add supabase authentication

src/app/admin/campaigns/[id]/participants/page.tsx

@@ -13,11 +13,12 @@ import { Badge } from '@/components/ui/badge';
 import { Avatar, AvatarFallback } from '@/components/ui/avatar';
 import { Input } from '@/components/ui/input';
 import Navigation from '@/components/Navigation';
+import AuthGuard from '@/components/AuthGuard';
 import { Users, User, Calendar, Mail, Vote, Copy, Check } from 'lucide-react';
 
 export const dynamic = 'force-dynamic';
 
-export default function CampaignParticipantsPage() {
+function CampaignParticipantsPageContent() {
   const params = useParams();
   const campaignId = params.id as string;
   const [campaign, setCampaign] = useState<Campaign | null>(null);
@@ -369,3 +370,11 @@ export default function CampaignParticipantsPage() {
     </div>
   );
 }
+
+export default function CampaignParticipantsPage() {
+  return (
+    <AuthGuard>
+      <CampaignParticipantsPageContent />
+    </AuthGuard>
+  );
+}