fix: disable context menu on right-click

1. Prevent default context menu from appearing on right-click by
consuming the event in onPressed
2. Disable launcher toggle on touch screen long-press by introducing a
longPressed flag
3. Explicitly define acceptedButtons for left and right mouse buttons

Log: Disabled right-click and long-press context menus on launcher items

Influence:
1. Verify right-clicking a launcher item does not open a context menu
2. Verify long-pressing on a touchscreen does not trigger the launcher
toggle
3. Verify normal left-click still toggles the launcher correctly

fix: 禁用右键和长按菜单

1. 通过在 onPressed 中消费事件，阻止鼠标右键点击时弹出默认上下文菜单
2. 引入 longPressed 标志位，禁用触控屏长按触发启动器切换的功能
3. 显式定义左键和右键的 acceptedButtons

Log: 禁用启动器项上的右键和长按上下文菜单

Influence:
1. 验证鼠标右键点击启动器项不再弹出上下文菜单
2. 验证触控屏长按不再触发启动器切换
3. 验证普通鼠标左键点击仍能正常切换启动器

PMS: BUG-358827
Change-Id: I598c0c4a453ba63df5a3adf74df5260ba6bcf5a6

Author: fly602

shell-launcher-applet/package/launcheritem.qml

@@ -384,8 +384,19 @@ AppletItem {
     MouseArea {
         id: mouseHandler
         anchors.fill: parent
+        acceptedButtons: Qt.LeftButton | Qt.RightButton
+        property bool longPressed: false
+        onPressed: function (mouse) {
+            longPressed = false
+            if (mouse.button === Qt.RightButton) {
+                mouse.accepted = true
+            }
+        }
+        onPressAndHold: function (mouse) {
+            longPressed = true
+        }
         onClicked: function (mouse) {
-            if (mouse.button === Qt.LeftButton) {
+            if (mouse.button === Qt.LeftButton && !longPressed) {
                 toggleLauncher()
             }
         }