fix: completar migracion i18n de literales visibles

lib/pantallas/pantalla_ajustes.dart

@@ -11,6 +11,7 @@ import 'package:uuid/uuid.dart';
 
 import '../estado/estado_idioma.dart';
 import '../estado/estado_radio.dart';
+import '../l10n/app_localizations_ext.dart';
 import '../l10n/gen/app_localizations.dart';
 import '../modelos/emisora.dart';
 import '../modelos/grupo_favoritos.dart';
@@ -982,7 +983,7 @@ class _SeccionEmisoras extends StatelessWidget {
               const Spacer(),
               TextButton.icon(
                 icon: const Icon(Icons.add),
-                label: const Text('Añadir'),
+                label: Text(AppLocalizations.of(context).customStationsAdd),
                 onPressed: () => _mostrarFormularioAnadir(context),
               ),
             ],
@@ -1079,6 +1080,7 @@ class _FormularioEmisoraState extends State<_FormularioEmisora> {
 
   @override
   Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
     final bottom = MediaQuery.of(context).viewInsets.bottom;
     return Padding(
       padding: EdgeInsets.fromLTRB(
@@ -1094,7 +1096,7 @@ class _FormularioEmisoraState extends State<_FormularioEmisora> {
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
             Text(
-              'Añadir emisora',
+              l10n.addStationTitle,
               style: Theme.of(context).textTheme.titleLarge,
             ),
             const SizedBox(height: 16),
@@ -1121,19 +1123,19 @@ class _FormularioEmisoraState extends State<_FormularioEmisora> {
               keyboardType: TextInputType.url,
               validator: (v) {
                 if (v == null || v.trim().isEmpty) {
-                  return AppLocalizations.of(context).requiredField;
+                  return l10n.requiredField;
                 }
                 final uri = Uri.tryParse(v.trim());
-                if (uri == null || !uri.hasScheme) return 'URL no válida';
+                if (uri == null || !uri.hasScheme) return l10n.invalidUrl;
                 return null;
               },
             ),
             const SizedBox(height: 12),
             TextFormField(
               controller: _paisCtrl,
-              decoration: const InputDecoration(
-                labelText: 'País (opcional)',
-                border: OutlineInputBorder(),
+              decoration: InputDecoration(
+                labelText: l10n.countryOptionalLabel,
+                border: const OutlineInputBorder(),
               ),
             ),
             const SizedBox(height: 20),
@@ -1170,9 +1172,10 @@ class _SeccionBackup extends StatelessWidget {
 
