feat(admin): refactor product management components for improved state handling and data fetching

frontend/app/admin/products/page.tsx

@@ -1,5 +1,3 @@
-import { fetchJson } from '../../../lib/api';
-import type { Product } from '../../../features/inventory/types';
 import MergePreviewForm from './MergePreviewForm';
 import AdminProductList from './AdminProductList';
 import Navigation from '../../Navigation';
@@ -7,8 +5,6 @@ import ExpandableCreateProductSection from './ExpandableCreateProductSection';
 import ResetProductsButton from './ResetProductsButton';
 
 export default async function AdminProductsPage() {
-  const products = await fetchJson<Product[]>('/api/products');
-
   return (
     <main style={{ padding: '1rem', maxWidth: '1100px', margin: '0 auto' }}>
       <Navigation />
@@ -19,9 +15,9 @@ export default async function AdminProductsPage() {
 
       <ResetProductsButton />
 
-      <MergePreviewForm products={products} />
+      <MergePreviewForm />
 
-      <AdminProductList products={products} />
+      <AdminProductList />
     </main>
   );
 }