[Bug]: preview annotation element picker does not work inside iframes

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. Save index.html from https://gist.github.com/tarik02/956272c178eea492edd8fdc30c9b03fe and serve it with any webserver (for example npx serve).
2. Open it in web-browser sidebar.
3. Use annotation tool and try to hover/select region/paint with it on two regions - outside iframe and inside iframe.

Expected behavior

Elements inside iframe selected, painted over - just like normal elements around.

Actual behavior

Iframe blocks any interaction of annotation tool.

Impact

Major degradation or frequent failure

Version or commit

main @ e408b0106768dc9672e8f9ffcecc0e6897ac4d0a

Environment

No response

Logs or stack traces

Screenshots, recordings, or supporting files

Трансляція_20260618_140429.webm

Workaround

No response

Reproduce the issue using the linked index.html fixture served locally, then inspect the annotation picker implementation under apps/web. Compare selection, hover, and painting behavior outside and inside the iframe; done means iframe elements can be interacted with like normal elements.