Link homework review entry points to pending filter

Dashboard tiles and the curator CTA pointed to /curator/homework without
a status filter, so the default all-submissions list (newest first)
buried old PENDING items pages deep — 19 June submissions sat unseen
for 6 weeks while the top of the list showed freshly approved work.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/admin/dashboard/page.tsx

@@ -94,7 +94,7 @@ export default async function AdminDashboard() {
           value={homeworkPending}
           sub={`${homeworkTotal} всего сдано`}
           subAccent={homeworkPending > 0}
-          href="/curator/homework"
+          href="/curator/homework?status=pending"
         />
       </div>