Files
minstrel/flutter_client/lib
bvandeusen 2d5f0691c2 diag(flutter): surface player errors + state transitions
Tap→audio measured at ~370ms — that path's fast. Real symptom: a few
seconds of audio, then silence with no event surfaced to Flutter.
ExoPlayer is failing/completing somewhere and we have no log to act
on.

Three changes, all log-only:
- Add onError to playbackEventStream so stream failures (404, range-
  request bugs, decoder errors, network drops) print instead of
  silently halting playback.
- Subscribe to playerStateStream and log playing + processingState
  on every transition. Silent stops will now show as a state shift
  to completed / idle / buffering with no resumption.
- Subscribe to processingStateStream separately to catch fine-grained
  state transitions ExoPlayer reports between source advances.

After hot-restart, tap-then-go-quiet should produce a sequence we
can read — most likely either "processingState=completed" partway
through (server returning premature EOS or wrong Content-Length) or
a thrown error from ExoPlayer's source-loading path.
2026-05-11 19:43:37 -04:00
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