fix(settings): let modal restore preset guide focus

packages/client/ui-agent-preset/src/client/PresetGuideDialog.tsx

@@ -95,11 +95,7 @@ export function PresetGuideDialog({ guide, initialPage, t, onClose }: {
   const content = useRef<HTMLDivElement>(null)
 
   useLayoutEffect(() => {
-    const previous = document.activeElement
     content.current?.querySelector<HTMLButtonElement>('[role="tab"][aria-selected="true"]')?.focus()
-    return () => {
-      if (previous instanceof HTMLElement) previous.focus()
-    }
   }, [])
 
   // This reader sits above Settings. Keep keyboard navigation in the reader,

packages/client/ui-agent-preset/tests/section.client.spec.tsx

@@ -181,11 +181,12 @@ it.each([
   expect(actions.makeDefault).not.toHaveBeenCalled()
 })
 it('keeps keyboard focus in help and dismisses only the reader on Escape', () => {
-  const actions = view()
+  const closeSettings = vi.fn()
+  const actions = view({}, undefined, true, closeSettings)
   const trigger = within(rowFor('standard')).getByRole('button', { name: `${en.modeExplanation}: ${en.presetStandardName}` })
   trigger.focus()
   fireEvent.click(trigger)
-  const dialog = screen.getByRole('dialog')
+  const dialog = screen.getByRole('dialog', { name: en.presetStandardName })
   const details = within(dialog).getByRole('tab', { name: en.modeExplanation })
   const panel = within(dialog).getByRole('tabpanel', { name: en.modeExplanation })
   const close = within(dialog).getByRole('button', { name: en.close })
@@ -197,8 +198,10 @@ it('keeps keyboard focus in help and dismisses only the reader on Escape', () =>
   fireEvent.keyDown(close, { key: 'Tab', shiftKey: true })
   expect(document.activeElement).toBe(panel)
   fireEvent.keyDown(panel, { key: 'Escape' })
-  expect(screen.queryByRole('dialog')).toBeNull()
+  expect(screen.queryByRole('dialog', { name: en.presetStandardName })).toBeNull()
+  expect(screen.getByRole('dialog', { name: 'Settings' })).toBeTruthy()
   expect(document.activeElement).toBe(trigger)
+  expect(closeSettings).not.toHaveBeenCalled()
   expect(actions.close).not.toHaveBeenCalled()
 })
 it('connects keyboard selection to the visible guide panel', () => {