TF-4233 Fix the response success check to use key presence instead of value nullness.

lib/features/labels/presentation/extensions/handle_label_action_type_extension.dart

@@ -48,7 +48,7 @@ extension HandleLabelActionTypeExtension on LabelController {
         labels: labels,
         selectedLabel: label,
         actionType: LabelActionType.edit,
-        onCreateNewLabelCallback: (newLabel) =>
+        onLabelActionCallback: (newLabel) =>
           editLabel(
             accountId: accountId,
             selectedLabel: label,

lib/features/labels/presentation/label_controller.dart

@@ -89,7 +89,7 @@ class LabelController extends BaseController with LabelContextMenuMixin {
     await DialogRouter().openDialogModal(
       child: CreateNewLabelModal(
         labels: labels,
-        onCreateNewLabelCallback: (label) => _createNewLabel(accountId, label),
+        onLabelActionCallback: (label) => _createNewLabel(accountId, label),
       ),
       dialogLabel: 'create-new-label-modal',
     );

lib/features/labels/presentation/mixin/label_context_menu_mixin.dart

@@ -12,6 +12,8 @@ import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 import 'package:tmail_ui_user/main/routes/route_navigation.dart';
 
 mixin LabelContextMenuMixin on PopupContextMenuActionMixin {
+  static const _labelActions = [LabelActionType.edit];
+
   Future<void> _openLabelPopupMenuAction(
     BuildContext context,
     ImagePaths imagePaths,
@@ -19,9 +21,7 @@ mixin LabelContextMenuMixin on PopupContextMenuActionMixin {
     RelativeRect position,
     OnLabelActionTypeCallback onLabelActionTypeCallback,
   ) async {
-    final listLabelAction = [LabelActionType.edit];
-
-    final popupMenuItems = listLabelAction
+    final popupMenuItems = _labelActions
         .map((actionType) => _buildLabelPopupMenuItem(
               label,
               actionType,
@@ -89,9 +89,7 @@ mixin LabelContextMenuMixin on PopupContextMenuActionMixin {
     Label label,
     OnLabelActionTypeCallback onLabelActionTypeCallback,
   ) async {
-    final listLabelAction = [LabelActionType.edit];
-
-    final contextMenuActions = listLabelAction
+    final contextMenuActions = _labelActions
         .map((actionType) => _buildLabelContextMenuItem(
           actionType,
           AppLocalizations.of(context),

lib/features/labels/presentation/models/label_action_type.dart

@@ -43,6 +43,15 @@ enum LabelActionType {
     }
   }
 
+  Key getModalPositiveActionKey() {
+    switch (this) {
+      case LabelActionType.create:
+        return const Key('create_label_button_action');
+      case LabelActionType.edit:
+        return const Key('save_label_button_action');
+    }
+  }
+
   String getContextMenuIcon(ImagePaths imagePaths) {
     switch (this) {
       case LabelActionType.create:

lib/features/labels/presentation/widgets/create_new_label_modal.dart

@@ -25,18 +25,18 @@ import 'package:tmail_ui_user/features/mailbox_creator/presentation/extensions/v
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
 import 'package:tmail_ui_user/main/routes/route_navigation.dart';
 
-typedef OnCreateNewLabelCallback = Function(Label label);
+typedef OnLabelActionCallback = Function(Label label);
 
 class CreateNewLabelModal extends StatefulWidget {
   final List<Label> labels;
   final LabelActionType actionType;
-  final OnCreateNewLabelCallback onCreateNewLabelCallback;
+  final OnLabelActionCallback onLabelActionCallback;
   final Label? selectedLabel;
 
   const CreateNewLabelModal({
     super.key,
     required this.labels,
-    required this.onCreateNewLabelCallback,
+    required this.onLabelActionCallback,
     this.actionType = LabelActionType.create,
     this.selectedLabel,
   });
@@ -182,6 +182,7 @@ class _CreateNewLabelModalState extends State<CreateNewLabelModal> {
                                 isPositiveActionEnabled: value,
                                 onPositiveAction: _onCreateNewLabel,
                                 onNegativeAction: _onCloseModal,
+                                positiveKey: widget.actionType.getModalPositiveActionKey(),
                               );
                             },
                           ),
@@ -338,7 +339,7 @@ class _CreateNewLabelModalState extends State<CreateNewLabelModal> {
           ? HexColor(_selectedColor!.toHexTriplet())
           : null,
     );
-    widget.onCreateNewLabelCallback(newLabel);
+    widget.onLabelActionCallback(newLabel);
 
     popBack();
   }