Artifact group labels should not have the word "Rules: " as a prefix

Testing #309326

It would be cleaner if we do not use the "Rules" as a prefix. And the labels are just "Screenshots", "Plans", "Stylesheets". And then on hover if you want you can explain the rule part of the story.

<img width="312" height="114" alt="Image" src="https://github.com/user-attachments/assets/5eee2f18-d671-4ac2-9d75-f8fe555fd85a" />