Route icon results through UI events (T-607)

core/application/event.go

@@ -17,6 +17,8 @@ const (
 	EventAppStarted        EventType = "AppStarted"
 	EventAppExited         EventType = "AppExited"
 	EventLicenseChanged    EventType = "LicenseChanged"
+	EventIconReady         EventType = "IconReady"
+	EventIconFailed        EventType = "IconFailed"
 )
 
 var validEventTypes = map[EventType]struct{}{
@@ -33,6 +35,8 @@ var validEventTypes = map[EventType]struct{}{
 	EventAppStarted:        {},
 	EventAppExited:         {},
 	EventLicenseChanged:    {},
+	EventIconReady:         {},
+	EventIconFailed:        {},
 }
 
 // Valid reports whether eventType is part of the documented event contract.