fix(eq): stop the phone's FM sink from posing as the active output

Regression from the previous commit. Ranking every AudioDeviceInfo type this
build does not name individually ABOVE the built-in speaker was meant to let
a car stereo on LE Audio or an automotive bus win. It also promoted the
internal sinks a phone exposes permanently: on the Xiaomi test device
AudioManager reports TYPE_FM (14) as an output, so getActiveAudioDevice
picked it over the real speaker with nothing connected at all. Confirmed on
device:

  audio_devices.onListen -> {id=other:14:4, type=14, name=2412DPC0AG}

It then reached Dart under an `other:14:4` id whose type is neither the base
speaker nor a known one, slipped past the collision guard and had a preset
row persisted for it -- reinstating the exact symptom this series set out to
kill: a permanent green active-output dot on a device that was not connected.

Replace the deny-by-omission ranking with an explicit allow list of outputs a
user actually connects. The built-in speaker sits below all of them and above
everything else, so any sink that physically exists but is never where media
plays (TYPE_FM, TYPE_BUILTIN_SPEAKER_SAFE, telephony, remote submix) can no
longer be selected. A one-time purge clears the `other:` rows the bad build
persisted; genuine ones re-register on their next connection.

Fix the USB type constant while here: TYPE_USB_HEADSET is 22, not 14, and 14
is TYPE_FM. The Kotlin USB branch hardcoded 14 and the Dart type table
mirrored the same mistake, so the two cancelled out for real USB headsets
while making a phone's own FM sink decode as USB audio. Both now use 22.

Verified with javap against android.jar (android-36) rather than trusting the
comment that introduced the error.

android/app/src/main/kotlin/es/freetimelab/pluriwave/MainActivity.kt

@@ -1216,7 +1216,9 @@ class MainActivity : AudioServiceActivity() {
      *                                       or still the OS placeholder ("02:00:00:00:00:00", seen
      *                                       without BLUETOOTH_CONNECT); productName colons are
      *                                       sanitized to '-' to preserve the matrix-key delimiter
-     *   - "usb_headset:<address>"        — TYPE_USB_HEADSET (14)
+     *   - "usb_headset:<address>"        — TYPE_USB_HEADSET (22)
+     *   - "other:<type>:<address>"       — any other external output this build
+     *                                       does not name individually
      *   - "builtin_speaker"              — fallback when API < 23
      *
      * Type int values sent to Dart match the AudioDeviceInfo.TYPE_* constants.
@@ -1240,29 +1242,49 @@ class MainActivity : AudioServiceActivity() {
         return deviceToMap(best)
     }
 
+    /**
+     * Media outputs a user actively connects, in the order they should win when
+     * several are present. Index IS the priority.
+     *
+     * This is an ALLOW list on purpose. Ranking "everything not named here"
+     * above the built-in speaker looks equivalent and is not: a phone
+     * permanently exposes internal sinks that are legitimate outputs but never
+     * where music is playing -- TYPE_FM (14) on this project's Xiaomi test
+     * device, TYPE_BUILTIN_SPEAKER_SAFE (24) on many others. Those outranked
+     * the real speaker, got reported as the active device and had a preset row
+     * persisted for them.
+     */
+    private val externalOutputPriority = listOf(
+        AudioDeviceInfo.TYPE_BLUETOOTH_A2DP,
+        AudioDeviceInfo.TYPE_BLE_HEADSET,
+        AudioDeviceInfo.TYPE_BLE_SPEAKER,
+        AudioDeviceInfo.TYPE_BLE_BROADCAST,
+        AudioDeviceInfo.TYPE_HEARING_AID,
+        AudioDeviceInfo.TYPE_BUS,
+        AudioDeviceInfo.TYPE_USB_HEADSET,
+        AudioDeviceInfo.TYPE_USB_DEVICE,
+        AudioDeviceInfo.TYPE_USB_ACCESSORY,
+        AudioDeviceInfo.TYPE_WIRED_HEADSET,
+        AudioDeviceInfo.TYPE_WIRED_HEADPHONES,
+        AudioDeviceInfo.TYPE_LINE_ANALOG,
+        AudioDeviceInfo.TYPE_LINE_DIGITAL,
+        AudioDeviceInfo.TYPE_AUX_LINE,
+        AudioDeviceInfo.TYPE_DOCK,
+        AudioDeviceInfo.TYPE_HDMI,
+        AudioDeviceInfo.TYPE_HDMI_ARC,
+    )
+
     /**
      * Ranks an [AudioDeviceInfo] type as a media output candidate; lower wins.
      *
-     * Externally connected outputs outrank the built-in speaker, including types
+     * The built-in speaker is the fallback, so it sits below every external
-     * this build does not name individually. Virtual and call-only sinks
+     * output and above everything else — including outputs that physically
-     * (earpiece, telephony, remote submix) are pushed below the speaker so they
+     * exist but are never where media plays.
-     * can never be reported as where music is playing.
      */
-    private fun outputPriority(type: Int): Int = when (type) {
+    private fun outputPriority(type: Int): Int {
-        AudioDeviceInfo.TYPE_BLUETOOTH_A2DP -> 0
+        val index = externalOutputPriority.indexOf(type)
-        AudioDeviceInfo.TYPE_USB_HEADSET -> 1
+        if (index >= 0) return index
-        AudioDeviceInfo.TYPE_USB_DEVICE -> 2
+        return if (type == AudioDeviceInfo.TYPE_BUILTIN_SPEAKER) 90 else 99
-        AudioDeviceInfo.TYPE_WIRED_HEADSET -> 3
-        AudioDeviceInfo.TYPE_WIRED_HEADPHONES -> 4
-        AudioDeviceInfo.TYPE_BUILTIN_SPEAKER -> 90
-        AudioDeviceInfo.TYPE_BUILTIN_EARPIECE,
-        AudioDeviceInfo.TYPE_TELEPHONY,
-        AudioDeviceInfo.TYPE_REMOTE_SUBMIX,
-        AudioDeviceInfo.TYPE_BLUETOOTH_SCO -> 99
-        // Everything else is an output the user physically connected (LE Audio,
-        // hearing aids, car bus, dock, HDMI): above the speaker, below the
-        // types named above so a known match always wins a tie.
-        else -> 50
     }
 
