refactor: 视频提取进度实时更新卡片，不再刷日志面板

- 主进程通过 video:progress IPC 推送当前帧数
- 前端监听进度事件，直接更新视频芯片的 meta 文本
- 日志面板只保留开始和完成两条记录

src/main/ipc.ts

@@ -569,15 +569,15 @@ function extractVideoFrames(filePath: string, maxFrames: number, maxWidth: numbe
         });
         child.stderr?.on('data', (data: Buffer) => {
           ffmpegStderr += data.toString();
-          // 实时解析进度 frame=\d+
-          const progressMatch = ffmpegStderr.match(/frame=\s*(\d+)/g);
-          if (progressMatch) {
-            const last = progressMatch[progressMatch.length - 1];
+          // 实时推送进度到渲染进程（每秒一次，覆盖更新）
+          const match = ffmpegStderr.match(/frame=\s*(\d+)/g);
+          if (match) {
+            const last = match[match.length - 1];
             const currentFrame = parseInt(last.replace(/\D/g, ''));
             if (currentFrame > lastProgressFrame && Date.now() - lastProgressTime > 1000) {
               lastProgressFrame = currentFrame;
               lastProgressTime = Date.now();
-              sendLog('debug', `🎬 提取进度`, `${currentFrame} 帧`);
+              mainWindow?.webContents.send('video:progress', { current: currentFrame });
             }
           }
         });

src/main/preload.ts

@@ -127,6 +127,12 @@ contextBridge.exposeInMainWorld('metonaDesktop', {
   },
   video: {
     extractFrames: (filePath: string, options?: { maxFrames?: number; maxWidth?: number; maxSize?: number }) =>
-      ipcRenderer.invoke('video:extractFrames', filePath, options)
+      ipcRenderer.invoke('video:extractFrames', filePath, options),
+    onProgress: (callback: (data: { current: number }) => void) => {
+      ipcRenderer.on('video:progress', (_: unknown, data: { current: number }) => callback(data));
+    },
+    removeProgressListener: () => {
+      ipcRenderer.removeAllListeners('video:progress');
+    }
   }
 });