Add homework system (admin, student, curator)

Admin:
- HomeworkEditor in lesson page: create/update/delete assignment description

Student:
- HomeworkSection in lesson page: view assignment, submit text + files
- Resubmission allowed until curator gives feedback
- Shows feedback from curator with date and name

Curator:
- New layout with Second Brain dark sidebar (replaces green theme)
- /curator/dashboard: stats cards (pending, total, reviewed this week)
- /curator/homework: list of all submissions, pending highlighted
- /curator/homework/[id]: review submission, write feedback, redirect after send

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

src/app/curator/homework/[submissionId]/actions.ts

@@ -0,0 +1,20 @@
+"use server";
+
+import { prisma } from "@/lib/prisma";
+import { auth } from "@/lib/auth";
+import { headers } from "next/headers";
+import { revalidatePath } from "next/cache";
+
+export async function submitFeedback(submissionId: string, text: string) {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session || (session.user.role !== "curator" && session.user.role !== "admin")) {
+    throw new Error("Forbidden");
+  }
+
+  await prisma.homeworkFeedback.create({
+    data: { submissionId, curatorId: session.user.id, text },
+  });
+
+  revalidatePath("/curator/homework");
+  revalidatePath(`/curator/homework/${submissionId}`);
+}

src/app/curator/homework/[submissionId]/feedback-form.tsx

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+"use client";
+
+import { useState, useTransition } from "react";
+import { useRouter } from "next/navigation";
+import { submitFeedback } from "./actions";
+
+export function FeedbackForm({ submissionId }: { submissionId: string }) {
+  const [text, setText] = useState("");
+  const [pending, startTransition] = useTransition();
+  const router = useRouter();
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    if (!text.trim()) return;
+    startTransition(async () => {
+      await submitFeedback(submissionId, text.trim());
+      router.push("/curator/homework");
+    });
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="space-y-3">
+      <p className="text-xs font-bold uppercase tracking-widest" style={{ color: "var(--muted-foreground)" }}>
+        Написать фидбек
+      </p>
+      <textarea
+        value={text}
+        onChange={(e) => setText(e.target.value)}
+        required
+        placeholder="Напишите обратную связь студенту..."
+        style={{
+          border: "2px solid var(--border)",
+          background: "var(--background)",
+          outline: "none",
+          width: "100%",
+          padding: "0.5rem 0.75rem",
+          fontSize: "0.875rem",
+          fontFamily: "inherit",
+          resize: "vertical",
+          minHeight: "120px",
+        }}
+        onFocus={(e) => (e.currentTarget.style.borderColor = "var(--foreground)")}
+        onBlur={(e) => (e.currentTarget.style.borderColor = "var(--border)")}
+      />
+      <button
+        type="submit"
+        disabled={pending || !text.trim()}
+        className="btn-aubade btn-aubade-accent px-5 py-2 text-sm"
+        style={{ opacity: pending || !text.trim() ? 0.6 : 1 }}
+      >
+        {pending ? "Отправка..." : "Отправить фидбек"}
+      </button>
+    </form>
+  );
+}

