feat: Implement account management features

- Added ExpenseDetailDialog for displaying expense details and actions.
- Created ExpensesTab to list expenses for a group.
- Developed GroupExpensesPage to manage group expenses with tabs for expenses, balances, and settlements.
- Introduced SettlementsTab to show optimized repayment plans.
- Refactored create_trip_content.dart to remove CountBloc and related logic.
- Added Account model to manage user accounts and group members.
- Replaced CountRepository with AccountRepository for account-related operations.
- Removed CountService and CountRepository as part of the refactor.
- Updated main.dart and home.dart to integrate new account management components.

lib/components/home/create_trip_content.dart

@@ -9,8 +9,6 @@ import '../../blocs/trip/trip_event.dart';
 import '../../blocs/trip/trip_state.dart';
 import '../../blocs/group/group_bloc.dart';
 import '../../blocs/group/group_event.dart';
-import '../../blocs/count/count_bloc.dart';
-import '../../blocs/count/count_event.dart';
 import '../../data/models/group.dart';
 import '../../data/models/group_member.dart';
 import '../../services/user_service.dart';
@@ -572,7 +570,7 @@ class _CreateTripContentState extends State<CreateTripContent> {
       final group = Group(
         id: '', // Sera généré par Firestore
         name: _titleController.text.trim(),
-        tripId: tripId,
+        tripId: tripId, // ✅ ID du voyage récupéré
         createdBy: currentUser.id,
       );
 
@@ -591,15 +589,11 @@ class _CreateTripContentState extends State<CreateTripContent> {
             )),
       ];
 
-      // Créer le groupe
       context.read<GroupBloc>().add(CreateGroupWithMembers(
             group: group,
             members: groupMembers,
           ));
 
-      // ✅ AJOUT : Attendre un court instant pour que le groupe soit créé
-      await Future.delayed(const Duration(milliseconds: 500));
-
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(