- Add QRScanner component with camera and image upload
- Add QR code download button with auto-naming (SeedPGP_DATE_TIME.png)
- Split state for backup/restore (separate public/private keys and passwords)
- Improve QR generation settings (margin: 4, errorCorrection: M)
- Fix Safari camera permissions and Continuity Camera support
- Add React timing fix for Html5Qrcode initialization
Features:
- Camera scanning with live preview
- Image file upload scanning
- Automatic SEEDPGP1 validation
- User-friendly error messages
- 512x512px high-quality QR generation
