springDescription property
Custom spring physics for the pill morph animation.
When null, uses the built-in iOS 26-style spring (stiffness 350, damping 30). Override to create slower, faster, or more/less bouncy transitions:
springDescription: const SpringDescription(
mass: 1, stiffness: 200, damping: 40, // slower, minimal overshoot
),
Implementation
final SpringDescription? springDescription;