refactor: 用 StopFailure 事件替代定时轮询，移除空闲检测定时器

- 移除 heartbeat 空闲检测机制（PreToolUse 空 matcher）
- 新增 StopFailure hooks 处理 API 错误中断场景
- PostToolUse 仅保留 Edit（Write 通过 PreToolUse 快照实现）
- 移除 extension.ts 中 idleTimer/idleCooldown/heartbeatWatcher
- 更新 README hooks 配置文档
- 添加 MIT LICENSE

src/extension.ts

@@ -30,6 +30,10 @@ export function activate(context: vscode.ExtensionContext) {
   hookHandler = new HookHandler(changeSetManager, diffViewer);
   statusBar = new StatusBarManager(changeSetManager, diffViewer);
 
+  // ★ 设置 hook 目录路径，供 snapshotManager 读取 PreToolUse 快照
+  const hookDir = getHookDir();
+  if (hookDir) changeSetManager.setHookDir(hookDir);
+
   // DiffViewer 操作后刷新状态栏
   diffViewer.onDiffAction = () => refreshUI();
 
@@ -95,6 +99,24 @@ function registerCommands(context: vscode.ExtensionContext) {
     vscode.commands.registerCommand(COMMANDS.PREV_DIFF, () => navigateDiff(-1))
   );
 
+  // ★ 逐次编辑导航
+  context.subscriptions.push(
+    vscode.commands.registerCommand('aiDiffPreview.nextEdit', () => diffViewer.showNextEdit())
+  );
+  context.subscriptions.push(
+    vscode.commands.registerCommand('aiDiffPreview.prevEdit', () => diffViewer.showPrevEdit())
+  );
+  context.subscriptions.push(
+    vscode.commands.registerCommand('aiDiffPreview.showEditAtIndex', () => {
+      const session = diffViewer.getActiveSession();
+      if (session) {
+        const set = changeSetManager.getCurrentSet();
+        const fc = set?.changes.find(c => c.id === session.fileId);
+        if (fc) diffViewer.showEditAtIndex(fc, 0);
+      }
+    })
+  );
+
   // Diff 界面状态栏按钮
   context.subscriptions.push(
     vscode.commands.registerCommand('aiDiffPreview.acceptCurrentDiff', async () => {
@@ -150,6 +172,14 @@ function refreshUI(): void {
   vscode.commands.executeCommand('setContext', 'aiDiffPreview.isActive', hasPending);
 }
 
+// ---- Hook 目录 ----
+
+function getHookDir(): string | null {
+  const folder = vscode.workspace.workspaceFolders?.[0];
+  if (!folder) return null;
+  return path.join(folder.uri.fsPath, '.claude', 'hooks');
+}
+
 // ---- Hook 监听 ----
 
 function registerHookFileWatcher(context: vscode.ExtensionContext) {
@@ -160,11 +190,13 @@ function registerHookFileWatcher(context: vscode.ExtensionContext) {
   if (!fs.existsSync(hookDir)) fs.mkdirSync(hookDir, { recursive: true });
 
   const pendingFile = path.join(hookDir, 'pending.json');
-  const watcher = vscode.workspace.createFileSystemWatcher(
+
+  // ★ 监听 pending.json（Edit/Stop/StopFailure 事件）
+  const pendingWatcher = vscode.workspace.createFileSystemWatcher(
     new vscode.RelativePattern(hookDir, 'pending.json')
   );
 
-  const handle = () => {
+  const handlePending = () => {
     try {
       if (!fs.existsSync(pendingFile)) return;
       const content = fs.readFileSync(pendingFile, 'utf-8');
@@ -172,18 +204,20 @@ function registerHookFileWatcher(context: vscode.ExtensionContext) {
       const event: ClaudeHookEvent = JSON.parse(content);
       if (Date.now() - event.timestamp > 10000) return;
 
-      if (event.toolName === 'Stop') {
+      if (event.toolName === 'Stop' || event.toolName === 'StopFailure') {
+        // ★ 对话结束（正常完成或 API 失败）→ 触发 diff 总览
         hookHandler.handleStop();
-      } else if (event.toolName === 'Edit' || event.toolName === 'Write') {
+      } else if (event.toolName === 'Edit') {
         hookHandler.handleEdit(event);
       }
       refreshUI();
-    } catch (e) { console.error('[AI Diff] 处理触发文件失败:', e); }
+    } catch (e) { console.error('[AI Diff] 处理 pending 文件失败:', e); }
   };
 
-  watcher.onDidChange(handle);
-  watcher.onDidCreate(handle);
-  context.subscriptions.push(watcher);
+  pendingWatcher.onDidChange(handlePending);
+  pendingWatcher.onDidCreate(handlePending);
+  context.subscriptions.push(pendingWatcher);
+
   console.log(`[AI Diff] Hook 监听已启动: ${hookDir}`);
 }
 
@@ -199,8 +233,8 @@ function checkPendingHookFile() {
     fs.unlinkSync(pendingFile);
     const event: ClaudeHookEvent = JSON.parse(content);
     if (Date.now() - event.timestamp < 15000) {
-      if (event.toolName === 'Stop') hookHandler.handleStop();
-      else if (event.toolName === 'Edit' || event.toolName === 'Write') hookHandler.handleEdit(event);
+      if (event.toolName === 'Stop' || event.toolName === 'StopFailure') hookHandler.handleStop();
+      else if (event.toolName === 'Edit') hookHandler.handleEdit(event);
       refreshUI();
     }
   } catch (e) { console.error('[AI Diff] 处理 pending hook 失败:', e); }