fix: 修复 TypeScript 类型错误

- 移除 MediaStream.tracks 属性访问（已被移除的 API）
- 仅使用标准的 getTracks() 方法

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/core/audio-recorder.ts

@@ -229,7 +229,7 @@ export class AudioRecorder extends EventEmitter {
       log(LogLevel.DEBUG, 'MediaStreamSource 已断开');
     }
     if (this.stream) {
-      const tracks = this.stream.getTracks?.() || this.stream.tracks || [];
+      const tracks = this.stream.getTracks?.() || [];
       tracks.forEach((track: any) => track.stop?.());
       this.stream = null;
       log(LogLevel.DEBUG, '媒体流已停止');

src/electron-main.ts

@@ -151,6 +151,13 @@ ipcMain.handle('save-settings', async (_event: any, settings: Record<string, unk
   return { success };
 });
 
+ipcMain.handle('list-audio-devices', async () => {
+  logger.info('IPC: 请求音频设备列表');
+  // 设备列表需要在渲染进程中获取
+  // 返回一个标记，让渲染进程自行获取
+  return { available: true };
+});
+
 // 所有窗口关闭时退出应用
 app.on('window-all-closed', () => {
   logger.info('所有窗口已关闭，退出应用');

src/preload.ts

@@ -22,6 +22,9 @@ contextBridge.exposeInMainWorld('electronAPI', {
   // 文件检查
   checkFileExists: (path: string) => ipcRenderer.invoke('check-file-exists', path),
 
+  // 设备列表
+  listAudioDevices: () => ipcRenderer.invoke('list-audio-devices'),
+
   // 事件监听
   onToggleRecording: (callback: () => void) => {
     ipcRenderer.on('toggle-recording', () => callback());