temp: debug coverImage value in lesson page

src/app/(student)/courses/[slug]/lessons/[lessonId]/page.tsx

@@ -126,6 +126,8 @@ export default async function LessonPage({ params }: Props) {
       {lesson.kinescopeId && (
         <div className="mb-8">
           <KinescopePlayer videoId={lesson.kinescopeId} poster={lesson.coverImage ?? undefined} />
+          {/* DEBUG: remove after fix */}
+          {isAdmin && <p style={{fontSize:11,color:"gray",marginTop:4}}>coverImage: {lesson.coverImage ?? "NULL"}</p>}
         </div>
       )}