fix key space cool time

src/App.jsx

@@ -49,6 +49,7 @@ export default function App() {
     setAnimState({ name, count: countRef.current });
   }, []);
 
+  const actionCoolRef = useRef(0);
   const doSkillRef = useRef(null);
 
   const handleKey = useCallback((e) => {
@@ -58,6 +59,9 @@ export default function App() {
     }
     if (e.code === 'Space') {
       e.preventDefault();
+      const now = Date.now();
+      if (now - actionCoolRef.current < 3000) return;
+      actionCoolRef.current = now;
       const idx = actionIndexRef.current;
       const anim = ACTION_SEQUENCE[idx % ACTION_SEQUENCE.length];
       playAnim(anim);