chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/slider/demo/index.vue

@@ -53,7 +53,7 @@
 <script lang="ts">
 import { reactive, toRefs } from 'vue';
 import { useTranslate } from '@demo/use-translate';
-import Toast from '../../toast';
+import { Toast } from '../../toast';
 
 const i18n = {
   'zh-CN': {

src/slider/test/index.spec.ts

@@ -1,4 +1,4 @@
-import Slider from '..';
+import { Slider } from '..';
 import {
   mount,
   trigger,