Add background sync drawer with per-chat progress tracking

[Copilot]

后台同步任务需要在前端可见、可恢复，并同时展示整体进度与当前对话进度。

• Storage & state
  • Persist takeout tasks per session in useSyncTaskStore, aggregate batch progress (all chats) and per-chat progress, and expose running/error tasks for UI.
• Event wiring
  • On takeout:task:progress, upsert tasks into the store; abort now targets all running tasks.
• UI
  • Sync page shows dual progress bars (batch vs current chat) and keeps the background task drawer toggle in the layout.
  • New TaskDrawer lists queued/running/failed tasks with quick dismiss and batch summary.
• i18n & tests
  • Added translations for new task UI strings (EN/zh-CN).
  • New unit test covering session-scoped task persistence and aggregated progress.

Example (task normalization):

function normalizeTask(task: CoreTaskData<'takeout'>): TakeoutTaskView {
  return {
    ...task,
    chatId: task.metadata?.chatIds?.[0],
    createdAt: new Date(task.createdAt).getTime(),
    updatedAt: new Date(task.updatedAt).getTime(),
  }
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/telegram-search/telegram-search/node_modules/.bin/../vite/bin/vite.js build (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/telegram-search/telegram-search/node_modules/.bin/../vitest/vitest.mjs (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/telegram-search/telegram-search/node_modules/.bin/../vitest/vitest.mjs packages/client/src/stores/__test__/useSyncTask.test.ts mkcert bin/�� (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

需要在前端展示后台任务的进度页面（抽屉），同步任务同样也可以放在后台执行。如果是自部署模式启动，重新打开页面也可以恢复当前后台进行的任务的显示。如果同步多个会话，要求可以看到各个正在同步的会话的进度。

后端在同步任务进行的时候，会发送 task:progress，这个时候前端就能拿到状态，可以直接用这个状态显示。

并且，前端需要在当前的同步进度条里面显示两个条，一个是有总对话的数量，一个是当前对话的进度。

具体的 UI 你看着来，总之要简洁。

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