建议：专注模式下增加对标题栏的隐藏

如图最上的标题栏隐藏掉，或者跟下面的会话标签合并？

Start by locating the focus-mode implementation and the code that renders the title bar and session tabs. Reproduce the layout shown in the attached image, then determine whether the title bar should be hidden or combined with the session tabs. Done means the chosen layout works consistently in focus mode without obscuring session controls.

Written by the indexing model from the issue text.