Allow re-randomizing individual activities

In the events page, we should be able to re-roll individual activities. This helps if a majority of the rolls are solid but we don't like one or two. Green boxes signal a decent spot to put it IMO

<img width="917" height="1084" alt="Image" src="https://github.com/user-attachments/assets/df53c766-382f-42a6-97a7-3b324e867b29" />