Add UI to edit and display event notices

Add a warning like display of event notices to the event card and the
event slot card and indicate in the timesheet that an event has a
notice.  Also includes the input controls needed to edit the notice.

server/generate-demo-schedule.ts

@@ -43,6 +43,7 @@ let eventId = 1;
 const events = [
 	{
 		name: "Arcade",
+		notice: "No food or drinks allowed!\n\nClosed drinking containers are okay.",
 		description: "Play retro games!\n\nWe have anything from C64 to PS5.",
 		slots: [
 			"d1 12:00 4h clubhouse",
@@ -339,10 +340,11 @@ export function generateDemoSchedule(): ApiSchedule {
 		id: 111,
 		updatedAt: toIso(toDate(origin, "d-2", "10:01")),
 		events: events.map(
-			({ id, name, crew, description, slots }) => ({
+			({ id, name, crew, notice, description, slots }) => ({
 				id,
 				name,
 				crew,
+				notice,
 				description,
 				interested: eventCounts.get(id),
 				slots: slots.map(shorthand => toSlot(origin, shorthand, slotCounts, eventSlotIdToAssigned)),