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_fr.dart

@@ -1269,4 +1269,24 @@ class AppLocalizationsFr extends AppLocalizations {
   String advancedEqDevicePresetLabel(Object presetName) {
     return 'Preset : $presetName';
   }
+
+  @override
+  String preNoticeCountdown(int minutes) {
+    return 'Démarre dans $minutes min';
+  }
+
+  @override
+  String get eqDeviceEditTitle => 'Modifier l\'appareil';
+
+  @override
+  String get eqDeviceNameLabel => 'Nom de l\'appareil';
+
+  @override
+  String get eqDeviceNameHint => 'ex. : Enceinte salon';
+
+  @override
+  String get eqDeviceNameConfirm => 'Enregistrer';
+
+  @override
+  String get eqDeviceConnected => 'Connecté';
 }