Keeps both window-chrome features: this branch's macOS shell.leading seat,
single drag owner, and fullscreen sync alongside upstream's Windows desktop
titlebar (#4407). ipc.ts and preload-app.ts merge both platforms' channels
and preload wiring; Tooltip merges upstream's suppression context with this
branch's pointer-focus suppression; slot-catalog regenerated.
One 52px leadingBand in the AppFrame (frame's first child) plus the sidebar
logoRow are the only -webkit-app-region drag surfaces; everything interactive
subtracts itself through two global base.css rules (interactive elements and
body > :not(#root) overlay portals), so header controls, breadcrumb chips, and
strip tabs stay clickable under the band. A ui-theme stylesheet gate pins the
two-file drag allowlist. The frame publishes --dsh-frame-top-clearance (48px)
for entry pages (plugin manager list and detail) beside the existing
--dsh-frame-leading-clearance, replacing per-page hardcoded insets. The
shell.leading window-chrome seat moves the collapsed-sidebar reopen controls
from the conversation header to the frame. Sidebar vibrancy tint drops the
blue cast in dark mode and halves its fill opacity, light mode softens the
blue mix, and the logo row tightens 4px above New Session.
hiddenInset titlebar with traffic lights over a vibrancy sidebar, darwin-only
via data-platform set by the desktop preload: transparent chain to the window
material, native-theme sync from the app theme source, sidebar top strip +
full hide when collapsed with reopen controls in the new
conversation.session.header.leading slot, title-row drag regions, and
fullscreen right-sidebar traffic-light clearance via the dockkit strip inset.
Apply global visual polish across the web client: corner-shape:
superellipse(1.5) with corner-shape: round pairing for full circles,
elevation tokens that draw 0.5px stroke outlines inside box-shadow for
floating surfaces, 0.5px hairline borders and divider lines for
neutral-token strokes, and tuned stroke contrast plus larger radii for
menus, settings panels, and cards. Stylesheet-scan specs in ui-theme
reject unpaired circles, border+shadow mixes, and 1px neutral hairlines
repo-wide.
Closes#3287
Progressive enhancement on body in the shell base sheet so mixed
Chinese/English copy gets consistent spacing without content edits;
engines without support ignore the property.
Tianyi Cui