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_ar.dart

@@ -1247,4 +1247,24 @@ class AppLocalizationsAr extends AppLocalizations {
   String advancedEqDevicePresetLabel(Object presetName) {
     return 'الإعداد المسبق: $presetName';
   }
+
+  @override
+  String preNoticeCountdown(int minutes) {
+    return 'يبدأ خلال $minutes دقيقة';
+  }
+
+  @override
+  String get eqDeviceEditTitle => 'تعديل الجهاز';
+
+  @override
+  String get eqDeviceNameLabel => 'اسم الجهاز';
+
+  @override
+  String get eqDeviceNameHint => 'مثال: مكبر صوت غرفة المعيشة';
+
+  @override
+  String get eqDeviceNameConfirm => 'حفظ';
+
+  @override
+  String get eqDeviceConnected => 'متصل';
 }