TF-3408 Auto load more when user uses arrow down of keyboard

lib/features/mailbox_dashboard/presentation/model/search/suggesstion_email_address.dart

@@ -1,17 +0,0 @@
-import 'package:equatable/equatable.dart';
-import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
-
-class SuggestionEmailAddress with EquatableMixin {
-  final EmailAddress emailAddress;
-  final SuggestionEmailState state;
-
-  SuggestionEmailAddress(this.emailAddress, {this.state = SuggestionEmailState.valid});
-
-  @override
-  List<Object?> get props => [emailAddress, state];
-}
-
-enum SuggestionEmailState {
-  valid,
-  duplicated,
-}