Add 'approve without feedback' button for homework review

Curators/admins can mark a submission APPROVED (and complete the lesson)
without writing feedback. The student sees 'ДЗ принято ✓' and can no
longer resubmit. No email is sent on silent approval.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -3,7 +3,7 @@
 import { useState, useTransition, useRef } from "react";
 import { useRouter } from "next/navigation";
 import Link from "next/link";
-import { submitFeedback, setReviewing } from "./actions";
+import { submitFeedback, setReviewing, approveWithoutFeedback } from "./actions";
 import { AudioRecorder } from "@/components/curator/audio-recorder";
 
 interface FileItem {
@@ -69,6 +69,13 @@ export function FeedbackForm({
     });
   }
 
+  function handleApproveNoFeedback() {
+    startTransition(async () => {
+      await approveWithoutFeedback(submissionId);
+      router.push("/curator/homework");
+    });
+  }
+
   const isWorking = pending || uploading;
 
   return (
@@ -164,6 +171,17 @@ export function FeedbackForm({
           {pending ? "Отправка..." : "Отправить ответ"}
         </button>
 
+        <button
+          type="button"
+          onClick={handleApproveNoFeedback}
+          disabled={isWorking}
+          className="btn-aubade px-4 py-2 text-sm"
+          style={{ opacity: isWorking ? 0.5 : 1 }}
+          title="Засчитать ДЗ без письменного ответа"
+        >
+          Принять и отметить выполненным
+        </button>
+
         {currentStatus !== "REVIEWING" && (
           <button
             type="button"