refactor: Centralize error and notification handling using a dedicated _errorService across various components.

lib/components/home/home_content.dart

@@ -11,6 +11,7 @@ import '../../blocs/trip/trip_bloc.dart';
 import '../../blocs/trip/trip_state.dart';
 import '../../blocs/trip/trip_event.dart';
 import '../../models/trip.dart';
+import '../../services/error_service.dart';
 
 /// Home content widget for the main application dashboard.
 ///
@@ -79,26 +80,16 @@ class _HomeContentState extends State<HomeContent>
         return BlocConsumer<TripBloc, TripState>(
           listener: (context, tripState) {
             if (tripState is TripOperationSuccess) {
-              ScaffoldMessenger.of(context).showSnackBar(
-                SnackBar(
-                  content: Text(tripState.message),
-                  backgroundColor: Colors.green,
-                ),
+              ErrorService().showSnackbar(
+                message: tripState.message,
+                isError: false,
               );
             } else if (tripState is TripError) {
-              ScaffoldMessenger.of(context).showSnackBar(
-                SnackBar(
-                  content: Text(tripState.message),
-                  backgroundColor: Colors.red,
-                ),
-              );
+              ErrorService().showError(message: tripState.message);
             } else if (tripState is TripCreated) {
-              ScaffoldMessenger.of(context).showSnackBar(
-                SnackBar(
-                  content: Text('Voyage en cours de création...'),
-                  backgroundColor: Colors.blue,
-                  duration: Duration(seconds: 1),
-                ),
+              ErrorService().showSnackbar(
+                message: 'Voyage en cours de création...',
+                isError: false,
               );
             }
           },