且忽略大小写（`*.md`），不是 URI 的地址不匹配任何这类模式。页类型——引导页、文件树——不给出模式，按 kind 打开。`canOpen(address)` 否决一次命中。`title(address)` 是 tab chip 的文字，在 tab 打开时捕获。`guide` 列出引导页的入口框；选中一个即把贡献它的类型作为页打开。一个 `kind` 最多承载一份 `builtin` 与一份 `extension` 注册（extension 生效；它离开后 builtin 恢复）；kind 上的其它任何撞名都 throw。`id` 同时也是该类型正文与标题注册时用的 key，因此 extension 与它接管的 builtin 各占一个格位，席位渲染生效的那个。
+1. **类型**——`ctx.sidebarRightTabs.register({ id, kind, patterns?, priority?, canOpen?, title, guide?, keepMounted? })`，一份没有运行时钩子的静态声明，返回 disposer。`id` 是这个实现在 tab 系统里的身份，在全部注册中唯一（包名是天然取值；随包引导页是 `@deepseek-ai/dsh-client-ui-sidebar-right/guide`）：一旦 extension 可以接管 builtin 的 kind，kind 就不再唯一，所以实现要自己命名，同一 `id` 的第二次注册会 throw。资源类型给出 `patterns`，即作用于 `dsh-resource://` 地址的 glob：含 `:` 的匹配整个地址（`dsh-resource://file/**`）；不含的匹配 URI 路径的任意深度且忽略大小写（`*.md`），不是 URI 的地址不匹配任何这类模式。页类型——引导页、文件树——不给出模式，按 kind 打开。`canOpen(address)` 否决一次命中。`title(address)` 是 tab chip 的文字，在 tab 打开时捕获。`guide` 列出引导页的入口框；选中一个即把贡献它的类型作为页打开。一个 `kind` 最多承载一份 `builtin` 与一份 `extension` 注册（extension 生效；它离开后 builtin 恢复）；kind 上的其它任何撞名都 throw。`id` 同时也是该类型正文与标题注册时用的 key，因此 extension 与它接管的 builtin 各占一个格位，席位渲染生效的那个。
 2. **正文**——`ctx.slots.register({ name: 'sidebar.right.pane.tab', key: definition.id }, Body)` 通过框架注入的 `useTabInfo()` 读取 `{ sidebar, panel, tab }`。`sidebar` 提供开合与全屏信息，`panel.id` 命名所在格，`tab` 包含原记录字段、`visible`、`navigation`、`signal` 和 `actions`。这些字段不再作为平铺owner props传入；类型自己的store仍使用 `useStore`/`actions`。可选标题注册及引导替换共享该hook；未注册标题时使用打开时保存的文本。
 
 由哪个类型打开资源遵循编辑器解析器的惯例：`patterns` 命中的类型先按 `priority` 档排序——`extension`（产品外的类型，最高档，也是未命名时的默认）、`builtin`、`fallback`（任何更具体的类型都应胜过的通用查看器）——再按命中模式的长度，再按注册顺序；`canOpen` 会剔除候选。各档是字符串字面量，因此别的包里的类型不需要从这里做运行时导入。`candidates(address)` 返回排序，`claim(address, kind?)` 返回决定；指定 `kind` 时跳过它的 glob 但保留它的 `canOpen`。
@@ -97,7 +97,9 @@ tab 类型分两阶段注册，随包发布的引导类型走的正是别的包
 <a id="the-tab-domain"></a>
 ## Tab 域
 
-Tab 域按（Session，Tab id）保留导航、中止信号与绑定动作。私有装配回调采用各 Session 的 store，立即对齐恢复的记录，再跟随其提交。同一 Session 的 store 重建会替换其 `adopt` 注册，同时释放旧订阅与清理引用。记录消失或插件卸载才中止 signal，收起和切会话不销毁记录；undo 恢复的是新 occurrence。`useTabInfo()` 组合框架绑定的 store 与导航 hook，不在组件中手写订阅或在渲染时创建记录。`tab.actions` 始终作用于自己的会话；`tab.visible` 区分正文与标题，浮窗不受整栏收起影响。`adopt` 不在公开控制器上。
+Tab 域按（Session，Tab id）保留导航、中止信号与绑定动作。私有装配回调采用各 Session 的 store，立即对齐恢复的记录，再跟随其提交。同一 Session 的 store 重建会替换其 `adopt` 注册，同时释放旧订阅与清理引用。记录消失或插件卸载才中止 signal，收起和切会话不销毁记录；undo 恢复的是新 occurrence。`useTabInfo()` 组合框架绑定的 store 与导航 hook，不在组件中手写订阅或在渲染时创建记录。`tab.actions` 始终作用于自己的会话；`tab.visible` 区分正文与标题，并排除后台 Session；前台浮窗不受整栏收起影响。`adopt` 不在公开控制器上。
+
+类型声明 `keepMounted: true` 后，已访问正文会在切 tab、切 Session、收起和停靠切换期间保留。每个 View 通过 owner props 提供自身稳定的持有回调，因此 Session injection binding 重建不会释放正文。未访问的正文不会提前挂载。
 
 标签页所有者通过 effect 注册 `registerCloseHandler(kind, handler)`。handler 在允许显式关闭或替换前同步保存后台清理任务。资源所有者跟踪完成和重试，侧栏不等待清理。handler 抛错时保留标签页。折叠、展示方式改变和插件卸载不调用关闭 handler；tab abort signal 标识 occurrence 卸载，不代表显式关闭。
 
@@ -132,7 +134,8 @@ Tab 域按（Session，Tab id）保留导航、中止信号与绑定动作。私
 
 - **布局保存在当前浏览器。** 布局不跨设备同步；provider 专属状态需要由该 provider 支持恢复。
 - **没有会话就没有停靠面。** 状态按会话 id 键控，因此 hero 画面右侧什么都不显示。
-- **硬编码的层叠。** 面板与浮窗宿主使用固定的 z-index 值，因为客户端还没有 z-index token 层。
+- **硬编码的层叠。** 内容树使用固定层叠层；浮窗在该层内重排，不会把整层抬到菜单之上。
+- **保活 Session 的删除。** 仅从目录消失不会使已初始化的保活 View 退休；释放由 tab 生命周期和插件卸载负责。
 - **未暴露撤销。** 记录的序列只能通过 `@internal` 服务方法步进；产品控件是有意缺席的。
 - **标题在打开时固定。** 类型的 `title(address)` 被捕获进记录；会变的标题只来自可选的标题席位。
 - **没有内容导航栈。** 后退回放的是布局操作；编辑器式的「已访问内容」前进/后退尚未构建。
diff --git a/packages/client/ui-sidebar-right/src/client/contract/slots.ts b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
index 5cb8c59e5c..e4468cf80e 100644
--- a/packages/client/ui-sidebar-right/src/client/contract/slots.ts
+++ b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
@@ -25,7 +25,7 @@ import type { RightbarOwnerProps } from '@deepseek-ai/dsh-client-ui-layout/clien
 // The locale plugin's own merge carries the shared `common` vocabulary that the
 // lookup chain consults after this namespace misses.
 import type {} from '@deepseek-ai/dsh-client-locale/client'
-import type { PaneId, TabRecord } from '@deepseek-ai/dsh-client-ui-dockkit'
+import type { PaneId, TabId, TabRecord } from '@deepseek-ai/dsh-client-ui-dockkit'
 import type { SlotHookFactory } from '@deepseek-ai/dsh-client-ui-slots'
 import type { TabHookContext } from '../tab-info.ts'
 import type { SidebarRightKey } from '../locales.ts'
@@ -39,7 +39,11 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
 
   interface SlotMap {
     /** Session content selected by the root-scoped right Sidebar controller. */
-    'rightbar.session': { kind: 'single'; scope: 'session'; owner: RightbarOwnerProps & { readonly active: boolean } }
+    'rightbar.session': { kind: 'single'; scope: 'session'; owner: RightbarOwnerProps & {
+      readonly active: boolean
+      /** @param tabId - retained body. @param signal - tab occurrence lifetime. @returns releases the View-owned hold. */
+      readonly retainTab: (tabId: TabId, signal: AbortSignal) => () => void
+    } }
     /**
      * One tab's body, dispatched with the `id` of the type in force for
      * `tab.kind`. A tab type registers here under its definition's `id` and
diff --git a/packages/client/ui-sidebar-right/src/client/index.ts b/packages/client/ui-sidebar-right/src/client/index.ts
index ddad14a2b6..19c307c063 100644
--- a/packages/client/ui-sidebar-right/src/client/index.ts
+++ b/packages/client/ui-sidebar-right/src/client/index.ts
@@ -150,7 +150,7 @@ export function apply(ctx: ClientContext): void {
       },
     }
     const layout: ILayout = ctx.layout
-    const injected: Omit<SidebarRightInjected, 'keyedHooks' | 'occurrence' | 'closeTab' | 'retainTab'> = {
+    const injected: Omit<SidebarRightInjected, 'keyedHooks' | 'occurrence' | 'closeTab'> = {
       syncPresentation({ shown, track, fullscreen }) {
         if (shown) layout.openRightbar(track, fullscreen)
         else layout.closeRightbar()
@@ -187,7 +187,6 @@ export function apply(ctx: ClientContext): void {
           },
           keyedHooks: { tabNavigation: key => controller.tabDomain.occurrence(sessionId, { id: key as TabId }).navigation },
           occurrence: tab => controller.tabDomain.occurrence(sessionId, tab),
-          retainTab: tabId => views.retainTab(sessionId, tabId, controller.tabDomain.occurrence(sessionId, { id: tabId }).signal),
         }),
       }, RightbarSeat)
     })
diff --git a/packages/client/ui-sidebar-right/src/client/persistence.ts b/packages/client/ui-sidebar-right/src/client/persistence.ts
index 9fc941a837..7335573d97 100644
--- a/packages/client/ui-sidebar-right/src/client/persistence.ts
+++ b/packages/client/ui-sidebar-right/src/client/persistence.ts
@@ -38,7 +38,8 @@ function validateReferences(value: z.infer<typeof surface>): void {
     if (visited.has(id) || entry === undefined) reject()
     visited.add(id)
     if (entry.kind === 'split') {
-      if (host !== 'dock' || entry.children.length !== entry.sizes.length
+      if (host !== 'dock' || id !== layout.rootId || entry.axis !== 'row' || entry.children.length !== 2
+        || entry.children.length !== entry.sizes.length
         || Math.abs(entry.sizes.reduce((sum, size) => sum + size, 0) - 1) > 1e-9) reject()
       pending.push(...entry.children.map(id => ({ id, host })))
     } else {
diff --git a/packages/client/ui-sidebar-right/src/client/session-view.ts b/packages/client/ui-sidebar-right/src/client/session-view.ts
index 62c6f51123..369e79cf3d 100644
--- a/packages/client/ui-sidebar-right/src/client/session-view.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-view.ts
@@ -21,11 +21,13 @@ export class SidebarSessionView {
    * @param sessionId - Session displayed by this view.
    * @param sessions - allocator for this view's independent reference.
    * @param onDispose - removes this view from the collection's index before reference release.
+   * @param onTabRelease - reconsiders retention after a body releases its hold.
    */
   constructor(
     readonly sessionId: SessionId,
     sessions: ISessions,
     private readonly onDispose: (view: SidebarSessionView) => void,
+    private readonly onTabRelease: (view: SidebarSessionView) => void,
   ) {
     this.reference = sessions.retain(sessionId, { source: 'sidebarView' })
     void this.reference.ready.catch(error => { console.error('Sidebar Session opening failed:', error) })
@@ -49,10 +51,9 @@ export class SidebarSessionView {
    * Hold an initialized body until unmount or occurrence cancellation.
    * @param tabId - initialized body identity.
    * @param signal - occurrence lifetime; closing and undoing a tab creates a new lifetime.
-   * @param onRelease - lets the collection reconsider retaining this view.
    * @returns idempotent release of this body's hold.
    */
-  retainTab(tabId: TabId, signal: AbortSignal, onRelease: () => void): () => void {
+  readonly retainTab = (tabId: TabId, signal: AbortSignal): (() => void) => {
     if (signal.aborted || this.disposed) return () => {}
     this.tabs.set(tabId, (this.tabs.get(tabId) ?? 0) + 1)
     let held = true
@@ -63,7 +64,7 @@ export class SidebarSessionView {
       const count = this.tabs.get(tabId) as number
       if (count === 1) this.tabs.delete(tabId)
       else this.tabs.set(tabId, count - 1)
-      onRelease()
+      this.onTabRelease(this)
     }
     signal.addEventListener('abort', release, { once: true })
     return release
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
index badef0a31f..3031f008b0 100644
--- a/packages/client/ui-sidebar-right/src/client/session-views.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -1,7 +1,6 @@
 /** Selection and retention policy for independently owned Sidebar Session views. */
 import type { ISessions, SessionReference } from '@deepseek-ai/dsh-api-session-controller/client'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
-import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import { SidebarSessionView } from './session-view.ts'
 
@@ -10,6 +9,8 @@ export interface SidebarSessionViewSnapshot {
   readonly sessionId: SessionId
   readonly reference: SessionReference
   readonly selected: boolean
+  /** Stable for this View's lifetime, independently of Session injection bindings. */
+  readonly retainTab: SidebarSessionView['retainTab']
 }
 
 /** Selects and retires views; the Sidebar plugin's injected dependencies own global teardown. */
@@ -29,7 +30,7 @@ export class SidebarSessionViews {
     if (sessionId !== undefined && !this.views.has(sessionId)) {
       const view = new SidebarSessionView(sessionId, this.sessions, disposed => {
         this.viewsByReference.delete(disposed.reference)
-      })
+      }, released => { this.prune(released) })
       this.views.set(sessionId, view)
       this.viewsByReference.set(view.reference, view)
     }
@@ -51,20 +52,6 @@ export class SidebarSessionViews {
     return view.mount()
   }
 
-  /**
-   * Hold an initialized tab occurrence until unmount or occurrence cancellation.
-   * @param sessionId - mounted Session identity.
-   * @param tabId - initialized body identity.
-   * @param signal - occurrence lifetime; closing and undoing a tab creates a new lifetime.
-   * @returns idempotent release of this body's hold.
-   */
-  retainTab(sessionId: SessionId, tabId: TabId, signal: AbortSignal): () => void {
-    if (signal.aborted || this.closed) return () => {}
-    const view = this.views.get(sessionId)
-    if (view === undefined) throw new Error(`Sidebar Session "${sessionId}" has no mounted view`)
-    return view.retainTab(tabId, signal, () => { this.prune(view) })
-  }
-
   /** Plugin shutdown releases every view, including any awaiting a React unmount. */
   dispose(): void {
     this.closed = true
@@ -84,7 +71,7 @@ export class SidebarSessionViews {
   private publish(): void {
     if (this.closed) return
     this.source.set([...this.views.values()].sort((a, b) => a.sessionId.localeCompare(b.sessionId)).map(view => ({
-      sessionId: view.sessionId, reference: view.reference, selected: view.sessionId === this.selected,
+      sessionId: view.sessionId, reference: view.reference, selected: view.sessionId === this.selected, retainTab: view.retainTab,
     })))
   }
 }
diff --git a/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx b/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
index 79c5d7ecb1..26bedb1d18 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
+++ b/packages/client/ui-sidebar-right/src/client/shell/RightbarRoot.tsx
@@ -21,7 +21,7 @@ function SessionView({ view, visible, SessionProvider, renderSlot, mountView, wi
   const active = visible && view.selected
   return <div className={css.session} hidden={!active} data-sidebar-right-session={view.sessionId}>
     <SessionProvider session={view.reference}>
-      {renderSlot('rightbar.session', { width, viewportWidth, canShow, active })}
+      {renderSlot('rightbar.session', { width, viewportWidth, canShow, active, retainTab: view.retainTab })}
     </SessionProvider>
   </div>
 }
diff --git a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
index 87612be6af..ad19ee4a0d 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
+++ b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
@@ -107,8 +107,6 @@ export interface SidebarRightInjected {
   }
   /** Read a committed record's lifetime; never creates an occurrence. */
   readonly occurrence: (tab: Pick<TabRecord, 'id'>) => TabOccurrence
-  /** Keep this Session generation while an initialized body is retained. */
-  readonly retainTab: (tabId: TabId) => () => void
 }
 
 /** The column seat's props: session scope, so the session arrives as a standard prop. */
@@ -135,7 +133,7 @@ interface PanelProps {
   readonly fullscreen: boolean
   readonly autoFullscreen: boolean
   readonly active: boolean
-  readonly retainTab: SidebarRightInjected['retainTab']
+  readonly retainTab: RightbarSeatProps['retainTab']
   /** Receives the kit's room-rule readings for the service's `split`. */
   readonly reportRoom: (fits: ReadonlyMap<PaneId, HalvesFit>) => void
 }
@@ -190,7 +188,7 @@ function TabSlot({
   const { signal, tabActions } = occurrence(tab)
   const definition = useTabTypes(types => types.find(definition => definition.kind === tab.kind))
   const retained = seat === 'sidebar.right.pane.tab' && definition?.keepMounted === true
-  useLayoutEffect(() => retained ? retainTab(tab.id) : undefined, [retained, retainTab, tab.id, signal])
+  useLayoutEffect(() => retained ? retainTab(tab.id, signal) : undefined, [retained, retainTab, tab.id, signal])
   const hookContext = useMemo((): TabHookContext => ({
     tabId: tab.id,
     title: seat === 'sidebar.right.pane.tab.title',
diff --git a/packages/client/ui-sidebar-right/tests/apply.client.spec.ts b/packages/client/ui-sidebar-right/tests/apply.client.spec.ts
index 530334eae2..7c3489931e 100644
--- a/packages/client/ui-sidebar-right/tests/apply.client.spec.ts
+++ b/packages/client/ui-sidebar-right/tests/apply.client.spec.ts
@@ -10,6 +10,7 @@
  */
 import { describe, expect, it, vi } from 'vitest'
 import { Context } from '@deepseek-ai/cordis'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { SlotRegistry } from '@deepseek-ai/dsh-client-ui-renderer/client'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import { apply, inject } from '../src/client/index.ts'
@@ -65,6 +66,8 @@ async function boot() {
   ctx.provide('locale', locale as never)
   ctx.provide('layout', layout as never)
   ctx.provide('resources', resources as never)
+  ctx.provide('sessions', { retain: vi.fn() } as never)
+  ctx.provide('uiSession', { adapter: { current: createSnapshotStore({ key: undefined }) } } as never)
   const fiber = ctx.plugin({ inject: [...inject], apply })
   await fiber.await()
   const seat = (name: string): Recorded => {
diff --git a/packages/client/ui-sidebar-right/tests/persistence-validation.client.spec.ts b/packages/client/ui-sidebar-right/tests/persistence-validation.client.spec.ts
index 43ca6f818e..bce86c42ea 100644
--- a/packages/client/ui-sidebar-right/tests/persistence-validation.client.spec.ts
+++ b/packages/client/ui-sidebar-right/tests/persistence-validation.client.spec.ts
@@ -37,6 +37,16 @@ it.each([
   ['split cycle', { minted: 4, layout: { ...splitLayout, nodes: { ...splitLayout.nodes, split3: { ...split, children: ['split3', 'pane1'] } } } }],
   ['invalid split sum', { minted: 4, layout: { ...splitLayout, nodes: { ...splitLayout.nodes, split3: { ...split, sizes: [0.4, 0.4] } } } }],
   ['mismatched split sizes', { minted: 4, layout: { ...splitLayout, nodes: { ...splitLayout.nodes, split3: { ...split, sizes: [0.2, 0.3, 0.5] } } } }],
+  ['vertical split', { minted: 4, layout: { ...splitLayout, nodes: { ...splitLayout.nodes, split3: { ...split, axis: 'column' } } } }],
+  ['three docked panes', { minted: 5, layout: { ...splitLayout, nodes: {
+    ...splitLayout.nodes, pane5: { ...otherPane, id: 'pane5' },
+    split3: { ...split, children: ['pane1', 'pane4', 'pane5'], sizes: [0.3, 0.3, 0.4] },
+  } } }],
+  ['nested split', { minted: 6, layout: { ...splitLayout, nodes: {
+    ...splitLayout.nodes, pane6: { ...otherPane, id: 'pane6' },
+    split3: { ...split, children: ['pane1', 'split5'] },
+    split5: { ...split, id: 'split5', children: ['pane4', 'pane6'] },
+  } } }],
   ['split as active pane', { minted: 4, layout: { ...splitLayout, activePaneId: 'split3' } }],
   ['floating split', { minted: 4, layout: { ...splitLayout, floats: ['split3'] } }],
   ['float without rectangle', { minted: 3, layout: { ...empty.layout, tabs: { tab2: tab }, floats: ['float3'], nodes: { ...empty.layout.nodes, float3: { ...pane, id: 'float3', host: 'float' } } } }],
diff --git a/packages/client/ui-sidebar-right/tests/seat.client.spec.tsx b/packages/client/ui-sidebar-right/tests/seat.client.spec.tsx
index 417e3742ca..fd61162198 100644
--- a/packages/client/ui-sidebar-right/tests/seat.client.spec.tsx
+++ b/packages/client/ui-sidebar-right/tests/seat.client.spec.tsx
@@ -64,7 +64,7 @@ function transition(property = 'transform') {
   }
 }
 
-async function mountSeat(viewportWidth = 1440, canShow = true, entryCount = 0, opener = false) {
+async function mountSeat(viewportWidth = 1440, canShow = true, entryCount = 0, opener = false, keepMounted = false) {
   const runtime = await SlotTestRuntime.create()
   runtimes.push(runtime)
   const frame = { openRightbar: vi.fn(), closeRightbar: vi.fn() }
@@ -130,6 +130,7 @@ async function mountSeat(viewportWidth = 1440, canShow = true, entryCount = 0, o
     runtime.ctx.sidebarRightTabs.register({
       id: 'test/text', kind: 'text', priority: 'builtin', patterns: ['dsh-resource://file/**'],
       title: address => address.slice(address.lastIndexOf('/') + 1),
+      keepMounted,
       guide: Array.from({ length: entryCount }, (_, order) => ({ id: String(order), order, title: () => 'Test', description: () => 'Test page' })),
     })
     runtime.slots.register({ name: 'sidebar.right.pane.tab', key: 'test/text' }, Body)
@@ -161,12 +162,34 @@ function element(container: HTMLElement, selector: string): HTMLElement {
 }
 
 describe('RightbarSeat presentation', () => {
+  it('keeps a background retained body through standard-source registration and removal', async () => {
+    const h = await mountSeat(1440, true, 0, false, true)
+    const tab = h.open('retained.txt')
+    const body = element(h.view.container, `[data-tab-body="${tab.id}"]`)
+    await act(async () => { await h.runtime.sessions.add({ id: OTHER }) })
+    act(() => { h.selectSession(OTHER) })
+    expect(body.isConnected).toBe(true)
+    let withdraw = () => {}
+    act(() => {
+      withdraw = h.runtime.ctx.uiSession.provide({
+        props: ['sidebarRetentionProbe'],
+        resolve: () => ({ props: { sidebarRetentionProbe: true } }),
+      })
+    })
+    expect(element(h.view.container, `[data-tab-body="${tab.id}"]`)).toBe(body)
+    act(withdraw)
+    expect(element(h.view.container, `[data-tab-body="${tab.id}"]`)).toBe(body)
+    act(() => { h.selectSession(SESSION) })
+    expect(element(h.view.container, `[data-tab-body="${tab.id}"]`)).toBe(body)
+    expect(h.bodies.get(tab.id)?.tab.signal.aborted).toBe(false)
+  })
+
   it('hides for a global main panel and retains the Session sidebar state', async () => {
     const h = await mountSeat()
     h.open('retained.txt')
     const retained = h.layout()
     act(() => { h.runtime.panelInfo.set({ activePanelId: 'other-panel' as MainPanelId }) })
-    expect(h.view.container.querySelector('[data-sidebar-right-panel]')).toBeNull()
+    expect(element(h.view.container, '[data-sidebar-right-session]').hidden).toBe(true)
     expect(h.frame.closeRightbar).toHaveBeenCalled()
     expect(h.layout()).toBe(retained)
     act(() => { h.runtime.panelInfo.set({ activePanelId: null }) })
@@ -182,12 +205,11 @@ describe('RightbarSeat presentation', () => {
     act(() => { h.arm(true) })
     expect(h.opened).toHaveLength(1)
     expect(Object.values(h.layout().tabs).map(tab => tab.contentId)).toEqual(h.opened)
-    // A global panel unmounts both columns and the mounted seat with them.
+    // A global panel hides the Sidebar and releases its public navigation binding.
     act(() => { h.runtime.panelInfo.set({ activePanelId: 'other-panel' as MainPanelId }) })
-    expect(h.view.container.querySelector('[data-sidebar-right-panel]')).toBeNull()
+    expect(element(h.view.container, '[data-sidebar-right-session]').hidden).toBe(true)
     expect(h.controller.mounted.getSnapshot()).toBeUndefined()
-    // Returning mounts both in one commit, the Conversation's effects first; the
-    // opener sees no seat, then the seat's own effect binds and it opens.
+    // The opener waits until the foreground seat republishes its navigation binding.
     act(() => { h.runtime.panelInfo.set({ activePanelId: null }) })
     expect(h.controller.mounted.getSnapshot()).toBe(SESSION)
     expect(h.opened).toHaveLength(2)
@@ -258,7 +280,7 @@ describe('RightbarSeat presentation', () => {
   it('keeps the panel mounted while collapsed and releases the frame on unmount', async () => {
     const h = await mountSeat()
     const panel = element(h.view.container, '[data-sidebar-right-panel]')
-    expect(panel.getAttribute('aria-hidden')).toBe('true')
+    expect(panel.hasAttribute('data-sidebar-right-open')).toBe(false)
     expect(h.frame.closeRightbar).toHaveBeenCalled()
     h.open()
     expect(element(h.view.container, '[data-sidebar-right-panel]')).toBe(panel)
@@ -317,7 +339,7 @@ describe('RightbarSeat presentation', () => {
     expect(panel.style.width).toBe('420px')
     fireEvent.click(element(h.view.container, '[data-sidebar-right-mode]'))
     expect(h.layout().mode).toBe('fullscreen')
-    expect(panel.style.width).toBe('100%')
+    expect(panel.style.width).toBe('100vw')
     expect(panel.dataset['sidebarRightPanel']).toBe('fullscreen')
     expect(element(h.view.container, '[data-tab-body]')).toBe(body)
     expect(h.frame.openRightbar).toHaveBeenLastCalledWith(true, true)

