Long-press a food → "Edit" opens EditFoodSheet with:
- Name and brand fields
- All macros: calories, protein, carbs, fat, sugar, fiber
- Base unit field
- Save calls PATCH /api/fitness/foods/{id}
- List refreshes after save
Also added updateFood() to FitnessAPI and UpdateFoodRequest model.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>