feat: 新增内置 tab「文件追踪」——会话文件操作记录与逐行 diff（移植 dsh-file-trace）

README.md

@@ -55,7 +55,7 @@
 - **⚡ 按需加载**：启动只拉 ~325KB 核心，终端 / 编辑器 / Mermaid 图表等重依赖用到才按需拉取（[设计文档](docs/plans/2026-08-12-lazy-chunks-design.md)）
 - **🌏 多语言**：界面文案跟随 DSH 语言（zh / en）实时切换；安装 `@huanlin/dsh-plugin-better-locale` 后支持日语（ja）等第三语言覆盖（见下方「🌏 第三语言覆盖」）
 
-> 🔌 **核心理念**：服务优先——内置的 7 tab + 6 viewer 与第三方插件通过同一套 `ctx.betterSidebar` API 注册，能力完全对等；官方不再内置、可由生态提供的功能，交由生态插件实现（已有 **28+ 生态插件**，见下方「🌐 插件生态」）。接入文档见「🔌 服务化扩展」与 [外部插件接入指南](./docs/external-plugin-guide.md)。
+> 🔌 **核心理念**：服务优先——内置的 8 tab + 6 viewer 与第三方插件通过同一套 `ctx.betterSidebar` API 注册，能力完全对等；官方不再内置、可由生态提供的功能，交由生态插件实现（已有 **28+ 生态插件**，见下方「🌐 插件生态」）。接入文档见「🔌 服务化扩展」与 [外部插件接入指南](./docs/external-plugin-guide.md)。
 
 ## 🚀 安装
 
@@ -165,11 +165,12 @@ dsh registry enable dsh-external/dsh-better-sidebar
 | **💻 真实终端**<br/><sub>xterm.js + node-pty 真实 shell（不是模拟器）：断线重连 transcript 回放、shell / shellArgs 可配置（设置页或 `cordis.patch.yml`）、可选为模型注入 `terminal_*` 工具（agent 可直接开终端跑命令）。</sub><br/><div align="center"><img width="420" alt="真实终端" src="https://github.com/user-attachments/assets/0dad6ad3-ff3f-4b5a-86d2-f832ce65323e" /></div> | **🌿 Git 面板**<br/><sub>暂存 / 取消暂存 / 提交（`Ctrl+Enter`）/ 还原，历史列表；点击改动文件打开 **VSCode 式 diff tab**（红绿行级对比）。</sub><br/><div align="center"><img width="420" alt="Git 面板" src="https://github.com/user-attachments/assets/e7fc1220-305f-4bca-8583-e77ab4f4fa78" /></div> |
 | **🌐 内嵌浏览器**<br/><sub>多开网页 tab：后退 / 前进 / 刷新 / 地址栏；内容运行在**不透明源沙箱 iframe**（界面实时显示沙箱状态，可按页面临时解锁）；聊天里的外链点击可被接管到侧边栏打开（按协议分流，可配）。</sub><br/><div align="center"><img width="420" alt="内嵌浏览器" src="https://github.com/user-attachments/assets/9bc6b65a-64fc-4942-a685-76e391e55606" /></div> | **🧩 任务页：子代理拓扑 + 后台任务**<br/><sub>子代理树实时拓扑（运行状态、批量实时预览）+ 后台任务清单（退出码 / 实时输出 / 强制终止）；新子代理 / 新任务可自动展开侧边栏（可关）。</sub><br/><div align="center"><img width="420" alt="任务页：子代理拓扑" src="https://github.com/user-attachments/assets/dcd8ed2f-59fa-405b-937b-2d250f5034dd" /></div> |
 | **💬 侧边对话(beta)**<br/><sub>Codex 风格侧边线程：**每个对话一个独立 Tab**；线程继承主会话完整上下文（含进行中回合，以 interrupted 诚实冻结）独立运行，不污染主会话；可持续追问、重启冷恢复；一键「保存为新会话」提升为顶层会话。</sub><br/><div align="center"><img width="420" alt="侧边对话(beta)" src="https://github.com/user-attachments/assets/3a338c36-f5de-4000-95f3-4b1cd04f60fc" /></div> | **🪟 双工作台：右侧栏 + 底部面板 + 分栏**<br/><sub>右侧栏与底部面板可同时展开；拖 Tab 到分栏边缘**拆分**、拖到中间**合并**（可跨面板）；面板宽高左缘/上缘拖拽调节；移动端自动合并为全宽抽屉；把 tab 拖到主会话区域可变为**自由窗口**（悬浮 / 缩放 / 置顶，拖回 pane 停靠）。</sub><br/><div align="center"><img width="420" alt="双工作台（右侧栏 + 底部面板）" src="https://github.com/user-attachments/assets/dfdb875e-a1a8-4d4b-8340-353736b1708f" /></div> |
+| **📜 文件追踪**<br/><sub>记录模型在本会话读 / 写 / 编辑过的每一个文件（读取会话事件日志实时折叠），按文件分组、带操作数角标；点开任意操作查看**行级 diff**（删红 / 增绿 / 改蓝 + 行内字符级高亮）或带真实行号的读取视图，常见语言**语法着色**（关键字 / 字符串 / 数字 / 类型 / 函数 / 注释 / 预处理，跨行块注释正确），失败操作直接展示真实错误文本，长行与未变更区间可折叠。移植自独立插件 [dsh-file-trace](https://github.com/lhh010/dsh-file-trace)（仍独立维护，二者可共存；本内置 tab 可在设置页整体关闭）。</sub> |
 | **⚙️ 声明式设置**<br/><sub>设置页「侧边卡片」分区：每个 tab / 预览器一张小卡片，独立开关（高亮启用态 + 品牌开关滑块）；二级设置经卡片底部「功能设置」条弹窗（开关 / 文本 / 数字 / 下拉）；插件自有设置持久化在 `pluginSettings`。</sub><br/><div align="center"><img width="420" alt="声明式设置：侧边卡片" src="https://github.com/user-attachments/assets/0800ca64-621e-48da-b7df-aecfddc3ec29" /></div> | **📱 移动端**<br/><sub>窄屏（<768px）自动切换为全宽抽屉：底栏 tab 一次性并入右侧栏，触屏拖拽可调。</sub><br/><div align="center"><img width="360" alt="移动端全宽抽屉" src="https://github.com/user-attachments/assets/a82ba78a-f4cf-4d85-80e8-050a05beb144" /></div> |
 
