### Problem/Motivation Preact package has a security vulnerability that needs to be remediated. https://github.com/advisories/GHSA-36hm-qxxp-pg3m/dependabot https://www.cve.org/CVERecord?id=CVE-2026-22028#adp-134c704f-9b21-4f2e-91b3-4a467353bcc0 #### Steps to reproduce ### Proposed resolution Update diagram-js to at least 15.15.1 ### Remaining tasks ### User interface changes ### API changes ### Data model changes