添加AI对话时隐藏头部的功能，主要是适配移动端

[Jiang-Wan]

添加了通过使用iframe引用chat页面时隐藏头部的功能，主要是应对多个iframe引用多个页面的情况，具体应用情况看下图吧：

我知道这功能挺傻的，但老板要加╮(╯▽╰)╭
我想，还是提个PR，看看会不会被合到主代码里，免得以后主代码升级了，我都必去拉源码来本地编译开发。
唉~，生活不易！

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