Add biometric authentication enrollment UI

- Create biometric API client with WebAuthn methods
- Add BiometricSettings component for credential management
- Support Face ID, Touch ID, Windows Hello enrollment
- Display list of enrolled credentials with metadata
- Add/remove/rename biometric credentials
- Check browser and platform authenticator support
- Integrate into settings page with animations

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

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

maternal-web/package.json

@@ -22,6 +22,7 @@
     "@mui/material": "^5.18.0",
     "@mui/material-nextjs": "^7.3.2",
     "@reduxjs/toolkit": "^2.9.0",
+    "@simplewebauthn/browser": "^13.2.0",
     "@tanstack/react-query": "^5.90.2",
     "axios": "^1.12.2",
     "date-fns": "^4.1.0",