feat(player): add radio recording and real waveform

lib/servicios/servicio_audio.dart

@@ -22,7 +22,10 @@ void registrarHandler(PluriWaveAudioHandler handler) {
 /// Wrapper de alto nivel para el UI.
 class ServicioAudio {
   PluriWaveAudioHandler get _handler {
-    assert(_handlerGlobal != null, 'registrarHandler() no fue llamado en main.dart');
+    assert(
+      _handlerGlobal != null,
+      'registrarHandler() no fue llamado en main.dart',
+    );
     return _handlerGlobal!;
   }
 
@@ -50,9 +53,10 @@ class ServicioAudio {
       title: emisora.nombre,
       artist: emisora.pais ?? '',
       album: 'PluriWave',
-      artUri: emisora.favicon != null && emisora.favicon!.isNotEmpty
-          ? Uri.tryParse(emisora.favicon!)
-          : null,
+      artUri:
+          emisora.favicon != null && emisora.favicon!.isNotEmpty
+              ? Uri.tryParse(emisora.favicon!)
+              : null,
       extras: {'uuid': emisora.uuid},
     );
     await _handler.playMediaItem(item);
@@ -73,6 +77,8 @@ class ServicioAudio {
   Future<void> setVolumen(double vol) => _handler.setVolumen(vol);
   double get volumen => _handler.volumen;
   bool get estaSonando => _handler.playbackState.value.playing;
+  Stream<int?> get androidAudioSessionIdStream =>
+      _handler.androidAudioSessionIdStream;
   Future<void> dispose() async {}
 
   // ── Ecualizador ───────────────────────────────────────────────────────────
@@ -83,8 +89,7 @@ class ServicioAudio {
   Future<void> aplicarPreset(PresetEcualizador preset) =>
       _handler.aplicarPreset(preset);
 
-  Future<void> setBanda(int index, double db) =>
-      _handler.setBanda(index, db);
+  Future<void> setBanda(int index, double db) => _handler.setBanda(index, db);
 }
 
 // ─────────────────────────────────────────────────────────────────────────────
@@ -99,6 +104,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
   StreamSubscription<PlayerState>? _estadoPlayerSub;
   StreamSubscription<Duration>? _bufferedSub;
   StreamSubscription<PlaybackEvent>? _eventosSub;
+  StreamSubscription<int?>? _androidAudioSessionIdSub;
+  final _androidAudioSessionIdController = StreamController<int?>.broadcast();
   Future<void> _colaCambioFuente = Future<void>.value();
   int _revisionFuente = 0;
 
@@ -112,6 +119,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
 
   PresetEcualizador _presetActual = PresetEcualizador.flat;
   PresetEcualizador get presetActual => _presetActual;
+  Stream<int?> get androidAudioSessionIdStream =>
+      _androidAudioSessionIdController.stream;
 
   PluriWaveAudioHandler() {
     _conectarStreamsPlayer();
@@ -127,18 +136,20 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
     _estadoPlayerSub = _player.playerStateStream.listen((state) {
       final playing = state.playing;
       final proc = state.processingState;
-      playbackState.add(playbackState.value.copyWith(
-        controls: [
-          if (playing) MediaControl.pause else MediaControl.play,
-          MediaControl.stop,
-        ],
-        systemActions: const {MediaAction.seek, MediaAction.stop},
-        androidCompactActionIndices: const [0],
-        processingState: _mapProcState(proc),
-        playing: playing,
-        bufferedPosition: _player.bufferedPosition,
-        speed: _player.speed,
-      ));
+      playbackState.add(
+        playbackState.value.copyWith(
+          controls: [
+            if (playing) MediaControl.pause else MediaControl.play,
+            MediaControl.stop,
+          ],
+          systemActions: const {MediaAction.seek, MediaAction.stop},
+          androidCompactActionIndices: const [0],
+          processingState: _mapProcState(proc),
+          playing: playing,
+          bufferedPosition: _player.bufferedPosition,
+          speed: _player.speed,
+        ),
+      );
     });
 
     _bufferedSub = _player.bufferedPositionStream.listen((pos) {
@@ -151,6 +162,14 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
         _gestionarErrorReproduccion(error);
       },
     );
+
+    _androidAudioSessionIdSub = _player.androidAudioSessionIdStream.listen((
+      sessionId,
+    ) {
+      if (!_androidAudioSessionIdController.isClosed) {
+        _androidAudioSessionIdController.add(sessionId);
+      }
+    });
   }
 
   /// Gestiona cualquier error de reproducción de ExoPlayer.
@@ -172,11 +191,13 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
       level: 900,
     );
 
-    playbackState.add(playbackState.value.copyWith(
-      processingState: AudioProcessingState.error,
-      playing: false,
-      errorMessage: mensaje,
-    ));
+    playbackState.add(
+      playbackState.value.copyWith(
+        processingState: AudioProcessingState.error,
+        playing: false,
+        errorMessage: mensaje,
+      ),
+    );
     emisoraActual = null;
     mediaItem.add(null);
 
@@ -236,11 +257,13 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
   Future<void> _cambiarFuente(MediaItem mediaItem, int revision) async {
     this.mediaItem.add(mediaItem);
     emisoraActual = _emisoraDesdeMediaItem(mediaItem);
-    playbackState.add(playbackState.value.copyWith(
-      processingState: AudioProcessingState.loading,
-      playing: false,
-      errorMessage: null,
-    ));
+    playbackState.add(
+      playbackState.value.copyWith(
+        processingState: AudioProcessingState.loading,
+        playing: false,
+        errorMessage: null,
+      ),
+    );
     try {
       await _recrearPlayer();
       if (revision != _revisionFuente) return;
@@ -263,11 +286,13 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
         stackTrace: stackTrace,
       );
       if (revision == _revisionFuente) {
-        playbackState.add(playbackState.value.copyWith(
-          processingState: AudioProcessingState.error,
-          playing: false,
-          errorMessage: 'Error inesperado al reproducir',
-        ));
+        playbackState.add(
+          playbackState.value.copyWith(
+            processingState: AudioProcessingState.error,
+            playing: false,
+            errorMessage: 'Error inesperado al reproducir',
+          ),
+        );
         emisoraActual = null;
         this.mediaItem.add(null);
       }
@@ -279,6 +304,7 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
     await _estadoPlayerSub?.cancel();
     await _bufferedSub?.cancel();
     await _eventosSub?.cancel();
+    await _androidAudioSessionIdSub?.cancel();
 
     final anterior = _player;
     try {
@@ -330,7 +356,11 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
     if (!_eqDisponible) return;
     try {
       final params = await _eq.parameters;
-      for (int i = 0; i < params.bands.length && i < preset.bandas.length; i++) {
+      for (
+        int i = 0;
+        i < params.bands.length && i < preset.bandas.length;
+        i++
+      ) {
         await params.bands[i].setGain(preset.bandas[i]);
       }
     } catch (_) {}
@@ -381,7 +411,9 @@ class PluriWaveAudioHandler extends BaseAudioHandler with SeekHandler {
     await _estadoPlayerSub?.cancel();
     await _bufferedSub?.cancel();
     await _eventosSub?.cancel();
+    await _androidAudioSessionIdSub?.cancel();
     await _player.dispose();
+    await _androidAudioSessionIdController.close();
   }
 
   Emisora _emisoraDesdeMediaItem(MediaItem mediaItem) {