Module animation 

Keyframe animation system for time-varying filter parameters.

The animation system is built in layers:

1. Lerp — trait for component-wise linear interpolation (#351)
2. Easing — six easing functions: Hold, Linear, EaseIn, EaseOut, EaseInOut, Bezier (#352–#357)
3. Keyframe<T> — timestamp + value + per-segment easing (#349)
4. AnimationTrack<T> — sorted collection with value_at(t) (#350)
5. AnimatedValue<T> — Static(T) or Track(AnimationTrack<T>) (#358)
6. AnimationEntry — registered animation track for a specific filter parameter (#359)

Structs

AnimationEntry

A registered animation track for a specific filter parameter.

AnimationTrack

A sorted collection of keyframes with interpolated value_at(t) lookup.

Keyframe

A single keyframe in an animation track.

Enums

AnimatedValue

A value that is either constant or animated over time.

Easing

Easing function applied to a keyframe interval.

Traits

Lerp

A value that supports linear component-wise interpolation.