From 60ef7b12613824caf8ad26d893b60b7ee7071088 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 02:29:00 +0800
Subject: [PATCH 54/62] fix(ci): refresh sidebar catalog and complete API docs

---
 .../src/client/browser/BrowserController.ts   | 32 +++++++++++++++----
 .../src/client/browser/BrowserFrame.ts        |  5 ++-
 .../src/client/browser/BrowserPersistence.ts  | 13 ++++++--
 .../src/client/browser/IframeImpl.ts          | 10 ++++--
 .../ui-sidebar-browser/src/client/pages.ts    |  7 +++-
 .../view/ElectronWebviewPresentation.ts       | 17 ++++++++--
 .../src/client/view/IframePresentation.ts     |  5 ++-
 .../src/client/session-view.ts                |  6 +++-
 .../src/client/session-views.ts               |  6 +++-
 .../src/client/slot-catalog.ts                | 15 +++++----
 10 files changed, 92 insertions(+), 24 deletions(-)

diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index 68aa56ba2b..6911f88a56 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -77,13 +77,20 @@ export class BrowserController implements HostObservable<BrowserControllerState>
   /** @param listener - state invalidation. @returns unsubscribe callback. */
   subscribe = (listener: () => void): (() => void) => this.store.subscribe(listener)
 
-  /** @param viewportId - mounted content container. @returns physical attachment cleanup only. */
+  /**
+   * Attach the page without transferring ownership of its tab occurrence.
+   * @param viewportId - mounted content container.
+   * @returns physical attachment cleanup only.
+   */
   mount(viewportId: string): () => void {
     this.publishSaved()
     return this.page.presentation.mount(viewportId)
   }
 
-  /** @param initialUrl - explicit typed-open address; a saved checkpoint alone never starts navigation. */
+  /**
+   * Consume initial navigation once; a saved checkpoint alone never starts a page.
+   * @param initialUrl - explicit typed-open address, or absence.
+   */
   start(initialUrl: string | undefined): void {
     if (this.started || this.disposed) return
     this.started = true
@@ -96,7 +103,10 @@ export class BrowserController implements HostObservable<BrowserControllerState>
     if (target !== undefined) this.loadUrl(target.url)
   }
 
-  /** @param value - address-bar or typed-open input. */
+  /**
+   * Validate an address before navigation, publishing invalid input for correction.
+   * @param value - address-bar or typed-open input.
+   */
   loadUrl(value: string): void {
     if (this.disposed) return
     const parsed = parseBrowserAddress(value, this.options.applicationOrigin)
@@ -114,16 +124,25 @@ export class BrowserController implements HostObservable<BrowserControllerState>
     else this.command(() => { this.page.frame.reload() })
   }
 
-  /** @param enabled - optional embedding-sandbox control; unavailable providers remain unchanged. */
+  /**
+   * Apply the optional embedding-sandbox control; unsupported providers remain unchanged.
+   * @param enabled - whether to enforce the provider's embedding sandbox.
+   */
   setSandbox(enabled: boolean): void {
     const sandbox = this.page.frame.sandbox
     if (sandbox !== undefined) this.command(() => { sandbox.setEnabled(enabled) })
   }
 
-  /** @param actions - writer from a replacement Session presentation binding. */
+  /**
+   * Redirect future checkpoint writes to a replacement Session binding.
+   * @param actions - replacement persistence writer.
+   */
   rebind(actions: BoundActions<BrowserStore>): void { this.actions = actions }
 
-  /** @returns after page teardown; repeated callers join the same disposal. */
+  /**
+   * Release the page and detach occurrence and state listeners.
+   * @returns after page teardown; repeated callers join the same disposal.
+   */
   dispose(): Promise<void> {
     if (this.disposal !== undefined) return this.disposal
     this.disposed = true
@@ -186,6 +205,7 @@ export interface BrowserInjected {
 }
 
 /**
+ * Own tab-occurrence controllers behind Session-scoped callbacks.
  * @param actions - persisted view-state writer.
  * @param createPage - composition-selected provider.
  * @param isTabOpen - authoritative layout membership, independent of mounted bodies and plugin lifetime.
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
index 54a7405009..6c24081a8e 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserFrame.ts
@@ -41,7 +41,10 @@ export interface BrowserFrame extends HostObservable<BrowserFrameState> {
   dispose(): Promise<void>
 }
 
-/** @returns state before any page has been requested. */
+/**
+ * Create idle navigation state without a page target.
+ * @returns state before any page has been requested.
+ */
 export function emptyBrowserFrame(): BrowserFrameState {
   return { target: undefined, address: 'empty', loading: false, canGoBack: false, canGoForward: false,
     error: undefined, sandboxEnabled: undefined }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
index 9c592ba9e9..3153ee3136 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserPersistence.ts
@@ -23,12 +23,21 @@ export interface BrowserTabState {
   readonly failure: BrowserFailure | undefined
 }
 
-/** @param state - saved navigation. @returns its last selected address, if any. */
+/**
+ * Read the selected address from a saved navigation record.
+ * @param state - saved navigation.
+ * @returns its last selected address, if any.
+ */
 export function currentBrowserTarget(state: BrowserTabState | undefined): BrowserTarget | undefined {
   return state === undefined || state.index < 0 ? undefined : state.entries[state.index]
 }
 
-/** @param target - current address. @param revision - navigation generation. @returns an address-only checkpoint. */
+/**
+ * Checkpoint an observed address without serializing native history.
+ * @param target - current address.
+ * @param revision - navigation generation.
+ * @returns an address-only checkpoint.
+ */
 export function browserAddressCheckpoint(target: BrowserTarget, revision: number): BrowserTabState {
   return { entries: [target], index: 0, request: { target, revision },
     navigation: { status: 'known', revision }, failure: undefined }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
index b4cf8989fa..da61877673 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -22,14 +22,20 @@ export class IframeImpl implements BrowserFrame {
     this.store = createSnapshotStore({ ...emptyBrowserFrame(), sandboxEnabled: this.sandboxed })
   }
 
-  /** @param revision - document generation whose iframe emitted load. */
+  /**
+   * Record a controlled load or a later navigation to an unreadable address.
+   * @param revision - document generation whose iframe emitted load.
+   */
   handleLoaded(revision: number): void {
     if (this.disposed) return
     this.navigation.frameLoaded(revision)
     this.publish()
   }
 
-  /** @param revision - document generation whose iframe reported failure. */
+  /**
+   * Publish a failure only for the current document generation.
+   * @param revision - document generation whose iframe reported failure.
+   */
   handleLoadFailed(revision: number): void {
     if (this.disposed || this.navigation.snapshot.request?.revision !== revision) return
     this.error = { code: undefined, description: undefined }
diff --git a/packages/client/ui-sidebar-browser/src/client/pages.ts b/packages/client/ui-sidebar-browser/src/client/pages.ts
index 36fd9033fb..5f0df3d76a 100644
--- a/packages/client/ui-sidebar-browser/src/client/pages.ts
+++ b/packages/client/ui-sidebar-browser/src/client/pages.ts
@@ -6,7 +6,11 @@ import { ElectronWebViewImpl } from './browser/ElectronWebViewImpl.ts'
 import { IframePresentation } from './view/IframePresentation.ts'
 import { ElectronWebviewPresentation } from './view/ElectronWebviewPresentation.ts'
 
-/** @param options - saved navigation and callbacks. @returns the Web page's two independent faces. */
+/**
+ * Assemble an idle iframe provider and its DOM presentation.
+ * @param options - saved navigation and callbacks.
+ * @returns the Web page's navigation and presentation objects.
+ */
 export function createIframePage(options: BrowserPageOptions): BrowserPage {
   const presentation = new IframePresentation({
     loaded: revision => { frame.handleLoaded(revision) },
@@ -18,6 +22,7 @@ export function createIframePage(options: BrowserPageOptions): BrowserPage {
 }
 
 /**
+ * Assemble an idle Electron provider; guest creation waits for mounting and navigation.
  * @param options - checkpoint and source-tab callbacks.
  * @param bridge - desktop-only transport.
  * @param workspace - storage account resolver.
diff --git a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
index fc39414d7c..3fe0c68223 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
+++ b/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
@@ -44,7 +44,11 @@ export class ElectronWebviewPresentation implements BrowserPresentation {
     }
   }
 
-  /** @param reservation - main-approved partition and bootstrap lease. @returns a detached, configured webview. */
+  /**
+   * Configure a detached webview for an approved guest reservation.
+   * @param reservation - main-approved partition and bootstrap lease.
+   * @returns a detached, configured webview.
+   */
   createElement(reservation: DesktopBrowserReservation): WebviewElement {
     const element = document.createElement('webview') as WebviewElement
     element.className = css.webview as string
@@ -55,7 +59,11 @@ export class ElectronWebviewPresentation implements BrowserPresentation {
     return element
   }
 
-  /** @param element - configured guest with its navigation listeners already installed. */
+  /**
+   * Attach a prepared guest, removing any previous guest DOM from the container.
+   * @param element - configured guest with its navigation listeners already installed.
+   * @throws when no content container is mounted.
+   */
   present(element: WebviewElement): void {
     if (this.host === undefined) throw new Error('Electron presentation: cannot attach without a content container')
     this.clear()
@@ -63,7 +71,10 @@ export class ElectronWebviewPresentation implements BrowserPresentation {
     this.host.append(element)
   }
 
-  /** @param title - observed document title, also used as the accessible label. */
+  /**
+   * Set the guest element's accessible label.
+   * @param title - observed document title.
+   */
   show(title: string): void {
     this.element?.setAttribute('aria-label', title)
   }
diff --git a/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts b/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
index bbabde3343..fc064f5ca7 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
+++ b/packages/client/ui-sidebar-browser/src/client/view/IframePresentation.ts
@@ -46,7 +46,10 @@ export class IframePresentation implements BrowserPresentation {
     }
   }
 
-  /** @param value - prepared document and event generation. */
+  /**
+   * Retain the prepared document and render it when a container is mounted.
+   * @param value - prepared document and event generation.
+   */
   show(value: IframeDocument): void {
     this.document = value
     this.render()
diff --git a/packages/client/ui-sidebar-right/src/client/session-view.ts b/packages/client/ui-sidebar-right/src/client/session-view.ts
index 369e79cf3d..1a87112cbe 100644
--- a/packages/client/ui-sidebar-right/src/client/session-view.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-view.ts
@@ -11,6 +11,7 @@ declare module '@deepseek-ai/dsh-api-session-controller/client' {
 
 /** Owns its reference until retirement finishes or the Sidebar plugin shuts down. */
 export class SidebarSessionView {
+  /** Session reference released exclusively by this View. */
   readonly reference: SessionReference
   private readonly tabs = new Map<TabId, number>()
   private mounts = 0
@@ -38,7 +39,10 @@ export class SidebarSessionView {
     return this.tabs.size > 0
   }
 
-  /** @returns cleanup for one committed root; the final cleanup releases a retired view. */
+  /**
+   * Keep a retired View's reference until its committed roots finish unmounting.
+   * @returns cleanup to call once for this root; the final cleanup releases a retired View.
+   */
   mount(): () => void {
     this.mounts += 1
     return () => {
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
index 3031f008b0..01c87cdb41 100644
--- a/packages/client/ui-sidebar-right/src/client/session-views.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -15,6 +15,7 @@ export interface SidebarSessionViewSnapshot {
 
 /** Selects and retires views; the Sidebar plugin's injected dependencies own global teardown. */
 export class SidebarSessionViews {
+  /** Selected and retained View targets observed by the root renderer. */
   readonly source = createSnapshotStore<readonly SidebarSessionViewSnapshot[]>([])
   private readonly views = new Map<SessionId, SidebarSessionView>()
   private readonly viewsByReference = new Map<SessionReference, SidebarSessionView>()
@@ -23,7 +24,10 @@ export class SidebarSessionViews {
 
   constructor(private readonly sessions: ISessions) {}
 
-  /** @param sessionId - main selection, or absence; existing retained background views stay bound. */
+  /**
+   * Change the foreground Session while preserving retained background Views.
+   * @param sessionId - main selection, or absence.
+   */
   select(sessionId: SessionId | undefined): void {
     if (this.closed || this.selected === sessionId) return
     this.selected = sessionId
diff --git a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
index 73647081a7..567b0f5781 100644
--- a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
+++ b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
@@ -1801,8 +1801,11 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     registerOptions: [],
     ownerProps: [
       '/** Right column owner share: resolved normal geometry and opening eligibility. */\nexport interface RightbarOwnerProps {\n  /** Resolved normal panel width in px, not the saved preference; zero if it cannot fit. */\n  width: number\n  /** Current frame width in px. */\n  viewportWidth: number\n  /**\n   * Whether a normal right panel can retain 300px beside a 400px center.\n   * Before a narrow opening, includes the space from collapsing the left sidebar.\n   */\n  canShow: boolean\n}',
+      '/** Identity of one open tab; distinct copies of one content share `contentId`, never `TabId`. */\nexport type TabId = Branded<\'TabId\'>',
+    ],
+    ownerPropsReferences: [
+      'Branded',
     ],
-    ownerPropsReferences: [],
     standardProps: [
       'useResource: UseResource',
       'useWorkspaces: SnapshotSelectorHook<WorkspaceSnapshot>',
@@ -2661,7 +2664,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.pane.tab\', () => ctx.slots.register(\n      { name: \'sidebar.right.pane.tab\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:50',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:54',
   },
   {
     key: 'sidebar.right.pane.tab.title',
@@ -2710,7 +2713,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.pane.tab.title\', () => ctx.slots.register(\n      { name: \'sidebar.right.pane.tab.title\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:64',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:68',
   },
   {
     key: 'sidebar.right.tab.document',
@@ -3014,7 +3017,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     occupants: [],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.guide\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.guide\', select: owner => null },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:75',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:79',
   },
   {
     key: 'sidebar.right.tab.guide.entry',
@@ -3060,7 +3063,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.guide.entry\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.guide.entry\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:82',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:86',
   },
   {
     key: 'sidebar.right.tab.menu.item',
@@ -3118,7 +3121,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     occupants: [],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.menu.item\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.menu.item\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:94',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:98',
   },
   {
     key: 'sidebar.settings',

From 0e652514ea8384a2c32729770dcb18f12db262fd Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 02:33:35 +0800
Subject: [PATCH 55/62] fix(browser): declare workspace client injection

---
 packages/client/ui-sidebar-browser/package.json | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/client/ui-sidebar-browser/package.json b/packages/client/ui-sidebar-browser/package.json
index a724fd3b63..94f05df6ed 100644
--- a/packages/client/ui-sidebar-browser/package.json
+++ b/packages/client/ui-sidebar-browser/package.json
@@ -31,6 +31,7 @@
   "dsh": {
     "client": {
       "inject": [
+        "@deepseek-ai/dsh-api-workspace-controller",
         "@deepseek-ai/dsh-client-ui-sidebar-right",
         "@deepseek-ai/dsh-client-ui-session"
       ],

From 94bc5b25b8823665278057bb6796588c86de3156 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 03:13:15 +0800
Subject: [PATCH 56/62] test(desktop): cover webview and sidebar retention
 lifetimes

---
 apps/desktop/src/browser-guests.ts            |   2 +-
 apps/desktop/tests/preload-app.spec.ts        |   3 +-
 .../ui-dockkit/src/components/FloatLayer.tsx  |   4 +-
 .../ui-dockkit/src/components/TabLayout.tsx   |  61 ++--
 .../ui-dockkit/src/components/TabPanel.tsx    | 298 +++++++++---------
 .../tests/tab-layout.client.spec.tsx          | 162 ++++++++++
 .../src/client/browser/BrowserController.ts   |  14 +-
 .../src/client/browser/ElectronWebViewImpl.ts |   9 +-
 .../src/client/browser/IframeImpl.ts          |   2 +-
 .../src/client/browser/workspace.ts           |   7 +-
 .../ui-sidebar-browser/src/client/index.ts    |   2 +-
 .../ui-sidebar-browser/src/client/pages.ts    |   7 +-
 .../src/client/view/BrowserBody.tsx           |   6 +-
 .../tests/browser-body.client.spec.tsx        |  42 +--
 .../tests/electron-frame.client.spec.ts       |   2 +-
 .../tests/electron-harness.client.ts          |  66 ++++
 .../tests/electron-lifecycle.client.spec.ts   | 179 +++++++++++
 .../tests/workspace.client.spec.ts            |  57 ++++
 .../src/client/contract/slots.ts              |  14 +-
 .../src/client/session-view.ts                |   2 +-
 .../src/client/session-views.ts               |   4 +-
 .../src/client/shell/SidebarRight.tsx         |   4 +-
 .../tests/session-views.client.spec.ts        | 114 +++++++
 .../src/client/slot-catalog.ts                |  10 +-
 24 files changed, 831 insertions(+), 240 deletions(-)
 create mode 100644 packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
 create mode 100644 packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
 create mode 100644 packages/client/ui-sidebar-browser/tests/electron-lifecycle.client.spec.ts
 create mode 100644 packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
 create mode 100644 packages/client/ui-sidebar-right/tests/session-views.client.spec.ts

diff --git a/apps/desktop/src/browser-guests.ts b/apps/desktop/src/browser-guests.ts
index d3824dd902..027b7cee5b 100644
--- a/apps/desktop/src/browser-guests.ts
+++ b/apps/desktop/src/browser-guests.ts
@@ -54,7 +54,7 @@ export class DesktopBrowserGuests {
     this.leases.delete(key)
     const guest = lease.guest
     if (guest !== undefined && !guest.isDestroyed()) {
-      const destroyed = new Promise<void>(resolve => { guest.once('destroyed', resolve) })
+      const destroyed = new Promise<void>((resolve) => { guest.once('destroyed', resolve) })
       guest.close({ waitForBeforeUnload: false })
       await destroyed
     }
diff --git a/apps/desktop/tests/preload-app.spec.ts b/apps/desktop/tests/preload-app.spec.ts
index 6e1740fc61..f1652d89ea 100644
--- a/apps/desktop/tests/preload-app.spec.ts
+++ b/apps/desktop/tests/preload-app.spec.ts
@@ -27,7 +27,8 @@ it('limits product documents to update status and a native confirmation action',
   expect(api.updates).not.toHaveProperty('install')
   const listener = vi.fn()
   const dispose = api.updates.subscribe(listener)
-  const handler = electron.ipcRenderer.on.mock.calls.find(([channel]) => channel === DESKTOP_IPC.updatesPresentation)?.[1] as (event: unknown, state: unknown) => void
+  const handler = electron.ipcRenderer.on.mock.calls.find(([channel]) => channel === DESKTOP_IPC.updatesPresentation)?.[1] as
+    (event: unknown, state: unknown) => void
   handler({}, { visible: false })
   expect(listener).toHaveBeenCalledWith({ visible: false })
   dispose()
diff --git a/packages/client/ui-dockkit/src/components/FloatLayer.tsx b/packages/client/ui-dockkit/src/components/FloatLayer.tsx
index 4253880f0b..5f512423bd 100644
--- a/packages/client/ui-dockkit/src/components/FloatLayer.tsx
+++ b/packages/client/ui-dockkit/src/components/FloatLayer.tsx
@@ -124,7 +124,7 @@ export function FloatHeader({ paneId, tab, labels, intents, renderTabTitle, canC
       <div className={css.stripFill} />
       <Tooltip label={labels.dockFloat} side="bottom" delayMs={500}>
         <button type="button" className={css.iconButton} aria-label={labels.dockFloat}
-          data-dockkit-float-dock={paneId} onPointerDown={event => { event.stopPropagation() }}
+          data-dockkit-float-dock={paneId} onPointerDown={(event) => { event.stopPropagation() }}
           onClick={() => { intents.unfloatPane(paneId) }}>
           <IconPanelLeftOutlineRegular className={css.dockGlyph} />
         </button>
@@ -132,7 +132,7 @@ export function FloatHeader({ paneId, tab, labels, intents, renderTabTitle, canC
       {(canCloseTab?.(tab.id) ?? true) && (
         <Tooltip label={labels.closeFloat} side="bottom" delayMs={500}>
           <button type="button" className={css.iconButton} aria-label={labels.closeFloat}
-            data-dockkit-float-close={paneId} onPointerDown={event => { event.stopPropagation() }}
+            data-dockkit-float-close={paneId} onPointerDown={(event) => { event.stopPropagation() }}
             onClick={() => { intents.closeTab(tab.id) }}>
             <IconCloseOutlineRegular />
           </button>
diff --git a/packages/client/ui-dockkit/src/components/TabLayout.tsx b/packages/client/ui-dockkit/src/components/TabLayout.tsx
index c88e206f04..36f37a4ab2 100644
--- a/packages/client/ui-dockkit/src/components/TabLayout.tsx
+++ b/packages/client/ui-dockkit/src/components/TabLayout.tsx
@@ -35,7 +35,8 @@ interface TabHostProps extends LayoutProps {
 }
 
