Michael Freno 22059c24ca fix(visualizer): show loading spinner on resume until fresh bars arrive ...

Resume re-arms a pipeline whose ffmpeg pass was killed at pause, so the
pre-pause bars are stale until fresh frames flow. Three changes:

- resumeVisualization always sets the loading state (previously only for
  positions outside decoded coverage) and records the resume point;
  renderFrame clears it only once the position clock advances past that
  point — a player still re-buffering after a long pause keeps the
  spinner instead of serving static cached bars.
- stopVisualization clears barData so cold restarts (unload, disable,
  episode change) show the spinner rather than stale bars, and never
  suppress it.
- renderFrame detects a frozen position clock while playing (STALL_DETECT_MS)
  and surfaces it as a loading state; recovery clears it.

Tests: resume-into-undecoded-audio shows loading until bars land; frozen
position clock surfaces a stall and recovery clears it; disable/enable
pins barData cleared on stop and the restart loading flash.

2026-08-13 21:04:12 -04:00

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