Investigate warnings if running on non-Secure Enclave device, or no Biometric set.

We should warn users on first use of app if they are running on a non-secure enclave device (I'm not sure this is possible, but maybe QR vault can run iPod Touch 5th or 6th? I think iPod touch 7th has a Secure Enclave chip but no biometric).

There are also old Macs with no Secure Enclave but can run Catalina and Big Sur, thus might be able to run Gordian QR Tool once we have universal build.

Similarly, if no biometric has been established at all, and only a pin is set, we should warn users.

This should apply to all of our apps, so I've assigned this to Wolf to investigate a library that can be used with both UIKit and SwiftUI apps to test for these things, and maybe network connectivity.