fix：增加md样式文件

Yi.Ai.Vue3/src/pages/chat/layouts/chatWithId/index.vue

@@ -17,6 +17,7 @@ import { useChatStore } from '@/stores/modules/chat';
 import { useFilesStore } from '@/stores/modules/files';
 import { useModelStore } from '@/stores/modules/model';
 import { useUserStore } from '@/stores/modules/user';
+import '@/styles/github-markdown.css';
 
 type MessageItem = BubbleProps & {
   key: number;
@@ -284,7 +285,7 @@ function markdownContent(item: any) {
         </template>
         <!-- 自定义气泡内容 -->
         <template #content="{ item }">
-          <XMarkdown :markdown="markdownContent(item)" />
+          <XMarkdown class="markdown-body" :markdown="markdownContent(item)" />
         </template>
       </BubbleList>