rimLight property

Strength of the iOS 27 rim highlight.

Two lobes at the ends of the light axis (lightAngle), the lit end stronger, each a sharp core one pixel inside the outline with a soft tail reaching a couple of points into the body. Additive, easing off as the body brightens so it reads the same over black and over white. 1.0 matches the native light material, 1.15 the dark; the wide specular controlled by lightIntensity is independent and can be left at zero alongside it.

Only affects the Premium (Impeller) path. Defaults to 0.0, off.