Participant Sign Up Times

To better manage "over-prep" parties, this feature adds a visible timestamp for each participant. This allows hosts to objectively identify who joined first when a server reaches capacity or a specific role is overfilled. By surfacing this data, hosts can implement a fair "first-come, first-served" policy when they need to remove players to make room for essential roles. The timestamp should remain tied to the user’s initial entry into the party, even if they switch roles. This ensures transparency and reduces administrative friction during high-traffic events.