feat: Implement account management functionality with loading, creation, and error handling

lib/blocs/account/account_event.dart

@@ -0,0 +1,63 @@
+import 'package:equatable/equatable.dart';
+import '../../data/models/account.dart';
+import '../../data/models/group_member.dart';
+
+abstract class AccountEvent extends Equatable {
+  const AccountEvent();
+
+  @override
+  List<Object?> get props => [];
+} 
+
+class LoadAccountsByUserId extends AccountEvent {
+  final String userId;
+
+  const LoadAccountsByUserId(this.userId);
+
+  @override
+  List<Object?> get props => [userId];
+}
+
+class LoadAccountsByTrip extends AccountEvent {
+  final String tripId;
+
+  const LoadAccountsByTrip(this.tripId);
+
+  @override
+  List<Object?> get props => [tripId];
+}
+
+class CreateAccount extends AccountEvent {
+  final Account account;
+
+  const CreateAccount(this.account);
+
+  @override
+  List<Object?> get props => [account];
+}
+
+class UpdateAccount extends AccountEvent {
+  final String accountId;
+  final Account account;
+
+  const UpdateAccount({
+    required this.accountId,
+    required this.account,
+  });
+
+  @override
+  List<Object?> get props => [accountId, account];
+}
+
+class CreateAccountWithMembers extends AccountEvent {
+  final Account account;
+  final List<GroupMember> members;
+
+  const CreateAccountWithMembers({
+    required this.account,
+    required this.members,
+  });
+
+  @override
+  List<Object?> get props => [account, members];
+}