Refactor slot editing to use searchable selections

Instead of having to type in exactly the name of events or shifts and
then hope you remembered it right, replace these interactions with the
custom select component that gives a complete list of the available
choices and allows quickly searching for the right one.

components/TableScheduleEvents.vue

@@ -37,9 +37,8 @@
 							<input
 								type="checkbox"
 								:disabled="!accountStore.canEditPublic"
-								:value="!event.crew"
 								:checked="!event.crew"
-								@change="event.crew = !($event.target as HTMLInputElement).value"
+								@change="event.crew = !event.crew"
 							>
 						</td>
 						<td>{{ event.slots.size ? event.slots.size : "" }}</td>