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

lib/components/account/expense_detail_dialog.dart

@@ -5,6 +5,7 @@
 /// The dialog is highly interactive and adapts its UI based on the current user's permissions and the state
 /// of the expense. It also integrates with BLoC for state management and supports features like receipt display
 /// and split payment marking.
+library;
 
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';