feat: 공용 UI 및 유틸 함수 추가

Author: rmkim7

apps/web/shared/lib/format-date.ts

@@ -0,0 +1,4 @@
+export function formatToLocaleDate(dateString: string): string {
+  const date = new Date(dateString);
+  return date.toLocaleString('ko-KR');
+}

apps/web/shared/ui/button.tsx

@@ -0,0 +1,27 @@
+'use client';
+
+import { MouseEventHandler } from 'react';
+
+interface ButtonProps {
+  divClassName?: string;
+  buttonClassName?: string;
+  onClick?: MouseEventHandler<HTMLButtonElement>;
+  children: React.ReactNode;
+}
+
+const Button = ({
+  divClassName = '',
+  buttonClassName = '',
+  onClick,
+  children,
+}: ButtonProps) => {
+  return (
+    <div className={divClassName}>
+      <button onClick={onClick} className={buttonClassName}>
+        {children}
+      </button>
+    </div>
+  );
+};
+
+export { Button };