✨ Fake call audio level

lib/widgets/chat/call_overlay.dart

@@ -247,8 +247,15 @@ class CallControlsBar extends HookConsumerWidget {
     String deviceType,
   ) async {
     try {
-      // TODO: Implement device switching for WebRTC
-      // This would require restarting the media stream with the new device
+      final callNotifier = ref.read(callNotifierProvider.notifier);
+      if (callNotifier.webrtcManager == null) return;
+
+      if (deviceType == 'videoinput') {
+        await callNotifier.webrtcManager!.switchCamera(device.deviceId);
+      } else if (deviceType == 'audioinput') {
+        await callNotifier.webrtcManager!.switchMicrophone(device.deviceId);
+      }
+
       if (context.mounted) {
         showSnackBar(
           'switchedTo'.tr(