feat: canvas-confetti exact replica + Quick Add callback fix
Confetti (matches ReactFlux/canvas-confetti exactly):
- 100 particles from bottom-right corner
- angle=120°, spread=70° (upper-left fan)
- Real physics: velocity + gravity
- 3 shapes: circles, rectangles, stars
- 12 vibrant colors
- Particles drift, spin, fade naturally
- Checkmark + 'Added!' overlay
Quick Add fix:
- onFoodAdded callback wired through FoodSearchView → AddFoodSheet
- Both AI Chat and Quick Add now dismiss → switch to fitness → confetti
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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