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

lib/blocs/trip/trip_bloc.dart

@@ -35,6 +35,7 @@
 /// // Delete a trip
 /// tripBloc.add(TripDeleteRequested(tripId: 'tripId456'));
 /// ```
+library;
 import 'dart:async';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:travel_mate/models/trip.dart';

lib/blocs/trip/trip_event.dart

@@ -14,6 +14,7 @@
 ///
 /// All events extend [TripEvent] and implement [Equatable] for proper
 /// equality comparison in the BLoC pattern.
+library;
 import 'package:equatable/equatable.dart';
 import '../../models/trip.dart';
 

lib/blocs/trip/trip_state.dart

@@ -15,6 +15,7 @@
 ///
 /// All states extend [TripState] and implement [Equatable] for proper
 /// equality comparison and state change detection in the BLoC pattern.
+library;
 import 'package:equatable/equatable.dart';
 import '../../models/trip.dart';