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Vance IngallsandClaude Sonnet 5
b155ed46b6
Whole-plan coherence review (Plan 3a Layout + Plan 3b Motion) found that Layout's keyframe gutter and Motion's Timing row independently derived an element's start/duration and disagreed whenever an element had animations but no explicit data-duration: Motion correctly inferred the range from the element's GSAP tweens, while Layout's keyframe gutter fell back to a naive `duration ?? 1`, so clicking a keyframe percentage in Layout could seek to a different absolute time than what Motion's Timing row displayed. Extract deriveElementTiming (propertyPanelFlatTimingDerivation.ts) as the single shared basis both paths now consume: FlatTimingRow (Motion) and PropertyPanelFlat's own elStart/elDuration (Layout's keyframe gutter and 3D Transform block). PropertyPanelFlat now recomputes this basis itself from its own element/gsapAnimations props instead of trusting the parent's naive value, so PropertyPanel.tsx (and its legacy non-flat panel) is untouched. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>