Swift: Start passkey registration

Fetches credential creation options to register a new passkey for the signed-in user.

• Pass the returned options (W3C PublicKeyCredentialCreationOptions) to the platform authenticator.
• After running the authenticator, submit the result with verifyPasskeyRegistration(challengeId:credentialResponse:).

Examples

Get passkey registration options

// @_spi(Experimental) import Supabase
let options: PasskeyRegistrationOptions = try await supabase.auth.getPasskeyRegistrationOptions()
// Hand options.options to the platform authenticator.