feat: add QR code for Revolut payment link

- Install react-qr-code package for QR code generation
- Replace placeholder with actual QR code component in ViewLocationCard
- QR code displays Revolut payment URL with amount, currency, and profile
- Center-aligned QR code (200x200px) in white container with border
- Extract revolutPaymentUrl to single variable for reuse in QR code and link

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -36,6 +36,7 @@
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "react-infinite-scroll-component": "^6.1.0",
+    "react-qr-code": "^2.0.18",
     "react-toastify": "^10.0.6",
     "tailwindcss": "^3.4.0",
     "typescript": "5.2.2",