feat(api): add PATCH endpoint for updating product status with authentication

frontend/app/admin/products/pending/PendingProductsClient.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState, useTransition } from 'react';
-import { setProductStatus } from '../actions';
+import { useRouter } from 'next/navigation';
 
 type PendingProduct = {
   id: number;
@@ -17,14 +17,24 @@ export default function PendingProductsClient({ products: initial }: { products:
   const [isPending, startTransition] = useTransition();
   const [error, setError] = useState<string | null>(null);
   const [processing, setProcessing] = useState<number | null>(null);
+  const router = useRouter();
 
   function handleAction(id: number, status: 'active' | 'rejected') {
     setError(null);
     setProcessing(id);
     startTransition(async () => {
       try {
-        await setProductStatus(id, status);
+        const res = await fetch(`/api/admin/product-status/${id}`, {
+          method: 'PATCH',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ status }),
+        });
+        if (!res.ok) {
+          const data = await res.json().catch(() => ({}));
+          throw new Error(data?.error || 'Fel vid uppdatering');
+        }
         setProducts((prev) => prev.filter((p) => p.id !== id));
+        router.refresh();
       } catch (err) {
         setError(err instanceof Error ? err.message : 'Fel vid uppdatering');
       } finally {