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Item & PriceDescriptionAction
Apples
£2.99
Fresh red apples, crisp and sweet.
Bananas
£1.49
Ripe bananas rich in potassium.
Milk
£1.89
Creamy whole milk for daily use.
Bread
£2.49
Whole grain brown bread.

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const addToCart = (product: Product) => {
    setCart(prev => {
      const existing = prev.find(i => i.product.id === product.id)
      if (existing) {
        return prev.map(i =>
          i.product.id === product.id ? { ...i, quantity: i.quantity + 1 } : i,
        )}
      return [...prev, { product, quantity: 1 }]
    })}