Keep focused agent timelines live and catch up instantly (#2196)

* fix(app): keep focused agent timelines live

Window focus was conflated with app visibility, so switching OS windows could remove the selected timeline subscription. Separate those signals, grace every visibility-driven removal, and cover retained history until authoritative catch-up completes.

* fix(app): keep timeline catch-up failures non-blocking

* fix(app): surface timeline catch-up failures

* fix(app): preserve file preview refocus

* fix(app): preserve optimistic catch-up flow

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

@@ -190,6 +190,7 @@ export const ar: TranslationResources = {
       notFound: "لم يتم العثور على Agent",
       failedToLoad: "فشل تحميل الوكيل",
       reconnecting: "جارٍ إعادة الاتصال...",
+      timelineSyncFailed: "تعذر تحديث سجل الوكيل. جارٍ إعادة المحاولة…",
       archivingTitle: "وكيل الارشيف...",
       archivingSubtitle: "الرجاء الانتظار بينما نقوم بأرشفة هذا الوكيل.",
     },

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

@@ -188,6 +188,7 @@ export const en = {
       notFound: "Agent not found",
       failedToLoad: "Failed to load agent",
       reconnecting: "Reconnecting...",
+      timelineSyncFailed: "Couldn't refresh agent history. Retrying…",
       archivingTitle: "Archiving agent...",
       archivingSubtitle: "Please wait while we archive this agent.",
     },

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

@@ -190,6 +190,7 @@ export const es: TranslationResources = {
       notFound: "Agentno encontrado",
       failedToLoad: "No se pudo cargar el agente",
       reconnecting: "Reconectando...",
+      timelineSyncFailed: "No se pudo actualizar el historial del agente. Reintentando…",
       archivingTitle: "Agente de archivo...",
       archivingSubtitle: "Espere mientras archivamos este agente.",
     },

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

@@ -191,6 +191,7 @@ export const fr: TranslationResources = {
       notFound: "Agentintrouvable",
       failedToLoad: "Échec du chargement de l'agent",
       reconnecting: "Reconnexion...",
+      timelineSyncFailed: "Impossible d’actualiser l’historique de l’agent. Nouvelle tentative…",
       archivingTitle: "Agent d'archivage...",
       archivingSubtitle: "Veuillez patienter pendant que nous archivons cet agent.",
     },

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

@@ -190,6 +190,7 @@ export const ja: TranslationResources = {
       notFound: "エージェントが見つかりません",
       failedToLoad: "エージェントの読み込みに失敗しました",
       reconnecting: "再接続中...",
+      timelineSyncFailed: "エージェントの履歴を更新できませんでした。再試行しています…",
       archivingTitle: "エージェントをアーカイブ中...",
       archivingSubtitle: "このエージェントをアーカイブするまでお待ちください。",
     },

packages/app/src/i18n/resources/pt-BR.ts

@@ -190,6 +190,7 @@ export const ptBR: TranslationResources = {
       notFound: "Agente não encontrado",
       failedToLoad: "Falha ao carregar agente",
       reconnecting: "Reconectando...",
+      timelineSyncFailed: "Não foi possível atualizar o histórico do agente. Tentando novamente…",
       archivingTitle: "Arquivando agente...",
       archivingSubtitle: "Aguarde enquanto arquivamos este agente.",
     },

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

@@ -190,6 +190,7 @@ export const ru: TranslationResources = {
       notFound: "Agent не найден",
       failedToLoad: "Не удалось загрузить агент",
       reconnecting: "Повторное подключение...",
+      timelineSyncFailed: "Не удалось обновить историю агента. Повторная попытка…",
       archivingTitle: "Архивный агент...",
       archivingSubtitle: "Пожалуйста, подождите, пока мы архивируем этого агента.",
     },

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

@@ -190,6 +190,7 @@ export const zhCN: TranslationResources = {
       notFound: "未找到 Agent",
       failedToLoad: "加载 Agent 失败",
       reconnecting: "正在重连...",
+      timelineSyncFailed: "无法刷新代理历史记录。正在重试…",
       archivingTitle: "正在归档 Agent...",
       archivingSubtitle: "请稍候，我们正在归档这个 Agent。",
     },