fix(desktop): fix cannot flashframe problem

client/desktop/release/app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "tailchat-desktop",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "description": "A foundation for scalable desktop apps",
   "license": "MIT",
   "author": {

client/desktop/src/main/inject/message-handler.ts

@@ -22,7 +22,7 @@ export function handleTailchatMessage(
   }
 
   if (type === 'receiveUnmutedMessage') {
-    if (!win.isFocused) {
+    if (!win.isFocused()) {
       win.flashFrame(true);
     }
     return;