CurveProperty holds the easing curves in the order Animation.getCurve
takes them, replacing three copies of the list in zoom, freelook and the
animation config; it's saved the same way. Its dropdown opens a
CurveOptions popup: a CurvePreview graph beside the list, with a dot
running along the hovered curve, or the current one.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
