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/test-devices.js

@@ -0,0 +1,12 @@
+const { app, BrowserWindow } = require('electron');
+app.whenReady().then(() => {
+  const win = new BrowserWindow({ show: false });
+  win.webContents.executeJavaScript(`
+    navigator.mediaDevices.getUserMedia({audio:true}).then(() => 
+      navigator.mediaDevices.enumerateDevices()
+    ).then(devices => devices.map(d => d.label))
+  `).then(labels => {
+    console.log("LABELS:", labels.filter(l => l.toLowerCase().includes('screenshare')));
+    app.quit();
+  });
+});