Plan game nights with the new Playgroup Planner

Playgroups now have a Planner tab for scheduling actual game sessions: pick a format, location, start and end time, and a maximum number of players, and other members can sign up. Once a session fills up, further sign-ups land on a waitlist automatically — and if someone confirmed drops out, the longest-waiting person on the waitlist gets bumped up to take their spot, so a freed-up seat never just sits empty.