🐛(frontend) fix missing participant name in recording toaster

Restore participant name display in transcription and recording toast
notifications that was accidentally removed in recent changes.

Simple regression fix to ensure proper participant identification in
notification messages.

src/frontend/src/features/notifications/MainNotificationToast.tsx

@@ -98,6 +98,7 @@ export const MainNotificationToast = () => {
         case NotificationType.ScreenRecordingLimitReached:
           toastQueue.add(
             {
+              participant,
               type: notification.type,
             },
             { timeout: NotificationDuration.ALERT }