Restore an archived workspace when its agent is reopened

Reopening an archived agent previously dead-ended at "workspace not
found": the agent record was un-archived but its workspace stayed
archived and was never sent to the client.

The daemon now un-archives the owning workspace alongside the agent when
its backing directory still exists, and the app auto-fires the restore
ahead of the missing-workspace gate so the user lands back in the
workspace rather than a dead end.

Worktrees whose directory was deleted on archive are not yet restorable
(recreating them from their branch is a follow-up); the workspace record
now persists its base branch as groundwork for that.

packages/app/src/i18n/resources/ar.ts

@@ -328,6 +328,8 @@ export const ar: TranslationResources = {
   workspace: {
     route: {
       loading: "جارٍ تحميل مساحة العمل",
+      restoring: "جارٍ استعادة مساحة العمل",
+      restoreFailed: "تعذّر استعادة مساحة العمل هذه — ربما تم نقل المجلد أو حذفه",
       connecting: "الاتصال",
       hostOffline: "{{hostName}}غير متواجد حالياً",
       cannotReachHost: "لا يمكن الوصول إلى{{hostName}}",