fix: close tooltip before show desktop action

1. Added toolTip.close() before toggling show desktop
2. Prevents tooltip from remaining visible after clicking
3. Improves visual consistency when interacting with the dock

fix: 在显示桌面操作前关闭工具提示

1. 在切换显示桌面之前添加了toolTip.close()
2. 防止点击后工具提示仍然可见
3. 提高了与dock交互时的视觉一致性

Pms: BUG-324009

Author: wjyrich

panels/dock/showdesktop/package/showdesktop.qml

@@ -38,6 +38,7 @@ AppletItem {
         }
 
         onClicked: {
+            toolTip.close()
             Applet.toggleShowDesktop()
         }
         onHoveredChanged: {