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

frontend/app/admin/products/AdminProductList.tsx

@@ -1,7 +1,6 @@
 'use client';
 
-import { useState, useMemo, useEffect, useTransition } from 'react';
+import { useState, useMemo, useEffect, useTransition, useCallback } from 'react';
-import { useRouter } from 'next/navigation';
 import type { Product, Category } from '../../../features/inventory/types';
 import EditProductForm from './EditProductForm';
 import { bulkSetCategory, suggestBulkCategories } from './actions';
@@ -20,10 +19,6 @@ type AiSuggestion = {
   };
 };
 
-type Props = {
-  products: Product[];
-};
-
 const sortOptions = [
   { value: 'createdDesc', label: 'Senast tillagda' },
   { value: 'nameAsc', label: 'Namn A–Ö' },
@@ -39,8 +34,9 @@ function flattenTree(nodes: CategoryNode[], depth = 0): { id: number; label: str
   return result;
 }
 
-export default function AdminProductList({ products }: Props) {
+export default function AdminProductList() {
-  const router = useRouter();
+  const [products, setProducts] = useState<Product[]>([]);
+  const [productsLoading, setProductsLoading] = useState(true);
   const [search, setSearch] = useState('');
   const [sort, setSort] = useState('createdDesc');
   const [showUncategorizedOnly, setShowUncategorizedOnly] = useState(false);
@@ -57,6 +53,18 @@ export default function AdminProductList({ products }: Props) {
   const [aiApproved, setAiApproved] = useState<Set<number>>(new Set());
   const [aiApplying, setAiApplying] = useState(false);
 
+  const refetchProducts = useCallback(() => {
+    fetch('/api/products')
+      .then((r) => r.json())
+      .then((data) => { if (Array.isArray(data)) setProducts(data); })
+      .catch(() => {})
+      .finally(() => setProductsLoading(false));
+  }, []);
+
+  useEffect(() => {
+    refetchProducts();
+  }, [refetchProducts]);
+
   useEffect(() => {
     fetch('/api/categories')
       .then((r) => r.json())
@@ -129,7 +137,7 @@ export default function AdminProductList({ products }: Props) {
         await bulkSetCategory(ids, categoryId);
         setSelectedIds(new Set());
         setBulkCategoryId('');
-        router.refresh();
+        refetchProducts();
       } catch (err) {
         setBulkError(err instanceof Error ? err.message : 'Fel vid uppdatering');
       }
@@ -167,6 +175,7 @@ export default function AdminProductList({ products }: Props) {
       }
       setAiSuggestions(null);
       setAiApproved(new Set());
+      refetchProducts();
     } catch (err) {
       setAiError(err instanceof Error ? err.message : 'Fel vid tillämpning');
     } finally {
@@ -174,6 +183,10 @@ export default function AdminProductList({ products }: Props) {
     }
   };
 
+  if (productsLoading) {
+    return <p style={{ color: '#888', marginTop: '1rem' }}>Laddar produkter…</p>;
+  }
+
   return (
     <>
       {/* Sök + sortering + filter */}
@@ -337,7 +350,11 @@ export default function AdminProductList({ products }: Props) {
             <div style={{ fontSize: '0.8rem', color: '#888' }}>
               Normalized: {product.normalizedName}
             </div>
-            <EditProductForm product={product} />
+            <EditProductForm
+              product={product}
+              onSaved={(updated) => setProducts((prev) => prev.map((p) => p.id === updated.id ? updated : p))}
+              onDeleted={(id) => setProducts((prev) => prev.filter((p) => p.id !== id))}
+            />
           </article>
         ))}
       </div>

frontend/app/admin/products/EditProductForm.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { useState, useTransition, useEffect } from 'react';
-import { useRouter } from 'next/navigation';
 import type { Product } from '../../../features/inventory/types';
 import { updateProductWithTags, deleteProduct, suggestProductCategory } from './actions';
 
