Refunds and payment dispute handling

Issue full or partial refunds from the order, and track card disputes alongside the payment they belong to.

Refunds shouldn't require logging into a separate payments dashboard. Authorized staff can now refund an order in full or in part directly from Claddio, with the refund recorded on the order.

If a buyer disputes a card payment, the dispute appears on the same payment record so finance and support can see what happened and respond.