dsh-lens-rail: DeepSeek Harness Left-Side Message Navigation Rail

`hzpeng57/dsh-lens-rail` provides a Codex-style left-side navigation rail for long conversations in the DeepSeek Harness (DSH) web interface. The tool visually presents the message flow with a vertical line and supports hover focus, scroll-triggered highlighting, and click-to-jump, effectively addressing the low efficiency of locating historical messages. Installation requires a command-line plugin command and restarting the process.