feat: handle redirects for admin in /order page and implement next query param on login

shop/app/order/page.tsx

@@ -31,19 +31,36 @@ async function OrderDataWrapper() {
   const { data: { user } } = await supabase.auth.getUser()
 
   if (!user) {
-    redirect('/auth/login')
+    redirect('/auth/login?next=/order')
   }
 
-  const products = await getProducts()
-  const categories = await getCategories()
-  const endCustomers = await getEndCustomers()
-
-  // Fetch profile if exists
-  const { data: profile } = await supabase
-    .from('profiles')
-    .select('*')
+  // Check user role
+  const { data: userData } = await supabase
+    .from('users')
+    .select('role')
     .eq('id', user.id)
     .single()
 
+  if (userData?.role === 'admin') {
+    redirect('/admin/einstellungen')
+  }
+
+  const products = await getProducts().catch(() => [])
+  const categories = await getCategories().catch(() => [])
+  const endCustomers = await getEndCustomers().catch(() => [])
+
+  // Fetch profile safely using maybeSingle
+  let profile = null
+  try {
+    const { data } = await supabase
+      .from('profiles')
+      .select('*')
+      .eq('id', user.id)
+      .maybeSingle()
+    profile = data
+  } catch (e) {
+    console.error('Fehler beim Laden des Profils:', e)
+  }
+
   return <OrderWizard products={products} categories={categories} initialProfile={profile} initialEndCustomers={endCustomers} />
 }