[conducted] Implement menu fade/slide transitions

[githumps]

Goal

Add smooth menu transitions to match Pokemon's polished UX feel.

Pokemon Menu Transitions

• Menus fade in (opacity 0 → 1 over ~200ms)
• Slight slide effect on open
• Cursor moves smoothly between options
• Sound effects sync with visual transitions

Implementation

1. Add CSS transitions to menu elements
2. Implement fade-in animation on menu open
3. Add smooth cursor movement (not instant jump)
4. Ensure 60fps performance on mobile
5. Add subtle slide animation (~5-10px)

Priority: P2 | Estimate: 1-2 hours