close method
void
close()
Closes the morph animation with the iOS 26 rubber-band bounce.
Injects LiquidMorphPhysics.closeVelocityHint to immediately drive the spring toward zero with momentum, creating the satisfying "snap-back" feel.
Implementation
void close() {
_isClosing = true;
_runSpring(0.0, velocityHint: LiquidMorphPhysics.closeVelocityHint);
}