TECHNICAL UPDATE (BUG REPLICATION): I just managed to replicate the input validation bug inside the console.

As you can see in the screenshot below, when your regional settings use commas for decimals (e.g., my balance shows 430,26), the input field still physically allows you to type a dot (0.5 or 5.04).

The catastrophic UX failure happens when you press "Enter" right after typing. The form instantly submits the raw, un-sanitized input string to the backend before the frontend validation layer can block it or correctly alert the user.

The system breaks its own "USD 5.00 minimum" rule, bypasses proper error prevention, and immediately fires the payment request to Stripe/the gateway.

Here is the replication proof: https://ibb.co/HTY88MZ3