feat: add persist feature for frontend

frontend/src/main.ts

@@ -1,14 +1,17 @@
 import { createApp } from 'vue'
 import { createPinia } from 'pinia'
+import piniaPluginPersistedstate from 'pinia-plugin-persistedstate'
 
 import App from './App.vue'
 import router from './router'
 
 import '../public/index.scss'
 
-const app = createApp(App)
+const pinia = createPinia();
+pinia.use(piniaPluginPersistedstate);
 
-app.use(createPinia())
-app.use(router)
+const app = createApp(App);
+app.use(pinia);
+app.use(router);
 
-app.mount('#app')
+app.mount('#app');