fixes and improvements

frontend/src/hooks/useUsers.ts

@@ -1,10 +1,11 @@
 import { useQuery } from "@tanstack/react-query";
 import { fetchUsers } from "../api/client";
+import type { UserDirectoryResponse } from "../types";
 
-export function useUsers() {
-	return useQuery({
-		queryKey: ["users"],
-		queryFn: fetchUsers,
+export function useUsers(machineId?: string) {
+	return useQuery<UserDirectoryResponse>({
+		queryKey: ["users", machineId ?? "default"],
+		queryFn: () => fetchUsers(machineId),
 		staleTime: 30_000,
 	});
 }