fix: Resolve Server Component serialization error on shared links

src/app/shared/[classSlug]/[type]/[token]/page.tsx

@@ -87,11 +87,6 @@ export default async function SharedPage(props: SharedPageProps) {
               }}
               retakeIds={null}
               isShared={true}
-              onFinished={() => {
-                // In shared mode, finishes local results display, when closed we can reload
-                // but QuizViewer doesn't handle the restart well in shared mode if we just close.
-                // We'll let it stay on results or the user can refresh.
-              }}
             />
           )}
         </div>

src/components/quizzes/QuizResults.tsx

@@ -9,7 +9,7 @@ interface QuizResultsProps {
   quiz: any; // QuizData
   attempt: any; // QuizAttempt
   onRetake: (missedIds: string[]) => void;
-  onClose: () => void;
+  onClose?: () => void;
 }
 
 export function QuizResults({ quiz, attempt, onRetake, onClose }: QuizResultsProps) {
@@ -72,12 +72,14 @@ export function QuizResults({ quiz, attempt, onRetake, onClose }: QuizResultsPro
         </div>
 
         <div className="flex justify-center gap-4">
-          <button
-            onClick={onClose}
-            className="px-6 py-2.5 rounded-lg border border-border text-text-heading font-medium hover:bg-bg-surface-alt transition-all duration-200 cursor-pointer"
-          >
-            Back to Quizzes
-          </button>
+          {onClose && (
+            <button
+              onClick={onClose}
+              className="px-6 py-2.5 rounded-lg border border-border text-text-heading font-medium hover:bg-bg-surface-alt transition-all duration-200 cursor-pointer"
+            >
+              Back to Quizzes
+            </button>
+          )}
           
           {missedIds.length > 0 && (
             <button

src/components/quizzes/QuizViewer.tsx

@@ -35,7 +35,7 @@ interface QuizViewerProps {
   };
   retakeIds: string[] | null;
   isShared?: boolean;
-  onFinished: () => void;
+  onFinished?: () => void;
 }
 
 export function QuizViewer({ quiz, retakeIds, isShared = false, onFinished }: QuizViewerProps) {