[bugfix]: Handle top-level songs for Jellyfin (#553)

* [bugfix]: Handle top-level songs for Jellyfin

If a song is at the top level of a music folder, Jellyfin will not
group that into an album (See https://jellyfin.org/docs/general/server/media/music/).

This PR introduces a few changes:
- Gives tracks with no album ID a special route (`/dummy/${id}`)
- Gives a new route for dummy albums, warning about the error. This is designed to look _like_ the album detail page

* `are are` > `are`

* revert name changes

src/renderer/router/routes.ts

@@ -1,6 +1,7 @@
 export enum AppRoute {
     ACTION_REQUIRED = '/action-required',
     EXPLORE = '/explore',
+    FAKE_LIBRARY_ALBUM_DETAILS = '/library/albums/dummy/:albumId',
     HOME = '/',
     LIBRARY_ALBUMS = '/library/albums',
     LIBRARY_ALBUMS_DETAIL = '/library/albums/:albumId',