Fix quiz attempts page: fetch users separately (no User relation on QuizAttempt)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/admin/quizzes/[quizId]/page.tsx

@@ -13,20 +13,13 @@ export default async function AdminQuizAttemptsPage({ params }: Props) {
     where: { id: quizId },
     include: {
       questions: { orderBy: { order: "asc" } },
-      attempts: {
-        orderBy: { completedAt: "desc" },
-        include: {
-          user: { select: { name: true, email: true } },
-        },
-      },
+      attempts: { orderBy: { completedAt: "desc" } },
       lesson: {
         select: {
-          id: true,
           title: true,
           module: {
             select: {
-              id: true,
-              course: { select: { id: true, title: true } },
+              course: { select: { title: true } },
             },
           },
         },
@@ -36,8 +29,12 @@ export default async function AdminQuizAttemptsPage({ params }: Props) {
 
   if (!quiz) notFound();
 
-  const courseId = quiz.lesson.module.course.id;
-  const moduleId = quiz.lesson.module.id;
+  const userIds = [...new Set(quiz.attempts.map((a) => a.userId))];
+  const users = await prisma.user.findMany({
+    where: { id: { in: userIds } },
+    select: { id: true, name: true, email: true },
+  });
+  const userMap = Object.fromEntries(users.map((u) => [u.id, u]));
 
   return (
     <div className="p-8 max-w-4xl">
@@ -67,6 +64,7 @@ export default async function AdminQuizAttemptsPage({ params }: Props) {
         <div className="space-y-4">
           {quiz.attempts.map((attempt) => {
             const answers = attempt.answers as Record<string, string>;
+            const user = userMap[attempt.userId];
             const date = new Date(attempt.completedAt).toLocaleString("ru-RU", {
               day: "2-digit",
               month: "2-digit",
@@ -83,9 +81,9 @@ export default async function AdminQuizAttemptsPage({ params }: Props) {
               >
                 <div className="flex items-center justify-between gap-2">
                   <div>
-                    <p className="text-sm font-medium">{attempt.user.name}</p>
+                    <p className="text-sm font-medium">{user?.name ?? "—"}</p>
                     <p className="text-xs" style={{ color: "var(--muted-foreground)" }}>
-                      {attempt.user.email}
+                      {user?.email ?? attempt.userId}
                     </p>
                   </div>
                   <span className="text-xs" style={{ color: "var(--muted-foreground)" }}>
@@ -93,7 +91,7 @@ export default async function AdminQuizAttemptsPage({ params }: Props) {
                   </span>
                 </div>
 
-                <div className="space-y-2 pt-1" style={{ borderTop: "1px solid var(--border)" }}>
+                <div className="space-y-2 pt-2" style={{ borderTop: "1px solid var(--border)" }}>
                   {quiz.questions.map((q, idx) => (
                     <div key={q.id}>
                       <p