Implement QR code scan UI screen based on attached design:

Design reference: https://www.figma.com/design/UjbBQIFKATd1DisTBRsMdd/Wallet-Management-System?node-id=377-10794&t=llo8W5FgdlQFGYJE-4

Acceptance criteria

• Screen matches the provided design
• Responsive across supported screen sizes
• No business logic or API integration included