Add homework review workflow: statuses, audio, file attachments, tabs

- HomeworkSubmission: add status (PENDING/REVIEWING/APPROVED/REJECTED) + statusAt
- HomeworkFeedback: add files (Json) + audioUrl fields
- Curator detail page: meta table, content tabs, feedback history with audio/files
- FeedbackForm: file upload, audio recorder (Web Audio API + S3), action buttons
- AudioRecorder component: record → preview → upload to S3
- ContentTabs: toggle between homework description and lesson content (TipTap read-only)
- Homework list: 4-color status badges with proper filtering
- API routes: /api/curator/upload and /api/curator/audio-upload

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

src/app/curator/homework/page.tsx

@@ -38,8 +38,10 @@ export default async function HomeworkListPage({ searchParams }: Props) {
           },
         }
       : {}),
-    ...(status === "pending" ? { feedbacks: { none: {} } } : {}),
-    ...(status === "reviewed" ? { feedbacks: { some: {} } } : {}),
+    ...(status === "pending" ? { status: "PENDING" } : {}),
+    ...(status === "reviewing" ? { status: "REVIEWING" } : {}),
+    ...(status === "approved" ? { status: "APPROVED" } : {}),
+    ...(status === "rejected" ? { status: "REJECTED" } : {}),
   };
 
   const [submissions, total, courses] = await Promise.all([
@@ -50,7 +52,7 @@ export default async function HomeworkListPage({ searchParams }: Props) {
       take: PAGE_SIZE,
       include: {
         user: { select: { name: true, email: true } },
-        feedbacks: { select: { id: true } },
+        feedbacks: { select: { id: true }, take: 1 },
         homework: {
           include: {
             lesson: {
@@ -69,7 +71,7 @@ export default async function HomeworkListPage({ searchParams }: Props) {
 
   const totalPages = Math.ceil(total / PAGE_SIZE);
 
-  const pendingCount = submissions.filter((s) => s.feedbacks.length === 0).length;
+  const pendingCount = submissions.filter((s) => s.status === "PENDING").length;
 
   function pageUrl(p: number) {
     const params = new URLSearchParams();
@@ -109,16 +111,19 @@ export default async function HomeworkListPage({ searchParams }: Props) {
       ) : (
         <div className="space-y-1.5">
           {submissions.map((s) => {
-            const isPending = s.feedbacks.length === 0;
+            const statusMap: Record<string, { label: string; bg: string; color: string; border: string }> = {
+              PENDING:   { label: "Новое",           bg: "var(--foreground)",   color: "var(--background)", border: "var(--foreground)" },
+              REVIEWING: { label: "На рассмотрении", bg: "oklch(0.9 0.08 80)",  color: "oklch(0.4 0.1 80)", border: "oklch(0.75 0.1 80)" },
+              APPROVED:  { label: "Одобрено",        bg: "oklch(0.88 0.1 145)", color: "oklch(0.35 0.15 145)", border: "oklch(0.7 0.15 145)" },
+              REJECTED:  { label: "Отклонено",       bg: "oklch(0.9 0.06 27)",  color: "oklch(0.45 0.2 27)", border: "oklch(0.75 0.1 27)" },
+            };
+            const st = statusMap[s.status] ?? statusMap.PENDING;
             return (
               <Link
                 key={s.id}
                 href={`/curator/homework/${s.id}`}
                 className="flex items-center gap-4 px-4 py-3 text-sm transition-opacity hover:opacity-80"
-                style={{
-                  border: `2px solid ${isPending ? "var(--foreground)" : "var(--border)"}`,
-                  display: "flex",
-                }}
+                style={{ border: `2px solid ${st.border}`, display: "flex" }}
               >
                 <div className="flex-1 min-w-0">
                   <p className="font-medium truncate">{s.user.name}</p>
@@ -131,14 +136,10 @@ export default async function HomeworkListPage({ searchParams }: Props) {
                 </div>
                 <div className="text-right shrink-0">
                   <span
-                    className="text-xs px-2 py-0.5"
-                    style={{
-                      border: "1px solid var(--border)",
-                      background: isPending ? "var(--foreground)" : "transparent",
-                      color: isPending ? "var(--background)" : "var(--muted-foreground)",
-                    }}
+                    className="text-xs px-2 py-0.5 font-medium"
+                    style={{ background: st.bg, color: st.color }}
                   >
-                    {isPending ? "Новое" : "Проверено"}
+                    {st.label}
                   </span>
                   <p className="text-xs mt-1" style={{ color: "var(--muted-foreground)" }}>
                     {new Date(s.submittedAt).toLocaleDateString("ru-RU")}