fix: add transition duration to customizer button animation

- Add transition duration of 0.2s to motion.div for smoother animation
- Improves visual consistency when opening/closing icon customizer

web/src/components/icon-details.tsx

@@ -839,6 +839,7 @@ export function IconDetails({
 													key="button"
 													initial={{ opacity: 0 }}
 													animate={{ opacity: 1 }}
+													transition={{ duration: 0.2 }}
 													exit={{ opacity: 0 }}
 													className="relative"
 												>