// features/cart/cartSelectors.js

// Selector simple
export const selectCartItems = state => state.cart.items;
export const selectCartTotal = state => state.cart.total;

// Selector calculé
export const selectCartItemCount = state =>
    state.cart.items.reduce((count, item) => count + item.quantity, 0);

// Utilisation
function CartIcon() {
    const itemCount = useSelector(selectCartItemCount);
    return <span className="cart-icon">🛒 {itemCount}</span>;
}