TF-1677: Support validation email for something@localhost case

(cherry picked from commit e74208941e8e5a2480bb444eca6b462bc576eb94)

lib/features/contact/presentation/widgets/autocomplete_contact_text_field_with_tags.dart

@@ -18,6 +18,7 @@ import 'package:tmail_ui_user/features/contact/presentation/widgets/contact_inpu
 import 'package:tmail_ui_user/features/contact/presentation/widgets/contact_suggestion_box_item.dart';
 import 'package:tmail_ui_user/features/manage_account/presentation/menu/settings_utils.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
+import 'package:tmail_ui_user/main/utils/app_utils.dart';
 
 typedef OnSuggestionContactCallbackAction = Future<List<EmailAddress>> Function(String query);
 typedef OnAddListContactCallbackAction = Function(List<EmailAddress> listEmailAddress);
@@ -256,7 +257,7 @@ class _AutocompleteContactTextFieldWithTagsState extends State<AutocompleteConta
   }
 
   bool _isValidAllEmailAddress(List<EmailAddress> addedEmailAddress) {
-    return addedEmailAddress.every((addedMail) => addedMail.emailAddress.isEmail);
+    return addedEmailAddress.every((addedMail) => addedMail.emailAddress.isEmail || AppUtils.isEmailLocalhost(addedMail.emailAddress));
   }
 
   bool _inputFieldIsEmpty() {

lib/features/contact/presentation/widgets/contact_input_tag_item.dart

@@ -9,6 +9,7 @@ import 'package:get/get.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:model/extensions/email_address_extension.dart';
 import 'package:tmail_ui_user/features/contact/presentation/widgets/gradient_color_avatar_icon.dart';
+import 'package:tmail_ui_user/main/utils/app_utils.dart';
 
 typedef DeleteContactCallbackAction = Function(EmailAddress contactDeleted);
 
@@ -84,7 +85,7 @@ class ContactInputTagItem extends StatelessWidget {
     }
   }
 
-  bool _isValidEmailAddress(String value) => value.isEmail;
+  bool _isValidEmailAddress(String value) => value.isEmail || AppUtils.isEmailLocalhost(value);
 
   Color _getTagBackgroundColor() {
     if (lastTagFocused && isLastContact) {

lib/main/utils/app_utils.dart

@@ -32,4 +32,8 @@ class AppUtils {
   static bool isDirectionRTL(BuildContext context) {
     return intl.Bidi.isRtlLanguage(Localizations.localeOf(context).languageCode);
   }
+
+  static bool isEmailLocalhost(String email) {
+    return  RegExp(r'^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@localhost$').hasMatch(email);
+  }
 }