TF-1923 Fix new email offline mode not working

(cherry picked from commit c1c48e93d50cb0ebbccaf11c3f4a975af640b63a)

lib/features/email/domain/model/detailed_email.dart

@@ -1,12 +1,14 @@
 import 'package:equatable/equatable.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_header.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
 import 'package:model/email/attachment.dart';
 
 class DetailedEmail with EquatableMixin {
   final EmailId emailId;
   final List<Attachment>? attachments;
-  final List<EmailHeader>? headers;
+  final Set<EmailHeader>? headers;
+  final Map<KeyWordIdentifier, bool>? keywords;
   final String? htmlEmailContent;
   final String? emailContentPath;
 
@@ -14,6 +16,7 @@ class DetailedEmail with EquatableMixin {
     required this.emailId,
     this.attachments,
     this.headers,
+    this.keywords,
     this.htmlEmailContent,
     this.emailContentPath
   });
@@ -23,6 +26,7 @@ class DetailedEmail with EquatableMixin {
     emailId,
     attachments,
     headers,
+    keywords,
     htmlEmailContent,
     emailContentPath
   ];