 ## 🌐 插件生态
 
-`ctx.betterSidebar` 服务向所有插件开放两个扩展点：**`registerTab`（注册侧边栏页面）** 与 **`registerFileViewer`（注册文件预览器）**。内置的 7 tab + 6 viewer 与第三方插件走同一套 API，能力完全对等。
+`ctx.betterSidebar` 服务向所有插件开放两个扩展点：**`registerTab`（注册侧边栏页面）** 与 **`registerFileViewer`（注册文件预览器）**。内置的 8 tab + 6 viewer 与第三方插件走同一套 API，能力完全对等。
 
 ```ts
 import type {} from 'dsh-better-sidebar'  // 触发 ctx.betterSidebar 类型合并
@@ -459,7 +460,7 @@ GitHub topic [`dsh-better-sidebar`](https://github.com/topics/dsh-better-sidebar
 
 ## 🔌 服务化扩展
 
-从 v0.4.0 起暴露 `ctx.betterSidebar` 服务，其他插件可注册侧边栏页面与文件预览器（内置 7 tab + 6 viewer 亦通过同一服务注册）。v0.12.1 补齐基座能力（完整类型导出、能力探测、状态订阅、tab 角标、生命周期回调、定向打开、插件自有设置等）。
+从 v0.4.0 起暴露 `ctx.betterSidebar` 服务，其他插件可注册侧边栏页面与文件预览器（内置 8 tab + 6 viewer 亦通过同一服务注册）。v0.12.1 补齐基座能力（完整类型导出、能力探测、状态订阅、tab 角标、生命周期回调、定向打开、插件自有设置等）。
 
 完整接入文档（全字段、匹配算法、HMR 陷阱、声明式设置、版本探测、自由窗口与皮肤契约）：**[`docs/external-plugin-guide.md`](./docs/external-plugin-guide.md)**；仓库开发规则（硬约束 / CI / 发版）见 [`AGENTS.md`](./AGENTS.md)。
 

README_EN.md

@@ -55,7 +55,7 @@
 - **⚡ On-demand Loading**: only ~325KB core at startup; heavy deps (terminal / editor / mermaid diagrams) load on demand ([design](docs/plans/2026-08-12-lazy-chunks-design.md))
 - **🌏 i18n**: UI text follows DSH's language (zh / en) with live switching; with the optional `@huanlin/dsh-plugin-better-locale` peer, 19 third-language overlays (ja / de / fr / …) are available
 
-> 🔌 **Core principle**: service-first — the 7 built-in tabs + 6 viewers register through the same `ctx.betterSidebar` API as third-party plugins, with fully equal capabilities; anything the ecosystem can provide better is delegated to ecosystem plugins (**28+ ecosystem plugins** already — see "🌐 Plugin Ecosystem" below). See "🔌 Service API" and the [external plugin guide](./docs/external-plugin-guide.md).
+> 🔌 **Core principle**: service-first — the 8 built-in tabs + 6 viewers register through the same `ctx.betterSidebar` API as third-party plugins, with fully equal capabilities; anything the ecosystem can provide better is delegated to ecosystem plugins (**28+ ecosystem plugins** already — see "🌐 Plugin Ecosystem" below). See "🔌 Service API" and the [external plugin guide](./docs/external-plugin-guide.md).
 
 ## 🚀 Installation
 
@@ -165,11 +165,12 @@ Update: `git pull && pnpm install && pnpm build` → `node scripts/package-regis
 | **💻 Real Terminal**<br/><sub>xterm.js + node-pty real shell (not an emulator): transcript replay on reconnect, configurable shell / shellArgs (settings page or `cordis.patch.yml`), and optional `terminal_*` model tools so the agent can open terminals and run commands itself.</sub><br/><div align="center"><img width="420" alt="Real terminal" src="https://github.com/user-attachments/assets/0dad6ad3-ff3f-4b5a-86d2-f832ce65323e" /></div> | **🌿 Git Panel**<br/><sub>Stage / unstage / commit (`Ctrl+Enter`) / revert, plus a history list; clicking a changed file opens a **VSCode-style diff tab** (line-level red/green).</sub><br/><div align="center"><img width="420" alt="Git panel" src="https://github.com/user-attachments/assets/e7fc1220-305f-4bca-8583-e77ab4f4fa78" /></div> |
 | **🌐 Embedded Browser**<br/><sub>Multiple web tabs with back / forward / reload / address bar; content runs in an **opaque-origin sandboxed iframe** (live sandbox status in the UI, per-page temporary unlock available); external-link clicks in the chat can be taken over into the sidebar (protocol-based routing, configurable).</sub><br/><div align="center"><img width="420" alt="Embedded browser" src="https://github.com/user-attachments/assets/9bc6b65a-64fc-4942-a685-76e391e55606" /></div> | **🧩 Tasks: Agent Topology + Background Jobs**<br/><sub>Live subagent-tree topology (run states, batched live previews) plus the background-jobs list (exit codes / live output / force-kill); new subagents / jobs can auto-expand the sidebar (configurable).</sub><br/><div align="center"><img width="420" alt="Tasks: subagent topology" src="https://github.com/user-attachments/assets/dcd8ed2f-59fa-405b-937b-2d250f5034dd" /></div> |
