feat: add modal property to notification setting menu

1. Set modal property to true for NotifySettingMenu
2. This prevents interaction with other UI elements while menu is open
3. Improves user experience by focusing attention on the menu
4. Ensures menu behavior is consistent with other modal dialogs

feat: 为通知设置菜单添加模态属性

1. 将 NotifySettingMenu 的 modal 属性设置为 true
2. 防止菜单打开时与其他 UI 元素交互
3. 通过将注意力集中在菜单上来改善用户体验
4. 确保菜单行为与其他模态对话框保持一致

PMS: BUG-299885

Author: wjyrich

panels/notification/center/NotifySettingMenu.qml

@@ -11,6 +11,7 @@ Menu {
     id: root
 
     closePolicy: Popup.CloseOnPressOutside | Popup.CloseOnEscape
+    modal: true
 
     function toggle()
     {