 /** A tab's ancestors stay identical across selection, pane moves and floating. */
-function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRequest, keepMounted, active = true }: TabHostProps): ReactNode {
+function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRequest, keepMounted,
+  active = true }: TabHostProps): ReactNode {
   const floating = pane.host === 'float'
   const selected = floating || pane.activeTabId === tab.id
   const visible = active && selected && (floating || state.expanded)
@@ -77,32 +78,32 @@ function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRe
     <div className={clsx(css.tabCell, floating && css.floatingCell)} hidden={!selected}
       data-dockkit-host={floating ? 'float' : 'dock'} data-dockkit-column={floating ? undefined : column}
       style={{ gridColumn: floating ? 1 : column * 2 + 1, gridRow: 1, order: floating ? depth : 0 }}>
-    <section ref={host} className={clsx(css.tabHost, floating ? css.float : css.pane)}
-      aria-hidden={!visible || undefined}
-      data-dockkit-content={tab.id}
-      data-dockkit-pane={!floating && selected ? pane.id : undefined}
-      data-dockkit-pane-active={!floating && state.activePaneId === pane.id || undefined}
-      data-dockkit-float={floating ? pane.id : undefined}
-      data-dockkit-float-active={floating && state.activePaneId === pane.id || undefined}
-      data-dockkit-column={!floating ? column : undefined}
-      style={rect === undefined ? undefined : {
-        left: rect.x, top: rect.y, width: rect.width, height: rect.height,
-      }}
-      onPointerDown={() => { if (floating) floats.raise(pane.id) }}
-      onClick={() => { if (!floating && state.activePaneId !== pane.id) callbacks.onFocusPane(pane.id) }}>
-      <div className={css.tabHostHeader}>
-        {selected && (floating
-          ? <FloatHeader paneId={pane.id} tab={tab} labels={callbacks.labels} intents={intents}
-            renderTabTitle={callbacks.renderTabTitle} canCloseTab={callbacks.canCloseTab} drag={floats.drag} />
-          : <TabStrip state={state} pane={pane} callbacks={callbacks} />)}
-      </div>
-      <div ref={body} className={clsx(css.tabHostBody, floating ? css.floatBody : css.paneBody)}>
-        {visited && (retained || (active && selected)) ? callbacks.renderTab(tab) : null}
-        {!floating && <PaneDropHints pane={pane} callbacks={callbacks} />}
-      </div>
-      {floating && <div className={css.floatResize} data-dockkit-float-resize={pane.id}
-        onPointerDown={event => { floats.drag('resize', pane.id, event) }} />}
-    </section>
+      <section ref={host} className={clsx(css.tabHost, floating ? css.float : css.pane)}
+        aria-hidden={!visible || undefined}
+        data-dockkit-content={tab.id}
+        data-dockkit-pane={!floating && selected ? pane.id : undefined}
+        data-dockkit-pane-active={!floating && state.activePaneId === pane.id || undefined}
+        data-dockkit-float={floating ? pane.id : undefined}
+        data-dockkit-float-active={floating && state.activePaneId === pane.id || undefined}
+        data-dockkit-column={!floating ? column : undefined}
+        style={rect === undefined ? undefined : {
+          left: rect.x, top: rect.y, width: rect.width, height: rect.height,
+        }}
+        onPointerDown={() => { if (floating) floats.raise(pane.id) }}
+        onClick={() => { if (!floating && state.activePaneId !== pane.id) callbacks.onFocusPane(pane.id) }}>
+        <div className={css.tabHostHeader}>
+          {selected && (floating
+            ? <FloatHeader paneId={pane.id} tab={tab} labels={callbacks.labels} intents={intents}
+              renderTabTitle={callbacks.renderTabTitle} canCloseTab={callbacks.canCloseTab} drag={floats.drag} />
+            : <TabStrip state={state} pane={pane} callbacks={callbacks} />)}
+        </div>
+        <div ref={body} className={clsx(css.tabHostBody, floating ? css.floatBody : css.paneBody)}>
+          {visited && (retained || (active && selected)) ? callbacks.renderTab(tab) : null}
+          {!floating && <PaneDropHints pane={pane} callbacks={callbacks} />}
+        </div>
+        {floating && <div className={css.floatResize} data-dockkit-float-resize={pane.id}
+          onPointerDown={(event) => { floats.drag('resize', pane.id, event) }} />}
+      </section>
     </div>
   )
 }
@@ -118,7 +119,7 @@ export function TabLayout(props: LayoutProps): ReactNode {
   const focusRequest = useRef<{ readonly tabId: TabId; readonly origin: Element | null }>()
   const tabCallbacks: PaneCallbacks = {
     ...callbacks,
-    onFocusTab: tabId => {
+    onFocusTab: (tabId) => {
       // Only changing the selected body replaces its strip; pane-only focus does not.
       focusRequest.current = findTabPane(state, tabId).activeTabId === tabId
         ? undefined : { tabId, origin: document.activeElement }
@@ -137,7 +138,7 @@ export function TabLayout(props: LayoutProps): ReactNode {
     <div className={css.tabLayout} data-dockkit-split={root.kind === 'split' ? root.id : undefined}
       style={{ gridTemplateColumns: columns }}>
       {/* Logical order changes must not make React move a connected webview's ancestor. */}
-      {Object.values(state.tabs).sort((a, b) => a.id.localeCompare(b.id)).map(tab => {
+      {Object.values(state.tabs).sort((a, b) => a.id.localeCompare(b.id)).map((tab) => {
         const pane = findTabPane(state, tab.id)
         return <TabHost key={tab.id} {...props} callbacks={tabCallbacks} tab={tab} pane={pane}
           column={panes.findIndex(candidate => candidate.id === pane.id)} floats={floats} focusRequest={focusRequest} />
@@ -149,7 +150,7 @@ export function TabLayout(props: LayoutProps): ReactNode {
       ))}
       {root.kind === 'split' && <div className={clsx(css.divider, css.tabLayoutDivider)}
         data-dockkit-divider={`${root.id}:0`} style={{ gridColumn: 2, gridRow: 1 }}
-        onPointerDown={event => { callbacks.onDividerPressed(root.id, 0, event) }} />}
+        onPointerDown={(event) => { callbacks.onDividerPressed(root.id, 0, event) }} />}
     </div>
   )
 }
diff --git a/packages/client/ui-dockkit/src/components/TabPanel.tsx b/packages/client/ui-dockkit/src/components/TabPanel.tsx
index 9c31c43fbe..1088e71399 100644
--- a/packages/client/ui-dockkit/src/components/TabPanel.tsx
+++ b/packages/client/ui-dockkit/src/components/TabPanel.tsx
@@ -238,158 +238,158 @@ export function TabStrip({ state, pane, callbacks }: TabPanelProps): ReactNode {
   }
 
   return (
-      <div className={css.tabStrip} role="tablist" data-dockkit-strip={pane.id}>
-        <div ref={stripTabs} className={css.stripTabs} role="presentation" data-dockkit-strip-tabs={pane.id}>
-          {pane.tabs.map((tabId, index) => {
-            const tab = getTab(state, tabId)
-            const selected = tabId === pane.activeTabId
-            const closable = callbacks.canCloseTab(tabId)
-            // A pane's lone unclosable chip is a label, not a choice: there is
-            // no other tab to select against and nothing to do to it.
-            const quiet = !closable && pane.tabs.length === 1
-            return (
-              <Fragment key={tabId}>
-                {(index > 0 || stripIndex === index) && (
-                  <div
-                    className={clsx(css.slot, stripIndex === index && css.slotCaret)}
-                    data-dockkit-caret={stripIndex === index ? index : undefined}
+    <div className={css.tabStrip} role="tablist" data-dockkit-strip={pane.id}>
+      <div ref={stripTabs} className={css.stripTabs} role="presentation" data-dockkit-strip-tabs={pane.id}>
+        {pane.tabs.map((tabId, index) => {
+          const tab = getTab(state, tabId)
+          const selected = tabId === pane.activeTabId
+          const closable = callbacks.canCloseTab(tabId)
+          // A pane's lone unclosable chip is a label, not a choice: there is
+          // no other tab to select against and nothing to do to it.
+          const quiet = !closable && pane.tabs.length === 1
+          return (
+            <Fragment key={tabId}>
+              {(index > 0 || stripIndex === index) && (
+                <div
+                  className={clsx(css.slot, stripIndex === index && css.slotCaret)}
+                  data-dockkit-caret={stripIndex === index ? index : undefined}
+                />
+              )}
+              <div
+                role="tab"
+                aria-selected={selected}
+                tabIndex={selected ? 0 : -1}
+                className={clsx(
+                  css.tab,
+                  selected && css.tabActive,
+                  quiet && css.tabQuiet,
+                  callbacks.draggingTabId === tabId && css.tabDragging,
+                )}
+                data-dockkit-tab={tabId}
+                data-dockkit-tab-quiet={quiet || undefined}
+                ref={(element) => {
+                  if (element === null) chips.delete(tabId)
+                  else chips.set(tabId, element)
+                }}
+                // Focus lands on click, not on press: a state change between
+                // pointerdown and the first pointermove rebuilds this subtree,
+                // and Chromium cancels the pointer when the pressed element is
+                // replaced — which would abandon every drag. A drag that ends
+                // elsewhere fires no click, and its own operation carries focus.
+                onPointerDown={(event) => {
+                  // A secondary press is the menu, never a drag.
+                  if (event.button === 2) return
+                  callbacks.onTabPressed(tabId, event)
+                }}
+                onClick={(event) => {
+                  event.stopPropagation()
+                  activate(tabId)
+                }}
+                onKeyDown={(event) => {
+                  // Keys on the chip's nested close control are that control's.
+                  if (event.target !== event.currentTarget) return
+                  const next = chipToFocus(event.key, pane.tabs, tabId)
+                  if (next !== undefined) {
+                    event.preventDefault()
+                    focusChip(next)
+                    return
+                  }
+                  if (selects(event.key)) {
+                    event.preventDefault()
+                    activate(tabId)
+                  }
+                }}
+                onContextMenu={(event) => {
+                  event.preventDefault()
+                  const anchor = event.currentTarget
+                  setMenu(current => current?.tabId === tabId ? undefined : { tabId, anchor })
+                }}
+              >
+                <TabTitle>{callbacks.renderTabTitle?.(tab) ?? tab.title}</TabTitle>
+                {closable && (
+                  <button
+                    type="button"
+                    className={css.tabClose}
+                    aria-label={callbacks.labels.closeTab}
+                    data-dockkit-tab-close={tabId}
+                    // A nested control stops its own press: otherwise the press
+                    // starts a drag, captures the pointer, and this click never lands.
+                    onPointerDown={(event) => { event.stopPropagation() }}
+                    onClick={(event) => {
+                      event.stopPropagation()
+                      callbacks.onCloseTab(tabId)
+                    }}
+                  >
+                    <IconCloseFillRegular size={14} />
+                  </button>
+                )}
+                {menu?.tabId === tabId && (
+                  <TabMenu
+                    labels={callbacks.labels}
+                    anchor={menu.anchor}
+                    onClose={closable ? () => { setMenu(undefined); callbacks.onCloseTab(tabId) } : undefined}
+                    onDismiss={() => { setMenu(undefined) }}
+                    extras={callbacks.renderTabMenuItems?.(tab, () => { setMenu(undefined) })}
                   />
                 )}
-                <div
-                  role="tab"
-                  aria-selected={selected}
-                  tabIndex={selected ? 0 : -1}
-                  className={clsx(
-                    css.tab,
-                    selected && css.tabActive,
-                    quiet && css.tabQuiet,
-                    callbacks.draggingTabId === tabId && css.tabDragging,
-                  )}
-                  data-dockkit-tab={tabId}
-                  data-dockkit-tab-quiet={quiet || undefined}
-                  ref={(element) => {
-                    if (element === null) chips.delete(tabId)
-                    else chips.set(tabId, element)
-                  }}
-                  // Focus lands on click, not on press: a state change between
-                  // pointerdown and the first pointermove rebuilds this subtree,
-                  // and Chromium cancels the pointer when the pressed element is
-                  // replaced — which would abandon every drag. A drag that ends
-                  // elsewhere fires no click, and its own operation carries focus.
-                  onPointerDown={(event) => {
-                    // A secondary press is the menu, never a drag.
-                    if (event.button === 2) return
-                    callbacks.onTabPressed(tabId, event)
-                  }}
-                  onClick={(event) => {
-                    event.stopPropagation()
-                    activate(tabId)
-                  }}
-                  onKeyDown={(event) => {
-                    // Keys on the chip's nested close control are that control's.
-                    if (event.target !== event.currentTarget) return
-                    const next = chipToFocus(event.key, pane.tabs, tabId)
-                    if (next !== undefined) {
-                      event.preventDefault()
-                      focusChip(next)
-                      return
-                    }
-                    if (selects(event.key)) {
-                      event.preventDefault()
-                      activate(tabId)
-                    }
-                  }}
-                  onContextMenu={(event) => {
-                    event.preventDefault()
-                    const anchor = event.currentTarget
-                    setMenu(current => current?.tabId === tabId ? undefined : { tabId, anchor })
-                  }}
-                >
-                  <TabTitle>{callbacks.renderTabTitle?.(tab) ?? tab.title}</TabTitle>
-                  {closable && (
-                    <button
-                      type="button"
-                      className={css.tabClose}
-                      aria-label={callbacks.labels.closeTab}
-                      data-dockkit-tab-close={tabId}
-                      // A nested control stops its own press: otherwise the press
-                      // starts a drag, captures the pointer, and this click never lands.
-                      onPointerDown={(event) => { event.stopPropagation() }}
-                      onClick={(event) => {
-                        event.stopPropagation()
-                        callbacks.onCloseTab(tabId)
-                      }}
-                    >
-                      <IconCloseFillRegular size={14} />
-                    </button>
-                  )}
-                  {menu?.tabId === tabId && (
-                    <TabMenu
-                      labels={callbacks.labels}
-                      anchor={menu.anchor}
-                      onClose={closable ? () => { setMenu(undefined); callbacks.onCloseTab(tabId) } : undefined}
-                      onDismiss={() => { setMenu(undefined) }}
-                      extras={callbacks.renderTabMenuItems?.(tab, () => { setMenu(undefined) })}
-                    />
-                  )}
-                </div>
-              </Fragment>
-            )
-          })}
-          {stripIndex === pane.tabs.length && <div className={clsx(css.slot, css.slotCaret)} data-dockkit-caret={stripIndex} />}
-        </div>
-        {callbacks.canAddTab(pane.id) && (
-          <Tooltip label={callbacks.labels.addTab} side="bottom" delayMs={500}>
-            <button
-              type="button"
-              className={css.addTab}
-              aria-label={callbacks.labels.addTab}
-              data-dockkit-add-tab={pane.id}
-              onClick={(event) => {
-                event.stopPropagation()
-                callbacks.onAddTab(pane.id)
-              }}
-            >
-              <IconPlusOutlineRegular size={14} />
-            </button>
-          </Tooltip>
-        )}
-        <div className={css.stripFill} data-dockkit-strip-fill />
-        {!(callbacks.hideSplitWhenBlocked && block !== undefined) && (
-          <Tooltip label={callbacks.labels.splitPane} side="bottom" delayMs={500} disabled={block !== undefined}>
-            <button
-              type="button"
-              className={css.iconButton}
-              aria-label={callbacks.labels.splitPane}
-              // Disabled buttons fire no hover events, so the blocked reason
-              // stays a native title.
-              title={block === undefined ? undefined : splitBlockedTitle(callbacks.labels, block)}
-              disabled={block !== undefined}
-              data-dockkit-split-button={pane.id}
-              data-dockkit-split-blocked={block}
-              onClick={(event) => {
-                event.stopPropagation()
-                callbacks.onSplitPane(pane.id)
-              }}
-            >
-              <SplitGlyph />
-            </button>
-          </Tooltip>
-        )}
-        {/* The embedder's surface-wide controls, in the top-right pane only: the
-            strip is the surface's top edge, and this pane's end is its corner. */}
-        {pane.id === callbacks.chromePaneId && callbacks.chrome !== undefined && (
-          // The embedder's controls report their own intents; the pane's
-          // click-to-focus must not add a focus entry to each of them.
-          <div
-            className={css.stripChrome}
-            data-dockkit-strip-chrome
-            onClick={(event) => { event.stopPropagation() }}
-          >
-            {callbacks.chrome}
-          </div>
-        )}
+              </div>
+            </Fragment>
+          )
+        })}
+        {stripIndex === pane.tabs.length && <div className={clsx(css.slot, css.slotCaret)} data-dockkit-caret={stripIndex} />}
       </div>
+      {callbacks.canAddTab(pane.id) && (
+        <Tooltip label={callbacks.labels.addTab} side="bottom" delayMs={500}>
+          <button
+            type="button"
+            className={css.addTab}
+            aria-label={callbacks.labels.addTab}
+            data-dockkit-add-tab={pane.id}
+            onClick={(event) => {
+              event.stopPropagation()
+              callbacks.onAddTab(pane.id)
+            }}
+          >
+            <IconPlusOutlineRegular size={14} />
+          </button>
+        </Tooltip>
+      )}
+      <div className={css.stripFill} data-dockkit-strip-fill />
+      {!(callbacks.hideSplitWhenBlocked && block !== undefined) && (
+        <Tooltip label={callbacks.labels.splitPane} side="bottom" delayMs={500} disabled={block !== undefined}>
+          <button
+            type="button"
+            className={css.iconButton}
+            aria-label={callbacks.labels.splitPane}
+            // Disabled buttons fire no hover events, so the blocked reason
+            // stays a native title.
+            title={block === undefined ? undefined : splitBlockedTitle(callbacks.labels, block)}
+            disabled={block !== undefined}
+            data-dockkit-split-button={pane.id}
+            data-dockkit-split-blocked={block}
+            onClick={(event) => {
+              event.stopPropagation()
+              callbacks.onSplitPane(pane.id)
+            }}
+          >
+            <SplitGlyph />
+          </button>
+        </Tooltip>
+      )}
+      {/* The embedder's surface-wide controls, in the top-right pane only: the
+            strip is the surface's top edge, and this pane's end is its corner. */}
+      {pane.id === callbacks.chromePaneId && callbacks.chrome !== undefined && (
+      // The embedder's controls report their own intents; the pane's
+      // click-to-focus must not add a focus entry to each of them.
+        <div
+          className={css.stripChrome}
+          data-dockkit-strip-chrome
+          onClick={(event) => { event.stopPropagation() }}
+        >
+          {callbacks.chrome}
+        </div>
+      )}
+    </div>
   )
 }
 
diff --git a/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
new file mode 100644
index 0000000000..7874de6c37
--- /dev/null
+++ b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
@@ -0,0 +1,162 @@
+// @vitest-environment jsdom
+import { afterEach, expect, it, vi } from 'vitest'
+import { act, cleanup, fireEvent, render } from '@testing-library/react'
+import type { ComponentProps } from 'react'
+import { TabLayout } from '../src/components/TabLayout.tsx'
+import { DockController } from '../src/engine/controller.ts'
+import { getNode, getPane } from '../src/engine/tree.ts'
+import type { PaneCallbacks } from '../src/components/render.ts'
+import type { TabId } from '../src/contract/types.ts'
+import { followPointer } from '../src/components/pointer.ts'
+import { seededController, TEST_LABELS } from './fixtures.client.ts'
+
+afterEach(() => { cleanup(); vi.restoreAllMocks() })
+
+function mounted(controller = seededController(), options: Partial<ComponentProps<typeof TabLayout>> = {}) {
+  const callbacks: PaneCallbacks = {
+    onFocusTab: (id) => { controller.focusTab(id); redraw() },
+    onFocusPane: (id) => { controller.focusPane(id); redraw() },
+    onSplitPane: vi.fn(), onAddTab: vi.fn(), onCloseTab: vi.fn(), onTabPressed: vi.fn(), onDividerPressed: vi.fn(),
+    splitBlock: () => undefined, canAddTab: () => true, canCloseTab: () => true,
+    dropTarget: undefined, draggingTabId: undefined, labels: TEST_LABELS,
+    renderTab: tab => <input data-body={tab.id} defaultValue={tab.title} />,
+    renderTabTitle: undefined, renderTabMenuItems: undefined,
+    chromePaneId: getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).id,
+    chrome: undefined,
+  }
+  const props = () => ({ state: controller.getSnapshot().state, callbacks, intents: controller, preview: undefined, ...options })
+  const view = render(<TabLayout {...props()} />)
+  function redraw(next: typeof options = {}) {
+    options = { ...options, ...next }
+    view.rerender(<TabLayout {...props()} />)
+  }
+  const node = (selector: string): HTMLElement => {
+    const element = view.container.querySelector<HTMLElement>(selector)
+    if (element === null) throw new Error(`missing ${selector}`)
+    return element
+  }
+  return { controller, view, redraw, callbacks, node, body: (id: TabId) => node(`[data-body="${id}"]`) }
+}
+
+it('retains visited bodies and hands keyboard focus to the newly selected strip', () => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller, { keepMounted: () => true })
+  const original = h.body(first)
+  expect(h.view.container.querySelector(`[data-body="${second}"]`)).toBeNull()
+  const chip = h.node(`[data-dockkit-tab="${second}"]`)
+  chip.focus()
+  fireEvent.click(chip)
+  expect(document.activeElement).toBe(h.node(`[data-dockkit-content="${second}"] [data-dockkit-tab="${second}"]`))
+  expect(h.body(first)).toBe(original)
+  expect(original.closest('[data-dockkit-host]')).toHaveProperty('hidden', true)
+  fireEvent.click(h.node(`[data-dockkit-content="${second}"] [data-dockkit-tab="${second}"]`))
+  const body = h.body(second)
+  body.focus()
+  h.redraw({ active: false })
+  expect(body.closest('[data-dockkit-content]')).toHaveProperty('inert', true)
+  expect(document.activeElement).not.toBe(body)
+  fireEvent.focus(body)
+  h.redraw({ active: true })
+  expect(h.body(second)).toBe(body)
+  expect(body.closest('[data-dockkit-content]')).toHaveProperty('inert', false)
+  act(() => { controller.setExpanded(false); h.redraw() })
+  expect(h.body(second)).toBe(body)
+})
+
+it('keeps body ancestors through pane moves, floating, raising and docking', () => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const tab = controller.openContent({ kind: 'file', contentId: 'file:a', title: 'A' })
+  const h = mounted(controller, { keepMounted: () => true })
+  const body = h.body(tab)
+  const host = body.closest('[data-dockkit-host]')!
+  act(() => { controller.splitPane(); h.redraw() })
+  expect(h.view.container.querySelectorAll('[data-dockkit-pane]')).toHaveLength(2)
+  const state = controller.getSnapshot().state
+  const split = getNode(state, state.rootId)
+  if (split.kind !== 'split') throw new Error('expected a split')
+  h.redraw({ preview: { splitId: split.id, sizes: [0.3, 0.7] } })
+  expect(h.node('[data-dockkit-split]').style.gridTemplateColumns).toContain('0.3fr')
+  fireEvent.pointerDown(h.node('[data-dockkit-divider]'), { button: 0, pointerId: 1 })
+  expect(h.callbacks.onDividerPressed).toHaveBeenCalledOnce()
+  h.redraw({ preview: undefined })
+  fireEvent.focus(body)
+  expect(controller.getSnapshot().state.activePaneId).toBe(getPane(state, split.children[0]!).id)
+  const secondPane = getPane(state, split.children[1]!).id
+  act(() => { controller.placeTab(tab, secondPane, 0); h.redraw() })
+  expect(h.body(tab)).toBe(body)
+  expect(body.closest('[data-dockkit-host]')).toBe(host)
+  act(() => { controller.floatTab(tab); h.redraw() })
+  const floating = controller.getSnapshot().state.floats[0]!
+  expect(body.closest('[data-dockkit-host]')).toBe(host)
+  expect(host.getAttribute('data-dockkit-host')).toBe('float')
+  act(() => { controller.setExpanded(false); h.redraw() })
+  expect(body.closest('[data-dockkit-content]')?.getAttribute('aria-hidden')).toBeNull()
+  fireEvent.pointerDown(h.node(`[data-dockkit-float="${floating}"]`), { pointerId: 1, button: 0 })
+  fireEvent.focus(body)
+  const resize = h.node('[data-dockkit-float-resize]')
+  fireEvent.pointerDown(resize, { pointerId: 2, button: 0, clientX: 500, clientY: 400 })
+  fireEvent.pointerMove(window, { pointerId: 2, clientX: 540, clientY: 440 })
+  fireEvent.pointerUp(window, { pointerId: 2, clientX: 540, clientY: 440 })
+  act(() => { h.redraw(); controller.unfloatPane(floating); h.redraw() })
+  expect(h.body(tab)).toBe(body)
+  expect(body.closest('[data-dockkit-host]')).toBe(host)
+})
+
+it('unmounts unretained bodies and restores focus to their replacement strip', () => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller)
+  const original = h.body(first)
+  fireEvent.click(h.node(`[data-dockkit-tab="${second}"]`))
+  expect(original.isConnected).toBe(false)
+  h.redraw({ active: false })
+  expect(h.view.container.querySelector('[data-body]')).toBeNull()
+  h.redraw({ active: true })
+  const focus = vi.spyOn(HTMLElement.prototype, 'focus')
+  fireEvent.click(h.node(`[data-dockkit-tab="${first}"]`))
+  expect(focus).toHaveBeenCalled()
+})
+
+it('renders an empty pane and rejects unsupported docked trees', () => {
+  const controller = new DockController()
+  controller.setExpanded(true)
+  const h = mounted(controller)
+  expect(h.node('[data-dockkit-empty]')).toBeDefined()
+  controller.openContent({ kind: 'file', contentId: 'file:a', title: 'A' })
+  controller.splitPane()
+  const state = controller.getSnapshot().state
+  const root = getNode(state, state.rootId)
+  if (root.kind !== 'split') throw new Error('expected a split')
+  vi.spyOn(console, 'error').mockImplementation(() => {})
+  const suppress = (event: ErrorEvent): void => {
+    if (event.error instanceof Error && event.error.message === 'DockLayout requires one pane or two horizontally split panes') {
+      event.preventDefault()
+    }
+  }
+  window.addEventListener('error', suppress)
+  try {
+    expect(() =>{  h.redraw({ state: { ...state, nodes: { ...state.nodes, [root.id]: { ...root, axis: 'column' } } } }) })
+      .toThrow('two horizontally split panes')
+  } finally {
+    window.removeEventListener('error', suppress)
+  }
+})
+
+it('keeps a superseding gesture marker when an older follower detaches', () => {
+  const element = document.createElement('div')
+  const followers = { move: vi.fn(), up: vi.fn(), cancel: vi.fn() }
+  const first = followPointer(element, 1, followers)
+  const second = followPointer(element, 2, followers)
+  first()
+  expect(element.dataset.dockkitPointer).toBe('2')
+  second()
+  expect(element.dataset.dockkitPointer).toBeUndefined()
+})
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index 6911f88a56..521bd0d761 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -46,12 +46,12 @@ export class BrowserController implements HostObservable<BrowserControllerState>
     this.checkpoint = options.initial
     this.page = options.createPage({
       initial: options.initial,
-      persist: state => {
+      persist: (state) => {
         if (this.disposed) return
         this.checkpoint = state
         this.actions.replace(options.tabId, state)
       },
-      openRequested: value => {
+      openRequested: (value) => {
         if (this.disposed) return
         const result = parseBrowserAddress(value, options.applicationOrigin)
         if (!result.ok) { this.addressFailed(result.reason); return }
@@ -254,15 +254,15 @@ export function createBrowserControllers(actions: BoundActions<BrowserStore>, cr
       controllers.clear()
       await Promise.all(pending)
     },
-    rebind: actions => {
+    rebind: (actions) => {
       currentActions = actions
       for (const { controller } of controllers.values()) controller.rebind(actions)
     },
     loadUrl: (id, value) => { controller(id)?.loadUrl(value) },
-    restore: id => { controller(id)?.restore() },
-    goBack: id => { controller(id)?.goBack() },
-    goForward: id => { controller(id)?.goForward() },
-    reload: id => { controller(id)?.reload() },
+    restore: (id) => { controller(id)?.restore() },
+    goBack: (id) => { controller(id)?.goBack() },
+    goForward: (id) => { controller(id)?.goForward() },
+    reload: (id) => { controller(id)?.reload() },
     setSandbox: (id, enabled) => { controller(id)?.setSandbox(enabled) },
   }
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
index 5307b7d8d2..79c075aaaf 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
@@ -145,13 +145,14 @@ export class ElectronWebViewImpl implements BrowserFrame {
     this.workspaceKey ??= await this.workspace(attachmentSignal)
     if (attachmentSignal.aborted) return
     const reservation = await this.bridge.acquire(this.workspaceKey)
+    // oxlint-disable-next-line typescript/no-unnecessary-condition -- The signal can abort while acquire is pending.
     if (attachmentSignal.aborted) { await this.release(reservation.lease); return }
     this.lease = reservation.lease
     this.guestLifetime = new AbortController()
     const signal = AbortSignal.any([attachmentSignal, this.guestLifetime.signal])
     const element = this.presentation.createElement(reservation)
     this.element = element
-    const unsubscribeOpen = this.bridge.onOpenRequested(reservation.lease, url => {
+    const unsubscribeOpen = this.bridge.onOpenRequested(reservation.lease, (url) => {
       if (this.element === element && !signal.aborted) this.options.openRequested(url)
     })
     signal.addEventListener('abort', unsubscribeOpen, { once: true })
@@ -161,10 +162,10 @@ export class ElectronWebViewImpl implements BrowserFrame {
       this.loadPending()
     }, { signal })
     element.addEventListener('did-navigate', () => { this.observe(true) }, { signal })
-    element.addEventListener('did-navigate-in-page', event => {
+    element.addEventListener('did-navigate-in-page', (event) => {
       if ((event as NavigationEvent).isMainFrame) this.observe(true)
     }, { signal })
-    element.addEventListener('did-start-navigation', event => {
+    element.addEventListener('did-start-navigation', (event) => {
       if ((event as NavigationEvent).isMainFrame) {
         this.store.set({ ...this.store.getSnapshot(), loading: true, error: undefined })
       }
@@ -174,7 +175,7 @@ export class ElectronWebViewImpl implements BrowserFrame {
         this.observe(name === 'page-title-updated' && this.store.getSnapshot().address === 'observed')
       }, { signal })
     }
-    element.addEventListener('did-fail-load', event => {
+    element.addEventListener('did-fail-load', (event) => {
       const failure = event as LoadFailureEvent
       if (failure.isMainFrame && failure.errorCode !== -3) {
         this.failed({ code: failure.errorCode, description: failure.errorDescription })
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
index da61877673..2de462ef1e 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -8,7 +8,7 @@ import type { BrowserTarget } from './url.ts'
 
