Connects the previously-inert track context-menu items now that the
backends exist:
- Add to library -> add_favorite("track").
- Go to album / Go to artist -> resolve the track (get_track) to its
album / performer and navigate there.
- Create radio -> Qobuz track radio (new get_radio_track core wrapper
over the existing qbz-qobuz endpoint + playback::play_track_radio).
- Share Qobuz link -> https://www.qobuz.com/track/{id} to clipboard
(new arboard dep + share module).
- Share Song.link -> Odesli (api.song.link) pageUrl resolution to
clipboard.
- Add to playlist -> a global picker modal (PlaylistPickerModal +
PlaylistPickerState/Actions + playlist_picker controller) listing
the user's playlists; picking one calls add_tracks_to_playlist.
Add to mixtape / Make available offline / Track info stay unwired
(no backend yet).
cc
