- Add qr_string and qr_expires_at to Order interface
- Implement 10-second polling for payment status
- Add countdown timer for QR expiration
- Display QR code inline for pending QRIS payments
- Show "Menunggu pembayaran" with spinner while polling
- Add fallback button for payments without QR
Features:
- QR code rendered with qrcode.react library
- Real-time countdown timer (minutes:seconds)
- Auto-refresh when payment detected
- Clean up polling interval on unmount
- Memoized fetchOrder to prevent excessive re-renders
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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