 /** Owns iframe navigation; the view reports loads without reading cross-origin content. */
 export class IframeImpl implements BrowserFrame {
-  readonly sandbox: BrowserSandboxControl = { setEnabled: enabled => { this.setSandbox(enabled) } }
+  readonly sandbox: BrowserSandboxControl = { setEnabled: (enabled) => { this.setSandbox(enabled) } }
   private readonly navigation: BrowserNavigation
   private readonly store: SnapshotStore<BrowserFrameState>
   private sandboxed = true
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
index 0341de1c92..9298529a33 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
@@ -12,7 +12,12 @@ export async function browserWorkspace(source: WorkspaceSource, sessionId: strin
   signal.throwIfAborted()
   if (source.getSnapshot().phase !== 'ready') {
     await new Promise<void>((resolve, reject) => {
-      const abort = (): void => { stop(); reject(signal.reason) }
+      const abort = (): void => {
+        stop()
+        const reason: unknown = signal.reason
+        // oxlint-disable-next-line typescript/prefer-promise-reject-errors -- Preserve the caller-owned AbortSignal reason.
+        reject(reason)
+      }
       const stop = source.subscribe(() => {
         if (source.getSnapshot().phase !== 'ready') return
         stop()
diff --git a/packages/client/ui-sidebar-browser/src/client/index.ts b/packages/client/ui-sidebar-browser/src/client/index.ts
index bc1be9ae18..af5eab39cc 100644
--- a/packages/client/ui-sidebar-browser/src/client/index.ts
+++ b/packages/client/ui-sidebar-browser/src/client/index.ts
@@ -72,7 +72,7 @@ export function apply(ctx: Context): void {
     }, BrowserBody)), 'ui-sidebar-browser.body')
   }
   if (desktop === undefined) installFrames(ctx, () => createIframePage)
-  else ctx.inject(['workspaces'], scope => {
+  else ctx.inject(['workspaces'], (scope) => {
     installFrames(scope, sessionId => options => createElectronPage(options, desktop,
       signal => browserWorkspace(scope.workspaces.list, sessionId, signal)))
   })
diff --git a/packages/client/ui-sidebar-browser/src/client/pages.ts b/packages/client/ui-sidebar-browser/src/client/pages.ts
index 5f0df3d76a..b3ec7ef9c5 100644
--- a/packages/client/ui-sidebar-browser/src/client/pages.ts
+++ b/packages/client/ui-sidebar-browser/src/client/pages.ts
@@ -13,8 +13,8 @@ import { ElectronWebviewPresentation } from './view/ElectronWebviewPresentation.
  */
 export function createIframePage(options: BrowserPageOptions): BrowserPage {
   const presentation = new IframePresentation({
-    loaded: revision => { frame.handleLoaded(revision) },
-    failed: revision => { frame.handleLoadFailed(revision) },
+    loaded: (revision) => { frame.handleLoaded(revision) },
+    failed: (revision) => { frame.handleLoadFailed(revision) },
     remounted: () => { frame.reload() },
   })
   const frame = new IframeImpl(options, presentation)
@@ -30,11 +30,10 @@ export function createIframePage(options: BrowserPageOptions): BrowserPage {
  */
 export function createElectronPage(options: BrowserPageOptions, bridge: DesktopBrowserBridge,
   workspace: (signal: AbortSignal) => Promise<string>): BrowserPage {
-  let frame: ElectronWebViewImpl
   const presentation = new ElectronWebviewPresentation({
     mounted: () => { frame.attach() },
     unmounted: () => { frame.detach() },
   })
-  frame = new ElectronWebViewImpl(options, bridge, workspace, presentation)
+  const frame = new ElectronWebViewImpl(options, bridge, workspace, presentation)
   return { frame, presentation }
 }
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
index 7c2e4462f5..9ea53f03eb 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
@@ -40,7 +40,7 @@ export type BrowserBodyProps = PropsRuntime<'sidebar.right.pane.tab'>
 function useBrowserDraft(url: string | undefined, revision: number): readonly [string, (value: string) => void] {
   const [edit, setEdit] = useState<{ readonly revision: number; readonly value: string }>()
   return [edit?.revision === revision ? edit.value : url ?? '',
-    value => { setEdit({ revision, value }) }]
+    (value) => { setEdit({ revision, value }) }]
 }
 
 /** Render provider-neutral navigation state and optional controls. */
@@ -62,7 +62,7 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
     const hide = mount({
       tabId: tab.id, signal: tab.signal, viewportId, applicationOrigin: window.location.origin,
       initial: initial.current, initialUrl: initialUrl.current,
-      openTab: url => { tab.actions.openTab('browser', { params: { url }, revealIfOpened: false }) },
+      openTab: (url) => { tab.actions.openTab('browser', { params: { url }, revealIfOpened: false }) },
     })
     setMountEpoch(value => value + 1)
     return hide
@@ -88,7 +88,7 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
             aria-label={t('address.placeholder')}
             placeholder={t('address.placeholder')}
             spellCheck={false}
-            onChange={event => { setDraft(event.currentTarget.value) }}
+            onChange={(event) => { setDraft(event.currentTarget.value) }}
           />
           {unknown && <span className={css.addressChanged}>{t('address.changed')}</span>}
           <button type="submit" className={[css.tool, css.addressGo].join(' ')} aria-label={t('go')} title={t('go')}><IconLinkOutlineRegular /></button>
diff --git a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
index 952b8cd4f7..a062a29a15 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
+++ b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
@@ -43,28 +43,28 @@ function mountBrowser(navigation?: { readonly url?: string }) {
   const tabActions = { openResource: vi.fn(), openTab: vi.fn(), close: vi.fn() }
   const props: Pick<BrowserBodyProps, 'sessionId' | 'useTabInfo' | 'useStore' | 'actions' | 't' | 'useBrowserState'>
     & Omit<BrowserInjected, 'keyedHooks'> = {
-    sessionId: SESSION,
-    useTabInfo: () => ({
-      sidebar: { expanded: true, fullscreen: false }, panel: { id: 'pane' as PaneId },
-      tab: {
-        id: TAB, kind: 'browser', title: 'Browser', contentId: 'sidebar://browser/1', visible: true,
-        navigation: { address: 'sidebar://browser/1', params: navigation, revision: 0 },
-        signal: lifetime.signal,
-        actions: tabActions,
+      sessionId: SESSION,
+      useTabInfo: () => ({
+        sidebar: { expanded: true, fullscreen: false }, panel: { id: 'pane' as PaneId },
+        tab: {
+          id: TAB, kind: 'browser', title: 'Browser', contentId: 'sidebar://browser/1', visible: true,
+          navigation: { address: 'sidebar://browser/1', params: navigation, revision: 0 },
+          signal: lifetime.signal,
+          actions: tabActions,
+        },
+      }),
+      useStore: hookOf(store),
+      actions: store.actions,
+      t: (key, params) => {
+        const template = messages[key] ?? key
+        return params === undefined ? template : template.replace(/\{(\w+)\}/g, (_match, name: string) => String(params[name]))
       },
-    }),
-    useStore: hookOf(store),
-    actions: store.actions,
-    t: (key, params) => {
-      const template = messages[key] ?? key
-      return params === undefined ? template : template.replace(/\{(\w+)\}/g, (_match, name: string) => String(params[name]))
-    },
-    ...commands,
-    useBrowserState: (key: string) => {
-      const state = keyedHooks.browserState(key) ?? absentState
-      return useSyncExternalStore(state.subscribe, state.getSnapshot)
-    },
-  }
+      ...commands,
+      useBrowserState: (key: string) => {
+        const state = keyedHooks.browserState(key) ?? absentState
+        return useSyncExternalStore(state.subscribe, state.getSnapshot)
+      },
+    }
   const renderBody = () => render(<BrowserBody {...props as BrowserBodyProps} />)
   return {
     view: renderBody(), remount: renderBody, store, lifetime, injected,
diff --git a/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
index 75b6cf3d09..53a54ea551 100644
--- a/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
@@ -16,7 +16,7 @@ it('clears a failed load when the main page retries without a toolbar command',
     acquire: vi.fn(async () => ({ lease: 'lease' as DesktopBrowserLeaseId, partition: 'partition' })),
     release: vi.fn(async () => {}), onOpenRequested: () => () => {},
   }
-  const presentation = new ElectronWebviewPresentation({ mounted: () => frame.attach(), unmounted: () => frame.detach() })
+  const presentation = new ElectronWebviewPresentation({ mounted: () =>{  frame.attach() }, unmounted: () =>{  frame.detach() } })
   const frame = new ElectronWebViewImpl({ initial: undefined, persist: vi.fn(), openRequested: vi.fn() },
     bridge, async () => 'cwd:/workspace', presentation)
   const createElement = vi.spyOn(presentation, 'createElement').mockReturnValue(element)
diff --git a/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts b/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
new file mode 100644
index 0000000000..31a8f521d5
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
@@ -0,0 +1,66 @@
+/** Native webview events controlled by each test; presentation and navigation stay real. */
+import { vi } from 'vitest'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId, DesktopBrowserReservation } from '../src/types.ts'
+import type { BrowserTabState } from '../src/client/browser/BrowserPersistence.ts'
+import { createElectronPage } from '../src/client/pages.ts'
+import { ElectronWebviewPresentation } from '../src/client/view/ElectronWebviewPresentation.ts'
+
+let sequence = 0
+
+/** @returns one isolated, explicitly mounted page with native operations replaced by spies. */
+export function electronFixture(initial?: BrowserTabState) {
+  const opens = new Set<(url: string) => void>()
+  const reservation: DesktopBrowserReservation = { lease: `lease-${++sequence}` as DesktopBrowserLeaseId, partition: 'partition' }
+  const bridge = {
+    acquire: vi.fn(async (_workspace: string) => reservation),
+    release: vi.fn(async (_lease: DesktopBrowserLeaseId) => {}),
+    onOpenRequested: vi.fn((_lease: DesktopBrowserLeaseId, listener: (url: string) => void) => {
+      opens.add(listener)
+      return () => { opens.delete(listener) }
+    }),
+  } satisfies DesktopBrowserBridge
+  const workspace = vi.fn(async (_signal: AbortSignal) => 'cwd:/workspace')
+  const persist = vi.fn()
+  const openRequested = vi.fn()
+  const page = createElectronPage({ initial, persist, openRequested }, bridge, workspace)
+  const presentation = page.presentation
+  if (!(presentation instanceof ElectronWebviewPresentation)) throw new Error('expected the Electron presentation')
+  const create = presentation.createElement.bind(presentation)
+  const guests: ReturnType<typeof prepareGuest>[] = []
+  function prepareGuest(approved: DesktopBrowserReservation) {
+    const element = create(approved)
+    const state = { url: 'about:blank', title: '', loading: true, back: false, forward: false }
+    const methods = {
+      loadURL: vi.fn(async (_url: string) => {}), getURL: vi.fn(() => state.url), getTitle: vi.fn(() => state.title),
+      canGoBack: () => state.back, canGoForward: () => state.forward, clearHistory: vi.fn(),
+      goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), isLoading: () => state.loading,
+    }
+    Object.assign(element, methods)
+    const emit = (type: string, fields: object = {}): void => { element.dispatchEvent(Object.assign(new Event(type), fields)) }
+    return { element, state, emit, ...methods }
+  }
+  const createElement = vi.spyOn(presentation, 'createElement').mockImplementation((approved) => {
+    const guest = prepareGuest(approved)
+    guests.push(guest)
+    return guest.element
+  })
+  const host = document.createElement('div')
+  host.id = `electron-fixture-${sequence}`
+  document.body.append(host)
+  return {
+    ...page, presentation, bridge, workspace, persist, openRequested, opens, guests, host, reservation,
+    mount: () => presentation.mount(host.id),
+    async guest() {
+      await vi.waitFor(() => { expectGuest() })
+      return guests.at(-1)!
+    },
+    async dispose() {
+      await page.frame.dispose()
+      createElement.mockRestore()
+      host.remove()
+    },
+  }
+  function expectGuest(): void {
+    if (host.firstElementChild === null || guests.length === 0) throw new Error('guest has not attached')
+  }
+}
diff --git a/packages/client/ui-sidebar-browser/tests/electron-lifecycle.client.spec.ts b/packages/client/ui-sidebar-browser/tests/electron-lifecycle.client.spec.ts
new file mode 100644
index 0000000000..ef14e6de07
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tests/electron-lifecycle.client.spec.ts
@@ -0,0 +1,179 @@
+// @vitest-environment jsdom
+import { afterEach, expect, it, vi } from 'vitest'
+import type { DesktopBrowserReservation } from '../src/types.ts'
+import { electronFixture } from './electron-harness.client.ts'
+
+const target = { kind: 'https' as const, url: 'https://example.test/', title: 'Example' }
+const fixtures: ReturnType<typeof electronFixture>[] = []
+function fixture() {
+  const h = electronFixture()
+  fixtures.push(h)
+  return h
+}
+afterEach(async () => {
+  for (const h of fixtures.splice(0)) await h.dispose()
+  vi.restoreAllMocks()
+})
+
+it('waits for a mounted container and observes native history, titles and new-tab requests', async () => {
+  const h = fixture()
+  h.frame.goBack()
+  h.frame.goForward()
+  h.frame.reload()
+  h.frame.loadUrl(target)
+  expect(h.bridge.acquire).not.toHaveBeenCalled()
+  h.mount()
+  const guest = await h.guest()
+  expect(guest.element.getAttribute('partition')).toBe(h.reservation.partition)
+  expect(guest.element.getAttribute('src')).toBe(`about:blank#${h.reservation.lease}`)
+  guest.emit('dom-ready')
+  expect(guest.loadURL).toHaveBeenCalledWith(target.url)
+  guest.state.url = target.url
+  guest.state.title = 'Title'
+  guest.state.back = true
+  guest.state.forward = true
+  guest.emit('did-navigate')
+  expect(guest.clearHistory).toHaveBeenCalledOnce()
+  expect(h.frame.getSnapshot()).toMatchObject({ address: 'observed', target: { ...target, title: 'Title' } })
+  expect(guest.element.getAttribute('aria-label')).toBe('Title')
+  const writes = h.persist.mock.calls.length
+  guest.emit('page-title-updated')
+  expect(h.persist).toHaveBeenCalledTimes(writes)
+  h.frame.loadUrl(target)
+  h.frame.goBack()
+  h.frame.goForward()
+  expect(guest.reload).toHaveBeenCalledOnce()
+  expect(guest.goBack).toHaveBeenCalledOnce()
+  expect(guest.goForward).toHaveBeenCalledOnce()
+  guest.state.url = `${target.url}next`
+  guest.emit('did-navigate-in-page', { isMainFrame: false })
+  expect(h.frame.getSnapshot().target?.url).toBe(target.url)
+  guest.emit('did-navigate-in-page', { isMainFrame: true })
+  guest.state.title = ''
+  guest.state.loading = false
+  guest.emit('page-title-updated')
+  guest.emit('did-stop-loading')
+  expect(h.frame.getSnapshot()).toMatchObject({ loading: false, target: { url: guest.state.url, title: 'example.test' } })
+  const open = h.bridge.onOpenRequested.mock.calls[0]![1]
+  open('https://new.example/')
+  expect(h.openRequested).toHaveBeenCalledOnce()
+  await h.frame.dispose()
+  open('https://late.example/')
+  guest.emit('did-navigate')
+  h.frame.loadUrl(target)
+  h.frame.reload()
+  h.frame.goBack()
+  expect(h.openRequested).toHaveBeenCalledOnce()
+  expect(h.opens.size).toBe(0)
+  expect(h.bridge.release).toHaveBeenCalledExactlyOnceWith(h.reservation.lease)
+})
+
+it('releases an acquisition that finishes after attachment cancellation', async () => {
+  const h = fixture()
+  const pending = Promise.withResolvers<DesktopBrowserReservation>()
+  h.bridge.acquire.mockReturnValueOnce(pending.promise)
+  const unmount = h.mount()
+  h.frame.loadUrl(target)
+  try {
+    await vi.waitFor(() => { expect(h.bridge.acquire).toHaveBeenCalledOnce() })
+    unmount()
+    const disposed = h.frame.dispose()
+    expect(h.frame.dispose()).toBe(disposed)
+    pending.resolve(h.reservation)
+    await disposed
+    expect(h.guests).toHaveLength(0)
+    expect(h.bridge.release).toHaveBeenCalledExactlyOnceWith(h.reservation.lease)
+  } finally {
+    pending.resolve(h.reservation)
+  }
+})
+
+it('does not acquire a guest when Workspace resolution finishes after disposal', async () => {
+  const h = fixture()
+  const pending = Promise.withResolvers<string>()
+  h.workspace.mockReturnValueOnce(pending.promise)
+  h.mount()
+  h.frame.loadUrl(target)
+  try {
+    const disposed = h.frame.dispose()
+    pending.resolve('cwd:/late')
+    await disposed
+    expect(h.bridge.acquire).not.toHaveBeenCalled()
+    h.mount()
+    expect(h.guests).toHaveLength(0)
+  } finally {
+    pending.resolve('cwd:/late')
+  }
+})
+
+it('recreates the guest after physical remount or crash without resolving Workspace again', async () => {
+  const h = fixture()
+  const unmount = h.mount()
+  h.frame.loadUrl(target)
+  const first = await h.guest()
+  first.emit('dom-ready')
+  unmount()
+  h.mount()
+  const second = await h.guest()
+  expect(second.element).not.toBe(first.element)
+  expect(h.workspace).toHaveBeenCalledOnce()
+  second.emit('dom-ready')
+  expect(second.loadURL).toHaveBeenCalledWith(target.url)
+  second.emit('render-process-gone')
+  expect(h.frame.getSnapshot().error).toBeDefined()
+  h.frame.reload()
+  const third = await h.guest()
+  third.emit('dom-ready')
+  expect(third.loadURL).toHaveBeenCalledWith(target.url)
+  expect(h.frame.getSnapshot().error).toBeUndefined()
+  third.emit('destroyed')
+  expect(h.frame.getSnapshot().error).toBeDefined()
+})
+
+it('contains acquisition, native command and release failures and keeps retry available', async () => {
+  const h = fixture()
+  const error = vi.spyOn(console, 'error').mockImplementation(() => {})
+  h.bridge.acquire.mockRejectedValueOnce(new Error('acquire failed'))
+  h.mount()
+  h.frame.loadUrl(target)
+  await vi.waitFor(() => { expect(h.frame.getSnapshot().error).toBeDefined() })
+  h.frame.reload()
+  const guest = await h.guest()
+  guest.emit('dom-ready')
+  guest.state.url = target.url
+  guest.emit('did-navigate')
+  guest.reload.mockImplementationOnce(() => { throw new Error('command failed') })
+  h.frame.reload()
+  expect(h.frame.getSnapshot().error).toBeDefined()
+  h.frame.reload()
+  expect(h.frame.getSnapshot().error).toBeUndefined()
+  guest.getURL.mockImplementationOnce(() => { throw new Error('observation failed') })
+  guest.emit('did-navigate')
+  expect(h.frame.getSnapshot().error).toBeDefined()
+  h.bridge.release.mockRejectedValueOnce(new Error('release failed'))
+  await h.frame.dispose()
+  expect(error.mock.calls.some(call => call[0] === 'Desktop browser guest release failed')).toBe(true)
+})
+
+it('ignores superseded and aborted load promises, but publishes an active navigation rejection', async () => {
+  const h = fixture()
+  const error = vi.spyOn(console, 'error').mockImplementation(() => {})
+  h.mount()
+  h.frame.loadUrl(target)
+  const guest = await h.guest()
+  const stale = Promise.withResolvers<undefined>()
+  guest.loadURL.mockReturnValueOnce(stale.promise)
+  guest.emit('dom-ready')
+  h.frame.loadUrl({ ...target, url: 'https://example.test/new' })
+  stale.reject(new Error('old navigation failed'))
+  await expect(stale.promise).rejects.toThrow('old navigation')
+  expect(h.frame.getSnapshot().error).toBeUndefined()
+  guest.loadURL.mockRejectedValueOnce(Object.assign(new Error('aborted'), { code: 'ERR_ABORTED' }))
+  h.frame.loadUrl({ ...target, url: 'https://example.test/cancelled' })
+  await Promise.resolve()
+  expect(h.frame.getSnapshot().error).toBeUndefined()
+  guest.loadURL.mockRejectedValueOnce(new Error('active navigation failed'))
+  h.frame.loadUrl(target)
+  await vi.waitFor(() => { expect(h.frame.getSnapshot().error).toBeDefined() })
+  expect(error).toHaveBeenCalledOnce()
+})
diff --git a/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts b/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
new file mode 100644
index 0000000000..bd98e06d45
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
@@ -0,0 +1,57 @@
+import { afterEach, expect, it, vi } from 'vitest'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import type { WorkspaceId, WorkspaceSnapshot, WorkspaceView } from '@deepseek-ai/dsh-api-workspace-controller/client'
+import type { SessionId } from '@deepseek-ai/dsh-session/types'
+import { browserWorkspace } from '../src/client/browser/workspace.ts'
+
+const SESSION = 'session' as SessionId
+const workspace = (id: string, path: string, sessionIds: readonly SessionId[]): WorkspaceView => ({
+  workspaceId: id as WorkspaceId, path, title: path, sessionIds, createdAt: '', updatedAt: '',
+})
+const snapshot = (phase: WorkspaceSnapshot['phase'], items: readonly WorkspaceView[] = []): WorkspaceSnapshot => ({
+  phase, items, state: 'idle', error: null, archivedSessionIds: [], pinnedSessionIds: [],
+})
+
+afterEach(() => { vi.restoreAllMocks() })
+
+it('groups resolved Sessions by canonical CWD rather than Workspace identity', async () => {
+  const source = createSnapshotStore(snapshot('ready', [
+    workspace('other', '/other', ['other' as SessionId]), workspace('first', '/canonical', [SESSION]),
+  ]))
+  const signal = new AbortController().signal
+  await expect(browserWorkspace(source, SESSION, signal)).resolves.toBe('cwd:/canonical')
+  source.set(snapshot('ready', [workspace('renamed', '/canonical', [SESSION])]))
+  await expect(browserWorkspace(source, SESSION, signal)).resolves.toBe('cwd:/canonical')
+  await expect(browserWorkspace(source, 'unaccounted', signal)).resolves.toBe('session:unaccounted')
+})
+
+it('waits for an authoritative baseline and removes the readiness subscription', async () => {
+  const source = createSnapshotStore(snapshot('pending'))
+  const subscribe = source.subscribe.bind(source)
+  const stopped = vi.fn()
+  vi.spyOn(source, 'subscribe').mockImplementation((listener) => {
+    const stop = subscribe(listener)
+    return () => { stop(); stopped() }
+  })
+  const lifetime = new AbortController()
+  const result = browserWorkspace(source, SESSION, lifetime.signal)
+  source.set(snapshot('pending', [workspace('partial', '/partial', [SESSION])]))
+  expect(stopped).not.toHaveBeenCalled()
+  source.set(snapshot('ready', [workspace('ready', '/ready', [SESSION])]))
+  await expect(result).resolves.toBe('cwd:/ready')
+  expect(stopped).toHaveBeenCalledOnce()
+  lifetime.abort()
+  expect(stopped).toHaveBeenCalledOnce()
+})
+
+it('rejects cancellation before and during readiness without retaining a listener', async () => {
+  const source = createSnapshotStore(snapshot('pending'))
+  const lifetime = new AbortController()
+  const failure = new Error('tab closed')
+  const result = browserWorkspace(source, SESSION, lifetime.signal)
+  const rejected = expect(result).rejects.toBe(failure)
+  lifetime.abort(failure)
+  await rejected
+  source.set(snapshot('ready'))
+  await expect(browserWorkspace(source, SESSION, lifetime.signal)).rejects.toBe(failure)
+})
diff --git a/packages/client/ui-sidebar-right/src/client/contract/slots.ts b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
index e4468cf80e..28b026a3ad 100644
--- a/packages/client/ui-sidebar-right/src/client/contract/slots.ts
+++ b/packages/client/ui-sidebar-right/src/client/contract/slots.ts
@@ -39,11 +39,15 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
 
   interface SlotMap {
     /** Session content selected by the root-scoped right Sidebar controller. */
-    'rightbar.session': { kind: 'single'; scope: 'session'; owner: RightbarOwnerProps & {
-      readonly active: boolean
-      /** @param tabId - retained body. @param signal - tab occurrence lifetime. @returns releases the View-owned hold. */
-      readonly retainTab: (tabId: TabId, signal: AbortSignal) => () => void
-    } }
+    'rightbar.session': {
+      kind: 'single'
+      scope: 'session'
+      owner: RightbarOwnerProps & {
+        readonly active: boolean
+        /** @param tabId - retained body. @param signal - tab occurrence lifetime. @returns releases the View-owned hold. */
+        readonly retainTab: (tabId: TabId, signal: AbortSignal) => () => void
+      }
+    }
     /**
      * One tab's body, dispatched with the `id` of the type in force for
      * `tab.kind`. A tab type registers here under its definition's `id` and
diff --git a/packages/client/ui-sidebar-right/src/client/session-view.ts b/packages/client/ui-sidebar-right/src/client/session-view.ts
index 1a87112cbe..f36bb3f977 100644
--- a/packages/client/ui-sidebar-right/src/client/session-view.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-view.ts
@@ -31,7 +31,7 @@ export class SidebarSessionView {
     private readonly onTabRelease: (view: SidebarSessionView) => void,
   ) {
     this.reference = sessions.retain(sessionId, { source: 'sidebarView' })
-    void this.reference.ready.catch(error => { console.error('Sidebar Session opening failed:', error) })
+    void this.reference.ready.catch((error: unknown) => { console.error('Sidebar Session opening failed:', error) })
   }
 
