refactor: Migrate screen sharing media handling from direct WebRTC to Mediasoup.

client/main.js

@@ -5,8 +5,10 @@ const PipewireHelper = require('./pipewire');
 // Ensure Chromium tries to use PipeWire for screen sharing on Linux
 app.commandLine.appendSwitch('enable-features', 'WebRTCPipeWireCapturer');
 
+let mainWindow = null;
+
 function createWindow() {
-  const win = new BrowserWindow({
+  mainWindow = new BrowserWindow({
     width: 1000,
     height: 800,
     icon: path.join(__dirname, 'icon.png'),
@@ -17,7 +19,11 @@ function createWindow() {
     }
   });
 
-  win.loadFile('index.html');
+  mainWindow.loadFile('index.html');
+
+  mainWindow.on('closed', () => {
+    mainWindow = null;
+  });
 }
 
 app.whenReady().then(async () => {
@@ -26,6 +32,18 @@ app.whenReady().then(async () => {
   
   createWindow();
 
+  // Monitor PipeWire graph for new/removed audio streams
+  PipewireHelper.startMonitoring(async () => {
+    try {
+      const apps = await PipewireHelper.getAudioApplications();
+      if (mainWindow && !mainWindow.isDestroyed()) {
+        mainWindow.webContents.send('audio-apps-updated', apps);
+      }
+    } catch (e) {
+      console.error('Failed to refresh audio apps:', e);
+    }
+  });
+
   app.on('activate', () => {
     if (BrowserWindow.getAllWindows().length === 0) {
       createWindow();
@@ -34,6 +52,7 @@ app.whenReady().then(async () => {
 });
 
 app.on('will-quit', async () => {
+   PipewireHelper.stopMonitoring();
    await PipewireHelper.destroyVirtualMic();
 });