chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/pull-refresh/PullRefresh.tsx

@@ -8,7 +8,7 @@ import { useScrollParent } from '@vant/use';
 import { useTouch } from '../composables/use-touch';
 
 // Components
-import Loading from '../loading';
+import { Loading } from '../loading';
 
 const [name, bem, t] = createNamespace('pull-refresh');
 

src/pull-refresh/demo/index.vue

@@ -44,7 +44,7 @@
 <script lang="ts">
 import { computed, onMounted, reactive, toRefs } from 'vue';
 import { useTranslate } from '@demo/use-translate';
-import Toast from '../../toast';
+import { Toast } from '../../toast';
 
 const i18n = {
   'zh-CN': {

src/pull-refresh/test/index.spec.ts

@@ -1,4 +1,4 @@
-import PullRefresh from '..';
+import { PullRefresh } from '..';
 import {
   mount,
   later,