   /** Whether an initialized retained body still needs this view. */
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
index 01c87cdb41..04f4122094 100644
--- a/packages/client/ui-sidebar-right/src/client/session-views.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -32,9 +32,9 @@ export class SidebarSessionViews {
     if (this.closed || this.selected === sessionId) return
     this.selected = sessionId
     if (sessionId !== undefined && !this.views.has(sessionId)) {
-      const view = new SidebarSessionView(sessionId, this.sessions, disposed => {
+      const view = new SidebarSessionView(sessionId, this.sessions, (disposed) => {
         this.viewsByReference.delete(disposed.reference)
-      }, released => { this.prune(released) })
+      }, (released) => { this.prune(released) })
       this.views.set(sessionId, view)
       this.viewsByReference.set(view.reference, view)
     }
diff --git a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
index ad19ee4a0d..38a86eff2f 100644
--- a/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
+++ b/packages/client/ui-sidebar-right/src/client/shell/SidebarRight.tsx
@@ -421,7 +421,9 @@ export function RightbarSeat({
   // Republished on every committed change: the service's readers answer from the
   // last commit, and its commands act on the session actually on screen.
   useEffect(
-    () => active ? bindService({ sessionId, actions, surfaces, canSplitPane: paneId => room.current.get(paneId)?.row !== false }) : undefined,
+    () => active
+      ? bindService({ sessionId, actions, surfaces, canSplitPane: paneId => room.current.get(paneId)?.row !== false })
+      : undefined,
     [bindService, sessionId, actions, surfaces, active],
   )
   // The Tab domain is not synced here: the controller adopted this session's
diff --git a/packages/client/ui-sidebar-right/tests/session-views.client.spec.ts b/packages/client/ui-sidebar-right/tests/session-views.client.spec.ts
new file mode 100644
index 0000000000..1c11e825a7
--- /dev/null
+++ b/packages/client/ui-sidebar-right/tests/session-views.client.spec.ts
@@ -0,0 +1,114 @@
+// @vitest-environment jsdom
+import { afterEach, expect, it, vi } from 'vitest'
+import { SlotTestRuntime } from '@deepseek-ai/dsh-client-test-runtime'
+import type { SessionId } from '@deepseek-ai/dsh-session/types'
+import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+import { SidebarSessionView } from '../src/client/session-view.ts'
+import { SidebarSessionViews } from '../src/client/session-views.ts'
+
+const A = 'a' as SessionId
+const B = 'b' as SessionId
+const TAB = 'tab' as TabId
+const runtimes: SlotTestRuntime[] = []
+const owners: { dispose(): void }[] = []
+
+afterEach(async () => {
+  for (const owner of owners.splice(0)) owner.dispose()
+  for (const runtime of runtimes.splice(0)) await runtime.dispose()
+  vi.restoreAllMocks()
+})
+
+async function runtime() {
+  const runtime = await SlotTestRuntime.create()
+  runtimes.push(runtime)
+  await runtime.sessions.add({ id: A })
+  await runtime.sessions.add({ id: B })
+  return runtime
+}
+
+it('keeps one reference per View until the final committed root of a retired View unmounts', async () => {
+  const r = await runtime()
+  const disposed = vi.fn()
+  const changed = vi.fn()
+  const view = new SidebarSessionView(A, r.sessions, disposed, changed)
+  owners.push(view)
+  await view.reference.ready
+  const release = vi.spyOn(view.reference, 'release')
+  const firstMount = view.mount()
+  const secondMount = view.mount()
+  const first = new AbortController()
+  const second = new AbortController()
+  const firstHold = view.retainTab(TAB, first.signal)
+  const secondHold = view.retainTab(TAB, second.signal)
+  firstHold()
+  firstHold()
+  expect(view.hasRetainedTabs).toBe(true)
+  expect(changed).toHaveBeenCalledOnce()
+  second.abort()
+  secondHold()
+  expect(view.hasRetainedTabs).toBe(false)
+  view.retainTab(TAB, second.signal)()
+  view.retire()
+  firstMount()
+  expect(release).not.toHaveBeenCalled()
+  secondMount()
+  expect(release).toHaveBeenCalledOnce()
+  view.retainTab(TAB, first.signal)()
+  view.dispose()
+  expect(disposed).toHaveBeenCalledExactlyOnceWith(view)
+})
+
+it('retires only unselected Views without retained bodies and rejects released reference identities', async () => {
+  const r = await runtime()
+  const views = new SidebarSessionViews(r.sessions)
+  owners.push(views)
+  views.select(A)
+  const first = views.source.getSnapshot()
+  const a = first[0]!
+  views.select(A)
+  expect(views.source.getSnapshot()).toBe(first)
+  const unmount = views.mount(a.reference)
+  const lifetime = new AbortController()
+  const release = vi.spyOn(a.reference, 'release')
+  a.retainTab(TAB, lifetime.signal)
+  views.select(B)
+  expect(views.source.getSnapshot().map(view => [view.sessionId, view.selected])).toEqual([[A, false], [B, true]])
+  lifetime.abort()
+  expect(views.source.getSnapshot().map(view => view.sessionId)).toEqual([B])
+  expect(release).not.toHaveBeenCalled()
+  unmount()
+  expect(release).toHaveBeenCalledOnce()
+  expect(() => views.mount(a.reference)).toThrow('no longer owned')
+  views.select(undefined)
+  expect(views.source.getSnapshot()).toEqual([])
+  views.dispose()
+  views.select(A)
+  views.mount(a.reference)()
+  expect(views.source.getSnapshot()).toEqual([])
+})
+
+it('reports opening failure and releases Views even when committed roots are still present', async () => {
+  const r = await runtime()
+  const reference = r.sessions.retain(A, { source: 'sidebarView' })
+  const failure = new Error('opening failed')
+  const release = vi.fn(() => { reference.release() })
+  vi.spyOn(r.sessions, 'retain').mockReturnValueOnce({
+    sessionId: reference.sessionId,
+    get binding() { return reference.binding },
+    ready: Promise.reject(failure),
+    release,
+    [Symbol.dispose]: () => { reference.release() },
+  })
+  const error = vi.spyOn(console, 'error').mockImplementation(() => {})
+  const views = new SidebarSessionViews(r.sessions)
+  owners.push(views)
+  views.select(A)
+  const view = views.source.getSnapshot()[0]!
+  const unmount = views.mount(view.reference)
+  await expect(view.reference.ready).rejects.toBe(failure)
+  expect(error).toHaveBeenCalledWith('Sidebar Session opening failed:', failure)
+  views.dispose()
+  expect(release).toHaveBeenCalledOnce()
+  unmount()
+  expect(release).toHaveBeenCalledOnce()
+})
diff --git a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
index 567b0f5781..bb9b004503 100644
--- a/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
+++ b/packages/extensions/cordis-client-runner/src/client/slot-catalog.ts
@@ -2664,7 +2664,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.pane.tab\', () => ctx.slots.register(\n      { name: \'sidebar.right.pane.tab\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:54',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:58',
   },
   {
     key: 'sidebar.right.pane.tab.title',
@@ -2713,7 +2713,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.pane.tab.title\', () => ctx.slots.register(\n      { name: \'sidebar.right.pane.tab.title\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:68',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:72',
   },
   {
     key: 'sidebar.right.tab.document',
@@ -3017,7 +3017,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     occupants: [],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.guide\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.guide\', select: owner => null },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:79',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:83',
   },
   {
     key: 'sidebar.right.tab.guide.entry',
@@ -3063,7 +3063,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     ],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.guide.entry\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.guide.entry\', key: \'<one key the owner dispatches>\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:86',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:90',
   },
   {
     key: 'sidebar.right.tab.menu.item',
@@ -3121,7 +3121,7 @@ export const CLIENT_SLOT_API: readonly ClientSlotEntry[] = [
     occupants: [],
     replaceRisk: 'none',
     example: 'return {\n  inject: [\'slots\'],\n  apply(ctx) {\n    ctx.slots.inject(\'sidebar.right.tab.menu.item\', () => ctx.slots.register(\n      { name: \'sidebar.right.tab.menu.item\', id: \'my-entry\', order: 100, label: \'My entry\' },\n      () => React.createElement(\'div\', null, \'hello\'),\n    ))\n  },\n}',
-    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:98',
+    source: 'packages/client/ui-sidebar-right/src/client/contract/slots.ts:102',
   },
   {
     key: 'sidebar.settings',

From d8438ecf06fa67caeaa23ffe9d1abb54cfb3c23e Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 03:25:30 +0800
Subject: [PATCH 57/62] refactor(browser): isolate Electron code and defer
 native coverage

---
 ...26-09-20-desktop-browser-webview.i18n.yaml |  4 ++--
 .../2026-09-20-desktop-browser-webview.md     |  4 +++-
 .../2026-09-20-desktop-browser-webview.zh.md  |  4 +++-
 .../ElectronWebViewImpl.ts                    | 10 ++++-----
 .../ElectronWebviewPresentation.ts            |  4 ++--
 .../src/client/electron/pages.ts              | 22 +++++++++++++++++++
 .../client/{browser => electron}/workspace.ts |  2 +-
 .../ui-sidebar-browser/src/client/index.ts    |  5 +++--
 .../ui-sidebar-browser/src/client/pages.ts    | 22 +------------------
 .../tests/electron-frame.client.spec.ts       |  4 ++--
 .../tests/electron-harness.client.ts          |  4 ++--
 .../tests/workspace.client.spec.ts            |  2 +-
 vitest.config.ts                              |  3 +++
 13 files changed, 50 insertions(+), 40 deletions(-)
 rename packages/client/ui-sidebar-browser/src/client/{browser => electron}/ElectronWebViewImpl.ts (97%)
 rename packages/client/ui-sidebar-browser/src/client/{view => electron}/ElectronWebviewPresentation.ts (96%)
 create mode 100644 packages/client/ui-sidebar-browser/src/client/electron/pages.ts
 rename packages/client/ui-sidebar-browser/src/client/{browser => electron}/workspace.ts (93%)

diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
index 7f4c2e3dfc..432965b93c 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
-2026-09-20-desktop-browser-webview.md: 586cfb378b05d4d1083b810c321f153e5cb93646
-2026-09-20-desktop-browser-webview.zh.md: 8522df6301707ed80c2f75ccda22c63f4e8f2491
+2026-09-20-desktop-browser-webview.md: 63e1d94213aeac5a0fb1cc14192dbb92428d04cf
+2026-09-20-desktop-browser-webview.zh.md: 5b2e1ee033825152a6dca53bd173687bbe26b7f5
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
index 586cfb378b..63e1d94213 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -18,7 +18,7 @@ The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retain
 
 - `BrowserController` owns address commands and recoverable presentation state. Native history stays in the guest; actual URL and title observations update the persisted address.
 - Controller registries are keyed by DSH Session, independently of presentation bindings. Rebinding replaces the store writer without recreating the page.
-- `pages.ts` composes a navigation provider and a presentation object. `ElectronWebViewImpl` owns guest leases and native navigation; `ElectronWebviewPresentation` creates the tag and attaches it inside the Sidebar-owned content container.
+- `electron/pages.ts` composes the Electron navigation provider and presentation object. `ElectronWebViewImpl` owns guest leases and native navigation; `ElectronWebviewPresentation` creates the tag and attaches it inside the Sidebar-owned content container.
 - The Desktop Browser type declares `keepMounted`. Sidebar retains its DOM ancestors across hiding and docking; CSS owns layout and clipping. Docking gestures disable guest pointer input, and body-local drop hints use normal stacking. A physical unmount cancels pending attachment and releases the guest; a later mount recreates it from the known address.
 - Tab occurrence cancellation, plugin unload and window destruction release guests. Guest crashes leave a retryable failure; Reload creates a new guest. Application restart offers the saved title and URL for explicit restoration; it creates no guest until the user restores or submits an address. Page memory and native history are not restored.
 
@@ -55,3 +55,5 @@ The Desktop toolbar has no sandbox-disable switch. The implementation adds no re
 Sidebar-owned stable ancestors preserve the page without Browser-owned geometry or occlusion handling. Hidden guests retain page memory and may continue network activity; there is no idle eviction policy. Persistent storage, selectable isolation scopes and permission-grant UI remain separate work. Temporary Workspace partitions are the current policy, not a promise that Workspace isolation always implies temporary storage.
 
 Focused tests cover native navigation error recovery, preload listener scoping and migrated iframe behavior. They do not establish real Electron attachment timing, overlap, focus, platform styling or storage isolation; those remain runtime verification gaps. No GUI recording accompanies the change. This implementation is not evidence that the complete browser security policy is ready for release.
+
+The package's Electron provider, presentation, page factory and Workspace storage resolver live in `src/client/electron/`. That directory is temporarily excluded from per-file coverage until a native Electron harness covers guest behavior; its unit tests still run. Shared Browser controllers, restoration UI, iframe code and Sidebar retention remain subject to the existing coverage requirements.
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
index 8522df6301..5b2e1ee033 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -18,7 +18,7 @@ Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`；Web 保留显式启用
 
 - `BrowserController` 负责地址命令与可恢复的展示状态。原生 history 留在 guest 内；真实 URL 与标题观察更新持久化地址。
 - 控制器注册表按 DSH Session 索引，不依赖呈现绑定的存活期。重新绑定只替换存储写入方，不重建页面。
-- `pages.ts` 组装导航提供方和呈现对象。`ElectronWebViewImpl` 负责 guest 租约与原生导航；`ElectronWebviewPresentation` 创建标签并挂载到 Sidebar 持有的内容容器内。
+- `electron/pages.ts` 组装 Electron 导航提供方和呈现对象. `ElectronWebViewImpl` 负责 guest 租约与原生导航; `ElectronWebviewPresentation` 创建标签并挂载到 Sidebar 持有的内容容器内.
 - Desktop Browser 类型声明 `keepMounted`。Sidebar 在隐藏和停靠切换时保留其 DOM 祖先，CSS 负责布局与裁剪。停靠手势期间禁用 guest 指针输入，Body 内的放置提示使用普通层叠。物理卸载会取消未完成的挂载并释放 guest，之后重新挂载时从已知地址重建。
 - tab occurrence 取消、插件卸载与窗口销毁会释放 guest。guest 崩溃留下可重试的失败状态；刷新创建新 guest。应用重启展示保存的标题与 URL，等待显式恢复；用户恢复或提交地址之前不创建 guest。不恢复页面内存或原生 history。
 
@@ -55,3 +55,5 @@ Desktop toolbar 没有关闭 sandbox 的开关。实现不增加远程调试端
 Sidebar 持有的稳定祖先保留页面，无需 Browser 自行处理几何或遮挡。隐藏 guest 保留页面内存，也可能继续联网；当前没有空闲回收策略。持久化存储、可选择的隔离级别与权限授权 UI 留作独立工作。临时 Workspace partition 是当前策略，并不意味着 Workspace 隔离必然要求临时存储。
 
 定向测试覆盖原生导航错误恢复、preload 监听范围和已迁移的 iframe 行为。这些测试不能确认真实 Electron 的挂载时序、遮挡、焦点、平台样式或存储隔离；这些仍是运行时验证缺口。本次变更不附带 GUI 录像。此实现不构成完整浏览器安全策略已经可以发布的证据。
+
+包内的 Electron 提供方、呈现适配器、页面工厂与 Workspace 存储解析集中在 `src/client/electron/`. 在原生 Electron 测试环境覆盖 guest 行为之前, 该目录暂时不参与逐文件覆盖率门禁; 其单元测试仍然运行. 共享 Browser 控制器、恢复 UI、iframe 代码和 Sidebar 保活仍遵循现有覆盖率要求.
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts b/packages/client/ui-sidebar-browser/src/client/electron/ElectronWebViewImpl.ts
similarity index 97%
rename from packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
rename to packages/client/ui-sidebar-browser/src/client/electron/ElectronWebViewImpl.ts
index 79c075aaaf..b6987bbc8f 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/ElectronWebViewImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/electron/ElectronWebViewImpl.ts
@@ -1,11 +1,11 @@
 /** Electron navigation and guest lifetime, independent from DOM placement. */
 import { createSnapshotStore, type SnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../../types.ts'
-import type { ElectronWebviewPresentation, WebviewElement } from '../view/ElectronWebviewPresentation.ts'
-import { emptyBrowserFrame, type BrowserFrame, type BrowserFrameState, type BrowserLoadError } from './BrowserFrame.ts'
-import type { BrowserPageOptions } from './BrowserPage.ts'
-import { browserAddressCheckpoint, currentBrowserTarget } from './BrowserPersistence.ts'
-import { parseBrowserAddress, type BrowserTarget } from './url.ts'
+import type { ElectronWebviewPresentation, WebviewElement } from './ElectronWebviewPresentation.ts'
+import { emptyBrowserFrame, type BrowserFrame, type BrowserFrameState, type BrowserLoadError } from '../browser/BrowserFrame.ts'
+import type { BrowserPageOptions } from '../browser/BrowserPage.ts'
+import { browserAddressCheckpoint, currentBrowserTarget } from '../browser/BrowserPersistence.ts'
+import { parseBrowserAddress, type BrowserTarget } from '../browser/url.ts'
 
 interface NavigationEvent extends Event { readonly isMainFrame: boolean }
 interface LoadFailureEvent extends NavigationEvent {
diff --git a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts b/packages/client/ui-sidebar-browser/src/client/electron/ElectronWebviewPresentation.ts
similarity index 96%
rename from packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
rename to packages/client/ui-sidebar-browser/src/client/electron/ElectronWebviewPresentation.ts
index 3fe0c68223..4fc6798e50 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/ElectronWebviewPresentation.ts
+++ b/packages/client/ui-sidebar-browser/src/client/electron/ElectronWebviewPresentation.ts
@@ -1,7 +1,7 @@
 /** Electron tag DOM inside a Sidebar-owned, stable content container. */
 import type { DesktopBrowserReservation } from '../../types.ts'
-import type { BrowserPresentation } from './BrowserPresentation.ts'
-import css from './Browser.module.css'
+import type { BrowserPresentation } from '../view/BrowserPresentation.ts'
+import css from '../view/Browser.module.css'
 
 /** The Electron tag API used by its navigation provider. */
 export interface WebviewElement extends HTMLElement {
diff --git a/packages/client/ui-sidebar-browser/src/client/electron/pages.ts b/packages/client/ui-sidebar-browser/src/client/electron/pages.ts
new file mode 100644
index 0000000000..d2430ad019
--- /dev/null
+++ b/packages/client/ui-sidebar-browser/src/client/electron/pages.ts
@@ -0,0 +1,22 @@
+/** Assemble Electron navigation and presentation behind the shared BrowserPage interface. */
+import type { DesktopBrowserBridge } from '../../types.ts'
+import type { BrowserPage, BrowserPageOptions } from '../browser/BrowserPage.ts'
+import { ElectronWebViewImpl } from './ElectronWebViewImpl.ts'
+import { ElectronWebviewPresentation } from './ElectronWebviewPresentation.ts'
+
+/**
+ * Assemble an idle Electron provider; guest creation waits for mounting and navigation.
+ * @param options - checkpoint and source-tab callbacks.
+ * @param bridge - desktop-only transport.
+ * @param workspace - storage account resolver.
+ * @returns separate navigation and presentation faces.
+ */
+export function createElectronPage(options: BrowserPageOptions, bridge: DesktopBrowserBridge,
+  workspace: (signal: AbortSignal) => Promise<string>): BrowserPage {
+  const presentation = new ElectronWebviewPresentation({
+    mounted: () => { frame.attach() },
+    unmounted: () => { frame.detach() },
+  })
+  const frame = new ElectronWebViewImpl(options, bridge, workspace, presentation)
+  return { frame, presentation }
+}
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts b/packages/client/ui-sidebar-browser/src/client/electron/workspace.ts
similarity index 93%
rename from packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
rename to packages/client/ui-sidebar-browser/src/client/electron/workspace.ts
index 9298529a33..85cd73de20 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/workspace.ts
+++ b/packages/client/ui-sidebar-browser/src/client/electron/workspace.ts
@@ -1,4 +1,4 @@
-/** Resolve CWD-keyed browser storage after the authoritative Workspace list has arrived. */
+/** Resolve CWD-keyed Electron storage after the authoritative Workspace list has arrived. */
 import type { WorkspaceSource } from '@deepseek-ai/dsh-api-workspace-controller/client'
 
 /**
diff --git a/packages/client/ui-sidebar-browser/src/client/index.ts b/packages/client/ui-sidebar-browser/src/client/index.ts
index af5eab39cc..780f7f2d85 100644
--- a/packages/client/ui-sidebar-browser/src/client/index.ts
+++ b/packages/client/ui-sidebar-browser/src/client/index.ts
@@ -9,9 +9,10 @@ import { BrowserBody, type BrowserBodyProps } from './view/BrowserBody.tsx'
 import { BrowserTitle } from './view/BrowserTitle.tsx'
 import { createBrowserControllers } from './browser/BrowserController.ts'
 import type { BrowserInjected } from './browser/BrowserController.ts'
-import { createElectronPage, createIframePage } from './pages.ts'
+import { createIframePage } from './pages.ts'
+import { createElectronPage } from './electron/pages.ts'
 import type { DesktopBrowserBridge } from '../types.ts'
-import { browserWorkspace } from './browser/workspace.ts'
+import { browserWorkspace } from './electron/workspace.ts'
 import type { BrowserPageFactory } from './browser/BrowserPage.ts'
 import { BROWSER_ID, browserDefinition } from './definition.tsx'
 import { en, zh } from './locales.ts'
diff --git a/packages/client/ui-sidebar-browser/src/client/pages.ts b/packages/client/ui-sidebar-browser/src/client/pages.ts
index b3ec7ef9c5..220616b4bd 100644
--- a/packages/client/ui-sidebar-browser/src/client/pages.ts
+++ b/packages/client/ui-sidebar-browser/src/client/pages.ts
@@ -1,10 +1,7 @@
-/** Assemble navigation providers and presentation adapters without platform branches in consumers. */
-import type { DesktopBrowserBridge } from '../types.ts'
+/** Assemble iframe navigation and presentation without platform branches in consumers. */
 import type { BrowserPage, BrowserPageOptions } from './browser/BrowserPage.ts'
 import { IframeImpl } from './browser/IframeImpl.ts'
-import { ElectronWebViewImpl } from './browser/ElectronWebViewImpl.ts'
 import { IframePresentation } from './view/IframePresentation.ts'
-import { ElectronWebviewPresentation } from './view/ElectronWebviewPresentation.ts'
 
