[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/api/jellyfin/jellyfin-normalize.ts

@@ -134,7 +134,7 @@ const normalizeSong = (
             imageUrl: null,
             name: entry.Name,
         })),
-        albumId: item.AlbumId,
+        albumId: item.AlbumId || `dummy/${item.Id}`,
         artistName: item?.ArtistItems?.[0]?.Name,
         artists: item?.ArtistItems?.map((entry) => ({
             id: entry.Id,