A replay could draw arrows but not depth, and the recording view said there was
nothing to draw even when a result existed. Depth is now quantised per frame
(14 B empty, 486 B at the worst frame seen), read from the cache by the same
draw path live uses, and the raw-recording note appears only when no result
exists. Format version 2; see apps/studio/docs/replay-analysis.md.
Replay re-ran the SDK chain on every seek; Part A's pass stores the flow
samples once. Opening a recording now reuses a compatible result or runs the
pass behind a progress/cancel surface, and one cursor with two modes
(recorded CSV, analysed) feeds the charts, the 2D canvas and the 3D pane by
frame id. A threshold, colour or idle-dot change redraws from the stored
frames and writes nothing; a cancelled pass is reported and never played.
Verified: apps/studio/tests 440 items / 0 failed / 18 skipped (15 new, no
existing assertion changed); shared 417 / 0 / 1; autocal 358.
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