     /**
@@ -1307,7 +1329,10 @@ class MainActivity : AudioServiceActivity() {
                 val addr = deviceAddress(device)?.takeIf { it.isNotBlank() } ?: device.id.toString()
                 mapOf(
                     "id" to "usb_headset:$addr",
-                    "type" to 14,
+                    // Send the real constant (22). The hardcoded 14 that used to
+                    // sit here is TYPE_FM, and Dart mirrored the mistake, so a
+                    // phone's own FM sink decoded as a USB headset.
+                    "type" to AudioDeviceInfo.TYPE_USB_HEADSET,
                     "name" to (device.productName?.toString() ?: "USB Headset"),
                 )
             }

lib/servicios/servicio_dispositivo_audio.dart

@@ -22,6 +22,13 @@ const prefijoPlaceholderBtName = 'bt_a2dp:name:';
 /// entry that then marked the wrong device as active forever.
 const idAltavozInterno = 'builtin_speaker';
 
+/// Id prefix for outputs the native layer does not name individually
+/// (`other:<AudioDeviceInfo type>:<address>`): LE Audio stereos, car buses,
+/// hearing aids, docks. Kept distinct from every other id namespace so such a
+/// device can never collide with [idAltavozInterno], and so a bad batch of them
+/// can be purged wholesale.
+const prefijoDispositivoOtro = 'other:';
+
 /// Abstract service for audio device detection.
 ///
 /// Implementations:
@@ -79,7 +86,11 @@ abstract class ServicioDispositivoAudio {
 ///   2  → altavozInterno (builtin_speaker)
 ///   3  → auricularesCable (wired_headset)
 ///   8  → bluetoothA2dp (`bt_a2dp:<MAC>`)
-///   14 → usbAudio (`usb_headset:<address>`)
+///   22 → usbAudio (`usb_headset:<address>`)
+///
+/// Values match `AudioDeviceInfo.TYPE_*`. Note 22, NOT 14: type 14 is
+/// `TYPE_FM`, an output plenty of phones expose permanently, and mapping it to
+/// USB audio made a phone's own FM sink look like a connected headset.
 class ServicioDispositivoAudioReal extends ServicioDispositivoAudio {
   static const _channelName = 'pluriwave/audio_devices';
 
@@ -189,7 +200,7 @@ class ServicioDispositivoAudioReal extends ServicioDispositivoAudio {
         return TipoDispositivo.auricularesCable;
       case 8:
         return TipoDispositivo.bluetoothA2dp;
-      case 14:
+      case 22:
         return TipoDispositivo.usbAudio;
       default:
         return TipoDispositivo.desconocido;

lib/servicios/servicio_ecualizador.dart

@@ -4,7 +4,8 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 import '../modelos/preset_ecualizador.dart';
 import 'persistencia_tolerante.dart';
-import 'servicio_dispositivo_audio.dart' show idAltavozInterno;
+import 'servicio_dispositivo_audio.dart'
+    show idAltavozInterno, prefijoDispositivoOtro;
 
 class ConfiguracionEcualizador {
   const ConfiguracionEcualizador({
@@ -106,9 +107,64 @@ class ServicioEcualizador {
     final prefs = await _resolverPrefs();
     if (prefs.getBool(_keyColisionBasePurgaHecha) ?? false) return;
     await _purgarDeviceId(prefs, idAltavozInterno);
+    await _purgarPrefijoDispositivo(prefs, prefijoDispositivoOtro);
     await prefs.setBool(_keyColisionBasePurgaHecha, true);
   }
 
