What's new
- SoGo CalDAV support — parse unprefixed
<calendar xmlns="urn:ietf:params:xml:ns:caldav"/>in PROPFIND responses (SoGo doesn't use thecal:orC:prefix like other servers) - CalDAV observability — PROPFIND requests now log URL, depth, and response status at DEBUG level; write-back path logs push attempts, successes, and skip reasons
- Write-back tracing — credential decryption failures and "no source configured" skips are now logged instead of silently returning