fix: non-case sensitive filtering

Author: PMolnes

src/guide/built-ins/transition-demos/ListStagger.vue

@@ -13,7 +13,7 @@ const list = [
 const query = ref('')
 
 const computedList = computed(() => {
-  return list.filter((item) => item.msg.toLowerCase().includes(query.value))
+  return list.filter((item) => item.msg.toLowerCase().includes(query.value.toLowerCase()))
 })
 
 function onBeforeEnter(el) {