 /**
  * Assemble an idle iframe provider and its DOM presentation.
@@ -20,20 +17,3 @@ export function createIframePage(options: BrowserPageOptions): BrowserPage {
   const frame = new IframeImpl(options, presentation)
   return { frame, presentation }
 }
-
-/**
- * Assemble an idle Electron provider; guest creation waits for mounting and navigation.
- * @param options - checkpoint and source-tab callbacks.
- * @param bridge - desktop-only transport.
- * @param workspace - storage account resolver.
- * @returns separate navigation and presentation faces.
- */
-export function createElectronPage(options: BrowserPageOptions, bridge: DesktopBrowserBridge,
-  workspace: (signal: AbortSignal) => Promise<string>): BrowserPage {
-  const presentation = new ElectronWebviewPresentation({
-    mounted: () => { frame.attach() },
-    unmounted: () => { frame.detach() },
-  })
-  const frame = new ElectronWebViewImpl(options, bridge, workspace, presentation)
-  return { frame, presentation }
-}
diff --git a/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
index 53a54ea551..20480c615b 100644
--- a/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/electron-frame.client.spec.ts
@@ -1,7 +1,7 @@
 // @vitest-environment jsdom
 import { expect, it, vi } from 'vitest'
-import { ElectronWebViewImpl } from '../src/client/browser/ElectronWebViewImpl.ts'
-import { ElectronWebviewPresentation, type WebviewElement } from '../src/client/view/ElectronWebviewPresentation.ts'
+import { ElectronWebViewImpl } from '../src/client/electron/ElectronWebViewImpl.ts'
+import { ElectronWebviewPresentation, type WebviewElement } from '../src/client/electron/ElectronWebviewPresentation.ts'
 import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../src/types.ts'
 
 it('clears a failed load when the main page retries without a toolbar command', async () => {
diff --git a/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts b/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
index 31a8f521d5..bebfb96c53 100644
--- a/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
+++ b/packages/client/ui-sidebar-browser/tests/electron-harness.client.ts
@@ -2,8 +2,8 @@
 import { vi } from 'vitest'
 import type { DesktopBrowserBridge, DesktopBrowserLeaseId, DesktopBrowserReservation } from '../src/types.ts'
 import type { BrowserTabState } from '../src/client/browser/BrowserPersistence.ts'
-import { createElectronPage } from '../src/client/pages.ts'
-import { ElectronWebviewPresentation } from '../src/client/view/ElectronWebviewPresentation.ts'
+import { createElectronPage } from '../src/client/electron/pages.ts'
+import { ElectronWebviewPresentation } from '../src/client/electron/ElectronWebviewPresentation.ts'
 
 let sequence = 0
 
diff --git a/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts b/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
index bd98e06d45..236e306ea9 100644
--- a/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/workspace.client.spec.ts
@@ -2,7 +2,7 @@ import { afterEach, expect, it, vi } from 'vitest'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
 import type { WorkspaceId, WorkspaceSnapshot, WorkspaceView } from '@deepseek-ai/dsh-api-workspace-controller/client'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
-import { browserWorkspace } from '../src/client/browser/workspace.ts'
+import { browserWorkspace } from '../src/client/electron/workspace.ts'
 
 const SESSION = 'session' as SessionId
 const workspace = (id: string, path: string, sessionIds: readonly SessionId[]): WorkspaceView => ({
diff --git a/vitest.config.ts b/vitest.config.ts
index baf4f35fc3..22c5e530e3 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -224,6 +224,9 @@ export default defineConfig({
         // harness the jsdom lane doesn't cover yet. TODO(gui): cover and
         // remove as the client test lane matures.
         'packages/client/ui-trajectory/src/*',
+        // Electron guest integration retains its unit specs; per-file coverage
+        // is deferred until a native Electron harness covers guest behavior.
+        'packages/client/ui-sidebar-browser/src/client/electron/**',
         // Trajectory's compact Markdown projection retains deferred branch coverage.
         'packages/client/ui-primitives/src/markdown/plain-text.ts',
         'packages/client/ui-user-questions/src/client/QuestionComposer.tsx',

From 346b27b0373cf50bdda2c62f98ea97e894685987 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 03:36:52 +0800
Subject: [PATCH 58/62] fix(webworker-packer): skip declaration-only export
 roots

---
 .../webworker-packer/README.i18n.yaml         |  4 +-
 .../experimental/webworker-packer/README.md   |  2 +-
 .../webworker-packer/README.zh.md             |  2 +-
 .../experimental/webworker-packer/src/pack.ts | 17 ++++-
 .../webworker-packer/tests/built-lib.e2e.ts   | 17 +++++
 .../webworker-packer/tests/exports.spec.ts    | 69 +++++++++++++++++++
 6 files changed, 104 insertions(+), 7 deletions(-)
 create mode 100644 packages/experimental/webworker-packer/tests/exports.spec.ts

diff --git a/packages/experimental/webworker-packer/README.i18n.yaml b/packages/experimental/webworker-packer/README.i18n.yaml
index 0d9d1a565a..ef7b29f03e 100644
--- a/packages/experimental/webworker-packer/README.i18n.yaml
+++ b/packages/experimental/webworker-packer/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/experimental/webworker-packer/README.md
-README.md: c927fd2f4b3bef3078a263f7b65bb0130898ef5b
-README.zh.md: 2a10a8c0f51f7596d27b8c2ad92a1eeea6715ca8
+README.md: dfb3eccf8343f29c1028dae3a2db22a543675de8
+README.zh.md: 3c528628a8d810db00d9bd8b2c0b64a179faa729
diff --git a/packages/experimental/webworker-packer/README.md b/packages/experimental/webworker-packer/README.md
index c927fd2f4b..dfb3eccf83 100644
--- a/packages/experimental/webworker-packer/README.md
+++ b/packages/experimental/webworker-packer/README.md
@@ -31,7 +31,7 @@ The pack is a three-layer standard stack:
 
 1. **Roster** — the composed profile's plugin rows (standard YAML parse under Include's dialect, `!!js` intact), plus the rows of every config tree the CLI declares in its `package.json` `dsh.configTrees` (agent presets), materialized as a Node-style dependency closure. External peer edges never bind the worker; workspace peers stay on the chain.
 2. **Publish view** — each workspace or vendored package contributes its built npm slice (`files` through picomatch) without source or workspace `dist/`. External packages retain published JavaScript under both `src/` and `dist/` because their `main` or `exports` may point there; only generic test, map, declaration, and archive exclusions apply.
-3. **Reachability sweep** — the runtime loader's own resolution walks from every workspace export face plus the worker assembly's seeds (`IMAGE_ENTRY_SEEDS`), lowering each reached module to the wrapper contract at pack time. The transform reports statically named imports, re-exports, and dynamic imports; calls through `require`; and module-scope direct calls of the form `createRequire(import.meta.url)('pkg')` through a named import from `node:module` or `module`, including an import alias. Page assets (`lib/client.js` behind `./client` exports) ship verbatim; an unresolvable request from our own code fails the pack, third-party ones are tolerated to fail loud at require time.
+3. **Reachability sweep** — the runtime loader's own resolution walks from every non-wildcard workspace runtime export plus the worker assembly's seeds (`IMAGE_ENTRY_SEEDS`), lowering each reached module to the wrapper contract at pack time. Declaration-only condition trees do not seed the sweep; runtime requests for those exports still fail. The transform reports statically named imports, re-exports, and dynamic imports; calls through `require`; and module-scope direct calls of the form `createRequire(import.meta.url)('pkg')` through a named import from `node:module` or `module`, including an import alias. Page assets (`lib/client.js` behind `./client` exports) ship verbatim; an unresolvable request from our own code fails the pack, third-party ones are tolerated to fail loud at require time.
 
 `repository.ts` owns the repo-shaped inputs (workspace scan of `vendor/`, `packages/`, `native/system/packages/`, and `apps/`; profile composition through the real CLI dump path); `pack.ts` owns none of them, so the same library packs a different tree by being called differently. The native scan makes the Landlock entry package an ordinary published-view dependency while its executable remains a Worker platform implementation. The CLI is `dsh-pack-vfs-image --out <file> [--profile web]`; `apps/web`'s `build:preview` runs it after the preview shell build.
 
diff --git a/packages/experimental/webworker-packer/README.zh.md b/packages/experimental/webworker-packer/README.zh.md
index 2a10a8c0f5..3c528628a8 100644
--- a/packages/experimental/webworker-packer/README.zh.md
+++ b/packages/experimental/webworker-packer/README.zh.md
@@ -31,7 +31,7 @@ VFS 镜像打包器：把一份合成 profile 变成浏览器 worker 挂载为
 
 1. **Roster**——合成 profile 的插件行（标准 YAML 解析、Include 方言、`!!js` 原样保留），加上 CLI（命令行界面）在 `package.json` `dsh.configTrees` 里声明的每棵配置树（agent（智能体） presets）的行，按 Node 式依赖闭包物化。外部 peer 边绝不会绑定到 worker，workspace peer 保留在链上。
 2. **发布视图**——每个 workspace 或 vendored 包贡献其构建后的 npm 切片（`files` 走 picomatch），不带源码和 workspace `dist/`。外部包的 `main` 或 `exports` 可能指向 `src/` 或 `dist/`，因此两处发布 JavaScript 都会保留，只应用通用的测试、map、声明与归档排除规则。
-3. **可达性 sweep**——用运行时加载器自己的解析，从全部 workspace 导出面加 worker 装配种子（`IMAGE_ENTRY_SEEDS`）出发，打包时把每个可达模块转换为符合包装层约定的形式。该转换会报告名称可静态确定的 import、re-export 与动态 import、经 `require` 发起的调用，以及通过 `node:module` 或 `module` 具名导入（含导入别名）在模块作用域直接发起的 `createRequire(import.meta.url)('pkg')` 调用。页面资产（`./client` 导出背后的 `lib/client.js`）原样直发；自家代码的不可解析请求会让打包失败，第三方不可解析请求则允许延后到 require 时明确失败。
+3. **可达性 sweep**——用运行时加载器自己的解析, 从全部不含通配符的 workspace 运行时导出加 worker 装配种子 (`IMAGE_ENTRY_SEEDS`) 出发, 打包时把每个可达模块转换为符合包装层约定的形式. 仅含类型声明的条件树不作为扫描入口; 运行时代码请求这些导出仍会失败. 该转换会报告名称可静态确定的 import、re-export 与动态 import、经 `require` 发起的调用, 以及通过 `node:module` 或 `module` 具名导入 (含导入别名) 在模块作用域直接发起的 `createRequire(import.meta.url)('pkg')` 调用. 页面资产 (`./client` 导出背后的 `lib/client.js`) 原样直发; 自家代码的不可解析请求会让打包失败, 第三方不可解析请求则允许延后到 require 时明确失败.
 
 `repository.ts` 拥有仓库形态输入（`vendor/`、`packages/`、`native/system/packages/` 与 `apps/` 的 workspace 扫描；经真 CLI dump 路径合成 profile）；`pack.ts` 一概不拥有，同一库换参即可打另一棵树。Native 扫描使 Landlock 入口包成为普通发布视图依赖，其可执行文件仍由 Worker 平台实现。CLI 为 `dsh-pack-vfs-image --out <file> [--profile web]`；`apps/web` 的 `build:preview` 在预览壳构建后运行它。
 
diff --git a/packages/experimental/webworker-packer/src/pack.ts b/packages/experimental/webworker-packer/src/pack.ts
index 63d37ef6e8..4a065b96e7 100644
--- a/packages/experimental/webworker-packer/src/pack.ts
+++ b/packages/experimental/webworker-packer/src/pack.ts
@@ -349,6 +349,15 @@ function debuggerNamer(workspaces: ReadonlyMap<string, string>, resolveFrom: str
   }
 }
 
+/** Declaration-only condition trees add no runtime roots; explicit imports still resolve normally. */
+function isDeclarationOnlyExport(value: unknown): boolean {
+  if (typeof value !== 'object' || value === null) return false
+  if (Array.isArray(value)) return value.length > 0 && value.every(isDeclarationOnlyExport)
+  const conditions = Object.entries(value)
+  return conditions.length > 0 && conditions.every(([condition, target]) =>
+    condition === 'types' || condition.startsWith('types@') || isDeclarationOnlyExport(target))
+}
+
 function sweepImage(
   files: ImageFiles,
   options: PackOptions,
@@ -383,11 +392,13 @@ function sweepImage(
     } catch {
       continue
     }
-    // Every non-wildcard face is a root; a face resolving onto a page asset is
-    // kept untransformed below rather than excluded here.
+    // Every non-wildcard runtime face is a root; a face resolving onto a page
+    // asset is kept untransformed below rather than excluded here.
     const subpaths = manifest.exports === undefined
       ? ['.']
-      : Object.keys(manifest.exports).filter(key => key.startsWith('.') && !key.includes('*'))
+      : Object.entries(manifest.exports)
+        .filter(([key, target]) => key.startsWith('.') && !key.includes('*') && !isDeclarationOnlyExport(target))
+        .map(([key]) => key)
     for (const subpath of subpaths) {
       queue.push({ specifier: subpath === '.' ? name : `${name}/${subpath.slice(2)}`, from: root, importer: `workspace face ${name}` })
     }
diff --git a/packages/experimental/webworker-packer/tests/built-lib.e2e.ts b/packages/experimental/webworker-packer/tests/built-lib.e2e.ts
index 87ed0e83f1..e945c60c8c 100644
--- a/packages/experimental/webworker-packer/tests/built-lib.e2e.ts
+++ b/packages/experimental/webworker-packer/tests/built-lib.e2e.ts
@@ -87,6 +87,23 @@ it('loads both tarballs through plain Node and mounts their base image and overl
     assert.equal(readFileSync(worker, 'utf8').match(/^import[ \\t]/m), null)
     const base = packer.packVfsImage({ config: '[]\\n', profile: 'packed-consumer', workspaces: new Map(), resolveFrom: process.cwd(), entries: [] })
     assert.deepEqual(base.missing, [])
+    mkdirSync('subject/lib', { recursive: true })
+    const subject = '@deepseek-ai/dsh-image-export-fixture'
+    writeFileSync('subject/package.json', JSON.stringify({ name: subject, files: ['lib'], exports: {
+      '.': { default: './lib/index.js' }, './types': { types: './lib/index.d.ts' },
+    } }))
+    writeFileSync('subject/lib/index.js', 'export const value = 1')
+    writeFileSync('subject/lib/index.d.ts', 'export declare const value: number')
+    const typedOptions = { config: '- id: subject\\n  name: "' + subject + '"\\n', profile: 'typed-consumer',
+      workspaces: new Map([[subject, fileURLToPath(new URL('./subject', import.meta.url))]]),
+      resolveFrom: process.cwd(), entries: [] }
+    const typed = packer.packVfsImage(typedOptions)
+    assert.deepEqual(typed.missing, [])
+    assert.ok(Object.hasOwn(typed.files, 'node_modules/' + subject + '/lib/index.js'))
+    assert.equal(Object.hasOwn(typed.files, 'node_modules/' + subject + '/lib/index.d.ts'), false)
+    writeFileSync('subject/lib/index.js', 'export { value } from "' + subject + '/types"')
+    assert.throws(() => packer.packVfsImage(typedOptions),
+      error => error instanceof Error && error.message.includes('does not export "./types"'))
     const vfs = runtime.loadVfsImage(await runtime.inflateImage(base.image, 'packed base'))
     assert.ok(vfs.existsSync('/dsh/' + packer.MANIFEST_PATH))
     mkdirSync('overlay')
diff --git a/packages/experimental/webworker-packer/tests/exports.spec.ts b/packages/experimental/webworker-packer/tests/exports.spec.ts
new file mode 100644
index 0000000000..b34b157d49
--- /dev/null
+++ b/packages/experimental/webworker-packer/tests/exports.spec.ts
@@ -0,0 +1,69 @@
+/** Runtime reachability ignores declaration-only export roots, not runtime requests. */
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { expect, it, type TestContext } from 'vitest'
+import { packVfsImage, type PackOptions } from '../src/pack.ts'
+
+const SUBJECT = '@deepseek-ai/dsh-image-export-fixture'
+
+function fixture(test: TestContext, face: unknown, source = 'export const value = 1'): PackOptions {
+  const root = mkdtempSync(join(tmpdir(), 'dsh-image-exports-'))
+  test.onTestFinished(() => { rmSync(root, { recursive: true, force: true }) })
+  mkdirSync(join(root, 'lib'))
+  writeFileSync(join(root, 'package.json'), JSON.stringify({
+    name: SUBJECT,
+    type: 'module',
+    files: ['lib'],
+    exports: {
+      '.': { types: './lib/index.d.ts', default: './lib/index.js' },
+      './contract': face,
+    },
+  }))
+  writeFileSync(join(root, 'lib/index.js'), source)
+  writeFileSync(join(root, 'lib/index.d.ts'), 'export declare const value: number')
+  writeFileSync(join(root, 'lib/contract.js'), 'export const value = 2')
+  return {
+    config: `- id: subject\n  name: '${SUBJECT}'\n`,
+    profile: 'export-check',
+    workspaces: new Map([[SUBJECT, root]]),
+    resolveFrom: root,
+    entries: [],
+  }
+}
+
+it.for([
+  { types: './lib/index.d.ts' },
+  { 'types@>=5.2': './lib/index.d.ts' },
+  { browser: { types: './lib/index.d.ts' } },
+  [{ types: './lib/index.d.ts' }],
+])('packs a declaration-only export without requesting a runtime entry: %j', (face, test) => {
+  const result = packVfsImage(fixture(test, face))
+  expect(result.missing).toEqual([])
+  expect(Object.keys(result.files)).toContain(`node_modules/${SUBJECT}/lib/index.js`)
+  expect(Object.keys(result.files)).not.toContain(`node_modules/${SUBJECT}/lib/index.d.ts`)
+  expect(Object.keys(result.files)).not.toContain(`node_modules/${SUBJECT}/lib/contract.js`)
+})
+
+it.for([
+  { types: './lib/index.d.ts', default: './lib/contract.js' },
+  [{ types: './lib/index.d.ts' }, './lib/contract.js'],
+])('retains the runtime target beside a types condition: %j', (face, test) => {
+  const result = packVfsImage(fixture(test, face))
+  expect(Object.keys(result.files)).toContain(`node_modules/${SUBJECT}/lib/contract.js`)
+})
+
+it('rejects a runtime import of a declaration-only export', (test) => {
+  const options = fixture(test, { types: './lib/index.d.ts' }, `export { value } from '${SUBJECT}/contract'`)
+  expect(() => packVfsImage(options)).toThrow('does not export "./contract"')
+})
+
+it('rejects an assembly entry that requests a declaration-only export', (test) => {
+  const options = fixture(test, { types: './lib/index.d.ts' })
+  expect(() => packVfsImage({ ...options, entries: [`${SUBJECT}/contract`] })).toThrow('worker assembly entry')
+})
+
+it('rejects a missing runtime target beside a types condition', (test) => {
+  const options = fixture(test, { types: './lib/index.d.ts', default: './lib/missing.js' })
+  expect(() => packVfsImage(options)).toThrow('cannot resolve')
+})

From 7be9188d20e129615216632f94731f56bed08b32 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 04:12:54 +0800
Subject: [PATCH 59/62] fix(browser): complete preload fixtures and scrollbar
 bindings

---
 .../tests/client-flow.client.spec.tsx                       | 6 +++---
 .../ui-sidebar-browser/src/client/view/Browser.module.css   | 3 +++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/packages/client/ui-directory-picker-native/tests/client-flow.client.spec.tsx b/packages/client/ui-directory-picker-native/tests/client-flow.client.spec.tsx
index 2037b3edd7..ed033999aa 100644
--- a/packages/client/ui-directory-picker-native/tests/client-flow.client.spec.tsx
+++ b/packages/client/ui-directory-picker-native/tests/client-flow.client.spec.tsx
@@ -14,10 +14,10 @@ const desktopIpc = await vi.hoisted(async () => {
   const path = await import('node:path')
   // Electron belongs to the Desktop app; resolve its mock from that workspace.
   const electron = createRequire(path.resolve(import.meta.dirname, '../../../../apps/desktop/package.json')).resolve('electron')
-  return { invoke: vi.fn(), electron }
+  return { invoke: vi.fn(), on: vi.fn(), electron }
 })
 vi.mock(desktopIpc.electron, () => ({
-  ipcRenderer: { invoke: desktopIpc.invoke },
+  ipcRenderer: { invoke: desktopIpc.invoke, on: desktopIpc.on },
   contextBridge: { exposeInMainWorld: (name: string, value: unknown) => { vi.stubGlobal(name, value) } },
 }))
 vi.mock('../../../../apps/desktop/src/preload-platform.ts', () => ({ markDocumentPlatform: vi.fn(), syncWindowFullscreen: vi.fn() }))
@@ -25,7 +25,7 @@ vi.mock('../../../../apps/desktop/src/preload-theme.ts', () => ({ syncNativeThem
 vi.mock('../../../../apps/desktop/src/preload-windows.ts', () => ({ syncWindowsAppearance: vi.fn() }))
 vi.mock('../../../../apps/desktop/src/preload-mandatory-overlay.ts', () => ({ installMandatoryUpdateOverlay: vi.fn() }))
 
-afterEach(() => { cleanup(); vi.unstubAllGlobals(); vi.restoreAllMocks(); desktopIpc.invoke.mockReset() })
+afterEach(() => { cleanup(); vi.unstubAllGlobals(); vi.restoreAllMocks(); desktopIpc.invoke.mockReset(); desktopIpc.on.mockReset() })
 
 const HOLES = ['conversation.hero.workspace.directoryFlow', 'sidebar.workspaces.directoryFlow'] as const
 
diff --git a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
index 86b75721a2..ed6d2cd882 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
+++ b/packages/client/ui-sidebar-browser/src/client/view/Browser.module.css
@@ -81,6 +81,9 @@
 }
 
 .addressUnknown {
+  --dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l2);
+  --dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l2);
+
   color: var(--dsw-alias-label-tertiary);
   background: var(--dsw-alias-bg-layer-2);
 }

From 599f556debe13c570f6f3e2e32e3143cee27a061 Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 04:12:54 +0800
Subject: [PATCH 60/62] test(sidebar): follow retained DOM layout in browser
 checks

---
 .../tests/details-session-lifecycle.e2e.ts    | 34 +++++----
 apps/web/tests/sidebar-right.e2e.ts           | 72 +++++++++++--------
 .../sidebar.expected.md                       |  6 +-
 3 files changed, 65 insertions(+), 47 deletions(-)

diff --git a/apps/web/tests/details-session-lifecycle.e2e.ts b/apps/web/tests/details-session-lifecycle.e2e.ts
index 924105c184..50088b05f7 100644
--- a/apps/web/tests/details-session-lifecycle.e2e.ts
+++ b/apps/web/tests/details-session-lifecycle.e2e.ts
@@ -71,15 +71,22 @@ async function columns(page: Page): Promise<number[]> {
     getComputedStyle(element).gridTemplateColumns.split(' ').map(value => Math.round(Number.parseFloat(value))))
 }
 
+/** Select panes by visual column rather than retained-host DOM order. */
+function paneAt(column: Locator, index: number): Locator {
+  return column.locator(`[data-dockkit-pane][data-dockkit-column="${index}"]`)
+}
+
 /** Tab order and selection inside each docked pane, independent of generated ids. */
 async function paneSnapshot(page: Page) {
-  return await page.locator('[data-rightbar-col] [data-dockkit-pane]').evaluateAll(panes => panes.map(pane => ({
-    active: pane.hasAttribute('data-dockkit-pane-active'),
-    tabs: [...pane.querySelectorAll('[data-dockkit-tab]')].map(tab => ({
-      title: tab.querySelector('[data-dockkit-tab-title]')?.textContent?.trim(),
-      selected: tab.getAttribute('aria-selected') === 'true',
-    })),
-  })))
+  return await page.locator('[data-rightbar-col] [data-dockkit-pane]').evaluateAll(panes => panes
+    .sort((left, right) => Number(left.getAttribute('data-dockkit-column')) - Number(right.getAttribute('data-dockkit-column')))
+    .map(pane => ({
+      active: pane.hasAttribute('data-dockkit-pane-active'),
+      tabs: [...pane.querySelectorAll('[data-dockkit-tab]')].map(tab => ({
+        title: tab.querySelector('[data-dockkit-tab-title]')?.textContent?.trim(),
+        selected: tab.getAttribute('aria-selected') === 'true',
+      })),
+    })))
 }
 
 /** Product-visible geometry, pane state, and expanded Files directories at a settled checkpoint. */
@@ -311,16 +318,15 @@ describe.skipIf(MODE === 'record')('web e2e: details panel follows the current S
         await Promise.allSettled(frame.getAnimations().map(animation => animation.finished))
       })
       await expect.poll(() => detailsTrack(page)).toBe(0)
-      await panel.waitFor({ state: 'hidden' })
+      await panel.locator('[data-dockkit-pane]').first().waitFor({ state: 'hidden' })
     }
 
     await select(original, 'LIGHTHOUSE')
     await open()
     await column.locator('[data-sidebar-right-guide-entry="files"]').click()
-    // The content-box panel adds its one rendered border pixel outside the
-    // CSS width assigned by the grid solver.
+    // Pane borders stay inside the grid width; the shared panel owns no border.
     await expect.poll(() => sidebarSnapshot(page), { timeout: 5_000 })
-      .toMatchObject({ mode: 'push', panelContentWidth: normalWidth, panelOuterWidth: normalWidth + 1, resizeHandleWidth: 8 })
+      .toMatchObject({ mode: 'push', panelContentWidth: normalWidth, panelOuterWidth: normalWidth, resizeHandleWidth: 8 })
     await expect.poll(async () => ({
       filesVisible: await column.locator('[data-files-state="tree"]').isVisible(),
       errors: tripwire.pageErrors,
@@ -330,9 +336,9 @@ describe.skipIf(MODE === 'record')('web e2e: details panel follows the current S
     await expect.poll(() => split.isDisabled()).toBe(false)
     await split.click()
     await expect.poll(() => panes.count()).toBe(2)
-    await panes.last().locator('[data-sidebar-right-guide-entry="files"]').click()
-    await panes.first().locator('[data-dockkit-tab]').filter({ hasText: 'Files' }).click()
-    await expect.poll(() => panes.first().locator('[data-files-state="tree"]').count()).toBe(1)
+    await paneAt(column, 1).locator('[data-sidebar-right-guide-entry="files"]').click()
+    await paneAt(column, 0).locator('[data-dockkit-tab]').filter({ hasText: 'Files' }).click()
+    await expect.poll(() => paneAt(column, 0).locator('[data-files-state="tree"]').count()).toBe(1)
     const retainedA = await paneSnapshot(page)
     expect(retainedA.map(pane => pane.tabs.map(tab => tab.title))).toEqual([['Files', 'Start'], ['Files']])
     await checkpoint('A normal: two panes')
diff --git a/apps/web/tests/sidebar-right.e2e.ts b/apps/web/tests/sidebar-right.e2e.ts
index 9b19dcbdde..af37b968e1 100644
--- a/apps/web/tests/sidebar-right.e2e.ts
+++ b/apps/web/tests/sidebar-right.e2e.ts
@@ -85,17 +85,24 @@ async function pointIn(locator: Locator, fx: number, fy: number): Promise<{ x: n
   return { x: box.x + box.width * fx, y: box.y + box.height * fy }
 }
 
