TF-4050 refactor: move attachment preview & download logic to download controller

lib/features/mailbox_dashboard/domain/repository/download_repository.dart

@@ -3,13 +3,17 @@ import 'dart:typed_data';
 
 import 'package:core/presentation/state/failure.dart';
 import 'package:core/presentation/state/success.dart';
+import 'package:core/presentation/utils/html_transformer/transform_configuration.dart';
 import 'package:dartz/dartz.dart';
 import 'package:dio/dio.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:model/account/account_request.dart';
 import 'package:model/download/download_task_id.dart';
 import 'package:model/email/attachment.dart';
+import 'package:tmail_ui_user/features/email/domain/model/preview_email_eml_request.dart';
+import 'package:tmail_ui_user/features/email/presentation/model/eml_previewer.dart';
 
 abstract class DownloadRepository {
   Future<Uint8List> downloadAttachmentForWeb(
@@ -32,4 +36,27 @@ abstract class DownloadRepository {
     StreamController<Either<Failure, Success>>? onReceiveController,
     CancelToken? cancelToken,
   });
+
+  Future<String> sanitizeHtmlContent(
+    String htmlContent,
+    TransformConfiguration configuration,
+  );
+
+  Future<List<Email>> parseEmailByBlobIds(AccountId accountId, Set<Id> blobIds);
+
+  Future<String> generatePreviewEmailEMLContent(
+    PreviewEmailEMLRequest previewEmailEMLRequest,
+  );
+
+  Future<void> sharePreviewEmailEMLContent(EMLPreviewer emlPreviewer);
+
+  Future<void> storePreviewEMLContentToSessionStorage(
+    EMLPreviewer emlPreviewer,
+  );
+
+  Future<EMLPreviewer> getPreviewEmailEMLContentShared(String keyStored);
+
+  Future<void> removePreviewEmailEMLContentShared(String keyStored);
+
+  Future<EMLPreviewer> getPreviewEMLContentInMemory(String keyStored);
 }