Nuxt Auth expects a normal API to poll the user data on refresh, like "/user/me". Due to Jellyfin
needing the user's ID to fetch their information, this commit registers a new Auth plugin and a
persistent Vuex store, saved to localStorage, to perform the request manually when Nuxt starts up.
It then sets all the required information before the client properly starts, meaning the information
is always fresh when the user refreshes the page.
a snackbar plugin can be called from anywhere (vue instances, vue stores and contexts) with the
$snackbar(msg:string, color:string|undefined|null) signature
implements #18
