DeepSeek Harness Plugin: Conversation Turn Navigation Panel

`@xiaoso/dsh-turn-navigator` is a plugin designed for the DeepSeek Harness (DSH) web interface to solve the inefficiency of manual scrolling in long conversations. It provides a visual turn navigation panel with quick jump support and real-time status display. Install it with `dsh plugin add @xiaoso/dsh-turn-navigator`. It is compatible with dsh v0.1.0-rc.5; when installing via git, be aware of pnpm version restrictions and build script issues.