- Improve user verification in `authentication.php` by adding a check for user existence and throwing meaningful exceptions for missing users.
- Refactor `webauthn.php` to handle Base64URL decoding and COSE key normalization for consistent WebAuthn library compatibility.
- Extend error logging with additional context for debugging (e.g., public key hex representation).
- Add utility functions for Base64URL decoding and checking PEM/DER format.
- Update `passkeysRoute.php` to normalize public keys and handle errors gracefully during WebAuthn workflows.