-/** Pause the panel's next real transform transition after observing its initial frame geometry. */
+/** Select panes by CSS column; retained tab hosts keep their independent DOM order. */
+function paneAt(column: Locator, index: number): Locator {
+  return column.locator(`[data-dockkit-pane][data-dockkit-column="${index}"]`)
+}
+
+/** Pause a docked host's next real transform transition at its midpoint. */
 async function holdPanelSlide(panel: Locator) {
   return await panel.evaluateHandle((node) => {
     const controller = new AbortController()
     const state = { animation: null as Animation | null, columnsAtStart: '', dispose: () => { controller.abort() } }
     node.addEventListener('transitionrun', (event) => {
-      if (event.target !== node || (event as TransitionEvent).propertyName !== 'transform') return
+      const target = event.target
+      if (!(target instanceof Element) || !target.matches('[data-dockkit-host="dock"]')
+        || (event as TransitionEvent).propertyName !== 'transform') return
       const frame = node.closest('[style*="grid-template-columns"]')
       if (frame === null) throw new Error('panel frame is unavailable')
       state.columnsAtStart = getComputedStyle(frame).gridTemplateColumns
-      const slide = node.getAnimations().find(animation =>
+      const slide = target.getAnimations().find(animation =>
         'transitionProperty' in animation && animation.transitionProperty === 'transform')
       if (slide === undefined || slide.effect === null) throw new Error('panel transform transition is unavailable')
       slide.pause()
@@ -494,7 +501,9 @@ describe('web e2e: shipped right Sidebar', () => {
       await expect.poll(() => panel.boundingBox()).toEqual({ x: 0, y: 0, ...viewport })
       await column.locator('[data-sidebar-right-toggle]').click()
       await Promise.all([
-        panel.evaluate(async (node) => { await Promise.allSettled(node.getAnimations().map(animation => animation.finished)) }),
+        panel.evaluate(async (node) => {
+          await Promise.allSettled(node.getAnimations({ subtree: true }).map(animation => animation.finished))
+        }),
         frame.evaluate(async (node) => { await Promise.allSettled(node.getAnimations().map(animation => animation.finished)) }),
       ])
       const closedColumns = (await geometry()).columns
@@ -507,7 +516,7 @@ describe('web e2e: shipped right Sidebar', () => {
       try {
         await expandOf(page).click()
         await expect.poll(() => held.evaluate(state => state.animation?.playState)).toBe('paused')
-        const entering = await panel.boundingBox()
+        const entering = await paneAt(column, 0).boundingBox()
         if (entering === null) throw new Error('entering panel is not rendered')
         expect(entering.x).toBeGreaterThan(0)
         expect(entering.x).toBeLessThan(viewport.width)
@@ -525,7 +534,7 @@ describe('web e2e: shipped right Sidebar', () => {
           await column.locator('[data-sidebar-right-toggle]').click()
           await expect.poll(() => exit.evaluate(state => state.animation?.playState)).toBe('paused')
           expect(await exit.evaluate(state => state.columnsAtStart)).toBe(closedColumns)
-          const leaving = await panel.boundingBox()
+          const leaving = await paneAt(column, 0).boundingBox()
           if (leaving === null) throw new Error('leaving panel is not rendered')
           expect(leaving.x).toBeGreaterThan(0)
           expect(leaving.x).toBeLessThan(viewport.width)
@@ -751,7 +760,7 @@ describe('web e2e: shipped right Sidebar', () => {
       await expect.poll(async () => await tabTitles(column)).toEqual(['Files', SAMPLE_NAME])
 
       // Opening the same content again focuses rather than duplicating.
-      await panes.first().locator('[data-dockkit-tab]').first().click()
+      await paneAt(column, 0).locator('[data-dockkit-tab]').first().click()
       await chip.click()
       await expect.poll(async () => await tabTitles(column)).toEqual(['Files', SAMPLE_NAME])
 
@@ -776,20 +785,20 @@ describe('web e2e: shipped right Sidebar', () => {
       expect(await folders.count()).toBe(await page.locator('[data-changed-files]').getByRole('button', { name: /folder/i }).count())
 
       // Split, then dock-drag: the kit's gestures drive the store's actions.
-      await panes.first().locator('[data-dockkit-split-button]').click()
+      await paneAt(column, 0).locator('[data-dockkit-split-button]').click()
       await expect.poll(async () => await panes.count()).toBe(2)
       await dragTo(
         page,
         column.locator('[data-dockkit-tab]').filter({ hasText: SAMPLE_NAME }).first(),
-        await pointIn(panes.nth(1), 0.5, 0.94),
+        await pointIn(paneAt(column, 1), 0.5, 0.94),
       )
       await expect.poll(async () => await panes.count()).toBe(2)
 
-      const splitGuide = panes.nth(1).locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
+      const splitGuide = paneAt(column, 1).locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
       expect(await splitGuide.locator('[data-dockkit-tab-close]').count()).toBe(1)
-      await dragTo(page, splitGuide, await pointIn(panes.first(), 0.5, 0.5))
-      await expect.poll(async () => await tabTitles(panes.nth(1))).toEqual([SAMPLE_NAME])
-      const movedGuide = panes.first().locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
+      await dragTo(page, splitGuide, await pointIn(paneAt(column, 0), 0.5, 0.5))
+      await expect.poll(async () => await tabTitles(paneAt(column, 1))).toEqual([SAMPLE_NAME])
+      const movedGuide = paneAt(column, 0).locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
       await movedGuide.hover()
       await movedGuide.locator('[data-dockkit-tab-close]').click()
 
@@ -798,12 +807,15 @@ describe('web e2e: shipped right Sidebar', () => {
       await expect.poll(async () => await filePane.locator('[data-dockkit-add-tab]').count()).toBe(1)
       expect(await column.locator('[data-dockkit-add-tab]').count()).toBe(2)
 
-      // Floating leaves the column entirely, and survives collapsing it. The
-      // pane the tab was alone in goes with it: an emptied pane never stays.
+      // A float stays in the DOM column but draws outside it and survives collapse.
       const tab = column.locator('[data-dockkit-tab]').filter({ hasText: SAMPLE_NAME }).first()
       await floatByDrag(page, tab)
       await expect.poll(async () => await floats.count()).toBe(1)
-      expect(await column.locator('[data-dockkit-float]').count()).toBe(0)
+      expect(await column.locator('[data-dockkit-float]').count()).toBe(1)
+      const floatBox = await floats.first().boundingBox()
+      const columnBox = await column.boundingBox()
+      if (floatBox === null || columnBox === null) throw new Error('float or column is not rendered')
+      expect(floatBox.x).toBeLessThan(columnBox.x)
       await expect.poll(async () => await panes.count()).toBe(1)
       await shot(page, '04-split-and-float')
 
@@ -899,7 +911,7 @@ describe('web e2e: shipped right Sidebar', () => {
       // 1. Reorder inside one strip: drop the last tab left of its neighbours.
       //    The first pane needs two tabs for this — and for the move below to
       //    leave it standing, since a pane emptied by a move is dropped.
-      const first = panes.first()
+      const first = paneAt(column, 0)
       const strip = first.locator('[data-dockkit-strip]')
       await proseChip(page).click()
       await expect.poll(async () => await tabTitles(first)).toEqual(['Files', SAMPLE_NAME])
@@ -918,8 +930,8 @@ describe('web e2e: shipped right Sidebar', () => {
       }
       const moving = first.locator('[data-dockkit-tab]').first()
       const title = await moving.locator('[data-dockkit-tab-title]').innerText()
-      await dragTo(page, moving, await pointIn(panes.nth(1), 0.5, 0.5))
-      await expect.poll(async () => await tabTitles(panes.nth(1))).toContain(title)
+      await dragTo(page, moving, await pointIn(paneAt(column, 1), 0.5, 0.5))
+      await expect.poll(async () => await tabTitles(paneAt(column, 1))).toContain(title)
 
       const splitButtons = column.locator('[data-dockkit-split-button]')
       await expect.poll(async () => await splitButtons.count()).toBe(0)
@@ -928,14 +940,14 @@ describe('web e2e: shipped right Sidebar', () => {
       await expect.poll(async () => await splitButtons.count()).toBe(0)
 
       const outer = column.locator('[data-dockkit-divider]').first()
-      const before = await width(panes.last())
+      const before = await width(paneAt(column, 1))
       const grip = await centre(outer)
       await dragElement(page, outer, { x: grip.x - 100, y: grip.y })
-      await expect.poll(async () => await width(panes.last())).toBeGreaterThan(before)
+      await expect.poll(async () => await width(paneAt(column, 1))).toBeGreaterThan(before)
       await dragElement(page, outer, { x: 0, y: grip.y })
       const ratio = async (): Promise<number> => {
-        const left = await width(panes.first())
-        const right = await width(panes.last())
+        const left = await width(paneAt(column, 0))
+        const right = await width(paneAt(column, 1))
         return left / (left + right)
       }
       await expect.poll(ratio).toBeCloseTo(0.2, 2)
@@ -947,7 +959,7 @@ describe('web e2e: shipped right Sidebar', () => {
       expect(await splitButtons.count()).toBe(0)
 
       // 5. The split's guide and the document float while Files stays docked.
-      const floatOne = panes.last().locator('[data-dockkit-tab]').filter({ hasText: SAMPLE_NAME })
+      const floatOne = paneAt(column, 1).locator('[data-dockkit-tab]').filter({ hasText: SAMPLE_NAME })
       await floatByDrag(page, floatOne)
       await expect.poll(async () => await floats.count()).toBe(1)
       const box = await floats.first().boundingBox()
@@ -955,8 +967,8 @@ describe('web e2e: shipped right Sidebar', () => {
       await dragElement(page, floats.first().locator('[data-dockkit-float-grip]'), { x: box.x + 140, y: box.y + 90 })
       await expect.poll(async () => (await floats.first().boundingBox())?.x ?? box.x).not.toBe(box.x)
 
-      await expect.poll(async () => await tabTitles(panes.last())).toEqual(['Start'])
-      const second = panes.last().locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
+      await expect.poll(async () => await tabTitles(paneAt(column, 1))).toEqual(['Start'])
+      const second = paneAt(column, 1).locator('[data-dockkit-tab]').filter({ hasText: 'Start' })
       await floatByDrag(page, second)
       await expect.poll(async () => await floats.count()).toBe(2)
 
@@ -976,14 +988,14 @@ describe('web e2e: shipped right Sidebar', () => {
       const panes = column.locator('[data-dockkit-pane]')
       expect(await column.locator('[data-dockkit-tab-close]').count()).toBe(1)
       await proseChip(page).click()
-      await expect.poll(async () => await tabTitles(panes.first())).toEqual(['Files', SAMPLE_NAME])
-      await panes.first().locator('[data-dockkit-split-button]').click()
+      await expect.poll(async () => await tabTitles(paneAt(column, 0))).toEqual(['Files', SAMPLE_NAME])
+      await paneAt(column, 0).locator('[data-dockkit-split-button]').click()
       await expect.poll(async () => await panes.count()).toBe(2)
 
       // Closing a pane's last tab drops the pane: there is no separate
       // "close pane" gesture, and none is needed.
-      await panes.nth(1).locator('[data-dockkit-tab]').first().hover()
-      await panes.nth(1).locator('[data-dockkit-tab-close]').first().click()
+      await paneAt(column, 1).locator('[data-dockkit-tab]').first().hover()
+      await paneAt(column, 1).locator('[data-dockkit-tab-close]').first().click()
       await expect.poll(async () => await panes.count()).toBe(1)
       await expect.poll(async () => await tabTitles(column)).toEqual(['Files', SAMPLE_NAME])
 
diff --git a/snapshots/web/details-session-lifecycle/sidebar.expected.md b/snapshots/web/details-session-lifecycle/sidebar.expected.md
index 2a8b1d5955..9ae98ff006 100644
--- a/snapshots/web/details-session-lifecycle/sidebar.expected.md
+++ b/snapshots/web/details-session-lifecycle/sidebar.expected.md
@@ -17,7 +17,7 @@
   "expanded": true,
   "mode": "push",
   "panelContentWidth": 756,
-  "panelOuterWidth": 757,
+  "panelOuterWidth": 756,
   "coversViewport": false,
   "resizeHandleWidth": 8,
   "expandedDirectories": [],
@@ -246,7 +246,7 @@
   "expanded": true,
   "mode": "push",
   "panelContentWidth": 756,
-  "panelOuterWidth": 757,
+  "panelOuterWidth": 756,
   "coversViewport": false,
   "resizeHandleWidth": 8,
   "expandedDirectories": [],
@@ -281,7 +281,7 @@
   "expanded": true,
   "mode": "push",
   "panelContentWidth": 756,
-  "panelOuterWidth": 757,
+  "panelOuterWidth": 756,
   "coversViewport": false,
   "resizeHandleWidth": 8,
   "expandedDirectories": [],

From 8e441f7da2f462cb970501ca17b7db15c35db5ca Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 04:12:54 +0800
Subject: [PATCH 61/62] test(browser): complete sidebar retention and
 navigation coverage

---
 .../ui-dockkit/src/components/TabLayout.tsx   | 11 +--
 .../tests/tab-layout.client.spec.tsx          | 52 ++++++++++-
 .../src/client/browser/BrowserController.ts   |  1 -
 .../src/client/browser/IframeImpl.ts          |  4 +-
 .../src/client/view/BrowserBody.tsx           |  2 +-
 .../tests/apply.client.spec.ts                | 59 +++++++++++-
 .../tests/browser-body.client.spec.tsx        | 47 +++++++++-
 .../tests/browser-controller.client.spec.ts   | 89 +++++++++++++++++++
 .../tests/browser-frame.client.spec.ts        |  7 ++
 .../src/client/session-views.ts               |  1 -
 10 files changed, 255 insertions(+), 18 deletions(-)

diff --git a/packages/client/ui-dockkit/src/components/TabLayout.tsx b/packages/client/ui-dockkit/src/components/TabLayout.tsx
index 36f37a4ab2..1bb41b353d 100644
--- a/packages/client/ui-dockkit/src/components/TabLayout.tsx
+++ b/packages/client/ui-dockkit/src/components/TabLayout.tsx
@@ -46,23 +46,24 @@ function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRe
   const host = useRef<HTMLElement | null>(null)
   const body = useRef<HTMLDivElement | null>(null)
   useLayoutEffect(() => {
-    if (host.current !== null) host.current.inert = !visible
+    // Both refs target unconditional descendants attached before these effects.
+    const section = host.current as HTMLElement
+    section.inert = !visible
     const focused = document.activeElement
-    if (!visible && focused instanceof HTMLElement && host.current?.contains(focused)) focused.blur()
+    if (!visible && focused instanceof HTMLElement && section.contains(focused)) focused.blur()
     const request = focusRequest.current
     if (!visible || request?.tabId !== tab.id) return
     focusRequest.current = undefined
     // Preserve deliberate focus taken by another control or the newly shown body.
     if (focused !== null && focused !== document.body && focused !== document.documentElement && focused !== request.origin) return
-    const strip = host.current?.querySelector('[data-dockkit-strip]')
+    const strip = section.querySelector('[data-dockkit-strip]')
     const chip = [...strip?.querySelectorAll<HTMLElement>('[data-dockkit-tab]') ?? []]
       .find(element => element.dataset.dockkitTab === tab.id)
     chip?.focus({ preventScroll: true })
   }, [visible, tab.id, focusRequest])
   // Electron emits a non-bubbling focus event on the webview element.
   useEffect(() => {
-    const element = body.current
-    if (element === null) return
+    const element = body.current as HTMLDivElement
     const focus = (): void => {
       if (!visible) return
       if (floating) floats.raise(pane.id)
diff --git a/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
index 7874de6c37..8a884ba72a 100644
--- a/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
+++ b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
@@ -84,9 +84,17 @@ it('keeps body ancestors through pane moves, floating, raising and docking', ()
   fireEvent.pointerDown(h.node('[data-dockkit-divider]'), { button: 0, pointerId: 1 })
   expect(h.callbacks.onDividerPressed).toHaveBeenCalledOnce()
   h.redraw({ preview: undefined })
+  const secondPane = getPane(state, split.children[1]!).id
+  fireEvent.click(h.node(`[data-dockkit-content="${tab}"] [data-dockkit-tab="${tab}"]`))
+  expect(controller.getSnapshot().state.activePaneId).toBe(split.children[0])
+  act(() => { controller.focusPane(secondPane); h.redraw() })
+  fireEvent.focus(body)
+  expect(controller.getSnapshot().state.activePaneId).toBe(split.children[0])
+  act(() => { controller.focusPane(secondPane); h.redraw() })
+  fireEvent.pointerDown(h.node(`[data-dockkit-content="${tab}"]`), { button: 0, pointerId: 1 })
+  fireEvent.click(body)
   fireEvent.focus(body)
   expect(controller.getSnapshot().state.activePaneId).toBe(getPane(state, split.children[0]!).id)
-  const secondPane = getPane(state, split.children[1]!).id
   act(() => { controller.placeTab(tab, secondPane, 0); h.redraw() })
   expect(h.body(tab)).toBe(body)
   expect(body.closest('[data-dockkit-host]')).toBe(host)
@@ -97,6 +105,7 @@ it('keeps body ancestors through pane moves, floating, raising and docking', ()
   act(() => { controller.setExpanded(false); h.redraw() })
   expect(body.closest('[data-dockkit-content]')?.getAttribute('aria-hidden')).toBeNull()
   fireEvent.pointerDown(h.node(`[data-dockkit-float="${floating}"]`), { pointerId: 1, button: 0 })
+  fireEvent.click(h.node(`[data-dockkit-float="${floating}"]`))
   fireEvent.focus(body)
   const resize = h.node('[data-dockkit-float-resize]')
   fireEvent.pointerDown(resize, { pointerId: 2, button: 0, clientX: 500, clientY: 400 })
@@ -125,6 +134,47 @@ it('unmounts unretained bodies and restores focus to their replacement strip', (
   expect(focus).toHaveBeenCalled()
 })
 
+it.for(['new-control', 'origin-control', 'document', 'no-focus'] as const)('transfers tab focus without overriding a new owner: %s', (kind, test) => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller)
+  const control = document.createElement('button')
+  document.body.append(control)
+  test.onTestFinished(() => { control.remove() })
+  if (kind === 'origin-control') control.focus()
+  vi.spyOn(h.callbacks, 'onFocusTab').mockImplementation((id) => {
+    if (kind === 'new-control') control.focus()
+    if (kind === 'document' || kind === 'no-focus') {
+      vi.spyOn(document, 'activeElement', 'get').mockReturnValue(kind === 'document' ? document.documentElement : null)
+    }
+    controller.focusTab(id)
+    h.redraw()
+  })
+  const focus = vi.spyOn(HTMLElement.prototype, 'focus')
+  fireEvent.click(h.node(`[data-dockkit-tab="${second}"]`))
+  if (kind === 'new-control') expect(document.activeElement).toBe(control)
+  else expect(focus).toHaveBeenCalledWith({ preventScroll: true })
+})
+
+it('does not require a docked strip when a selected tab becomes floating in the same update', () => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller)
+  vi.spyOn(h.callbacks, 'onFocusTab').mockImplementation((id) => {
+    controller.focusTab(id)
+    controller.floatTab(id)
+    h.redraw()
+  })
+  fireEvent.click(h.node(`[data-dockkit-tab="${second}"]`))
+  expect(h.node(`[data-dockkit-content="${second}"]`).hasAttribute('data-dockkit-float')).toBe(true)
+})
+
 it('renders an empty pane and rejects unsupported docked trees', () => {
   const controller = new DockController()
   controller.setExpanded(true)
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index 521bd0d761..45d17bb259 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -233,7 +233,6 @@ export function createBrowserControllers(actions: BoundActions<BrowserStore>, cr
         }
         const created = new BrowserController({ ...request, actions: currentActions, createPage })
         const forget = (): void => {
-          if (controllers.get(tabId)?.controller !== created) return
           controllers.delete(tabId)
           // Plugin unload also aborts occurrences; only layout removal deletes saved navigation.
           if (!isTabOpen(tabId)) currentActions.forget(tabId)
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
index 2de462ef1e..0692b80997 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -78,9 +78,7 @@ export class IframeImpl implements BrowserFrame {
       this.store.set({ ...this.store.getSnapshot(), sandboxEnabled: enabled })
       return
     }
-    const request = this.navigation.reload()
-    if (request === undefined) this.publish()
-    else this.load(request)
+    this.load(this.navigation.reload())
   }
 
   private load(request: ReturnType<BrowserNavigation['navigate']> | undefined): void {
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
index 9ea53f03eb..7c5a7e455b 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
@@ -94,7 +94,7 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
           <button type="submit" className={[css.tool, css.addressGo].join(' ')} aria-label={t('go')} title={t('go')}><IconLinkOutlineRegular /></button>
         </div>
         <button type="button" className={css.tool} aria-label={t('external')} title={t('external')} disabled={externalUrl === undefined}
-          onClick={() => { if (externalUrl !== undefined) window.open(externalUrl, '_blank', 'noopener,noreferrer') }}
+          onClick={externalUrl === undefined ? undefined : () => { window.open(externalUrl, '_blank', 'noopener,noreferrer') }}
         ><IconRightUpOutlineRegular size={14} /></button>
         {sandboxed !== undefined && <button
           type="button"
diff --git a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
index 5659489224..311138f63e 100644
--- a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
@@ -1,3 +1,4 @@
+// @vitest-environment jsdom
 /** Browser type, Slot, locale, and HMR disposal through the real registries. */
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { Context } from '@deepseek-ai/cordis'
@@ -9,11 +10,15 @@ import type { BrowserInjected } from '../src/client/browser/BrowserController.ts
 import { BROWSER_ID, BROWSER_KIND } from '../src/client/definition.tsx'
 import { apply, inject } from '../src/client/index.ts'
 import { en, zh } from '../src/client/locales.ts'
+import { createBrowserStore } from '../src/client/browser/store.ts'
+import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../src/types.ts'
 
 const contexts: Context[] = []
 
 afterEach(async () => {
   await Promise.all(contexts.splice(0).map(ctx => ctx.fiber.dispose()))
+  vi.unstubAllGlobals()
 })
 
 interface Recorded {
@@ -47,15 +52,65 @@ async function boot() {
     }),
   }
   ctx.provide('sidebarRightTabs', tabs as never)
-  ctx.provide('sidebarRight', { openTabs: createSnapshotStore([]) } as never)
+  const openTabs = createSnapshotStore<readonly { sessionId: string; tabId: TabId }[]>([])
+  ctx.provide('sidebarRight', { openTabs } as never)
+  ctx.provide('workspaces', { list: createSnapshotStore({ phase: 'ready', items: [] }) } as never)
   ctx.provide('slots', slots as never)
   ctx.provide('locale', locale as never)
   const fiber = ctx.plugin({ inject: [...inject], apply })
   await fiber.await()
-  return { tabs, registered, dictionaries, fiber }
+  return { tabs, registered, dictionaries, fiber, openTabs }
 }
 
 describe('ui-sidebar-browser apply', () => {
+  it.each([0, 1])('binds and rebinds session controllers under desktop protocol %s', async (protocolVersion) => {
+    const acquire = vi.fn(async () => ({ lease: 'test-lease' as DesktopBrowserLeaseId, partition: 'test-partition' }))
+    const bridge: DesktopBrowserBridge = {
+      acquire,
+      release: vi.fn(async () => {}),
+      onOpenRequested: vi.fn(() => () => {}),
+    }
+    vi.stubGlobal('dshDesktop', { protocolVersion, browser: bridge })
+    const h = await boot()
+    expect(h.tabs.get(BROWSER_KIND)?.keepMounted).toBe(protocolVersion === 1)
+    const injectFace = h.registered.find(entry => entry.name === 'sidebar.right.pane.tab')!.inject as
+      (sessionId: string, actions: Parameters<BrowserInjected['rebind']>[0]) => BrowserInjected
+    const firstStore = createBrowserStore().create(`apply-first-${protocolVersion}`)
+    const replacementStore = createBrowserStore().create(`apply-replacement-${protocolVersion}`)
+    const controller = injectFace('session', firstStore.actions)
+    expect(injectFace('session', replacementStore.actions)).toBe(controller)
+    const host = document.createElement('div')
+    host.id = `browser-apply-${protocolVersion}`
+    document.body.append(host)
+    const signal = new AbortController()
+    const tabId = 'apply-tab' as TabId
+    try {
+      controller.mount({ tabId, signal: signal.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: 'https://example.test/', openTab: vi.fn() })
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeDefined()
+      expect(firstStore.getSnapshot().byTab[tabId]).toBeUndefined()
+      if (protocolVersion === 1) await vi.waitFor(() => { expect(acquire).toHaveBeenCalledWith('session:session') })
+      else expect(host.querySelector('iframe')).not.toBeNull()
+      h.openTabs.set([{ sessionId: 'other', tabId }, { sessionId: 'session', tabId: 'other-tab' as TabId }])
+      signal.abort()
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeUndefined()
+      const reopened = new AbortController()
+      controller.mount({ tabId, signal: reopened.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: 'https://retained.example/', openTab: vi.fn() })
+      h.openTabs.set([{ sessionId: 'session', tabId }])
+      reopened.abort()
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeDefined()
+      const active = new AbortController()
+      controller.mount({ tabId, signal: active.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: undefined, openTab: vi.fn() })
+      await h.fiber.dispose()
+      expect(controller.keyedHooks.browserState(tabId)).toBeUndefined()
+    } finally {
+      await h.fiber.dispose()
+      host.remove()
+    }
+  })
+
   it('registers a multi-instance builtin and its body and title', async () => {
     const { tabs, registered, dictionaries } = await boot()
     const definition = tabs.get(BROWSER_KIND)
diff --git a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
index a062a29a15..09ca4e75d1 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
+++ b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { cleanup, fireEvent, render, waitFor } from '@testing-library/react'
+import { act, cleanup, fireEvent, render, waitFor } from '@testing-library/react'
 import { useSyncExternalStore } from 'react'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import type { PaneId, TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
@@ -11,6 +11,10 @@ import { BrowserBody } from '../src/client/view/BrowserBody.tsx'
 import { WEB_BROWSER_SANDBOX } from '../src/client/view/IframePresentation.ts'
 import { createIframePage } from '../src/client/pages.ts'
 import { zh } from '../src/client/locales.ts'
+import { browserAddressCheckpoint, type BrowserTabState } from '../src/client/browser/BrowserPersistence.ts'
+import type { BrowserPageFactory, BrowserPageOptions } from '../src/client/browser/BrowserPage.ts'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import { emptyBrowserFrame, type BrowserFrameState } from '../src/client/browser/BrowserFrame.ts'
 
 const SESSION = 'session' as SessionId
 const TAB = 'tab' as TabId
@@ -33,11 +37,13 @@ const absentState = {
   getSnapshot: (): BrowserControllerState | undefined => undefined,
 }
 
