fix(launcher): adjust window layer and flags for proper display

Change window layer from Overlay to Top and add dynamic flags
based on debug mode to ensure proper window behavior.

调整窗口层级从Overlay到Top，并根据调试模式动态设置窗口标志，
确保窗口行为正确。

Log: 修复启动器窗口层级和标志设置
PMS: BUG-353181
Influence: 修复后启动器窗口将以正确的层级显示，避免窗口遮挡或显示异常问题。

Author: add-uos

shell-launcher-applet/package/launcheritem.qml

@@ -200,11 +200,16 @@ AppletItem {
         }
 
         DLayerShellWindow.anchors: DLayerShellWindow.AnchorBottom | DLayerShellWindow.AnchorTop | DLayerShellWindow.AnchorLeft | DLayerShellWindow.AnchorRight
-        DLayerShellWindow.layer: DLayerShellWindow.LayerOverlay
+        DLayerShellWindow.layer: DLayerShellWindow.LayerTop
         DLayerShellWindow.keyboardInteractivity: DLayerShellWindow.KeyboardInteractivityOnDemand
         DLayerShellWindow.exclusionZone: -1
         DLayerShellWindow.scope: "dde-shell/launchpad"
 
+        flags: {
+            if (DebugHelper.useRegularWindow) return Qt.Window
+            return (Qt.FramelessWindowHint | Qt.Tool)
+        }
+
         DWindow.enabled: !DebugHelper.useRegularWindow
         DWindow.windowRadius: 0
         DWindow.enableSystemResize: false