Base Integrity Check broken for new bases

[brady77]

Describe the bug
Base Integrity Check on new bases fails with:

• Something went wrong
• An unexpected issue occurred. Please try again later.
• Error id: 136d996603834888a157d08c12248f5d
• ErrorMessage: canShowPreview is not defined

To Reproduce
Steps to reproduce the behavior:

1. Create a new base
2. Open newly created base
3. Go to Left menu -> More (three dots) -> Design -> Integrity check -> Click on 'Check' button
4. See error

Expected behavior
After clicking on 'Check' button a message should be shown (something like "All good") or a page that lists integrity issues.

** Client:**

• OS: macOS
• Browser: Firefox 150.0.1

Platform

• OS: Ubuntu server 25.10
• Installation type: docker-standalone
• Instance ID: aa1da60d-5a9c-44c3-9071-4f3113c87eca
• App version: release.2026-05-06T00-14-49Z.1601

Additional context
For older bases (created before the release.2026-05-06T00-14-49Z.1601) the Integrity Check works.