fix: 优化代码格式，合并类型声明

docs/src/demos/vben-descriptions/size/index.vue

@@ -9,7 +9,7 @@ const items = [
 ];
 </script>
 <template>
-  <div style="display: flex; flex-direction: column; gap: 16px">
+  <div class="flex gap-4 flex-col">
     <VbenDescriptions
       size="small"
       bordered

docs/src/demos/vben-descriptions/span/index.vue

@@ -1,7 +1,9 @@
 <script lang="ts" setup>
+import type { DescriptionsItemType } from '@vben/common-ui';
+
 import { VbenDescriptions } from '@vben/common-ui';
 
-const items = [
+const items: DescriptionsItemType[] = [
   { content: '1', label: 'A' },
   { content: '2（span: 2）', label: 'B', span: 2 },
   { content: '3', label: 'C' },

docs/src/demos/vben-descriptions/vertical/index.vue

@@ -1,7 +1,9 @@
 <script lang="ts" setup>
+import type { DescriptionsItemType } from '@vben/common-ui';
+
 import { VbenDescriptions } from '@vben/common-ui';
 
-const items = [
+const items: DescriptionsItemType[] = [
   { content: 'Vben', label: '用户名' },
   { content: '13800138000', label: '手机号' },
   { content: '中国 · 杭州', label: '居住地' },