Epic/error 화면 구현 (#65)

* 🎨 style : Error 페이지 구현

* ✨ feat : 버튼 클릭 시 토스트 알림 추가

Author: LMS10

src/pages/Error/index.jsx

@@ -1,3 +1,41 @@
-const Error = () => <h1>에러 페이지입니다.</h1>;
+import { useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import imgLogo from 'assets/images/img_Logo.svg';
+
+const Error = () => {
+  const [showToast, setShowToast] = useState(false);
+  const navigate = useNavigate();
+
+  const handleButtonClick = () => {
+    setShowToast(true);
+
+    setTimeout(() => {
+      navigate('/');
+    }, 3000);
+  };
+
+  return (
+    <div className='relative flex flex-col items-center min-h-screen bg-gray-20'>
+      <img src={imgLogo} alt='오픈마인드 로고' className='absolute w-[248px] h-[98px] mt-[80px] mx-auto mb-[24px] md:w-[456px] md:h-[180px] md:mt-[160px] opacity-30' />
+      <div className='relative flex flex-col items-center max-w-[340px] mx-[20px] mt-[290px] p-[40px] rounded-lg bg-white shadow-lg z-10 md:w-[450px] md:mt-[360px]'>
+        <p className='text-brown-50 text-4xl font-bold font-actor'>404</p>
+        <p className='mt-[5px] mb-[20px] text-brown-40 text-lg'>페이지를 찾을 수 없어요</p>
+        <button
+          type='button'
+          onClick={handleButtonClick}
+          className='flex items-center justify-center w-[127px] h-[34px] px-3 py-2 rounded-md bg-brown-40 text-gray-10 text-sm md:w-[166px] md:h-[46px] md:gap-[8px] md:text-base transition-colors duration-300 hover:bg-brown-50'
+        >
+          처음으로 돌아가기
+        </button>
+      </div>
+
+      {showToast && (
+        <div className='fixed bottom-[100px] md:bottom-[60px] left-1/2 px-5 py-3 bg-black rounded-lg text-sm/[18px] font-medium text-white -translate-x-1/2 shadow-2pt animate-slide-up-fade-delete'>
+          홈으로 이동합니다.
+        </div>
+      )}
+    </div>
+  );
+};
 
 export default Error;