dsh-session-timeline: Adding a Navigable Timeline to the Left of DSH Web Sessions

dsh-session-timeline is a DSH web session timeline plugin developed by XiLuovo, designed to address the pain points of quickly locating, jumping to, and previewing user input positions in long conversations. The plugin renders a horizontal short-line timeline on the left side of the conversation area, where each line corresponds to a user message, supporting internal scrolling without scrollbars. Core features include: full statistics and persistent caching based on sessionProjections; Scroll-spy for the active line to follow the current viewport; wave focus effects on mouse movement; hover-displayed rounded preview tooltips containing user questions and AI replies; clicking any line to jump to the corresponding conversation, with automatic history loading if the target is outside the window; and a top capsule handle for collapsing and expanding the timeline. The plugin is licensed under MIT and implemented in pure JS.