New features:
- Easing functions: linear, ease-in/out, cubic, expo, bounce, elastic, back
- Animation struct for tweening values over time
- AnimationGroup for parallel/sequential animations
- Timer for frame-based updates (one-shot and repeating)
- Helper functions: lerp, inverseLerp, mapRange
Animation features:
- Configurable repeat count (-1 for infinite)
- Ping-pong mode (reverse on repeat)
- Delay before start
- Pause/resume control
- getValue as f64, i64, or u16
Example: animation_demo.zig comparing 5 easing functions
Tests: 12 animation tests, all pass
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
