innerBlur property
Sigma of the backdrop blur painted behind the RESTING selected pill
(Apple-style "frost at rest"). Scaled internally by the resting opacity so
it is full when settled and fades out as the pill morphs into the
liquid-glass lens during a drag/tap — keeping motion crisp. 0.0 (default)
disables it. Only renders on the background-painting indicator
(paintBackground == true); reads through a translucent indicatorColor.
Implementation
final double innerBlur;