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/renderer-lyric/utils/ipc.ts

@@ -1,5 +1,6 @@
 import { rendererSend, rendererInvoke, rendererOn, rendererOff } from '@common/rendererIpc'
 import { CMMON_EVENT_NAME, WIN_LYRIC_RENDERER_EVENT_NAME } from '@common/ipcNames'
+import { isMac } from '@common/utils'
 
 type RemoveListener = () => void
 
@@ -18,6 +19,10 @@ export const onSettingChanged = (listener: LX.IpcRendererEventListenerParams<Par
 export const setWindowBounds = (bounds: LX.DesktopLyric.NewBounds) => {
   rendererSend<LX.DesktopLyric.NewBounds>(WIN_LYRIC_RENDERER_EVENT_NAME.set_win_bounds, bounds)
 }
+export const invalidateShadow = () => {
+  if (!isMac) return
+  rendererSend(WIN_LYRIC_RENDERER_EVENT_NAME.invalidate_shadow)
+}
 
 export const sendConnectMainWindowEvent = () => {
   rendererSend(WIN_LYRIC_RENDERER_EVENT_NAME.request_main_window_channel)