Authorize Visa transactions and route to crypto on-ramp.
on /root/visa-pos-api/static/card-payment.html
(or card2bank.html / card2crypto.html — works on any page that has the
existing transaction log in localStorage under key 'cardpay_txns').
This adds:
- "Refund" button on each row of the transaction log (auto-injected on render)
- A modal dialog to enter refund amount + reason
- A "Reverse Auth (Void)" action for unsettled transactions
- Calls /api/card/refund and /api/card/reverse from the new refund module
Does NOT modify any existing JS. Hooks via MutationObserver on the tx log.
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