fix: remove redundant focus property in notification center

Removed explicit focus: true from OverlapNotify component as it was
causing focus issues when multiple notifications are present. Added
focus management to the main view container to clear focus when
NotificationCenter is closed. Replaced Control with FocusScope in
NotifyItemContent to better handle focus behavior and simplified the
close button visibility logic.

Log: Fixed focus issues in notification center

Influence:
1. Test notification center opening and closing behavior
2. Verify focus transitions between notifications
3. Check close button visibility and functionality
4. Test keyboard navigation through notifications
5. Verify focus is properly cleared when center is closed

fix: 修复通知中心的焦点问题

移除了OverlapNotify组件中显式的focus: true属性，该属性在多个通知同时存在
时会导致焦点问题。为主视图容器添加了焦点管理，在通知中心关闭时清除焦点。
将NotifyItemContent中的Control替换为FocusScope以更好地处理焦点行为，并简
化了关闭按钮的可见性逻辑。

Log: 修复通知中心的焦点问题

Influence:
1. 测试通知中心打开和关闭行为
2. 验证通知之间的焦点转换
3. 检查关闭按钮的可见性和功能
4. 测试通过键盘在通知间的导航
5. 验证通知中心关闭时焦点是否正确清除

PMS: BUG-284139

Author: 18202781743

panels/notification/center/NotifyViewDelegate.qml

@@ -120,7 +120,6 @@ DelegateChooser {
         OverlapNotify {
             id: overlapNotify
             objectName: "overlap-" + model.appName
-            focus: true
             width: 360
             activeFocusOnTab: true
 

panels/notification/center/package/main.qml

@@ -81,6 +81,8 @@ Window {
     Item {
         id: view
         width: parent.width
+        // clear focus when NotificationCenter is closed.
+        focus: root.visible
         anchors {
             top: parent.top
             left: parent.left

panels/notification/plugin/NotifyItemContent.qml

@@ -42,8 +42,7 @@ NotifyItem {
     }
 
     // placeHolder to receive MouseEvent
-    Control {
-        id: closePlaceHolder
+    FocusScope {
         focus: true
         anchors {
             top: parent.top
@@ -53,14 +52,15 @@ NotifyItem {
         }
         width: 20
         height: 20
-        contentItem: Loader {
-            active: !(root.strongInteractive && root.actions.length > 0) && (root.closeVisible || closePlaceHolder.hovered || closePlaceHolder.activeFocus || activeFocus)
+
+        Loader {
+            active: !(root.strongInteractive && root.actions.length > 0) && (root.closeVisible || activeFocus)
             sourceComponent: SettingActionButton {
                 id: closeBtn
                 objectName: "closeNotify-" + root.appName
                 icon.name: "clean-alone"
                 padding: 2
-                forcusBorderVisible: visualFocus || closePlaceHolder.visualFocus
+                forcusBorderVisible: visualFocus
                 onClicked: function () {
                     root.remove()
                 }