FEAT: Smart card auto-unlock on insertion

[andrinoff]

Is your feature request related to a problem?

Smart card / YubiKey use requires manual unlock steps.

Describe the solution you'd like

Detect card insertion and prompt/unlock automatically for PGP operations.

Describe alternatives you've considered

Manual unlock each operation.

Additional context

See pgp/smartcard.go and pgp/yubikey.go.

[floatpanebot]

Thanks for the suggestion!

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