 | **💬 Side Chat (beta)**<br/><sub>Codex-style side threads: **one independent tab per conversation**; the thread inherits the parent's full context (including the in-progress turn, honestly frozen as "interrupted") and runs independently without polluting the main session; follow-ups survive restarts; one click promotes the thread to a top-level session.</sub><br/><div align="center"><img width="420" alt="Side Chat (beta)" src="https://github.com/user-attachments/assets/3a338c36-f5de-4000-95f3-4b1cd04f60fc" /></div> | **🪟 Dual Workbench: Sidebar + Bottom Panel + Split Panes**<br/><sub>The right sidebar and the bottom panel can stay open together; drag a tab to a pane edge to **split**, to the middle to **merge** (works across panels); panel width/height drag from the left/top edge; on mobile everything merges into a full-width drawer; drag a tab onto the main conversation area to turn it into a **free window** (float / resize / raise, drag back onto a pane to dock).</sub><br/><div align="center"><img width="420" alt="Dual workbench (right sidebar + bottom panel)" src="https://github.com/user-attachments/assets/dfdb875e-a1a8-4d4b-8340-353736b1708f" /></div> |
+| **📜 File Trace**<br/><sub>Records every file the model read, wrote, or edited in this session (folded live from the session event log), grouped by file with an op-count badge; open any op for a **line diff** (del red / add green / mod blue + intra-line character highlighting) or the line-numbered read view, with lightweight **syntax coloring** for common languages (keywords / strings / numbers / types / functions / comments / preprocessor, multi-line block comments included); failed ops show their real error text, and long lines and unchanged regions fold. Ported from the standalone [dsh-file-trace](https://github.com/lhh010/dsh-file-trace) plugin (still maintained independently; both can coexist — this built-in tab can be turned off in settings).</sub> |
 | **⚙️ Declarative Settings**<br/><sub>The "Side card" section in DSH settings: one small card per tab / viewer with an independent toggle (highlighted enabled state + brand switch); secondary settings open from the "Feature settings" strip at the card bottom (switch / text / number / select rows); plugin-owned settings persist under `pluginSettings`.</sub><br/><div align="center"><img width="420" alt="Declarative settings: side cards" src="https://github.com/user-attachments/assets/0800ca64-621e-48da-b7df-aecfddc3ec29" /></div> | **📱 Mobile**<br/><sub>On narrow screens (<768px) the panels become a full-width drawer: bottom-panel tabs merge into the sidebar once, with touch-friendly dragging.</sub><br/><div align="center"><img width="360" alt="Mobile full-width drawer" src="https://github.com/user-attachments/assets/a82ba78a-f4cf-4d85-80e8-050a05beb144" /></div> |
 
 ## 🌐 Plugin Ecosystem
 
-The `ctx.betterSidebar` service opens two extension points to every plugin: **`registerTab` (sidebar pages)** and **`registerFileViewer` (file previewers)**. The 7 built-in tabs + 6 viewers register through the exact same API — fully equal capabilities.
+The `ctx.betterSidebar` service opens two extension points to every plugin: **`registerTab` (sidebar pages)** and **`registerFileViewer` (file previewers)**. The 8 built-in tabs + 6 viewers register through the exact same API — fully equal capabilities.
 
