Implement keyboard navigation using arrow keys in the whole application. (#2)

Reviewed-on: #2

frontend/auth/main.js

@@ -3,9 +3,11 @@ import '@/assets/style.css'
 import { createApp } from 'vue'
 import { createPinia } from 'pinia'
 import App from './App.vue'
+import { initKeyboardNavigation } from '@/utils/keynav'
 
 const app = createApp(App)
 
 app.use(createPinia())
 
 app.mount('#app')
+initKeyboardNavigation()