reimplement: fetch identity, create p12 with password NULL, deleteHostCertificateFromKeychain, deleteAllItemsFromKeychain, remove redundant SecItemAdd of identity
add: UUID label, extractSecCertificateDigest, print SHA256 for cert
fix: revoke accidentally written UI code
issue: https://invent.kde.org/ruixuantu/kdeconnect-mac/-/issues/1
Edited by Ruixuan Tu