refactor(client): Use symbol

src/client/pages/preview.vue

@@ -8,6 +8,7 @@
 import { defineComponent } from 'vue';
 import { faEye } from '@fortawesome/free-solid-svg-icons';
 import MkSample from '@client/components/sample.vue';
+import * as symbols from '@client/symbols';
 
 export default defineComponent({
 	components: {
@@ -16,7 +17,7 @@ export default defineComponent({
 
 	data() {
 		return {
-			INFO: {
+			[symbols.PAGE_INFO]: {
 				title: this.$ts.preview,
 				icon: faEye,
 			},