feat(products): update event handling for product list refresh on creation and reset actions

frontend/app/admin/products/AdminProductList.tsx

@@ -72,7 +72,11 @@ export default function AdminProductList() {
   useEffect(() => {
     const handler = () => refetchProducts();
     window.addEventListener('product-created', handler);
-    return () => window.removeEventListener('product-created', handler);
+    window.addEventListener('product-list-changed', handler);
+    return () => {
+      window.removeEventListener('product-created', handler);
+      window.removeEventListener('product-list-changed', handler);
+    };
   }, [refetchProducts]);
 
   useEffect(() => {

frontend/app/admin/products/MergePreviewForm.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { useState, useTransition, useEffect } from 'react';
-import { useRouter } from 'next/navigation';
 import type { MergePreview, Product } from '../../../features/inventory/types';
 
 export default function MergePreviewForm() {
@@ -14,7 +13,6 @@ export default function MergePreviewForm() {
   const [isPending, startTransition] = useTransition();
   const [isConfirming, setIsConfirming] = useState(false);
   const [isExpanded, setIsExpanded] = useState(false);
-  const router = useRouter();
 
   useEffect(() => {
     if (isExpanded && products.length === 0) {
@@ -96,7 +94,7 @@ export default function MergePreviewForm() {
         setIsConfirming(false);
         setSourceProductId('');
         setTargetProductId('');
-        router.refresh();
+        window.dispatchEvent(new CustomEvent('product-list-changed'));
       } catch (err) {
         setError(err instanceof Error ? err.message : 'Okänt fel');
       }

frontend/app/admin/products/ResetProductsButton.tsx

@@ -1,12 +1,10 @@
 'use client';
 
 import { useState } from 'react';
-import { useRouter } from 'next/navigation';
 
 export default function ResetProductsButton() {
   const [isPending, setIsPending] = useState(false);
   const [error, setError] = useState<string | null>(null);
-  const router = useRouter();
 
   async function handleClick() {
     if (
@@ -24,7 +22,7 @@ export default function ResetProductsButton() {
         const data = await res.json().catch(() => ({}));
         throw new Error(data?.error || 'Återställning misslyckades');
       }
-      router.refresh();
+      window.dispatchEvent(new CustomEvent('product-list-changed'));
     } catch (err) {
       setError(err instanceof Error ? err.message : 'Okänt fel');
     } finally {

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

@@ -1,7 +1,6 @@
 'use client';
 
 import { useState, useTransition } from 'react';
-import { useRouter } from 'next/navigation';
 
 type PendingProduct = {
   id: number;
@@ -17,7 +16,6 @@ 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);
@@ -34,7 +32,6 @@ export default function PendingProductsClient({ products: initial }: { products:
           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 {