fix(eq): seed device ID at startup and add device management UI

Fix multi-device EQ auto-switching by calling obtenerDispositivoActual()
during cargarPersistido() to seed the initial device ID. Add device
management modal with rename support, EQ preset editing, and connection
status indicator. Translate device UI keys to all 13 locales.

lib/l10n/gen/app_localizations.dart

@@ -2305,6 +2305,42 @@ abstract class AppLocalizations {
   /// In es, this message translates to:
   /// **'Preset: {presetName}'**
   String advancedEqDevicePresetLabel(Object presetName);
+
+  /// No description provided for @preNoticeCountdown.
+  ///
+  /// In es, this message translates to:
+  /// **'Empieza en {minutes} min'**
+  String preNoticeCountdown(int minutes);
+
+  /// No description provided for @eqDeviceEditTitle.
+  ///
+  /// In es, this message translates to:
+  /// **'Editar dispositivo'**
+  String get eqDeviceEditTitle;
+
+  /// No description provided for @eqDeviceNameLabel.
+  ///
+  /// In es, this message translates to:
+  /// **'Nombre del dispositivo'**
+  String get eqDeviceNameLabel;
+
+  /// No description provided for @eqDeviceNameHint.
+  ///
+  /// In es, this message translates to:
+  /// **'Ej: Altavoz del living'**
+  String get eqDeviceNameHint;
+
+  /// No description provided for @eqDeviceNameConfirm.
+  ///
+  /// In es, this message translates to:
+  /// **'Guardar'**
+  String get eqDeviceNameConfirm;
+
+  /// No description provided for @eqDeviceConnected.
+  ///
+  /// In es, this message translates to:
+  /// **'Conectado'**
+  String get eqDeviceConnected;
 }
 
 class _AppLocalizationsDelegate