fix(ai-demo): 修复不必要换行符显示在页面

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【预览链接】

• 完整版
• 基础
• 移动端
• 多实例
• 无工具栏
• 纯预览模式
• XSS 测试（默认禁用，需配置后允许）
• 图片编辑
• 表格编辑
• 自动编号标题
• 流式输入模式（AI chat 场景）
• VIM 编辑模式
• 使用自带或自定义的 Mermaid.js
• 自定义代码块外层容器