- Memoize _resolveTuneFor per pane, invalidated by a revision bumped on every
tune mutation (all writes funnel through _aspectPersist). Panes with an
override no longer rebuild the merged object every frame; panes without one
still return the base directly.
- _aspectNowMs falls back to Date.now() when the Performance API is absent, so
pane/readout pruning still works in older/borrowed contexts.
- _setAspectPanelVisible prunes stale panes before the first dropdown build, so
panes from a prior song/split don't flash until the first RAF tick.
- Rename _abShortcutRegistered/_registerAspectAbShortcut to
_tunerShortcutRegistered/_registerTunerShortcut — the shortcut opens/closes
the tuner now, it isn't an A/B toggle.
- Fix a stale 'pane1' example in a comment (keys are 'arr:<name>'/'pane:<uid>').
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: topkoa <topkoa@gmail.com>
