spin static method
Spins one full turn every per forever — a continuous rotation.
Rotation runs linearly 0 → 1 turn (360°) per cycle of per (default
4 s) and loops forever unless repeat overrides — e.g.
Repeat.times(2) stops after two turns.
Implementation
static Animation spin({
Time per = const Time.seconds(4),
Time delay = Time.zero,
Trigger at = Trigger.auto,
Stagger? stagger,
Repeat? repeat,
String? label,
}) => buildSpin(per, _ambient(delay, at, stagger, repeat, label));