feat: Emby support (#234)

* fix: support credential extraction from Emby

* fix: minor compatibility with emby for retrieving albums

* fix: rename credentials and save credentials type

* fix: weird issue when changing libraries

* fix: correctly map platform names in auth header

* chore: properly carry over old settings

* fix: only enable playlists on jellyfin

* fix: remove jellyfin mentions

* fix: incorporate jellyfin and emby as mentions

src/screens/Music/stacks/components/TrackListView.tsx

@@ -114,7 +114,7 @@ const TrackListView: React.FC<TrackListViewProps> = ({
             return [['0', trackIds]];
         }
 
-        const groups = groupBy(trackIds, (id) => tracks[id].ParentIndexNumber);
+        const groups = groupBy(trackIds, (id) => tracks[id]?.ParentIndexNumber);
         return Object.entries(groups);
     }, [trackIds, tracks, listNumberingStyle]);