Implements 10 new visual effects:
- slide-out-top: Slide out towards the top
- slide-out-bottom: Slide out towards the bottom
- slide-out-left: Slide out towards the left
- slide-out-right: Slide out towards the right
- blink: Rapid on/off blinking (6 blinks during animation)
- focus-in: Come into focus with scale and opacity
- blur-out: Go out of focus with reduced scale and opacity
- shadow-drop: Drop down from above with shadow simulation
- shadow-pop: Pop forward with scale bounce effect
- rotate-center: Rotate around center point with line offsets
All effects registered in get_effect() and list_effects().
Fixed clippy warning: use unsigned_abs() instead of abs().
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>