feat: canvas-confetti style celebration + Quick Add callback
Confetti:
- 60 particles in 3 layered bursts (like canvas-confetti)
- Circles, rectangles, stars in 12 vibrant colors
- Physics: drift, spin, gravity, fade, scale
- Checkmark + 'Added!' text with spring animation
- Haptic feedback
Quick Add:
- FoodSearchView + AddFoodSheet now have onFoodAdded callback
- After adding from Quick Add: dismiss → fitness tab → confetti
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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