dsh-strata: Transforming DSH Web Session Scrollbar into Session Map

`dsh-strata` is an open-source session navigation plugin developed specifically for the DeepSeek Harness Web GUI, designed to address the challenge of quickly locating key content within lengthy sessions. This plugin replaces the traditional scrollbar with an interactive, proportionally scaled, color-coded session map. By using colors to distinguish user messages, failed tool calls, and regular content, and providing clickable anchors in the sidebar, it allows users to intuitively view the session structure and jump directly to specific positions with a single click. The plugin is implemented entirely on the browser side, without transmitting any data over the network, ensuring privacy and security. It supports three map scale modes—near, medium, and full—and includes comprehensive keyboard navigation features (such as arrow keys, Page Up/Down, etc.), while also complying with accessibility standards. Additionally, users can hover over messages to preview their content or pin the sidebar for expanded, detailed information. Installation is straightforward.