 ```ts
 import type {} from 'dsh-better-sidebar'  // triggers the ctx.betterSidebar type merge
@@ -455,7 +456,7 @@ All changes since v0.14.0:
 
 ## 🔌 Service API
 
-Since v0.4.0 the plugin exposes the `ctx.betterSidebar` service — other plugins can register sidebar pages and file viewers (the 7 built-in tabs + 6 viewers register through the same service). v0.12.1 completed the base capabilities (complete type exports, capability detection, state subscription, tab badges, lifecycle callbacks, targeted open, plugin-owned settings, etc.).
+Since v0.4.0 the plugin exposes the `ctx.betterSidebar` service — other plugins can register sidebar pages and file viewers (the 8 built-in tabs + 6 viewers register through the same service). v0.12.1 completed the base capabilities (complete type exports, capability detection, state subscription, tab badges, lifecycle callbacks, targeted open, plugin-owned settings, etc.).
 
 Full integration docs (complete fields, matching algorithm, HMR pitfalls, declarative settings, version detection, float windows and the skinning contract): **[`docs/external-plugin-guide.md`](./docs/external-plugin-guide.md)**; repository rules (hard constraints / CI / release) live in [`AGENTS.md`](./AGENTS.md).
 

docs/external-plugin-guide.md

@@ -3,7 +3,7 @@
 > 面向 **消费插件开发者**：如何让你的插件向 better-sidebar 注册新的侧边栏页面（tab）和文件类型预览器。
 >
 > 适用版本：**v0.4.0+**（`ctx.betterSidebar` 服务）；声明式设置 **v0.4.1+**；text/number 设置行 **v0.11.0+**；badge/生命周期/定向打开/插件设置/版本探测 **v0.12.0+**；select 设置行（`settingSelect`）与外链认领（`urlTarget`）**v0.13.0+**；统一 `@deepseek-ai/cordis` 类型基底 **v0.15.2+**；自由窗口（`floatWindows`）**v0.16.0+**；终端固定（pin）**v0.17.0+**。当前版本 **v0.18.0-alpha.0**（alpha 通道，仅支持 DSH 0.1.2-alpha.x；stable 线为 v0.17.1）。
-> 权威代码：`src/client/service.ts`（服务实现）、`src/client/builtins/`（内置 7 tab + 6 viewer 参考实现）、`lib/types/client/service.d.ts`（类型声明）。
+> 权威代码：`src/client/service.ts`（服务实现）、`src/client/builtins/`（内置 8 tab + 6 viewer 参考实现）、`lib/types/client/service.d.ts`（类型声明）。
 > 仓库开发规则（硬约束 / CI / 发版）见 [AGENTS.md](../AGENTS.md)。
 