src/app/curator/homework/[submissionId]/page.tsx

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+import { prisma } from "@/lib/prisma";
+import { notFound } from "next/navigation";
+import Link from "next/link";
+import { FeedbackForm } from "./feedback-form";
+
+interface Props {
+  params: Promise<{ submissionId: string }>;
+}
+
+function formatSize(bytes: number) {
+  if (bytes < 1024) return `${bytes} Б`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} КБ`;
+  return `${(bytes / 1024 / 1024).toFixed(1)} МБ`;
+}
+
+export default async function SubmissionPage({ params }: Props) {
+  const { submissionId } = await params;
+
+  const submission = await prisma.homeworkSubmission.findUnique({
+    where: { id: submissionId },
+    include: {
+      user: { select: { name: true, email: true } },
+      feedbacks: {
+        include: { curator: { select: { name: true } } },
+        orderBy: { createdAt: "desc" },
+      },
+      homework: {
+        include: {
+          lesson: {
+            select: {
+              title: true,
+              module: { select: { title: true, course: { select: { title: true } } } },
+            },
+          },
+        },
+      },
+    },
+  });
+
+  if (!submission) notFound();
+
+  const files = (submission.files as { name: string; url: string; size: number }[]) ?? [];
+  const isReviewed = submission.feedbacks.length > 0;
+
+  return (
+    <div className="p-8 max-w-2xl">
+      <nav className="text-xs mb-6 uppercase tracking-widest" style={{ color: "var(--muted-foreground)" }}>
+        <Link href="/curator/homework" className="hover:underline">ДЗ на проверку</Link>
+        <span className="mx-2">/</span>
+        <span style={{ color: "var(--foreground)" }}>{submission.user.name}</span>
+      </nav>
+
+      {/* Meta */}
+      <div className="mb-6">
+        <h1 className="text-xl font-bold">{submission.homework.lesson.title}</h1>
+        <p className="text-sm mt-1" style={{ color: "var(--muted-foreground)" }}>
+          {submission.homework.lesson.module.course.title} · {submission.homework.lesson.module.title}
+        </p>
+      </div>
+
+      {/* Student info */}
+      <div className="flex items-center justify-between px-4 py-3 mb-6" style={{ border: "2px solid var(--border)", background: "var(--color-surface)" }}>
+        <div>
+          <p className="font-medium text-sm">{submission.user.name}</p>
+          <p className="text-xs" style={{ color: "var(--muted-foreground)" }}>{submission.user.email}</p>
+        </div>
+        <p className="text-xs" style={{ color: "var(--muted-foreground)" }}>
+          Сдано {new Date(submission.submittedAt).toLocaleDateString("ru-RU")}
+        </p>
+      </div>
+
+      {/* Homework description */}
+      <div className="mb-4">
+        <p className="text-xs font-bold uppercase tracking-widest mb-2" style={{ color: "var(--muted-foreground)" }}>Задание</p>
+        <div className="px-4 py-3 text-sm whitespace-pre-wrap" style={{ border: "2px solid var(--border)", background: "var(--color-surface)" }}>
+          {submission.homework.description}
+        </div>
+      </div>
+
+      {/* Student answer */}
+      <div className="mb-4">
+        <p className="text-xs font-bold uppercase tracking-widest mb-2" style={{ color: "var(--muted-foreground)" }}>Ответ студента</p>
+        {submission.text ? (
+          <div className="px-4 py-3 text-sm whitespace-pre-wrap" style={{ border: "2px solid var(--border)" }}>
+            {submission.text}
+          </div>
+        ) : (
+          <p className="text-sm italic" style={{ color: "var(--muted-foreground)" }}>Текст не добавлен</p>
+        )}
+      </div>
+
+      {/* Files */}
+      {files.length > 0 && (
+        <div className="mb-6">
+          <p className="text-xs font-bold uppercase tracking-widest mb-2" style={{ color: "var(--muted-foreground)" }}>Прикреплённые файлы</p>
+          <div className="space-y-1">
+            {files.map((f) => (
+              <a
+                key={f.url}
+                href={f.url}
+                target="_blank"
+                rel="noopener noreferrer"
+                className="flex items-center gap-3 px-3 py-2 text-sm"
+                style={{ border: "2px solid var(--border)" }}
+              >
+                <span>📎</span>
+                <span className="flex-1 underline">{f.name}</span>
+                <span className="text-xs" style={{ color: "var(--muted-foreground)" }}>{formatSize(f.size)}</span>
+              </a>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Existing feedback */}
+      {submission.feedbacks.map((fb) => (
+        <div key={fb.id} className="mb-4 px-4 py-3" style={{ border: "2px solid var(--foreground)", background: "var(--accent)" }}>
+          <div className="flex items-center justify-between mb-1">
+            <p className="text-xs font-bold uppercase tracking-widest">Фидбек</p>
+            <span className="text-xs" style={{ color: "var(--muted-foreground)" }}>
+              {fb.curator.name} · {new Date(fb.createdAt).toLocaleDateString("ru-RU")}
+            </span>
+          </div>
+          <p className="text-sm whitespace-pre-wrap">{fb.text}</p>
+        </div>
+      ))}
+
+      {/* Feedback form */}
+      {!isReviewed && <FeedbackForm submissionId={submissionId} />}
+    </div>
+  );
+}

