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

lib/blocs/account/account_bloc.dart

@@ -21,6 +21,7 @@
 /// ```dart
 /// accountBloc.close();
 /// ```
+library;
 import 'dart:async';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:travel_mate/services/error_service.dart';

lib/blocs/account/account_state.dart

@@ -4,6 +4,7 @@
 /// instances. Subclasses should provide the relevant properties by
 /// overriding `props` so that the bloc can correctly determine whether
 /// the state has changed.
+library;
  
 /// Represents the initial state of the account feature.
 ///