Header 컨텍스트 적용

frontend/src/commons/Header.tsx

 import React from "react";
 import { Link } from "react-router-dom";
+import { useAuth } from "../auth/auth.context";
 
-export const Header = () => (
+export const Header = () => {
+  const { user, logout } = useAuth();
+
+  return (
     <div className="bg-white border-b-2 border-b-themeColor px-2 sm:px-4 py-2.5">
       <div className="container flex flex-wrap justify-between items-center mx-auto">
         <Link to="/" className="font-bold text-2xl text-themeColor">
           Simple Survey Form
         </Link>
         <div className="md:flex items-center justify-end md:flex-1 lg:w-0">
+          {user.isLoggedIn ? (
+            <button onClick={() => logout()}>Logout</button>
+          ) : (
             <Link
               to="/login"
               className="whitespace-nowrap font-bold text-gray-600 hover:text-themeColor mx-1 py-2 px-3 rounded-md"
             >
               Login
             </Link>
+          )}
+
           <Link
             to="/signup"
             className="whitespace-nowrap font-bold text-white hover:bg-blue-500 mx-1 py-2 px-3 bg-themeColor rounded-md "
@@ -23,4 +32,5 @@ export const Header = () => (
         </div>
       </div>
     </div>
-);
+  );
+};