hover-preview 2

DeepSeek 官网风格消息时间线（增强版 fork）：悬停问答预览、面板钉住常驻、重点标记、平滑跳转。fork of dsh-chat-timeline.

Turn-rail settings for the DSH Web conversation locator: tick thickness, rail side, a curved length gradient anchored on the hovered tick, and a plain-text hover preview with adjustable line count, font size, and width.