在歌词滚动结束后清理窗口阴影，缓解Mac下桌面歌词出现残留阴影的问题

src/main/modules/winLyric/main.ts

@@ -194,6 +194,11 @@ export const getMainFrame = (): Electron.WebFrameMain | null => {
   return browserWindow.webContents.mainFrame
 }
 
+export const invalidateShadow = () => {
+  if (!browserWindow) return
+  browserWindow.invalidateShadow()
+}
+
 interface AlwaysOnTopTools {
   timeout: NodeJS.Timeout | null
   setAlwaysOnTop: (isLoop: boolean) => void