Randomizer can sometimes pick duplicate activites, colliding and showing nothing

Title, but notably ONLY when "Unique games only" is unset.
This allows for the same game to roll twice, and presumably the same activity. The same activity rolling causes a collision. Generated activities should **always** be unique.

<img width="967" height="1160" alt="Image" src="https://github.com/user-attachments/assets/3d5e56f3-430d-4f59-905c-03bfd56ea186" />