Fixed: Color unaired items in agenda view

Closes #5477

frontend/src/Calendar/Agenda/AgendaEvent.css

@@ -103,6 +103,10 @@
   composes: premiere from '~Calendar/Events/CalendarEvent.css';
 }
 
+.unaired {
+  composes: unaired from '~Calendar/Events/CalendarEvent.css';
+}
+
 @media only screen and (max-width: $breakpointSmall) {
   .event {
     flex-direction: column;

frontend/src/Calendar/Agenda/AgendaEvent.css.d.ts

@@ -17,6 +17,7 @@ interface CssExports {
   'seriesTitle': string;
   'statusIcon': string;
   'time': string;
+  'unaired': string;
   'underlay': string;
   'unmonitored': string;
 }