feat(recording): add safety limits and adaptive headers

lib/pantallas/pantalla_ajustes.dart

@@ -87,10 +87,12 @@ class _SeccionGrabaciones extends StatelessWidget {
     if (ruta == null) return;
     try {
       await estado.cambiarDirectorioGrabacion(ruta);
+      if (!context.mounted) return;
       messenger.showSnackBar(
-        const SnackBar(content: Text('Ruta de grabación actualizada')),
+        SnackBar(content: Text(l10n.recordingsPathUpdated)),
       );
     } catch (e) {
+      if (!context.mounted) return;
       messenger.showSnackBar(
         SnackBar(content: Text(l10n.recordingsPathSaveError(e.toString()))),
       );
@@ -100,15 +102,97 @@ class _SeccionGrabaciones extends StatelessWidget {
   Future<void> _restaurarRuta(BuildContext context) async {
     final estado = context.read<EstadoRadio>();
     final messenger = ScaffoldMessenger.of(context);
+    final l10n = AppLocalizations.of(context);
     await estado.restaurarDirectorioGrabacion();
+    if (!context.mounted) return;
     messenger.showSnackBar(
-      const SnackBar(content: Text('Se usará la carpeta interna por defecto')),
+      SnackBar(content: Text(l10n.recordingsDefaultFolderRestored)),
     );
   }
 
+  Future<void> _abrirCarpeta(BuildContext context) async {
+    final estado = context.read<EstadoRadio>();
+    final messenger = ScaffoldMessenger.of(context);
+    final l10n = AppLocalizations.of(context);
+    try {
+      final abierto = await estado.abrirDirectorioGrabacion();
+      if (!context.mounted) return;
+      if (!abierto) {
+        messenger.showSnackBar(
+          SnackBar(content: Text(l10n.recordingsOpenFolderError(l10n.dash))),
+        );
+      }
+    } catch (e) {
+      if (!context.mounted) return;
+      messenger.showSnackBar(
+        SnackBar(content: Text(l10n.recordingsOpenFolderError(e.toString()))),
+      );
+    }
+  }
+
+  Future<void> _editarTamanoMaximo(BuildContext context) async {
+    final estado = context.read<EstadoRadio>();
+    final l10n = AppLocalizations.of(context);
+    final actualMb = _bytesAMegabytes(estado.maxBytesGrabacion);
+    final controller = TextEditingController(text: actualMb.toString());
+
+    final nuevoMb = await showModalBottomSheet<int>(
+      context: context,
+      isScrollControlled: true,
+      showDragHandle: true,
+      builder: (ctx) {
+        final bottom = MediaQuery.viewInsetsOf(ctx).bottom;
+        return Padding(
+          padding: EdgeInsets.fromLTRB(20, 0, 20, bottom + 24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                l10n.recordingsMaxSizeDialogTitle,
+                style: Theme.of(ctx).textTheme.titleLarge,
+              ),
+              const SizedBox(height: 16),
+              TextField(
+                controller: controller,
+                autofocus: true,
+                keyboardType: TextInputType.number,
+                decoration: InputDecoration(
+                  labelText: l10n.recordingsMaxSizeMbLabel,
+                  border: const OutlineInputBorder(),
+                ),
+              ),
+              const SizedBox(height: 16),
+              FilledButton.icon(
+                onPressed: () {
+                  final value = int.tryParse(controller.text.trim());
+                  if (value == null || value <= 0) return;
+                  Navigator.of(ctx).pop(value);
+                },
+                icon: const Icon(Icons.save_rounded),
+                label: Text(l10n.saveQuickAccessButton),
+              ),
+            ],
+          ),
+        );
+      },
+    );
+    controller.dispose();
+    if (nuevoMb == null || !context.mounted) return;
+    await estado.cambiarMaxBytesGrabacion(nuevoMb * 1024 * 1024);
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(l10n.recordingsMaxSizeSaved(nuevoMb))),
+    );
+  }
+
+  int _bytesAMegabytes(int bytes) =>
+      (bytes / (1024 * 1024)).round().clamp(1, 1048576);
+
   @override
   Widget build(BuildContext context) {
     final estado = context.watch<EstadoRadio>();
+    final l10n = AppLocalizations.of(context);
 
     return PluriGlassSurface(
       child: Column(
@@ -119,7 +203,7 @@ class _SeccionGrabaciones extends StatelessWidget {
               const Icon(Icons.radio_button_checked),
               const SizedBox(width: 12),
               Text(
-                AppLocalizations.of(context).recordingsSectionTitle,
+                l10n.recordingsSectionTitle,
                 style: Theme.of(context).textTheme.titleMedium,
               ),
             ],
@@ -130,35 +214,51 @@ class _SeccionGrabaciones extends StatelessWidget {
                 (ctx, snap) => ListTile(
                   contentPadding: EdgeInsets.zero,
                   leading: const Icon(Icons.folder_outlined),
-                  title: const Text('Carpeta de grabación'),
+                  title: Text(l10n.recordingsFolderTitle),
                   subtitle: Text(
-                    snap.data ?? AppLocalizations.of(context).recordingsPathCalculating,
+                    snap.data ?? l10n.recordingsPathCalculating,
                     maxLines: 2,
                     overflow: TextOverflow.ellipsis,
                   ),
                   onTap: () => _seleccionarRuta(context),
                 ),
           ),
-          Row(
+          Wrap(
+            spacing: 8,
+            runSpacing: 8,
             children: [
-              Expanded(
-                child: OutlinedButton.icon(
-                  icon: const Icon(Icons.folder_open_rounded),
-                  label: Text(AppLocalizations.of(context).recordingsChangePath),
-                  onPressed: () => _seleccionarRuta(context),
-                ),
+              OutlinedButton.icon(
+                icon: const Icon(Icons.folder_open_rounded),
+                label: Text(l10n.recordingsChangePath),
+                onPressed: () => _seleccionarRuta(context),
+              ),
+              FilledButton.tonalIcon(
+                icon: const Icon(Icons.folder_copy_rounded),
+                label: Text(l10n.recordingsOpenFolder),
+                onPressed: () => _abrirCarpeta(context),
               ),
-              const SizedBox(width: 8),
               IconButton.filledTonal(
-                tooltip: AppLocalizations.of(context).recordingsUseDefaultPath,
+                tooltip: l10n.recordingsUseDefaultPath,
                 icon: const Icon(Icons.restore_rounded),
                 onPressed: () => _restaurarRuta(context),
               ),
             ],
           ),
           const SizedBox(height: 8),
+          ListTile(
+            contentPadding: EdgeInsets.zero,
+            leading: const Icon(Icons.sd_storage_rounded),
+            title: Text(l10n.recordingsMaxSizeTitle),
+            subtitle: Text(
+              l10n.recordingsMaxSizeSubtitle(
+                _bytesAMegabytes(estado.maxBytesGrabacion),
+              ),
+            ),
+            onTap: () => _editarTamanoMaximo(context),
+          ),
+          const SizedBox(height: 8),
           Text(
-            AppLocalizations.of(context).recordingsOriginalStreamHint,
+            l10n.recordingsOriginalStreamHint,
             style: Theme.of(context).textTheme.bodySmall,
           ),
         ],