feat: Add expandable section for creating products with integrated product form

frontend/app/inventory/page.tsx

@@ -1,5 +1,4 @@
 import InventoryForm from './InventoryForm';
-import ProductForm from './ProductForm';
 import Link from 'next/link';
 import { fetchJson } from '../../lib/api';
 import type { InventoryItem, Product } from '../../features/inventory/types';
@@ -109,7 +108,6 @@ export default async function InventoryPage({ searchParams }: InventoryPageProps
       <Navigation />
       <h1 style={{ marginBottom: '1.5rem' }}>Varor hemma</h1>
 
-      <ProductForm />
       <InventoryForm products={products} />
 
       <section style={{ marginBottom: '1.5rem' }}>