Replace polling with server sent events

scripts/Actions/Notifications.ts

@@ -31,18 +31,6 @@ export async function markNotificationsAsSeen(arn: AnimeNotifier) {
 		credentials: "same-origin"
 	})
 
-	// Update notification counter
-	if("serviceWorker" in navigator) {
-		// If we have service worker support, broadcast the "notifications marked as seen" message to all open tabs
-		arn.serviceWorkerManager.postMessage({
-			type: "broadcast",
-			realType: "notifications marked as seen"
-		})
-	} else {
-		// If there is no service worker, update the counter on this tab
-		arn.notificationManager.update()
-	}
-
 	// Update notifications
 	arn.reloadContent()
 }