       await Share.shareXFiles(
         [XFile(file.path)],
-        subject: 'PluriWave — copia de seguridad',
-        text:
-            'Configuración de PluriWave exportada el ${DateTime.now().toLocal()}',
+        subject: AppLocalizations.of(context).backupShareSubject,
+        text: AppLocalizations.of(
+          context,
+        ).backupShareText(DateTime.now().toLocal()),
       );
     } catch (e) {
       if (context.mounted) {
@@ -1204,9 +1207,9 @@ class _SeccionBackup extends StatelessWidget {
           context: context,
           builder:
               (ctx) => AlertDialog(
-                title: const Text('Importar configuración'),
-                content: const Text(
-                  'Esto añadirá los favoritos, emisoras y presets del fichero. ¿Continuar?',
+                title: Text(AppLocalizations.of(ctx).backupImportTitle),
+                content: Text(
+                  AppLocalizations.of(ctx).backupImportConfirmMessage,
                 ),
                 actions: [
                   TextButton(
@@ -1226,8 +1229,8 @@ class _SeccionBackup extends StatelessWidget {
           final messenger = ScaffoldMessenger.of(context);
           await estado.importarConfig(json);
           messenger.showSnackBar(
-            const SnackBar(
-              content: Text('Configuración importada correctamente'),
+            SnackBar(
+              content: Text(AppLocalizations.of(context).backupImportSuccess),
             ),
           );
         }
@@ -1264,14 +1267,14 @@ class _SeccionBackup extends StatelessWidget {
           ListTile(
             contentPadding: EdgeInsets.zero,
             leading: const Icon(Icons.upload_outlined),
-            title: const Text('Exportar configuración'),
+            title: Text(AppLocalizations.of(context).backupExportTitle),
             subtitle: Text(AppLocalizations.of(context).backupExportSubtitle),
             onTap: () => _exportar(context),
           ),
           ListTile(
             contentPadding: EdgeInsets.zero,
             leading: const Icon(Icons.download_outlined),
-            title: const Text('Importar configuración'),
+            title: Text(AppLocalizations.of(context).backupImportTitle),
             subtitle: Text(AppLocalizations.of(context).backupImportSubtitle),
             onTap: () => _importar(context),
           ),
@@ -1297,14 +1300,14 @@ class _SeccionInfo extends StatelessWidget {
                     final version =
                         snap.hasData
                             ? 'v${snap.data!.version}+${snap.data!.buildNumber}'
-                            : 'Cargando versión...';
+                            : AppLocalizations.of(ctx).appVersionLoading;
                     return ListTile(
                       contentPadding: EdgeInsets.zero,
                       leading: const PluriIcon(
                         glyph: PluriIconGlyph.settings,
                         variant: PluriIconVariant.filled,
                       ),
-                      title: const Text('PluriWave'),
+                      title: Text(AppLocalizations.of(ctx).appTitle),
                       subtitle: Text(
                         AppLocalizations.of(ctx).appVersionSubtitle(version),
                       ),
@@ -1321,7 +1324,7 @@ class _SeccionInfo extends StatelessWidget {
                           AppLocalizations.of(ctx).savedFavoritesTitle,
                         ),
                         trailing: Text(
-                          snap.data?.toString() ?? '—',
+                          snap.data?.toString() ?? AppLocalizations.of(ctx).dash,
                           style: Theme.of(ctx).textTheme.bodyLarge,
                         ),
                       ),
@@ -1329,8 +1332,8 @@ class _SeccionInfo extends StatelessWidget {
                 ListTile(
                   contentPadding: EdgeInsets.zero,
                   leading: const Icon(Icons.help_outline_rounded),
-                  title: Text(_helpTitle(ctx)),
-                  subtitle: Text(_helpSubtitle(ctx)),
+                  title: Text(AppLocalizations.of(ctx).helpTitle),
+                  subtitle: Text(AppLocalizations.of(ctx).helpSubtitle),
                   trailing: const Icon(Icons.chevron_right_rounded),
                   onTap: () => PluriOnboardingDialog.mostrar(ctx),
                 ),
@@ -1343,12 +1346,14 @@ class _SeccionInfo extends StatelessWidget {
                   ),
                   trailing: const Icon(Icons.check_circle, color: Colors.green),
                 ),
-                const ListTile(
+                ListTile(
                   contentPadding: EdgeInsets.zero,
-                  leading: Icon(Icons.music_note_outlined),
-                  title: Text('Audio en background'),
-                  subtitle: Text('Continúa al apagar la pantalla'),
-                  trailing: Icon(Icons.check_circle, color: Colors.green),
+                  leading: const Icon(Icons.music_note_outlined),
+                  title: Text(AppLocalizations.of(ctx).backgroundAudioTitle),
+                  subtitle: Text(
+                    AppLocalizations.of(ctx).backgroundAudioSubtitle,
+                  ),
+                  trailing: const Icon(Icons.check_circle, color: Colors.green),
                 ),
               ],
             ),
@@ -1357,28 +1362,6 @@ class _SeccionInfo extends StatelessWidget {
   }
 }
 
-String _helpTitle(BuildContext context) => switch (Localizations.localeOf(
-  context,
-).languageCode) {
-  'es' => 'Ayuda y tutorial',
-  'fr' => 'Aide et tutoriel',
-  'de' => 'Hilfe und Tutorial',
-  'it' => 'Aiuto e tutorial',
-  'pt' => 'Ajuda e tutorial',
-  _ => 'Help and tutorial',
-};
-
-String _helpSubtitle(BuildContext context) => switch (Localizations.localeOf(
-  context,
-).languageCode) {
-  'es' => 'Repasá funciones, consejos y novedades de PluriWave.',
-  'fr' => 'Revoyez les fonctions, conseils et nouveautés de PluriWave.',
-  'de' => 'Funktionen, Tipps und Neuigkeiten von PluriWave ansehen.',
-  'it' => 'Rivedi funzioni, consigli e novità di PluriWave.',
-  'pt' => 'Revê funções, dicas e novidades do PluriWave.',
-  _ => 'Review PluriWave features, tips and what’s new.',
-};
-
 String _formatearDuracionTimer(Duration duracion) {
   final horas = duracion.inHours;
   final minutos = duracion.inMinutes.remainder(60);