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CRITICAL

Checkout breaks when the cart is empty

Anyone who clicks “Pay now” with an empty cart sees a frozen screen. 14 users hit this in the last hour.

Fix the bug where clicking "Pay now" crashes the checkout page. The error is "TypeError: Cannot read properties of null (reading 'reduce')" in handlePayment — the cart items list is null when the cart is empty. Add a guard so an empty cart shows "Your cart is empty" instead of crashing. After the fix, clicking Pay now with an empty cart should never throw an error.

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