fix: initIntroAnimation을 DOM ready 이후 실행

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/js/main.js

@@ -5,9 +5,8 @@ import { initIntroAnimation } from "./introAnimation.js";
 
 gsap.registerPlugin(ScrollTrigger);
 
-initIntroAnimation();
-
 $(function () {
+  initIntroAnimation();
   const $gnb = $("#gnb");
   const $hamburger = $(".gnb__hamburger");
   const $mobileNav = $(".gnb__mobileNav");