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

lib/features/mailbox_dashboard/presentation/action/download_ui_action.dart

@@ -1,3 +1,6 @@
+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/core/id.dart';
 import 'package:model/email/attachment.dart';
 import 'package:tmail_ui_user/features/base/action/ui_action.dart';
@@ -12,13 +15,13 @@ class DownloadUIAction extends UIAction {
 }
 
 class UpdateAttachmentsViewStateAction extends DownloadUIAction {
-  UpdateAttachmentsViewStateAction(this.blobId, this.success);
+  UpdateAttachmentsViewStateAction(this.blobId, this.viewState);
 
   final Id? blobId;
-  final dynamic success;
+  final Either<Failure, Success> viewState;
 
   @override
-  List<Object?> get props => [blobId, success];
+  List<Object?> get props => [blobId, viewState];
 }
 
 class DownloadAttachmentsQuicklyAction extends DownloadUIAction {
@@ -29,3 +32,12 @@ class DownloadAttachmentsQuicklyAction extends DownloadUIAction {
   @override
   List<Object?> get props => [attachment];
 }
+
+class OpenMailtoLinkFromPreviewAttachmentAction extends DownloadUIAction {
+  OpenMailtoLinkFromPreviewAttachmentAction(this.uri);
+
+  final Uri? uri;
+
+  @override
+  List<Object?> get props => [uri];
+}