Build fluid, interruptible Apple animations

Use when designing, implementing, refactoring, reviewing, debugging, profiling, or testing animations and transitions in SwiftUI, UIKit, AppKit, or Core Animation across Apple platforms. Trigger for withAnimation, Animation, Transaction, Animatable, PhaseAnimator, KeyframeAnimator, matchedGeometryEffect, contentTransition, UIView.animate, UIViewPropertyAnimator, NSAnimationContext, view-controller transitions, CALayer or CAAnimation, springs, gesture-driven or interruptible motion, velocity continuity, system-transition coordination, CADisplayLink, UIUpdateLink, TimelineView, Reduce Motion, animation hitches, rendering or power cost, and animation regression tests. Do not…