feat(app): add chat outline navigation (#2792)

* feat(app): add chat outline navigation

Long agent sessions need prompt navigation without coupling viewport movement to disposable server windows. Keep fetched timeline pages in client state so repeated jumps stay local, and settle prompt jumps against virtualized row measurement changes.

* fix(app): preserve chat outline timeline coverage

* fix(app): reconcile outline window submissions

* fix(app): harden outline timeline navigation

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

@@ -190,6 +190,7 @@ export const ru: TranslationResources = {
   agentStream: {
     empty: "Начните общаться с этим агентом...",
     scrollToBottom: "Прокрутить вниз",
+    historyLoadFailed: "Не удалось загрузить историю агента",
     permission: {
       plan: "План",
       required: "Требуется разрешение",
@@ -1817,6 +1818,10 @@ export const ru: TranslationResources = {
       detailLevel: {
         title: "Уровень детализации",
       },
+      chatOutline: {
+        title: "Структура чата",
+        description: "Показывать структуру для перехода между запросами",
+      },
       fonts: {
         title: "Шрифты",
         systemDefault: "Система по умолчанию",