fix(host): address review — Escape scoping, relist gating, crumb overflow, aria golden

- Escape (and the mask) now reaches only the topmost dialog: while the
  nested New-folder dialog is up the browser ignores its own Modal close,
  and the nested dialog's in-flight fence keeps both open during creation.
- New folder disables while any listing loads, so a slow post-create
  relist/select sequence cannot host a second create against a target the
  pending listing is about to change.
- Deep ancestry scrolls inside a dedicated crumb trail whose tail is pinned
  into view; the path-edit zone keeps its reserved width instead of being
  clipped by the card, preserving cross-drive path entry.
- The workspace-management e2e records a directory-browser aria golden at a
  staged tree (host HOME pointed at the scaffold cwd collapses ancestry into
  the Home crumb, keeping the artifact machine-independent), and the keyless
  snapshot's row targeting goes through visible label text — listitem
  accessible-name computation differs across dom-accessibility-api
  environments (the CI-only miss).

apps/web/tests/workspace-flow.snapshot.ts

@@ -197,8 +197,11 @@ it('adopts a directory through the composed in-app browse flow and lands in its
   // The browse occupant renders the Select Workspace Directory dialog at the
   // fixture home; select Documents, advance into project, and adopt it.
   const dialog = await screen.findByRole('dialog', { name: '选择工作区目录' }, { timeout: 10_000 })
-  fireEvent.click(await within(dialog).findByRole('listitem', { name: /Documents/ }, { timeout: 10_000 }))
-  fireEvent.click(await within(dialog).findByRole('listitem', { name: /^project/ }, { timeout: 10_000 }))
+  // Row targeting goes through the visible label text: listitem accessible-name
+  // computation differs across dom-accessibility-api environments, while the
+  // row's name span is stable (clicks bubble to the row button).
+  fireEvent.click(await within(dialog).findByText('Documents', {}, { timeout: 10_000 }))
+  fireEvent.click(await within(dialog).findByText('project', {}, { timeout: 10_000 }))
   fireEvent.click(within(dialog).getByRole('button', { name: '打开' }))
   await findHeroComposer()
   await waitFor(() => {