daemon,ui: Send PIN over fd#162
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Instead of sending the PIN in the clear, where D-Bus clients can sniff the traffic, send a file descriptor. We use a unicast signal, so we trust D-Bus to deliver the file descriptor just to the intended recipient.
We use memfd_secret for hardening the file descriptor. This should be enabled by default on Linux 6.5+, which our target OS (Ubuntu 24.04) meets.