fix(alarm): add due alarm watchdog

lib/app.dart

@@ -50,6 +50,7 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
   int _indice = 0;
   StreamSubscription<String>? _errorSubscription;
   StreamSubscription<EventoAlarmaAndroid>? _alarmaSubscription;
+  StreamSubscription<AlarmaMusical>? _alarmaVencidaSubscription;
   EstadoRadio? _estadoSuscrito;
   bool _alarmaInicialProcesada = false;
 
@@ -129,6 +130,12 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
       if (!mounted) return;
       _abrirAlarmaSonando(evento);
     });
+    _alarmaVencidaSubscription ??= alarmas.alarmasVencidasStream.listen((
+      alarma,
+    ) {
+      if (!mounted) return;
+      _abrirAlarmaDirecta(alarma);
+    });
     if (!_alarmaInicialProcesada) {
       _alarmaInicialProcesada = true;
       unawaited(_procesarAlarmaInicial(alarmas));
@@ -139,6 +146,7 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
   void dispose() {
     _errorSubscription?.cancel();
     _alarmaSubscription?.cancel();
+    _alarmaVencidaSubscription?.cancel();
     super.dispose();
   }
 
@@ -223,6 +231,15 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
     );
   }
 
+  Future<void> _abrirAlarmaDirecta(AlarmaMusical alarma) async {
+    await Navigator.of(context).push(
+      MaterialPageRoute<void>(
+        builder: (_) => PantallaAlarmaSonando(alarma: alarma),
+        fullscreenDialog: true,
+      ),
+    );
+  }
+
   void _mostrarTimerDialog(BuildContext context) {
     final estado = context.read<EstadoRadio>();
     showModalBottomSheet(