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3. Data Structures:
typescript
// Core interfaces
interface Product {
  id: ItemCodes;
  name: string;
  defaultCi: string;
  defaultButterfat: number;
  details: ProductDetail[];
}

interface Schedule {
  id: number | null;
  seq: number;
  product: ItemCodes;
  // ... other fields
}


4 Constants Organization:
typescript
// Single source of truth
export const PRODUCT_NAMES: Record<ItemCodes, string> = {...}
export const EDITABLE_CODES: ItemCodes[] = [...]
export const CONVERSION_FACTORS: { [key in ConversionType]: number } = {...}