Put the next appointment on the Infograph bezel

The position asked for is the bezel slot: a circular complication plus a label
that arcs across the top, where the tick marks otherwise are. ClockKit called
that family graphicBezel; in WidgetKit it is an accessoryCircular widget with
.widgetLabel attached. Nothing was attached, so that arc stayed empty while
Apple's Calendar fills it — which is the difference that was visible on the
watch and invisible in every check made here.

All three circular kinds now carry it. Faces without a bezel slot ignore the
label, so there is no cost to always providing it.

cornerLabel becomes eventLabel: the same text serves the corner edge and the
bezel arc, and the old name claimed otherwise.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CalendarrWatchComplications/CornerComplicationViews.swift

@@ -26,7 +26,7 @@ struct CornerCountdownComplicationView: View {
             }
         }
         .widgetLabel {
-            Text(WatchComplicationSupport.cornerLabel(next, at: entry.date, language: entry.language))
+            Text(WatchComplicationSupport.eventLabel(next, at: entry.date, language: entry.language))
         }
     }
 }