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/fr.ts

@@ -331,6 +331,9 @@ export const fr: TranslationResources = {
   workspace: {
     route: {
       loading: "Chargement de l'espace de travail",
+      restoring: "Restauration de l'espace de travail",
+      restoreFailed:
+        "Impossible de restaurer cet espace de travail — le répertoire a peut-être été déplacé ou supprimé",
       connecting: "De liaison",
       hostOffline: "{{hostName}}est hors ligne",
       cannotReachHost: "Impossible d'atteindre{{hostName}}",