src/app/curator/homework/page.tsx

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+import { prisma } from "@/lib/prisma";
+import Link from "next/link";
+
+export default async function HomeworkListPage() {
+  const submissions = await prisma.homeworkSubmission.findMany({
+    orderBy: { submittedAt: "desc" },
+    include: {
+      user: { select: { name: true, email: true } },
+      feedbacks: { select: { id: true } },
+      homework: {
+        include: {
+          lesson: {
+            select: {
+              title: true,
+              module: { select: { title: true, course: { select: { title: true } } } },
+            },
+          },
+        },
+      },
+    },
+  });
+
+  const pending = submissions.filter((s) => s.feedbacks.length === 0);
+  const reviewed = submissions.filter((s) => s.feedbacks.length > 0);
+
+  return (
+    <div className="p-8 max-w-3xl">
+      <h1 className="text-2xl font-bold mb-1">Домашние задания</h1>
+      <p className="text-sm mb-8" style={{ color: "var(--muted-foreground)" }}>
+        {pending.length} ожидают проверки · {reviewed.length} проверено
+      </p>
+
+      {pending.length > 0 && (
+        <div className="mb-8">
+          <p className="text-xs font-bold uppercase tracking-widest mb-3" style={{ color: "var(--muted-foreground)" }}>
+            Ожидают проверки
+          </p>
+          <div className="space-y-2">
+            {pending.map((s) => (
+              <SubmissionRow key={s.id} submission={s} pending />
+            ))}
+          </div>
+        </div>
+      )}
+
+      {reviewed.length > 0 && (
+        <div>
+          <p className="text-xs font-bold uppercase tracking-widest mb-3" style={{ color: "var(--muted-foreground)" }}>
+            Проверено
+          </p>
+          <div className="space-y-2">
+            {reviewed.map((s) => (
+              <SubmissionRow key={s.id} submission={s} pending={false} />
+            ))}
+          </div>
+        </div>
+      )}
+
+      {submissions.length === 0 && (
+        <div className="card-aubade p-10 text-center">
+          <p className="text-3xl mb-2">📭</p>
+          <p className="font-bold">Работ пока нет</p>
+        </div>
+      )}
+    </div>
+  );
+}
+
+function SubmissionRow({
+  submission,
+  pending,
+}: {
+  submission: {
+    id: string;
+    submittedAt: Date;
+    user: { name: string; email: string };
+    homework: {
+      lesson: {
+        title: string;
+        module: { title: string; course: { title: string } };
+      };
+    };
+  };
+  pending: boolean;
+}) {
+  return (
+    <Link
+      href={`/curator/homework/${submission.id}`}
+      className="flex items-center gap-4 px-4 py-3 text-sm transition-colors"
+      style={{ border: `2px solid ${pending ? "var(--foreground)" : "var(--border)"}`, display: "flex" }}
+    >
+      <div className="flex-1 min-w-0">
+        <p className="font-medium truncate">{submission.user.name}</p>
+        <p className="text-xs truncate" style={{ color: "var(--muted-foreground)" }}>
+          {submission.homework.lesson.module.course.title} · {submission.homework.lesson.title}
+        </p>
+      </div>
+      <div className="text-right shrink-0">
+        <span
+          className="text-xs px-2 py-0.5"
+          style={{
+            border: "1px solid var(--border)",
+            background: pending ? "var(--foreground)" : "transparent",
+            color: pending ? "var(--background)" : "var(--muted-foreground)",
+          }}
+        >
+          {pending ? "Новое" : "Проверено"}
+        </span>
+        <p className="text-xs mt-1" style={{ color: "var(--muted-foreground)" }}>
+          {new Date(submission.submittedAt).toLocaleDateString("ru-RU")}
+        </p>
+      </div>
+    </Link>
+  );
+}