client: implement queuing

src/main.js

@@ -6,5 +6,11 @@ import router from "./router";
 import "../src/assets/css/global.scss";
 
 import "animate.css";
+import mitt from "mitt";
 
-createApp(App).use(router).mount("#app");
+const emitter = mitt();
+
+const app = createApp(App);
+app.use(router);
+app.provide('emitter', emitter);
+app.mount('#app');