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后台任务输出日志在打开的标签页内自动跟随磁盘变化刷新 - #775
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The task strip's "Output" button opens the task log through openFilePreview, but the log lives under the OS temp root, outside every notify-watched workspace root, so the open-tab watcher never sees it change. A null-rendering leaf component now polls the active, clean output tab every 2 s while its task is live and routes changes through applyExternalReload; the interval stops as soon as the task settles, the tab closes, or the buffer turns dirty.
…-reload Keep the strip's new agentName prop alongside the null-rendering LiveOutputFileWatcher in one fragment, and type the test helper's overrides as Partial<FileLikeWorkspaceTab> now that FileWorkspaceTab is a discriminated union with a browser variant.
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本分支已合并最新 main（5c03d7af），冲突已解决（b867f979）： 合并后本地验证：tsc、eslint、prettier 干净， @xintaofei 已处于可合并状态，请审查。 |
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背景
后台任务执行时，界面上会有一个提醒条，条上的"输出"按钮通过 openFilePreview 打开任务日志，而日志写在系统临时目录，这个目录不属于任何已注册的工作区根目录，后端文件监听听不到它。所以，标签页一旦打开，内容不会随着文件变动而更新。已有的文件检查只在切换标签页那一刻运行，用户如果保留日志页在界面上，永远就看不到新的内容。
改动
新增组件 LiveOutputFileWatcher，挂在 conversation-shell.tsx 的 AsyncTaskStrip 旁边，它自身不渲染任何界面。任务还在执行时，如果界面上打开的正是这个任务的日志标签页，而且标签页没有未保存的修改、不在保存中、也不是图片或 Office 预览，组件就每 2 秒拿 etag 比对一次标签页与磁盘上的文件。
比对发现文件变了，走 applyExternalReload 把新内容写进标签页。这条路径自带代数检查，不会覆盖用户没保存的内容，也会刷新 git 基线，正合适。读不到文件（最常见是日志被清理掉了）就走 rejectFileTab，把错误显示在标签页上。任务结束、用户关闭标签页或者开始编辑，定时器随即拆掉，不再跟随。
组件单独挂载：fileTabs 这份高频变动的状态只触发本组件空渲染，不会牵动会话外壳。
验证
pnpm test全量：764 个测试文件、11363 个测试通过（合入最新 main 后复跑）。取舍
为什么用轮询而不是文件系统监听：后端现有的 notify 监听器有已知的事件丢失问题，src-tauri/src/workspace_state/mod.rs:1590 的注释记载 macOS FSEvents 会丢事件，加了监听也要靠轮询兜底。现在的轮询只在任务还在执行、日志页显示在最前、没有未保存修改时才跑，空闲时几乎没有开销。