Bugs

syncJukeboxIfToken() is always called at startup, even if we have a jukebox already
"Caveat: If a sync gets past the fetch phase, runs clearAllTables(), then dies while writing some playlists, you could still end up with a partial cache. Fixing that would mean a single Room transaction or a “swap” strategy; say if you want that next."
"playlists 401" in Playlists Activity should send us back to the Spotify auth screen
the server should implement some rate limiting / deadman switch / to avoid spamming Spotify API with broken-app API calls

Nice-to

TrackFileMatching, scoreAgainstLocalHints
- these are very rudimentary heuristics to pairing mp3 files to the playlists. check them again.
Playlist has empty name, id=0gjOliftUAwV48X6KK9EeP
- in our server-side api, we might want to log such events too .
(pairing songs) "Possible race: openTree callback may capture an empty tracks list if the folder was picked before LiveData emitted."
toast: "no tracks loaded for this playlist yet. [...]"