- Add QRCode component using qrcode.react (SVG-based, H error correction)
- Add QRScanner component using html5-qrcode for camera-based scanning
- Update Receive page with real QR code and payment request amount
- Update Send page with QR scan button to auto-fill recipient address
- Support Synor payment URI format: synor:address?amount=X
- Add Dockerfile for web wallet with nginx serving
- Add web-wallet service to docker-compose.testnet.yml (port 17300)
- Fix TypeScript WebCrypto ArrayBuffer type issues
QR features:
- SVG rendering for crisp display at any size
- Error correction level H (30% recovery) for printed codes
- Camera permission handling with user-friendly error states
- Auto-fill amount when scanning payment requests