feat: Enhance trip management features and improve UI responsiveness

- Implemented AutomaticKeepAliveClientMixin in HomeContent to maintain state during navigation.
- Modified trip loading logic to trigger after the first frame for better performance.
- Updated trip loading events to use LoadTripsByUserId for consistency.
- Added temporary success messages for trip creation and operations.
- Improved UI elements for better user experience, including updated text styles and spacing.
- Refactored trip model to support Firestore timestamps and improved error handling during parsing.
- Streamlined trip repository methods for better clarity and performance.
- Enhanced trip service methods to ensure correct mapping from Firestore documents.
- Removed unnecessary trip reset logic on logout.

lib/services/trip_service.dart

@@ -17,7 +17,7 @@ class TripService {
 
       return querySnapshot.docs.map((doc) {
         final data = doc.data() as Map<String, dynamic>;
-        return Trip.fromMap({...data, 'id': doc.id});
+        return Trip.fromMap({...data, 'id': doc.id}, doc.id);
       }).toList();
     } catch (e) {
       _errorService.logError('Erreur lors du chargement des voyages: $e', StackTrace.current);
@@ -176,7 +176,7 @@ class TripService {
       processedData['description'] = processedData['description'] ?? '';
       processedData['status'] = processedData['status'] ?? 'draft';
       
-      final trip = Trip.fromMap(processedData);
+      final trip = Trip.fromMap(processedData, docId);
       return trip;
       
     } catch (e, stackTrace) {
@@ -224,7 +224,7 @@ class TripService {
 
       if (doc.exists) {
         final data = doc.data() as Map<String, dynamic>;
-        return Trip.fromMap({...data, 'id': doc.id});
+        return Trip.fromMap({...data, 'id': doc.id}, doc.id);
       }
       return null;
     } catch (e) {