JetBrains: fix panda bug

Created by: vdavid

Fixes https://github.com/sourcegraph/sourcegraph/issues/38279

It took a lot of time and trying manual invalidations and repaints, etc., but then I found this SO question where the code mentioned in the question just works. 🎉

Test plan

• Tested it: 20-sec Loom

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.