feat: add taskbar flashing on new notifications (#1209)

Co-authored-by: V <vendicated@riseup.net>

src/main/ipc.ts

@@ -142,6 +142,11 @@ handle(IpcEvents.SELECT_VENCORD_DIR, async (_e, value?: null) => {
 
 handle(IpcEvents.SET_BADGE_COUNT, (_, count: number) => setBadgeCount(count));
 
+handle(IpcEvents.FLASH_FRAME, (_, flag: boolean) => {
+    if (!mainWin || mainWin.isDestroyed() || (flag && mainWin.isFocused())) return;
+    mainWin.flashFrame(flag);
+});
+
 handle(IpcEvents.CLIPBOARD_COPY_IMAGE, async (_, buf: ArrayBuffer, src: string) => {
     clipboard.write({
         html: `<img src="${src.replaceAll('"', '\\"')}">`,