dsh-qnav lin-nanxing

DeepSeek Harness会话界面的快速查找跳转，根据会话中用户提问为单位进行跳转，适用于较长的上下文工作，需要快速找到对应的问题和回答的场景. A slim right-edge question-navigation rail for long DSH conversations. Every user question becomes a hoverable tick — click to jump straight to that turn, with current-position highlighting as you scroll. Pure client-side, no server needed, works on any DSH web instance.