fix: correct code errors and fix dependencies

- Add missing dart:async import in horarios.dart
- Fix typo 'Anadir' -> 'Añadir' in domicilios.dart
- Simplify broken _obtenerHorarioConRetraso method
- Remove file whitespace in notification_service.dart
- Clean up unnecessary comments
- Add flutter_local_notifications to dependencies
- Move packages to correct section (dependencies not dev_dependencies)

pubspec.yaml

@@ -31,33 +31,25 @@ dependencies:
   flutter:
     sdk: flutter
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8
   supabase_flutter: ^2.5.0
   flutter_riverpod: ^2.6.1
   dio: ^5.3.1
   web_socket_channel: ^2.4.0
+  shared_preferences: ^2.2.2
+  geolocator: ^11.0.0
+  permission_handler: ^11.3.0
+  flutter_map: ^6.1.0
+  latlong2: ^0.9.0
+  google_maps_flutter: ^2.5.0
+  google_maps_flutter_web: ^0.5.0
+  url_launcher: ^6.2.0
+  flutter_local_notifications: ^16.1.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
-  shared_preferences: ^2.2.2
-  geolocator: ^11.0.0
-  permission_handler: ^11.3.0
-
-  flutter_map: ^6.1.0  # ← Agregar para el mapa
-  latlong2: ^0.9.0
-  google_maps_flutter: ^2.5.0
-  google_maps_flutter_web: ^0.5.0
-  url_launcher: ^6.2.0
-
-  # The "flutter_lints" package below contains a set of recommended lints to
-  # encourage good coding practices. The lint set provided by the package is
-  # activated in the `analysis_options.yaml` file located at the root of your
-  # package. See that file for information about deactivating specific lint
-  # rules and activating additional ones.
   flutter_lints: ^6.0.0
 
 # For information on the generic Dart part of this file, see the