dsh-client-ui-timeline: DSH Web GUI Left-Edge Session Issue Navigation Bar

`dsh-client-ui-timeline` is a plugin located on the left edge of the DeepSeek Harness (DSH) Web GUI that provides conversation issue navigation. It supports highlighting, hover previews, smooth scrolling, and automatic loading of unrendered history. As of 2026-10-01, it is no longer maintained; the official client now includes equivalent functionality, and installation is not recommended.