TF-4141 Add Action required folder to left menu

lib/features/thread/domain/exceptions/thread_exceptions.dart

@@ -1,2 +1,3 @@
+class NotFoundEmailsDeletedException implements Exception {}
 
-class NotFoundEmailsDeletedException implements Exception {}
+class InteractorIsNullException implements Exception {}

lib/features/thread/domain/repository/thread_repository.dart

@@ -93,4 +93,9 @@ abstract class ThreadRepository {
   );
 
   Future<void> clearEmailCacheAndStateCache(AccountId accountId, Session session);
+
+  Future<int> getCountUnreadEmailsInFolder({
+    required Session session,
+    required AccountId accountId,
+  });
 }

lib/features/thread/domain/state/get_count_emails_in_folder_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class GettingCountUnreadEmailsInFolder extends LoadingState {}
+
+class GetCountUnreadEmailsInFolderSuccess extends UIState {
+  final int count;
+
+  GetCountUnreadEmailsInFolderSuccess({required this.count});
+
+  @override
+  List<Object> get props => [count];
+}
+
+class GetCountUnreadEmailsInFolderFailure extends FeatureFailure {
+  GetCountUnreadEmailsInFolderFailure(dynamic exception)
+      : super(exception: exception);
+}

lib/features/thread/domain/usecases/get_count_unread_emails_in_folder_interactor.dart

@@ -0,0 +1,29 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/session/session.dart';
+import 'package:tmail_ui_user/features/thread/domain/repository/thread_repository.dart';
+import 'package:tmail_ui_user/features/thread/domain/state/get_count_emails_in_folder_state.dart';
+
+class GetCountUnreadEmailsInFolderInteractor {
+  final ThreadRepository _threadRepository;
+
+  GetCountUnreadEmailsInFolderInteractor(this._threadRepository);
+
+  Stream<Either<Failure, Success>> execute({
+    required Session session,
+    required AccountId accountId,
+  }) async* {
+    try {
+      yield Right(GettingCountUnreadEmailsInFolder());
+      final count = await _threadRepository.getCountUnreadEmailsInFolder(
+        session: session,
+        accountId: accountId,
+      );
+      yield Right(GetCountUnreadEmailsInFolderSuccess(count: count));
+    } catch (e) {
+      yield Left(GetCountUnreadEmailsInFolderFailure(e));
+    }
+  }
+}