Add a warning in case any of the slots are not configured

[payloadartist]

Fixes #11543 by adding a warning message in Qt when any of the slots aren't configured.

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[droidmonkey]

This is fine but not a solution to the problem because you need to be monitoring the console to see it. Prefer a smarter message be displayed on the open widget.

[droidmonkey]

I'm thinking of something like: "Hardware keys found, but no slots are configured"

[payloadartist]

@droidmonkey indeed that message is more intuitive. 2 points:

• what if we have multiple YubiKeys for work and personal? I feel serial should be also shown
• what if the other slot is misconfigured? there are two slots, long and short press so we need to convey the same to the user for better debugging

cheers

[droidmonkey]

This message would only show if:

1. One or more hardware keys are detected
2. None of them have slots configured for challenge-response use

During this scenario it doesn't matter what the serial numbers are of the keys, we are letting the user know that none of them are setup for KeePassXC. The console message shows more detailed detection information if they so desire.

If a user has at least one key/slot properly configured it is assumed they know how to do it and they know what they are doing.

[payloadartist]

Thanks @droidmonkey, makes sense!

[droidmonkey]

This is being implemented under #11609