Fix UI freeze by using MediaStreamTrackProcessor for audio capture (restored PCM)

src/preload/index.ts

@@ -1,8 +1,20 @@
 import { contextBridge, ipcRenderer } from 'electron'
 import { electronAPI } from '@electron-toolkit/preload'
 
-// Custom APIs for renderer
-const api = {}
+// Custom APIs for renderer - extend with explicit audio/video IPC
+const api = {
+    // Explicitly expose receive channels for media
+    onAudioFragment: (callback: (payload: any) => void) => {
+        const handler = (_: any, payload: any) => callback(payload);
+        ipcRenderer.on('audio-fragment', handler);
+        return () => ipcRenderer.removeListener('audio-fragment', handler);
+    },
+    onVideoChunk: (callback: (payload: any) => void) => {
+        const handler = (_: any, payload: any) => callback(payload);
+        ipcRenderer.on('video-chunk', handler);
+        return () => ipcRenderer.removeListener('video-chunk', handler);
+    }
+}
 
 // Use `contextBridge` APIs to expose Electron APIs to
 // renderer only if context isolation is enabled, otherwise