Browser extension code intel popup styles regression on GitLab

Created by: taras-yemets

Browser extension version: current main branch, not published yet.

Expected	Actual

Steps to reproduce:

• run the browser extension locally (sg run bext and load build)
• open file or diff view on GitLab, hover over any token and check the code intel popup styles

Potentially related to:

• https://github.com/sourcegraph/sourcegraph/issues/34184
• https://github.com/sourcegraph/sourcegraph/pull/34859