feat : utm 타이머 추가

src/pages/utm/IntroPage.jsx

@@ -108,6 +108,8 @@ const INTRO_PHASE_DURATION = {
   done: 2000,
 };
 
+const TAB_DURATION = [5000, 7500, 7500, 5000]; // 실시간감시, 비행계획, 공역, 날씨
+
 const EVO_ITEMS = [
   {
     img: `${basePath}images/utm_intro_drone.png`,
@@ -482,6 +484,12 @@ function IntroPage() {
     };
   }, [activeIndex]);
 
+  useEffect(() => {
+    const t = setTimeout(() => {
+      setActiveIndex((prev) => (prev + 1) % UTM_WHAT_LEFT.length);
+    }, TAB_DURATION[activeIndex]);
+    return () => clearTimeout(t);
+  }, [activeIndex]);
   return (
     <article ref={ref}>
       <SubHero