TF-825 Download email as EML file (#2854)

lib/features/email/domain/state/download_attachment_for_web_state.dart

@@ -1,7 +1,6 @@
 import 'dart:typed_data';
 import 'package:core/presentation/state/failure.dart';
 import 'package:core/presentation/state/success.dart';
-import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:model/download/download_task_id.dart';
 import 'package:model/email/attachment.dart';
 
@@ -59,14 +58,14 @@ class DownloadAttachmentForWebSuccess extends UIState {
 class DownloadAttachmentForWebFailure extends FeatureFailure {
 
   final DownloadTaskId? taskId;
-  final Id? attachmentBlobId;
+  final Attachment? attachment;
 
   DownloadAttachmentForWebFailure({
-    required this.attachmentBlobId,
+    this.attachment,
     this.taskId,
     dynamic exception
   }) : super(exception: exception);
 
   @override
-  List<Object?> get props => [taskId, ...super.props];
+  List<Object?> get props => [attachment, taskId, ...super.props];
 }

lib/features/email/domain/state/view_attachment_for_web_state.dart

@@ -22,7 +22,7 @@ class ViewAttachmentForWebSuccess extends DownloadAttachmentForWebSuccess {
 
 class ViewAttachmentForWebFailure extends DownloadAttachmentForWebFailure {
   ViewAttachmentForWebFailure({
-    required super.attachmentBlobId,
+    required super.attachment,
     super.taskId,
     super.exception,
   });