26.7.20260724

• SECURITY: this release fixes multiple security vulnerabilities, everyone is strongly adviced to update to it!
• Admin: fix lost background image, if config from apps like calendar or addressbook is saved
• Adressbook/other apps: fix merge-print with converting to PDF failed after last security release
• Auth/OpenIDConnect: only use unverified email, if explicitly enabled in configuration
• ImportExport: fix stalled installation caused by last security hardening
• ProjectManager: fix SQL error when searching in element list for 2 or more keywords