✨ feat(vscode): 代码阅读侧栏加「未提交的更改」筛选

- 标题栏新按钮「未提交的更改」：树里只剩工作区各 git 仓库里没提交的文件（暂存、没暂存、未跟踪、合并冲突），每个有改动的仓库一个根，跟着 git 状态自动重摆；上色和徽标交给 VS Code 自带的 git 装饰
- 两种筛选互斥，由 TreeFilters 统一管，上下文键合并成 superpowers.codeReader.filter（review / uncommitted）
- 改动文件树改成多根，buildChangedTree 挪到 explorer/changedTree 并改吃 {path, change}
- 内置 git 扩展 API 的类型和加载抽到 src/git/gitApi、gitExtension，提交按钮的监听也改用它
- 文件注释按文件所在的工作区文件夹记，不看树从哪个根摆下来

vscode/src/panel/handlers/toolbar.ts

@@ -1,47 +1,19 @@
-import type { Uri } from 'vscode'
+import type { GitRepository } from '../../git/gitApi'
 import type { KanbanWebviewPanel } from '../KanbanPanel'
 import { accessSync, constants } from 'node:fs'
 import * as path from 'node:path'
-import { extensions, workspace } from 'vscode'
+import { workspace } from 'vscode'
 import { resolveCommitProfileForRun } from '../../cc/commitProfile'
 import { resolveProfilePath } from '../../cc/profiles'
 import { spawnClaude } from '../../cc/spawnClaude'
 import { findEnvFiles, lockEnvFiles, unlockEnvFiles } from '../../files/envLock'
+import { loadGitApi } from '../../git/gitExtension'
 import { missingGitIdentityKeys, readGitIdentity } from '../../git/identity'
 import { logger } from '../../logging/logger'
 import { getEffectiveCommitProfilePath } from '../../settings/store'
 import { makeNonce } from '../../webview/html'
 import { dismiss, toast } from './handoffFlow'
 
-/**
- * Minimal structural typing for the bits of the built-in `vscode.git`
- * extension API we consume to observe working-tree state.
- * Reference: microsoft/vscode → extensions/git/src/api/git.d.ts
- */
-interface GitExtensionApiRepositoryStateChange {
-  (listener: () => unknown): { dispose: () => void }
-}
-
-interface GitExtensionApiRepositoryState {
-  readonly workingTreeChanges: ReadonlyArray<{ uri: Uri }>
-  readonly indexChanges: ReadonlyArray<{ uri: Uri }>
-  readonly untrackedChanges?: ReadonlyArray<{ uri: Uri }>
-  readonly onDidChange: GitExtensionApiRepositoryStateChange
-}
-
-interface GitExtensionApiRepository {
-  readonly rootUri: Uri
-  readonly state: GitExtensionApiRepositoryState
-}
-
-interface GitExtensionApi {
-  readonly repositories: ReadonlyArray<GitExtensionApiRepository>
-}
-
-interface GitExtensionExports {
-  getAPI: (version: 1) => GitExtensionApi
-}
-
 export async function handleCommitRun(panel: KanbanWebviewPanel): Promise<void> {
   if (panel.commitRunning)
     return
@@ -266,26 +238,20 @@ export function setupGitWatcher(panel: KanbanWebviewPanel): void {
   if (!wsRoot)
     return
 
-  const gitExt = extensions.getExtension<GitExtensionExports>('vscode.git')
-  if (!gitExt) {
-    logger.add({
-      level: 'warn',
-      source: 'panel',
-      message: 'vscode.git 扩展未找到，提交按钮将持续显示',
-    })
-    // Fallback: keep the button visible so users can at least trigger
-    // commits manually even though we can't observe state.
-    updateHasChanges(panel, true)
-    return
-  }
+  void loadGitApi().then((api) => {
+    if (!api) {
+      logger.add({
+        level: 'warn',
+        source: 'panel',
+        message: 'vscode.git 扩展没装或被禁用，提交按钮将持续显示',
+      })
+      // Fallback: keep the button visible so users can at least trigger
+      // commits manually even though we can't observe state.
+      updateHasChanges(panel, true)
+      return
+    }
 
-  const activation = gitExt.isActive
-    ? Promise.resolve(gitExt.exports)
-    : Promise.resolve(gitExt.activate())
-
-  void activation.then((exports) => {
-    const api = exports.getAPI(1)
-    const findRepo = (): GitExtensionApiRepository | undefined =>
+    const findRepo = (): GitRepository | undefined =>
       api.repositories.find(r => r.rootUri.fsPath === wsRoot)
 
     const updateState = (): void => {
@@ -297,11 +263,11 @@ export function setupGitWatcher(panel: KanbanWebviewPanel): void {
       const total
         = repo.state.workingTreeChanges.length
           + repo.state.indexChanges.length
-          + (repo.state.untrackedChanges?.length ?? 0)
+          + repo.state.untrackedChanges.length
       updateHasChanges(panel, total > 0)
     }
 
-    const subscribe = (repo: GitExtensionApiRepository): void => {
+    const subscribe = (repo: GitRepository): void => {
       panel.gitStateDisposable = repo.state.onDidChange(updateState)
     }