improve(macos): replace browser cookie-import modal with an inline dashboard banner (#104591)

* feat(macos): replace browser cookie-import modal with dashboard banner

* fix(macos): cross-browser menu identity, banner pane ownership, docs map

* chore: refresh native i18n inventory

* fix(macos): stale import status polls no longer clobber fresher banner state

* fix(macos): generation-guard stale import polls; drop dashboard-show poll trigger

* fix(macos): session-sticky dismissal and localized banner copy

docs/docs_map.md

@@ -5212,6 +5212,7 @@ Do not edit it by hand; run `pnpm docs:map:gen`.
   - H2: First run
   - H2: Updates
   - H2: Open dashboard links
+  - H2: Import browser logins
   - H2: Choose a Gateway mode
   - H2: What the app owns
   - H2: macOS detail pages