⚡️(frontend) dont endlessly query user info

we query user at load and keep info for a while, way less than user
session anyway. will need to check if we could get de-sync (like loading
the frontend with backend user session ending in 30 minutes while we
don't check user state until an hour)

src/frontend/src/features/auth/api/useUser.tsx

@@ -12,6 +12,7 @@ export const useUser = () => {
   const query = useQuery({
     queryKey: [keys.user],
     queryFn: fetchUser,
+    staleTime: 1000 * 60 * 60, // 1 hour
   })
 
   const isLoggedIn =