Fido: accept lowercase hybrid QR URI scheme

[Jadeiin]

Summary

Accept hybrid QR URI schemes case-insensitively in QrCodeData.parse().

HybridAuthenticateActivity currently accepts the FIDO:/ prefix with ignoreCase = true, but QrCodeData.parse() extracts the payload using the case-sensitive expression:

data.substringAfter(PREFIX_FIDO, "")

Android delivered a valid hybrid registration URI using a lowercase scheme:

fido:/...

The activity accepted the URI, but the parser failed to find the uppercase FIDO:/ prefix, decoded an empty payload, and returned null.

Fix

Validate the prefix case-insensitively and remove it by length:

if (!data.startsWith(PREFIX_FIDO, ignoreCase = true)) return null
val encoded = data.substring(PREFIX_FIDO.length)

This keeps the encoded payload unchanged while accepting valid casing variations.