fix(player): restore stable audio switching

lib/estado/estado_radio.dart

@@ -304,7 +304,6 @@ class EstadoRadio extends ChangeNotifier {
 
   Future<void> reproducir(Emisora emisora) async {
     try {
-      notifyListeners();
       await audio.reproducir(emisora);
       unawaited(radio.registrarClick(emisora.uuid));
       await _aplicarPresetActivo(_presetParaEmisora(emisora.uuid));

lib/servicios/servicio_audio.dart

@@ -106,7 +106,6 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
 
   PresetEcualizador _presetActual = PresetEcualizador.flat;
   PresetEcualizador get presetActual => _presetActual;
-  int _playRequestId = 0;
 
   PluriWaveAudioHandler() {
     _setupStreams();
@@ -215,27 +214,15 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
 
   @override
   Future<void> playMediaItem(MediaItem mediaItem) async {
-    final requestId = ++_playRequestId;
     this.mediaItem.add(mediaItem);
-    emisoraActual = _emisoraDesdeMediaItem(mediaItem);
-    playbackState.add(playbackState.value.copyWith(
-      processingState: AudioProcessingState.loading,
-      playing: false,
-      errorMessage: null,
-    ));
     try {
       await _player.stop();
-      if (requestId != _playRequestId) return;
       await _player.setUrl(mediaItem.id);
-      if (requestId != _playRequestId) return;
       await _player.play();
-      if (requestId == _playRequestId) {
-        await _activarEcualizador();
-      }
+      emisoraActual = _emisoraDesdeMediaItem(mediaItem);
+      await _activarEcualizador();
     } on PlayerException catch (e) {
-      if (requestId == _playRequestId) {
-        _gestionarErrorReproduccion(e);
-      }
+      _gestionarErrorReproduccion(e);
       throw Exception(_mensajeAmigable(e));
     } on Exception catch (e) {
       developer.log(
@@ -243,15 +230,13 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
         name: 'ServicioAudio',
         level: 900,
       );
-      if (requestId == _playRequestId) {
-        playbackState.add(playbackState.value.copyWith(
-          processingState: AudioProcessingState.error,
-          playing: false,
-          errorMessage: 'Error inesperado al reproducir',
-        ));
-        emisoraActual = null;
-        this.mediaItem.add(null);
-      }
+      playbackState.add(playbackState.value.copyWith(
+        processingState: AudioProcessingState.error,
+        playing: false,
+        errorMessage: 'Error inesperado al reproducir',
+      ));
+      emisoraActual = null;
+      this.mediaItem.add(null);
       rethrow;
     }
   }