[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-api.ts

@@ -185,6 +185,15 @@ export const contract = c.router({
             400: jfType._response.error,
         },
     },
+    getSongData: {
+        method: 'GET',
+        path: 'users/:userId/items/:id',
+        query: jfType._parameters.songDetail,
+        responses: {
+            200: jfType._response.song,
+            400: jfType._response.error,
+        },
+    },
     getSongDetail: {
         method: 'GET',
         path: 'users/:userId/items/:id',