dsh-user-message-timeline: Message Pill Rail in the Conversation Column

dsh-user-message-timeline is a DSH plugin maintained by huang-chunc, designed to improve the efficiency of locating messages in long conversation windows. It introduces a visualized pill funnel on the inner side of the conversation column, supporting interactions such as hover preview, drag scrub, paginated loading, and scroll browsing. With obsidian glass-effect bubbles, smooth animations, and light/dark theme support, it significantly optimizes the development and debugging experience. Installation requires DSH ≥0.1.7 and takes effect after a hard refresh.