Recreate deleted worktrees from their branch on restore

Archiving a Paseo-owned worktree deletes its directory, so reopening its
agent previously dead-ended even after the workspace record came back —
there was no folder to return to.

Restore now recreates the worktree at its original path from the kept
branch (the branch is never deleted on archive), re-points the same
workspace record, and clears archivedAt — preserving the workspaceId so
the agent stays linked. The directory is recreated before the un-archive
so the reconciler can't re-archive it for a missing directory. A deleted
or already-checked-out branch surfaces a typed failure and leaves the
workspace archived.

Gated behind a worktreeRestore capability flag; older hosts get an
explicit "update your host" state instead of a misleading failure.

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

@@ -335,6 +335,7 @@ export const ar: TranslationResources = {
       cannotReachHost: "لا يمكن الوصول إلى{{hostName}}",
       hostStatus: "حالة Host:{{status}}",
       missing: "لم يتم العثور على Workspace",
+      needsHostUpgrade: "قم بتحديث مضيفك لاستعادة مساحة العمل هذه",
       manageHost: "إدارة المضيف",
     },
     hoverCard: {

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

@@ -335,6 +335,7 @@ export const en = {
       cannotReachHost: "Cannot reach {{hostName}}",
       hostStatus: "Host status: {{status}}",
       missing: "Workspace not found",
+      needsHostUpgrade: "Update your host to restore this workspace",
       manageHost: "Manage host",
     },
     hoverCard: {

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

@@ -339,6 +339,7 @@ export const es: TranslationResources = {
       cannotReachHost: "No se puede alcanzar{{hostName}}",
       hostStatus: "Estado deHost:{{status}}",
       missing: "Workspaceno encontrado",
+      needsHostUpgrade: "Actualiza tu host para restaurar este espacio de trabajo",
       manageHost: "Administrar host",
     },
     hoverCard: {

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

@@ -339,6 +339,7 @@ export const fr: TranslationResources = {
       cannotReachHost: "Impossible d'atteindre{{hostName}}",
       hostStatus: "StatutHost:{{status}}",
       missing: "Workspaceintrouvable",
+      needsHostUpgrade: "Mettez à jour votre hôte pour restaurer cet espace de travail",
       manageHost: "Gérer l'hôte",
     },
     hoverCard: {

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

@@ -338,6 +338,7 @@ export const ru: TranslationResources = {
       cannotReachHost: "Невозможно связаться с{{hostName}}",
       hostStatus: "Статус Host:{{status}}",
       missing: "Workspace не найден",
+      needsHostUpgrade: "Обновите хост, чтобы восстановить эту рабочую область",
       manageHost: "Управление хостом",
     },
     hoverCard: {

packages/app/src/i18n/resources/zh-CN.ts

@@ -335,6 +335,7 @@ export const zhCN: TranslationResources = {
       cannotReachHost: "无法连接 {{hostName}}",
       hostStatus: "Host 状态：{{status}}",
       missing: "Workspace 未找到",
+      needsHostUpgrade: "更新你的 Host 以恢复此 workspace",
       manageHost: "管理 Host",
     },
     hoverCard: {