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/pages/home.dart

@@ -108,7 +108,6 @@ class _HomePageState extends State<HomePage> {
     if (shouldLogout != true || !mounted) return;
 
     try {
-      context.read<TripBloc>().add(ResetTrips());
       context.read<UserBloc>().add(UserLoggedOut());
       _pageCache.clear();
       context.read<AuthBloc>().add(AuthSignOutRequested());