v0.9.3 — Pro Subscription Fixes

Fixed several issues with Pro subscription payments:

- Pro status no longer resets — a reputation recalculation was overwriting Pro accounts back to "verified" after every transaction. Your Pro tier now stays active for the full subscription period.

- Crossmark payments work end-to-end — fixed transaction hash extraction and removed fields that caused Crossmark to show a blank signing screen.

- Reliable payment verification — the backend now reads the actual delivered amount from the blockchain, with tolerance for price movement between checkout and verification.

- All 5 wallets supported — Pro payment uses the same unified signing handler as marketplace purchases. Xaman, Crossmark, GemWallet, Joey, and WalletConnect all work.