motion-and-animation

Add motion and animation that feels great, not like slop. Use when animating any UI — transitions, hovers, presses, sheets, drawers, modals, page transitions, gestures — or when an animation feels "off". Covers the easing rules agents get wrong (ease-out for enter, ease-in for exit), springs, interruptibility, durations, component craft (never scale(0), origin-aware), and reduced motion. Grounded in Apple's…