@@ -22,6 +21,8 @@ type AiSuggestion = {
 
 type Props = {
   product: Product;
+  onSaved: (updated: Product) => void;
+  onDeleted: (id: number) => void;
 };
 
 const inputStyle: React.CSSProperties = {
@@ -33,8 +34,7 @@ const inputStyle: React.CSSProperties = {
   boxSizing: 'border-box',
 };
 
-export default function EditProductForm({ product }: Props) {
+export default function EditProductForm({ product, onSaved, onDeleted }: Props) {
-  const router = useRouter();
   const [isOpen, setIsOpen] = useState(false);
   const [isPending, startTransition] = useTransition();
   const [error, setError] = useState<string | null>(null);
@@ -106,10 +106,10 @@ export default function EditProductForm({ product }: Props) {
     const rawTags = tagInput.split(',').map((t) => t.trim().toLowerCase()).filter(Boolean);
     startTransition(async () => {
       try {
-        await updateProductWithTags(formData, rawTags);
+        const updated = await updateProductWithTags(formData, rawTags);
         setSuccess(true);
         setIsOpen(false);
-        router.refresh();
+        onSaved(updated as Product);
       } catch (err) {
         setError(err instanceof Error ? err.message : 'Okänt fel');
       }
@@ -123,7 +123,7 @@ export default function EditProductForm({ product }: Props) {
     startTransition(async () => {
       try {
         await deleteProduct(product.id);
-        router.refresh();
+        onDeleted(product.id);
       } catch (err) {
         setError(err instanceof Error ? err.message : 'Okänt fel');
       }

frontend/app/admin/products/MergePreviewForm.tsx

@@ -1,14 +1,11 @@
 'use client';
 
-import { useState, useTransition } from 'react';
+import { useState, useTransition, useEffect } from 'react';
 import type { MergePreview, Product } from '../../../features/inventory/types';
 import { mergeProducts } from '../../inventory/actions';
 
-type Props = {
+export default function MergePreviewForm() {
-  products: Product[];
+  const [products, setProducts] = useState<Product[]>([]);
-};
-
-export default function MergePreviewForm({ products }: Props) {
   const [sourceProductId, setSourceProductId] = useState('');
   const [targetProductId, setTargetProductId] = useState('');
   const [preview, setPreview] = useState<MergePreview | null>(null);
@@ -18,6 +15,15 @@ export default function MergePreviewForm({ products }: Props) {
   const [isConfirming, setIsConfirming] = useState(false);
   const [isExpanded, setIsExpanded] = useState(false);
 
+  useEffect(() => {
+    if (isExpanded && products.length === 0) {
+      fetch('/api/products')
+        .then((r) => r.json())
+        .then((data) => { if (Array.isArray(data)) setProducts(data); })
+        .catch(() => {});
+    }
+  }, [isExpanded]);
+
   const fetchPreview = () => {
     setError(null);
     setSuccessMessage(null);

frontend/app/admin/products/actions.ts

@@ -97,6 +97,8 @@ export async function updateProductWithTags(formData: FormData, tags: string[])
     throw new Error(`Kunde inte uppdatera produkt: ${text}`);
   }
 
+  const updatedProduct = await res.json();
+
   const tagsRes = await fetch(`${API_BASE}/api/products/${id}/tags`, {
     method: 'PUT',
     headers: { 'Content-Type': 'application/json', ...authHeaders },
@@ -108,6 +110,14 @@ export async function updateProductWithTags(formData: FormData, tags: string[])
     const text = await tagsRes.text();
     throw new Error(`Kunde inte uppdatera taggar: ${text}`);
   }
+
+  // Fetch the complete product (includes tags, categoryRef) after both updates
+  const fullRes = await fetch(`${API_BASE}/api/products/${id}`, {
+    headers: authHeaders,
+    cache: 'no-store',
+  });
+  if (!fullRes.ok) return updatedProduct;
+  return fullRes.json();
 }
 
 export async function deleteProduct(id: number) {

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>
   );
 }