The prior code used `form.addToPlaylist`, not `.success`. Also fixes English pluralization and
uses the correct `entity.track` as opposed to `entity.song` for other languages (I am not sure
if the en syntax could be applied to other languages, so I will just leave pluralization as-is
for now).
* Add api for add/remove playlist items
* Add playlistItemId property to normalized Song
- This is used for Navidrome to delete songs from playlists
* Add mutations for add/remove from playlist
* Add context modal for playlist add
* Add remove from playlist from context menu
* Set jellyfin to use playlistItemId
* Adjust font sizing
* Add playlist add from detail pages
* Bump mantine to v6-alpha.2