-function mountBrowser(navigation?: { readonly url?: string }) {
+function mountBrowser(navigation?: { readonly url?: string },
+  options: { initial?: BrowserTabState; createPage?: BrowserPageFactory } = {}) {
   const store = createBrowserStore().create(`browser-body-test-${String(++mountSequence)}`)
+  if (options.initial !== undefined) store.actions.replace(TAB, options.initial)
   const lifetime = new AbortController()
   lifetimes.add(lifetime)
-  const injected = createBrowserControllers(store.actions, createIframePage, () => true)
+  const injected = createBrowserControllers(store.actions, options.createPage ?? createIframePage, () => true)
   controllers.push(injected)
   const { keyedHooks, ...commands } = injected
   const tabActions = { openResource: vi.fn(), openTab: vi.fn(), close: vi.fn() }
@@ -67,7 +73,7 @@ function mountBrowser(navigation?: { readonly url?: string }) {
     }
   const renderBody = () => render(<BrowserBody {...props as BrowserBodyProps} />)
   return {
-    view: renderBody(), remount: renderBody, store, lifetime, injected,
+    view: renderBody(), remount: renderBody, store, lifetime, injected, tabActions,
   }
 }
 
@@ -81,6 +87,39 @@ afterEach(async () => {
 })
 
 describe('BrowserBody', () => {
+  it('shows the saved title and URL without loading until Restore is clicked', async () => {
+    const target = { kind: 'https' as const, url: 'https://saved.example/page', title: 'Saved title' }
+    const mounted = mountBrowser(undefined, { initial: browserAddressCheckpoint(target, 1) })
+    expect(mounted.view.getByText(target.title)).toBeDefined()
+    expect(mounted.view.getByText(target.url)).toBeDefined()
+    expect(mounted.view.container.querySelector('iframe')).toBeNull()
+    expect(mounted.view.getByRole('button', { name: zh.reload })).toHaveProperty('disabled', false)
+    fireEvent.click(mounted.view.getByRole('button', { name: zh['restore.action'] }))
+    await waitFor(() => { expect(mounted.view.container.querySelector('iframe')?.src).toBe(target.url) })
+    expect(mounted.view.queryByText(target.title)).toBeNull()
+  })
+
+  it('renders native error details and routes provider open requests through the source tab', () => {
+    const state = createSnapshotStore<BrowserFrameState>({ ...emptyBrowserFrame(), error: { code: -105, description: 'DNS failure' } })
+    const providers: BrowserPageOptions[] = []
+    const mounted = mountBrowser(undefined, { createPage: (options) => {
+      providers.push(options)
+      return {
+        presentation: { mount: () => () => {} },
+        frame: { getSnapshot: () => state.getSnapshot(), subscribe: listener => state.subscribe(listener),
+          loadUrl: vi.fn(), goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), dispose: async () => {} },
+      }
+    } })
+    expect(mounted.view.getByRole('status').textContent).toContain('DNS failure')
+    expect(mounted.view.getByRole('status').textContent).toContain('-105')
+    act(() => { state.set({ ...state.getSnapshot(), error: { code: -105, description: undefined } }) })
+    expect(mounted.view.getByRole('status').textContent).toBe(zh['load.failed'])
+    act(() => { providers[0]!.openRequested('https://new.example/') })
+    expect(mounted.tabActions.openTab).toHaveBeenCalledExactlyOnceWith('browser', {
+      params: { url: 'https://new.example/' }, revealIfOpened: false,
+    })
+  })
+
   it('routes address input to the controller and renders parser failures', async () => {
     const mounted = mountBrowser()
     const input = mounted.view.getByRole('textbox')
diff --git a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
index 5c513a557f..f3b09fb9e5 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
@@ -4,6 +4,10 @@ import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import { BrowserController, createBrowserControllers } from '../src/client/browser/BrowserController.ts'
 import { createBrowserStore } from '../src/client/browser/store.ts'
 import { createIframePage } from '../src/client/pages.ts'
+import type { BrowserPageFactory, BrowserPageOptions } from '../src/client/browser/BrowserPage.ts'
+import { browserAddressCheckpoint } from '../src/client/browser/BrowserPersistence.ts'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import { emptyBrowserFrame, type BrowserFrameState } from '../src/client/browser/BrowserFrame.ts'
 
 const TAB = 'tab' as TabId
 const APP = 'https://dsh.example'
@@ -50,6 +54,91 @@ afterEach(async () => {
 })
 
 describe('BrowserController', () => {
+  it('restores only on request and redirects saved checkpoints to a replacement binding', () => {
+    const h = harness()
+    const saved = browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved page' }, 2)
+    h.store.actions.replace(TAB, saved)
+    const tabLifetime = lifetime()
+    h.mount(tabLifetime.signal)
+    const state = h.face.keyedHooks.browserState(TAB)!
+    expect(state.getSnapshot().restoreTarget?.title).toBe('Saved page')
+    expect(state.getSnapshot().frame.target).toBeUndefined()
+    const rebound = createBrowserStore().create('rebound-browser-controller')
+    h.face.rebind(rebound.actions)
+    h.mount(tabLifetime.signal)
+    expect(rebound.getSnapshot().byTab[TAB]).toEqual(saved)
+    h.face.restore(TAB)
+    expect(h.iframe().src).toBe('https://saved.example/')
+    h.face.restore(TAB)
+    h.face.loadUrl(TAB, 'https://next.example/')
+    expect(rebound.getSnapshot().byTab[TAB]?.entries.at(-1)?.url).toBe('https://next.example/')
+    expect(h.store.getSnapshot().byTab[TAB]).toEqual(saved)
+    tabLifetime.abort()
+    expect(rebound.getSnapshot().byTab[TAB]).toBeDefined()
+    h.face.restore(TAB)
+    h.face.setSandbox(TAB, false)
+    h.mount(tabLifetime.signal)()
+    expect(h.face.keyedHooks.browserState(TAB)).toBeUndefined()
+  })
+
+  it('refresh restores a saved page and ignores cancellation from a retired physical mount', () => {
+    const h = harness()
+    h.store.actions.replace(TAB, browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved' }, 1))
+    const tabLifetime = lifetime()
+    const oldMount = h.mount(tabLifetime.signal)
+    h.face.reload(TAB)
+    const secondHost = document.createElement('div')
+    secondHost.id = 'replacement-browser-host'
+    document.body.append(secondHost)
+    hosts.push(secondHost)
+    h.face.mount({ tabId: TAB, signal: tabLifetime.signal, viewportId: secondHost.id,
+      applicationOrigin: APP, initial: undefined, initialUrl: undefined, openTab: vi.fn() })
+    oldMount()
+    expect(secondHost.querySelector('iframe')?.src).toBe('https://saved.example/')
+    expect(() => h.face.mount({ tabId: TAB, signal: tabLifetime.signal, viewportId: 'missing-browser-host',
+      applicationOrigin: APP, initial: undefined, initialUrl: undefined, openTab: vi.fn() })).toThrow('not mounted')
+  })
+
+  it('validates provider open requests and ignores late provider callbacks after disposal', async () => {
+    const saved = browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved' }, 1)
+    const frames = createSnapshotStore<BrowserFrameState>(emptyBrowserFrame())
+    const callbacks: BrowserPageOptions[] = []
+    const pendingNotifications: (() => void)[] = []
+    const pageFactory: BrowserPageFactory = (options) => {
+      callbacks.push(options)
+      return {
+        frame: { getSnapshot: () => frames.getSnapshot(), subscribe: (listener) => {
+          pendingNotifications.push(listener)
+          return frames.subscribe(listener)
+        }, loadUrl: vi.fn(), goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), dispose: async () => {} },
+        presentation: { mount: () => () => {}, dispose: () => {} },
+      }
+    }
+    const store = createBrowserStore().create('provider-callbacks')
+    const openTab = vi.fn()
+    const controller = new BrowserController({ tabId: TAB, signal: lifetime().signal, applicationOrigin: APP,
+      actions: store.actions, initial: saved, createPage: pageFactory, openTab })
+    disposables.push(controller)
+    const provider = callbacks[0]!
+    provider.openRequested('file:/secret')
+    expect(controller.getSnapshot().addressFailure).toBe('protocol')
+    provider.openRequested('https://new.example/path')
+    expect(openTab).toHaveBeenCalledExactlyOnceWith('https://new.example/path')
+    controller.setSandbox(false)
+    frames.set({ ...emptyBrowserFrame(), loading: true })
+    expect(controller.getSnapshot().restoreTarget?.title).toBe('Saved')
+    expect(controller.getSnapshot().addressFailure).toBe('protocol')
+    const before = controller.getSnapshot()
+    await controller.dispose()
+    controller.start('https://ignored.example/')
+    provider.persist(saved)
+    provider.openRequested('https://ignored.example/')
+    for (const notify of pendingNotifications) notify()
+    expect(controller.getSnapshot()).toBe(before)
+    expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
+    expect(openTab).toHaveBeenCalledOnce()
+  })
+
   it('ignores navigation commands after its tab occurrence ends', async () => {
     const store = createBrowserStore().create('browser-controller-ended-test')
     const tabLifetime = lifetime()
diff --git a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
index 351de080fd..8ef82c7665 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
@@ -17,6 +17,9 @@ describe('IframeImpl', () => {
     const listener = vi.fn()
     const unsubscribe = frame.subscribe(listener)
     try {
+      frame.handleLoaded(0)
+      expect(frame.getSnapshot().address).toBe('empty')
+      frame.sandbox.setEnabled(false)
       frame.sandbox.setEnabled(false)
       expect(frame.getSnapshot().sandboxEnabled).toBe(false)
       expect(frame.getSnapshot().target).toBeUndefined()
@@ -43,6 +46,10 @@ describe('IframeImpl', () => {
       frame.handleLoadFailed(2)
       frame.handleLoaded(2)
       frame.reload()
+      frame.loadUrl(target)
+      frame.goBack()
+      frame.goForward()
+      frame.sandbox.setEnabled(true)
       expect(frame.getSnapshot()).toBe(stopped)
     } finally {
       unsubscribe()
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
index 04f4122094..232b310755 100644
--- a/packages/client/ui-sidebar-right/src/client/session-views.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -73,7 +73,6 @@ export class SidebarSessionViews {
   }
 
   private publish(): void {
-    if (this.closed) return
     this.source.set([...this.views.values()].sort((a, b) => a.sessionId.localeCompare(b.sessionId)).map(view => ({
       sessionId: view.sessionId, reference: view.reference, selected: view.sessionId === this.selected, retainTab: view.retainTab,
     })))

From 640e26806b5223f3fd445b2724e94542b05b1cba Mon Sep 17 00:00:00 2001
From: imccyu <cc.yu@deepseek.com>
Date: Mon, 21 Sep 2026 11:10:31 +0800
Subject: [PATCH 62/62] docs(sidebar): describe the final retained browser
 architecture

---
 .../2026-09-20-sidebar-retained-tab-layout.i18n.yaml   |  4 ++--
 .../2026-09-20-sidebar-retained-tab-layout.md          | 10 ++++------
 .../2026-09-20-sidebar-retained-tab-layout.zh.md       | 10 ++++------
 .../2026-09-20-desktop-browser-webview.i18n.yaml       |  4 ++--
 .../feature/2026-09-20-desktop-browser-webview.md      |  4 ++--
 .../feature/2026-09-20-desktop-browser-webview.zh.md   |  4 ++--
 6 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
index 1c6d9a342c..061872368c 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
-2026-09-20-sidebar-retained-tab-layout.md: edcbea073bed976ac30dc75a992f3c41031766d2
-2026-09-20-sidebar-retained-tab-layout.zh.md: 98fc38f605e61e39b715d854bb815a8bfba90abc
+2026-09-20-sidebar-retained-tab-layout.md: 9579a0ba47c56f1d533f066fddd37e7ddf443346
+2026-09-20-sidebar-retained-tab-layout.zh.md: 365ad5682c8610cab5dc855984e58b4303bfae49
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
index edcbea073b..9579a0ba47 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.md
@@ -6,9 +6,7 @@ English | [中文](2026-09-20-sidebar-retained-tab-layout.zh.md)
 
 ## Problem
 
-Restoring Session-specific tab records and URLs does not preserve a live browsing context. The recursive docked renderer mounts only an active body, a separate floating portal creates another body, and changing a Session binding remounts Session-scoped slots. Electron 44's `WebViewElement.disconnectedCallback` detaches and resets its guest, so preserving a React key or caching an element reference cannot compensate for disconnected ancestors.
-
-The first [Desktop Browser implementation](../feature/2026-09-20-desktop-browser-webview.md) keeps its guest under a fixed body-level parent and follows a placeholder with RAF measurements. User trials report working float, collapse and Session switches with that implementation; this change replaces its geometry mechanism, not a demonstrated failure of those interactions. Real parent layout must own content size, clipping and overlap.
+Restoring Session-specific tab records and URLs does not preserve a live browsing context. Unmounting a body or changing its DOM ancestors during tab, pane or Session transitions disconnects its page. Electron 44's `WebViewElement.disconnectedCallback` detaches and resets its guest, so preserving a React key or caching an element reference cannot compensate for disconnected ancestors. Content size, clipping and overlap must also follow the actual parent layout.
 
 ## Decision
 
@@ -59,13 +57,13 @@ The [Desktop Browser decision](../feature/2026-09-20-desktop-browser-webview.md)
 
 **Hide panes only.** Collapse works, but moving between panes or into another floating portal still changes content ancestors.
 
-**Retain bodies only in the foreground Session.** Session-slot remounting still disconnects the page and fails to preserve the existing Session-switch experience.
+**Retain bodies only in the foreground Session.** Session-slot remounting disconnects the page and loses its live state on Session switches.
 
 **Give each tab its own Session reference.** A view's tabs share one `SessionProvider`, whose reference must exist before their bodies render. Per-view ownership covers that parent and its children without an additional reference lifecycle for each tab.
 
 **Cache and reparent DOM.** Ordinary reparenting invokes Electron disconnection. Atomic-move dependencies, private attachment APIs and lifecycle monkey-patches are not used.
 
-**Keep the fixed Browser overlay with event-driven measurement or CSS anchor positioning.** Content remains separate from the layout it imitates; the content itself must participate in Grid/Flex.
+**Position Browser content in a separate overlay.** Measurement or CSS anchors can align an overlay, but its content remains outside the parent Grid/Flex layout that must own its sizing and clipping.
 
 **Use native popovers.** Top-layer elements cannot be covered by ordinary Portal content through `z-index`. Migrating menus and dialogs into another stacking system expands the work beyond Sidebar; the implementation preserves the existing Portal and layer model.
 
@@ -77,7 +75,7 @@ The [Desktop Browser decision](../feature/2026-09-20-desktop-browser-webview.md)
 
 Layout correctness belongs to Sidebar/DockKit rather than Browser. The cost is stable content containers and explicit Session-reference ownership: background retention holds Session scopes and subscriptions as well as page memory. There is no implicit LRU or idle timeout; future reclamation requires an explicit suspension/recovery policy. Other tab types do not automatically acquire these costs.
 
-The change affects Sidebar chrome, float stacking, focus and platform styles, not just the Browser package. The owning [docking infrastructure](../feature/2026-09-04-right-sidebar-docking-infrastructure.md) and Desktop Browser notes remain active for their independent engine, navigation, storage and security decisions. Their separated-content presentation is superseded here; layout persistence and tab-type navigation remain applicable.
+Sidebar/DockKit own chrome, float stacking, focus and platform styles as well as retained content placement. The [docking infrastructure](../feature/2026-09-04-right-sidebar-docking-infrastructure.md) owns the layout engine, persistence and tab-type navigation; the [Desktop Browser decision](../feature/2026-09-20-desktop-browser-webview.md) owns guest navigation, storage and security.
 
 ## Verification
 
diff --git a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
index 98fc38f605..365ad5682c 100644
--- a/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
+++ b/.agents/notes/implemented/architecture/2026-09-20-sidebar-retained-tab-layout.zh.md
@@ -6,9 +6,7 @@ Status: implemented
 
 ## Problem
 
-恢复各会话的 Tab 记录和 URL，并不能保留活的浏览上下文。递归停靠渲染只挂载活动 Body，独立浮动 Portal 会创建另一个 Body，切换会话绑定还会重挂载会话级 slot。Electron 44 的 `WebViewElement.disconnectedCallback` 会 detach 并重置 guest，因此保持 React key 或缓存元素引用不能抵消祖先断开。
-
-首版 [Desktop Browser 实现](../feature/2026-09-20-desktop-browser-webview.zh.md)把 guest 留在 body 下的固定父节点中，通过 RAF 测量跟随占位元素。用户试用该实现时报告浮动、收起和切会话均可工作；本次替换的是其几何处理方式，并非这些交互已被证实存在故障。内容尺寸、裁剪与重叠必须由真实父节点布局负责。
+恢复各会话的 Tab 记录和 URL, 并不能保留活的浏览上下文. 在 Tab、Pane 或会话切换期间卸载 Body 或改变其 DOM 祖先, 都会断开页面. Electron 44 的 `WebViewElement.disconnectedCallback` 会 detach 并重置 guest, 因此保持 React key 或缓存元素引用不能抵消祖先断开. 内容尺寸、裁剪与重叠也必须遵循真实父节点布局.
 
 ## Decision
 
@@ -59,13 +57,13 @@ Tab 提供 Body 保活持有，而不独立申请会话引用。View 的稳定 `
 
 **只隐藏 Pane。** 可以覆盖收起，但跨 Pane 移动或进入独立浮动 Portal 仍会改变内容祖先。
 
-**只保留前台会话的 Body。** 会话 slot 重挂载仍会断开页面，无法保留现有的切会话体验。
+**只保留前台会话的 Body.** 会话 slot 重挂载会断开页面, 导致切会话时丢失页面运行状态.
 
 **每个 Tab 独立持有会话引用。** 同一视图的 Tab 共用一个 `SessionProvider`，它的引用必须先于这些 Body 渲染而存在。按视图持有即可覆盖父级及其子节点，无须再为每个 Tab 管理一份引用生命周期。
 
 **缓存并搬移 DOM。** 普通 reparent 会触发 Electron 断开处理；实现不依赖原子搬移、私有挂载 API 或生命周期补丁。
 
-**保留固定 Browser 浮层，改为事件驱动测量或 CSS 锚点定位。** 内容仍然与它模拟的布局分离，而内容本身必须参与 Grid/Flex。
+**把 Browser 内容放在独立浮层中.** 测量或 CSS 锚点可以对齐浮层, 但内容仍处于负责其尺寸与裁剪的父级 Grid/Flex 布局之外.
 
 **使用原生 popover。** 普通 Portal 内容无法通过 `z-index` 覆盖 top layer 元素。把菜单、对话框迁移到另一套层叠体系会扩大 Sidebar 之外的改动；实现保留既有 Portal 和层级模型。
 
@@ -77,7 +75,7 @@ Tab 提供 Body 保活持有，而不独立申请会话引用。View 的稳定 `
 
 布局正确性由 Sidebar/DockKit 负责，而不是 Browser。代价是稳定的内容容器与显式会话引用所有权：后台保活不仅持有页面内存，也持有会话 scope 和订阅。没有隐式 LRU 或空闲超时，未来回收需要明确的暂停与恢复策略；其他 Tab 类型不会自动承担这些成本。
 
-变更涉及 Sidebar 控件、浮窗层级、焦点和平台样式，不仅是 Browser 包。[停靠基础设施](../feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md)和 Desktop Browser 记录的引擎、导航、存储与安全决策仍独立有效，因此保留为活动记录；其中的分离内容呈现由本文替代，布局持久化和 Tab 类型导航继续适用。
+Sidebar/DockKit 除了负责保活内容布局, 还负责控件、浮窗层级、焦点和平台样式. [停靠基础设施](../feature/2026-09-04-right-sidebar-docking-infrastructure.zh.md)负责布局引擎、持久化和 Tab 类型导航; [Desktop Browser 决策](../feature/2026-09-20-desktop-browser-webview.zh.md)负责 guest 导航、存储和安全.
 
 ## Verification
 
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
index 432965b93c..254189ee9f 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
-2026-09-20-desktop-browser-webview.md: 63e1d94213aeac5a0fb1cc14192dbb92428d04cf
-2026-09-20-desktop-browser-webview.zh.md: 5b2e1ee033825152a6dca53bd173687bbe26b7f5
+2026-09-20-desktop-browser-webview.md: e69114a90f50d51542e9b6a0d40daef05a93001f
+2026-09-20-desktop-browser-webview.zh.md: b0ab8b1a7058ae9cbb1258977cb4c4e2d8c40614
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
index 63e1d94213..e69114a90f 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.md
@@ -6,13 +6,13 @@ English | [中文](2026-09-20-desktop-browser-webview.zh.md)
 
 ## Problem
 
-An iframe cannot expose cross-origin navigation or render sites that refuse embedding. Sidebar tab bodies also unmount when their tab becomes inactive or changes containers. Creating an Electron guest inside that body couples page state to presentation and discards forms, scroll position and native history.
+An iframe cannot expose cross-origin navigation or render sites that refuse embedding. An Electron guest loses forms, scroll position and native history if its tab body unmounts on selection or container changes. Page lifetime must therefore remain independent of visibility and layout changes.
 
 Independent per-tab storage also prevents related pages in one Workspace from sharing site login state. Page lifetime and storage ownership need different owners.
 
 ## Decision
 
-Desktop uses `<webview>` through `ElectronWebViewImpl`; Web retains its opt-in iframe carrier. The [Sidebar Browser decision](2026-09-16-sidebar-browser.md) continues to own shared tab behavior and iframe limitations. This note replaces its deferred Desktop mounting and per-tab partition design.
+Desktop uses `<webview>` through `ElectronWebViewImpl`; Web retains its opt-in iframe carrier. The [Sidebar Browser decision](2026-09-16-sidebar-browser.md) owns shared tab behavior and iframe limitations; this note owns the Desktop carrier and Workspace-keyed partitions.
 
 The [stable Sidebar mounting decision](../architecture/2026-09-20-sidebar-retained-tab-layout.md) owns retained Session and tab containers in real CSS layout. Workspace storage ownership and baseline guest security remain with this note.
 
diff --git a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
index 5b2e1ee033..b0ab8b1a70 100644
--- a/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
+++ b/.agents/notes/implemented/feature/2026-09-20-desktop-browser-webview.zh.md
@@ -6,13 +6,13 @@ Status: implemented
 
 ## Problem
 
-iframe 无法提供跨域导航状态，也无法显示拒绝嵌入的站点。Sidebar tab body 在 tab 失去活动状态或更换容器时还会卸载。直接在 body 内创建 Electron guest，会让页面状态依赖呈现组件，丢失表单、滚动位置与原生 history。
+iframe 无法提供跨域导航状态, 也无法显示拒绝嵌入的站点. 如果 Tab Body 因选中项或容器变化而卸载, Electron guest 就会丢失表单、滚动位置与原生 history. 页面生命周期因此必须独立于可见性和布局变化.
 
 独立的 per-tab 存储也会阻止同一 Workspace 内相关页面共享站点登录态。页面生命周期与存储需要不同的所有者。
 
 ## Decision
 
-Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`；Web 保留显式启用的 iframe 载体。[Sidebar Browser 决策](2026-09-16-sidebar-browser.zh.md)继续负责共享 tab 行为与 iframe 限制。本文替代其中延期的 Desktop 挂载与 per-tab 分区设计。
+Desktop 通过 `ElectronWebViewImpl` 使用 `<webview>`; Web 保留显式启用的 iframe 载体. [Sidebar Browser 决策](2026-09-16-sidebar-browser.zh.md)负责共享 Tab 行为与 iframe 限制; 本文负责 Desktop 载体和按 Workspace 共享的分区.
 
 [Sidebar 稳定挂载决策](../architecture/2026-09-20-sidebar-retained-tab-layout.zh.md)负责真实 CSS 布局中的保活会话与 Tab 容器。Workspace 存储所有权与 guest 基础安全配置仍由本文负责。