dsh-conversation-nav-dots: DSH Web Conversation Nav Dots

`dsh-conversation-nav-dots` is a client plugin for DSH Web designed to provide quick navigation in long conversation scenarios. The plugin adds minimal navigation dots along the right edge, supports message preview on hover and jump-to-message on click, and highlights the currently visible message. It natively supports dark theme, has zero runtime overhead, and delivers excellent performance, making it ideal for desktop-side long conversation scenarios.