CI fixes:
- artist_detail_screen.dart: drop unnecessary foundation import (debugPrint
comes from material) and unused metadata_prefetcher import.
Playback timing visibility (so we can stop guessing where the lag
lives):
- playTracks now logs serverUrl / token / configure / setQueue /
play() returned, each stage in milliseconds. The next time you
tap play, we'll see exactly where the seconds go.
- setQueueFromTracks adds two more measurements: total source-build
time across all tracks, and setAudioSources duration.
Small concrete win:
- audio_handler caches the application cache dir path on first use
(already cached in _maybeRegisterStreamCache; now also used in
_buildAudioSource for the LockCachingAudioSource path). One less
platform channel hit per track on cache-miss queue builds.
Once we see real numbers we can decide whether the fix is to build
sources lazily (initial source first → play → background-add the
rest), pre-warm the audio handler at app start so playTracks skips
serverUrl + token reads entirely, or something else.
bvandeusen
acc7149537