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/admin/courses/[courseId]/modules/[moduleId]/lessons/[lessonId]/homework-actions.ts

@@ -0,0 +1,27 @@
+"use server";
+
+import { prisma } from "@/lib/prisma";
+import { auth } from "@/lib/auth";
+import { headers } from "next/headers";
+import { revalidatePath } from "next/cache";
+
+async function requireAdmin() {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session || session.user.role !== "admin") throw new Error("Forbidden");
+}
+
+export async function saveHomework(lessonId: string, description: string) {
+  await requireAdmin();
+  await prisma.homework.upsert({
+    where: { lessonId },
+    update: { description },
+    create: { lessonId, description },
+  });
+  revalidatePath(`/admin/courses`);
+}
+
+export async function deleteHomework(lessonId: string) {
+  await requireAdmin();
+  await prisma.homework.delete({ where: { lessonId } });
+  revalidatePath(`/admin/courses`);
+}

src/app/admin/courses/[courseId]/modules/[moduleId]/lessons/[lessonId]/page.tsx

@@ -3,6 +3,7 @@ import { notFound } from "next/navigation";
 import Link from "next/link";
 import { LessonEditor } from "@/components/admin/lesson-editor";
 import { LessonFilesManager } from "@/components/admin/lesson-files-manager";
+import { HomeworkEditor } from "@/components/admin/homework-editor";
 
 interface Props {
   params: Promise<{ courseId: string; moduleId: string; lessonId: string }>;
@@ -15,6 +16,7 @@ export default async function LessonEditorPage({ params }: Props) {
     where: { id: lessonId },
     include: {
       files: { orderBy: { createdAt: "asc" } },
+      homework: true,
       module: {
         include: { course: { select: { title: true, slug: true } } },
       },
@@ -52,12 +54,20 @@ export default async function LessonEditorPage({ params }: Props) {
       </div>
 
       {/* Files section */}
-      <div className="card-aubade p-6">
+      <div className="card-aubade p-6 mb-6">
         <p className="text-xs font-bold uppercase tracking-widest mb-4" style={{ color: "var(--muted-foreground)" }}>
           Файлы и материалы
         </p>
         <LessonFilesManager lessonId={lessonId} initialFiles={lesson.files} />
       </div>
+
+      {/* Homework section */}
+      <div className="card-aubade p-6">
+        <p className="text-xs font-bold uppercase tracking-widest mb-4" style={{ color: "var(--muted-foreground)" }}>
+          Домашнее задание
+        </p>
+        <HomeworkEditor lessonId={lessonId} initial={lesson.homework} />
+      </div>
     </div>
   );
 }