fix architecture and write new tests

apps/admin/src/app/dashboard/renters/page.tsx

@@ -70,13 +70,11 @@ export default function AdminRentersPage() {
   const [error, setError] = useState<string | null>(null)
   const [actioning, setActioning] = useState<string | null>(null)
 
-  function getToken() { return localStorage.getItem('admin_token') ?? '' }
-
   async function fetchRenters() {
     try {
       const res = await fetch(`${ADMIN_API_BASE}/admin/renters`, {
-        headers: { Authorization: `Bearer ${getToken()}` },
         cache: 'no-store',
+        credentials: 'include',
       })
       const json = await res.json()
       if (!res.ok) throw new Error(json?.message ?? 'Failed')
@@ -105,7 +103,7 @@ export default function AdminRentersPage() {
       const endpoint = isBlocked ? 'unblock' : 'block'
       const res = await fetch(`${ADMIN_API_BASE}/admin/renters/${id}/${endpoint}`, {
         method: 'POST',
-        headers: { Authorization: `Bearer ${getToken()}` },
+        credentials: 'include',
       })
       if (!res.ok) throw new Error('Action failed')
       await fetchRenters()