+  /// Removes every device-keyed entry whose id starts with [prefijo].
+  ///
+  /// Used for the `other:` namespace: a build that ranked every unlisted
+  /// `AudioDeviceInfo` type above the phone speaker selected permanent internal
+  /// sinks (TYPE_FM on Xiaomi, TYPE_BUILTIN_SPEAKER_SAFE elsewhere) as the
+  /// active output and persisted rows for them. Genuine external outputs in
+  /// this namespace are re-registered on their next connection, so clearing the
+  /// whole prefix costs nothing and needs no per-type knowledge here.
+  Future<void> _purgarPrefijoDispositivo(
+    SharedPreferences prefs,
+    String prefijo,
+  ) async {
+    final presetsPorDispositivo = _leerMapa(prefs, _keyPresetsPorDispositivo);
+    final dispositivos = presetsPorDispositivo.keys
+        .where((clave) => clave.startsWith(prefijo))
+        .toList();
+
+    final nombres = _leerMapaStrings(prefs, _keyNombresDispositivos);
+    final nombresAPurgar = nombres.keys
+        .where((clave) => clave.startsWith(prefijo))
+        .toList();
+
+    final matriz = _leerMapa(prefs, _keyPresetsMatriz);
+    final matrizAPurgar = matriz.keys.where((clave) {
+      final separador = clave.indexOf(':');
+      if (separador == -1) return false;
+      return clave.substring(separador + 1).startsWith(prefijo);
+    }).toList();
+
+    for (final clave in dispositivos) {
+      presetsPorDispositivo.remove(clave);
+    }
+    for (final clave in nombresAPurgar) {
+      nombres.remove(clave);
+    }
+    for (final clave in matrizAPurgar) {
+      matriz.remove(clave);
+    }
+
+    if (dispositivos.isNotEmpty) {
+      await _guardarMapa(
+        prefs,
+        _keyPresetsPorDispositivo,
+        presetsPorDispositivo,
+      );
+    }
+    if (nombresAPurgar.isNotEmpty) {
+      await _guardarMapaStrings(prefs, _keyNombresDispositivos, nombres);
+    }
+    if (matrizAPurgar.isNotEmpty) {
+      await _guardarMapa(prefs, _keyPresetsMatriz, matriz);
+    }
+  }
+
   /// Removes every trace of [deviceId] from the three device-keyed SP maps.
   ///
   /// Shared by the guarded migrations and by [eliminarDispositivo]; each map is

test/servicios/servicio_dispositivo_audio_real_test.dart

@@ -81,10 +81,12 @@ void main() {
       expect(device.tipo, TipoDispositivo.bluetoothA2dp);
     });
 
-    test('obtenerDispositivoActual maps usb_headset (type=14)', () async {
+    // AudioDeviceInfo.TYPE_USB_HEADSET is 22, not 14. This mapping used to say
+    // 14, which is TYPE_FM — an output many phones expose permanently.
+    test('obtenerDispositivoActual maps usb_headset (type=22)', () async {
       stubGetActiveDevice({
         'id': 'usb_headset:0001:0002',
-        'type': 14,
+        'type': 22,
         'name': 'USB Headset',
       });
       final device = await servicio.obtenerDispositivoActual();
@@ -92,6 +94,17 @@ void main() {
       expect(device.tipo, TipoDispositivo.usbAudio);
     });
 
+    test('type 14 is FM, never USB audio', () async {
+      stubGetActiveDevice({
+        'id': 'other:14:4',
+        'type': 14,
+        'name': 'FM',
+      });
+      final device = await servicio.obtenerDispositivoActual();
+      expect(device.tipo, isNot(TipoDispositivo.usbAudio));
+      expect(device.tipo, TipoDispositivo.desconocido);
+    });
+
     test('obtenerDispositivoActual maps unknown type to desconocido', () async {
       stubGetActiveDevice({
         'id': 'unknown_device',

test/servicios/servicio_ecualizador_test.dart

@@ -648,6 +648,37 @@ void main() {
       );
     });
 
+    // A build that ranked every unlisted AudioDeviceInfo type above the phone
+    // speaker selected permanent internal sinks (TYPE_FM on Xiaomi) as the
+    // active output and persisted `other:` rows for them.
+    test('removes other: rows persisted for internal sinks', () async {
+      final prefs = await SharedPreferences.getInstance();
+      final servicio = ServicioEcualizador(prefs: prefs);
+      await servicio.guardarPresetDispositivo(
+        'other:14:4',
+        PresetEcualizador.jazz,
+      );
+      await servicio.guardarNombresDispositivos({'other:14:4': 'Omoda'});
+      await servicio.guardarPresetMatriz(
+        'station1:other:14:4',
+        PresetEcualizador.pop,
+      );
+      await servicio.guardarPresetDispositivo(
+        stableKey,
+        PresetEcualizador.rock,
+      );
+
+      final config = await servicio.cargar();
+
+      expect(config.presetsDispositivo.containsKey('other:14:4'), isFalse);
+      expect(config.nombresDispositivos.containsKey('other:14:4'), isFalse);
+      expect(config.presetsMatriz.containsKey('station1:other:14:4'), isFalse);
+      expect(
+        config.presetsDispositivo[stableKey],
+        equals(PresetEcualizador.rock),
+      );
+    });
+
     test('is guarded: a re-seeded base entry survives a second load', () async {
       final prefs = await SharedPreferences.getInstance();
       final servicio = ServicioEcualizador(prefs: prefs);