first commit

frontend/src/hooks/useAuth.ts

@@ -0,0 +1,22 @@
+import { useMutation } from '@tanstack/react-query';
+import * as authApi from '../api/auth';
+import { useAuthStore } from '../stores/authStore';
+
+export function useLogin() {
+  const storeLogin = useAuthStore((s) => s.login);
+
+  return useMutation({
+    mutationFn: ({ username, password }: { username: string; password: string }) =>
+      authApi.login(username, password),
+    onSuccess: (data) => {
+      storeLogin(data.access_token);
+    },
+  });
+}
+
+export function useRegister() {
+  return useMutation({
+    mutationFn: ({ username, password }: { username: string; password: string }) =>
+      authApi.register(username, password),
+  });
+}