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Import of `formatMoneyIntl` does not exist in `@/lib/currency`

src/lib/payments.ts:14

The AI edit introduced a named import that was never defined. The module resolves at build time but throws at runtime the first time checkout renders.

Suggested fix — Replace with the existing `formatCurrency(amount, code)` helper exported from `@/lib/currency`.

Cart state shape changed in one file but not its three consumers

src/hooks/useCart.ts:62

`items` became `lines` here, while CartDrawer, CheckoutSummary and the order mapper still read `items` — they now render an empty cart with no error.

Suggested fix — Rename back to `items`, or update all three consumers in the same change.

Order lookup trusts a client-supplied user id

src/routes/api/orders.ts:31

The handler filters by `body.userId` instead of the authenticated session, so any signed-in caller can read another customer's orders.

Suggested fix — Filter on the verified session user id and drop `userId` from the request body.

Discount guard was removed by a later AI edit

src/lib/discount.ts:22

An earlier version rejected negative percentages. The regenerated function dropped the guard, so a negative discount raises the price.

Suggested fix — Re-add `if (percent < 0 || percent > 100) throw new Error('Invalid discount')`.