feat(products): add reset functionality to delete all products and related data

frontend/app/admin/products/ResetProductsButton.tsx

@@ -0,0 +1,52 @@
+'use client';
+
+import { useState, useTransition } from 'react';
+import { resetAllProducts } from './actions';
+
+export default function ResetProductsButton() {
+  const [isPending, startTransition] = useTransition();
+  const [error, setError] = useState<string | null>(null);
+
+  function handleClick() {
+    if (
+      !confirm(
+        '⚠️ Detta raderar ALLA produkter, inventory, taggar, kvitto-alias och pantry.\n\nKategorier och användare behålls.\n\nÄr du säker?',
+      )
+    )
+      return;
+
+    setError(null);
+    startTransition(async () => {
+      try {
+        await resetAllProducts();
+      } catch (err) {
+        setError(err instanceof Error ? err.message : 'Okänt fel');
+      }
+    });
+  }
+
+  return (
+    <div style={{ marginBottom: '1.5rem' }}>
+      <button
+        type="button"
+        onClick={handleClick}
+        disabled={isPending}
+        style={{
+          padding: '0.6rem 1.25rem',
+          background: isPending ? '#ccc' : '#fff',
+          color: '#c00',
+          border: '1px solid #c00',
+          borderRadius: '4px',
+          cursor: isPending ? 'not-allowed' : 'pointer',
+          fontWeight: 600,
+          fontSize: '0.9rem',
+        }}
+      >
+        {isPending ? 'Återställer...' : '🗑 Återställ alla produkter'}
+      </button>
+      {error && (
+        <p style={{ color: 'crimson', marginTop: '0.5rem', fontSize: '0.9rem' }}>{error}</p>
+      )}
+    </div>
+  );
+}

frontend/app/admin/products/actions.ts

@@ -73,3 +73,18 @@ export async function deleteProduct(id: number) {
 
   revalidatePath('/admin/products');
 }
+
+export async function resetAllProducts() {
+  const res = await fetch(`${API_BASE}/api/products/reset-all`, {
+    method: 'DELETE',
+    headers: { ...(await getAuthHeaders()) },
+    cache: 'no-store',
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(`Kunde inte återställa produkter: ${text}`);
+  }
+
+  revalidatePath('/admin/products');
+}

frontend/app/admin/products/page.tsx

@@ -4,6 +4,7 @@ import MergePreviewForm from './MergePreviewForm';
 import AdminProductList from './AdminProductList';
 import Navigation from '../../Navigation';
 import ExpandableCreateProductSection from './ExpandableCreateProductSection';
+import ResetProductsButton from './ResetProductsButton';
 
 export default async function AdminProductsPage() {
   const products = await fetchJson<Product[]>('/api/products');
@@ -16,6 +17,8 @@ export default async function AdminProductsPage() {
 
       <ExpandableCreateProductSection />
 
+      <ResetProductsButton />
+
       <MergePreviewForm products={products} />
 
       <AdminProductList products={products} />