feat(api): implement new API routes for bulk category updates, inventory consumption, and product management with authentication

frontend/app/admin/products/ResetProductsButton.tsx

@@ -1,13 +1,14 @@
 'use client';
 
-import { useState, useTransition } from 'react';
-import { resetAllProducts } from './actions';
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
 
 export default function ResetProductsButton() {
-  const [isPending, startTransition] = useTransition();
+  const [isPending, setIsPending] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const router = useRouter();
 
-  function handleClick() {
+  async function handleClick() {
     if (
       !confirm(
         '⚠️ Detta raderar ALLA produkter, inventory, taggar, kvitto-alias och pantry.\n\nKategorier och användare behålls.\n\nÄr du säker?',
@@ -16,13 +17,19 @@ export default function ResetProductsButton() {
       return;
 
     setError(null);
-    startTransition(async () => {
-      try {
-        await resetAllProducts();
-      } catch (err) {
-        setError(err instanceof Error ? err.message : 'Okänt fel');
+    setIsPending(true);
+    try {
+      const res = await fetch('/api/admin/reset-products', { method: 'POST' });
+      if (!res.ok) {
+        const data = await res.json().catch(() => ({}));
+        throw new Error(data?.error || 'Återställning misslyckades');
       }
-    });
+      router.refresh();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Okänt fel');
+    } finally {
+      setIsPending(false);
+    }
   }
 
   return (