fix(editor): Prevent dialog overlay from rendering on top of AI Assistant (no-changelog)

[MiloradFilipovic]

Summary

Check the Linear ticket comments for more details.

Related Linear tickets, Github issues, and Community forum posts

Fixes ADO2-79

Review / Merge checklist

• [ ] PR title and summary are descriptive. (conventions)
• [ ] Docs updated or follow-up ticket created.
• [ ] Tests included.
• [ ] PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)