Styles not added to nested shadowRoots

The helper.js script to handle the boundries doesn't work for nested shadowRoots when using web components. You can see the issue on the Preact version. 

<img width="879" height="382" alt="Image" src="https://github.com/user-attachments/assets/a1517daf-33d4-470d-8553-8752d33f5ebe" />

