Planner: clearer event cards, format filter, and change alerts

Events in the Planner now lead with what matters most: the format and the date, right at the top of the card. Underneath, a subtitle gives you the day of the week, the time, and the location, so you can scan a busy schedule at a glance instead of hunting for details. Speaking of busy schedules: there's a new "Filter by format" dropdown above the event list. Only care about Commander nights, or want to see everything without a format tag? Pick it from the list and the Planner narrows down instantly. Last one: if an organizer edits or cancels a session, everyone who signed up (including anyone on the waitlist) now gets an email letting them know, so plans don't get missed. Don't want these emails? Head to your Profile & settings page and turn off "Email me when an event I'm signed up for gets edited or cancelled" under Notifications.