feat: Add library directive to multiple BLoC and service files for improved organization

lib/components/account/account_content.dart

@@ -18,6 +18,7 @@
 ///
 /// The component automatically loads account data when initialized and
 /// provides a clean interface for managing group-based expenses.
+library;
 import 'package:flutter/material.dart';
 import 'package:travel_mate/blocs/user/user_bloc.dart';
 import '../../models/account.dart';