 ---
@@ -15,7 +15,7 @@ better-sidebar 从 v0.4.0 起把自己改造成一个**注册表服务**：
 - **新页面（tab）**：注册一种新的侧边栏 tab 类型，出现在侧边栏 `+` 菜单里，用户点击后在自己的分栏里打开你的 React 页面；
 - **文件预览器（file viewer）**：注册一种文件类型预览器，让用户在侧边栏打开文件时走你的渲染组件（覆盖或补充内置的 image/pdf/code 等）。
 
-内置的 7 个 tab（editor / git / subagent / sidechat / terminal / browser / diff）和 6 个 viewer（image / pdf / markdown / html / code / binary-download）**自己也是通过同一套 API 注册的**（吃自己的狗粮），所以外部插件的能力与内置功能完全对等。
+内置的 8 个 tab（editor / git / subagent / sidechat / terminal / browser / file-trace / diff）和 6 个 viewer（image / pdf / markdown / html / code / binary-download）**自己也是通过同一套 API 注册的**（吃自己的狗粮），所以外部插件的能力与内置功能完全对等。
 
 关键机制一句话：better-sidebar 的 client half 在 `apply()` 开头执行 `ctx.provide('betterSidebar', service)`（`src/client/index.tsx`），消费插件在 `inject` 里声明 `'betterSidebar'`，Cordis 保证服务就绪后才激活你的插件，然后你调用 `ctx.betterSidebar.registerTab(...)` / `registerFileViewer(...)` 完成注册，返回的 disposer 由 Cordis fiber 在卸载（HMR / 禁用）时自动调用。
 
@@ -157,7 +157,7 @@ interface TabDescriptor {
   title: string | (() => string)
   /** 图标：ReactNode 或 (size: number) => ReactNode */
   icon?: ReactNode | ((size: number) => ReactNode)
-  /** + 菜单排序（升序）；默认 100。内置：editor=10, git=20, subagent=30, sidechat=35, terminal=40, browser=50 */
+  /** + 菜单排序（升序）；默认 100。内置：editor=10, git=20, subagent=30, sidechat=35, terminal=40, browser=50, file-trace=55=50 */
   order?: number
   /** 从 + 菜单隐藏（editor/diff 用：由其他流程触发打开，不在菜单里） */
   hidden?: boolean

src/client/builtins/tabs.tsx

@@ -1,6 +1,7 @@
 /**
- * The 7 built-in tab descriptors: the plugin registers its own pages
- * (editor / git / subagent / sidechat / terminal / browser / diff) through
+ * The 8 built-in tab descriptors: the plugin registers its own pages
+ * (editor / git / subagent / sidechat / terminal / browser / diff /
+ * file-trace) through
  * the same {@link BetterSidebarService} external plugins use — eating its
  * own dogfood. The terminal descriptor owns its quota (`TERMINAL_LIMIT`)
  * and mints `terminal:<uuid>` ids through `createTab`; the browser mints
@@ -21,7 +22,9 @@ import { SubagentView } from '../SubagentView.tsx'
 import { consumeSidechatSeed, SideChatView, sidechatThreadIdOf } from '../SideChatView.tsx'
 import { api } from '../api.ts'
 import { BrowserView } from '../BrowserView.tsx'
-import { IconTerminalOutline16, IconDiffOutline16, IconGlobeOutline16 } from '../icons.tsx'
+import { IconTerminalOutline16, IconDiffOutline16, IconGlobeOutline16, IconHistoryOutline16 } from '../icons.tsx'
+import { FileTraceTab } from '../filetrace/FileTraceTab.tsx'
+import { extractFileOps } from '../filetrace/ops.ts'
 import { TERMINAL_FONT_SIZE_MAX, TERMINAL_FONT_SIZE_MIN } from '../../prefs-shared.ts'
 import type { ComponentType } from 'react'
 import type { SessionScope } from '../api.ts'
@@ -335,6 +338,18 @@ export function builtinTabs(ctx: Context, options: BuiltinTabOptions = {}): read
       }),
       component: (props) => <BrowserView {...props} />,
     },
+    {
+      id: 'file-trace',
+      title: () => t('fileTrace'),
+      icon: (size: number) => <IconHistoryOutline16 size={size} />,
+      order: 55,
+      single: true,
+      badge: (ctx, scope) => {
+        const events = ctx.sessions.get(scope.sessionId)?.events
+        return events === undefined ? null : extractFileOps(events).length
+      },
+      component: (props) => <FileTraceTab {...props} />,
+    },
     {
       id: 'diff',
       title: () => t('git'),