DSH Message Navigator

Key features

• Message Navigator - a vertical message index to the right of DeepSeek Harness web chat interface: Each user enters a semi-transparent short line marker, clicks on a smooth jump, current reading position is high in real time while rolling.
• Scroll Sync Port 40% reading lines, with real-time highlight to marker; scroll path pure arithmetic calculation, zero DOM query, zero re-render
• Hover Preview Unified 240px card tooltip, 1-2 lines omitted
• Dynamic HotSync New Message/Delete/ Loading History/ Switch Session Autorebuild; AI current output does not generate marker