feat: Implement server data deletion functionality with confirmation dialog in SettingsScreen

lib/data/api_client.dart

@@ -217,6 +217,35 @@ class AuthApi {
     }
   }
 
+  Future<Map<String, dynamic>> deleteAllServerData({String? endpoint}) async {
+    final String? token = await accessToken;
+    if (token == null) {
+      return {'error': true, 'message': 'No access token available'};
+    }
+
+    final String base = endpoint ?? await ApiConfig.getEndpoint();
+    final Uri url = Uri.parse('$base/auth/delete-all-data');
+
+    final http.Response res = await http.post(
+      url,
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': 'Bearer $token',
+      },
+    );
+
+    if (res.statusCode >= 200 && res.statusCode < 300) {
+      return {'error': false, 'status': res.statusCode, 'body': res.body};
+    }
+
+    try {
+      final dynamic decoded = jsonDecode(res.body);
+      return {'error': true, 'status': res.statusCode, 'body': decoded};
+    } catch (_) {
+      return {'error': true, 'status': res.statusCode, 'body': res.body};
+    }
+  }
+
   List<int> _randomBytes(int length) {
     final Random random = Random.secure();
     return List<int>.generate(length, (_) => random.nextInt(256));

lib/screens/settings_screen.dart

@@ -26,6 +26,7 @@ class SettingsScreen extends StatefulWidget {
 class _SettingsScreenState extends State<SettingsScreen> {
   bool _isBusy = false;
   bool _isSyncing = false;
+  bool _isServerDeleting = false;
   bool _isThemeSaving = false;
   final TextEditingController _endpointController = TextEditingController();
   final TextEditingController _encryptionKeyController = TextEditingController();
@@ -83,6 +84,64 @@ class _SettingsScreenState extends State<SettingsScreen> {
     }
   }
 
+  Future<void> _confirmAndDeleteServerData() async {
+    final bool? confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Borrar toda la info del servidor'),
+        content: const Text(
+          '¿Estás seguro? Esta acción eliminará toda la información almacenada en el servidor y no se puede deshacer.',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(false),
+            child: const Text('Cancelar'),
+          ),
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(true),
+            child: const Text(
+              'Borrar',
+              style: TextStyle(color: Colors.red),
+            ),
+          ),
+        ],
+      ),
+    );
+
+    if (confirmed != true) return;
+
+    setState(() {
+      _isServerDeleting = true;
+    });
+
+    try {
+      final Map<String, dynamic> response =
+          await AuthApi.instance.deleteAllServerData();
+
+      if (response['error'] == true) {
+        throw Exception(response['body'] ?? response['message'] ?? 'Error desconocido');
+      }
+
+      await AuthApi.instance.clearTokens();
+
+      if (!mounted) return;
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Toda la información del servidor ha sido eliminada.')),
+      );
+    } catch (error) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Error al borrar la info del servidor: $error')),
+      );
+    } finally {
+      if (!mounted) return;
+      setState(() {
+        _isServerDeleting = false;
+      });
+    }
+  }
+
   Future<void> _forceSync() async {
     if (_isBusy || _isSyncing) {
       return;
@@ -219,6 +278,30 @@ class _SettingsScreenState extends State<SettingsScreen> {
     });
   }
 
+  Widget _buildDestructiveButton({
+    required String label,
+    required VoidCallback? onPressed,
+    required bool isLoading,
+    required IconData icon,
+  }) {
+    return ElevatedButton.icon(
+      style: ElevatedButton.styleFrom(
+        backgroundColor: Colors.redAccent,
+        foregroundColor: Colors.white,
+        textStyle: const TextStyle(fontWeight: FontWeight.w600),
+      ),
+      onPressed: onPressed,
+      icon: isLoading
+          ? const SizedBox(
+              width: 16,
+              height: 16,
+              child: CircularProgressIndicator(strokeWidth: 2),
+            )
+          : Icon(icon),
+      label: Text(label),
+    );
+  }
+
   Widget _buildThemeColorButton(Color color) {
     final bool isSelected = _selectedSeedColor.value == color.value;
     final Color foregroundColor =
@@ -382,21 +465,29 @@ class _SettingsScreenState extends State<SettingsScreen> {
                           const Expanded(
                             child: Text('Borrar datos locales:'),
                           ),
-                          ElevatedButton.icon(
+                          _buildDestructiveButton(
-                            style: ElevatedButton.styleFrom(
+                            label: 'Borrar',
-                              backgroundColor: Colors.redAccent,
+                            onPressed: (_isBusy || _isServerDeleting)
-                              foregroundColor: Colors.white,
+                                ? null
-                              textStyle: const TextStyle(fontWeight: FontWeight.w600),
+                                : _confirmAndDeleteAll,
+                            isLoading: _isBusy,
+                            icon: Icons.delete_forever,
                           ),
-                            onPressed: _isBusy ? null : _confirmAndDeleteAll,
+                        ],
-                            icon: _isBusy
+                      ),
-                                ? const SizedBox(
+                      const SizedBox(height: 16),
-                                    width: 16,
+                      Row(
-                                    height: 16,
+                        children: [
-                                    child: CircularProgressIndicator(strokeWidth: 2),
+                          const Expanded(
-                                  )
+                            child: Text('Borrar info del servidor:'),
-                                : const Icon(Icons.delete_forever),
+                          ),
-                            label: const Text('Borrar'),
+                          _buildDestructiveButton(
+                            label: 'Borrar',
+                            onPressed: (_isBusy || _isSyncing || _isServerDeleting)
+                                ? null
+                                : _confirmAndDeleteServerData,
+                            isLoading: _isServerDeleting,
+                            icon: Icons.cloud_off,
                           ),
                         ],
                       ),
@@ -407,7 +498,9 @@ class _SettingsScreenState extends State<SettingsScreen> {
                             child: Text('Forzar sincronizacion total:'),
                           ),
                           ElevatedButton.icon(
-                            onPressed: (_isBusy || _isSyncing) ? null : _forceSync,
+                            onPressed: (_isBusy || _isSyncing || _isServerDeleting)
+                                ? null
+                                : _forceSync,
                             icon: _isSyncing
                                 ? const SizedBox(
                                     width: 16,