feat: Implement an Electron-based broadcasting client with screen/window and audio source selection, including Pipewire integration, and add auto-unmute to the viewer.

client/main.js

@@ -0,0 +1,83 @@
+const { app, BrowserWindow, desktopCapturer, ipcMain } = require('electron');
+const path = require('path');
+const PipewireHelper = require('./pipewire');
+
+// Ensure Chromium tries to use PipeWire for screen sharing on Linux
+app.commandLine.appendSwitch('enable-features', 'WebRTCPipeWireCapturer');
+
+function createWindow() {
+  const win = new BrowserWindow({
+    width: 1000,
+    height: 800,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.js'),
+      nodeIntegration: false,
+      contextIsolation: true,
+    }
+  });
+
+  win.loadFile('index.html');
+}
+
+app.whenReady().then(async () => {
+  // Setup the virtual microphone as soon as the app starts
+  await PipewireHelper.createVirtualMic();
+  
+  createWindow();
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createWindow();
+    }
+  });
+});
+
+app.on('will-quit', async () => {
+   await PipewireHelper.destroyVirtualMic();
+});
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit();
+  }
+});
+
+// Handle IPC request from renderer to get screen/audio sources
+ipcMain.handle('get-sources', async () => {
+  const inputSources = await desktopCapturer.getSources({
+    types: ['window', 'screen'],
+    fetchWindowIcons: true
+  });
+  
+  return inputSources.map(source => ({
+    id: source.id,
+    name: source.name,
+    thumbnail: source.thumbnail.toDataURL()
+  }));
+});
+
+// Handle Pipewire specific audio isolation requests
+ipcMain.handle('get-audio-apps', async () => {
+   return await PipewireHelper.getAudioApplications();
+});
+
+ipcMain.handle('link-app-audio', async (event, appName) => {
+   return await PipewireHelper.linkApplicationToMic(appName);
+});
+
+// Handle saving and loading the config.json profile
+const fs = require('fs');
+const configPath = path.join(__dirname, 'config.json');
+
+ipcMain.handle('get-config', () => {
+    try {
+        if (fs.existsSync(configPath)) {
+            return JSON.parse(fs.readFileSync(configPath, 'utf8'));
+        }
+    } catch (e) { console.error("Could not read config", e); }
+    return { serverUrl: 'http://localhost:3000', serverPassword: '' };
+});
+
+ipcMain.handle('save-config', (event, newConfig) => {
+    fs.writeFileSync(configPath, JSON.stringify(newConfig, null, 2), 'utf8');
+});