fix: remove unused import in messaging_shell.dart (#966)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: SERDUN

lib/features/messaging/widgets/messaging_shell.dart

@@ -4,7 +4,6 @@ import 'package:auto_route/auto_route.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
 import 'package:webtrit_phone/app/router/app_router.dart';
-import 'package:webtrit_phone/blocs/app/app_bloc.dart';
 import 'package:webtrit_phone/data/data.dart';
 import 'package:webtrit_phone/features/features.dart';
 import 'package:webtrit_phone/repositories/repositories.dart';