dsh-topbar-manager: DeepSeek Harness Top Bar Button Manager

`dsh-topbar-manager` is a web plugin maintained by baihejiangnan, designed to address the cluttered top toolbar buttons in the plugin-based architecture of DeepSeek Harness (DSH). It provides show/hide controls and supports persisting configurations. Core features include inspecting top bar buttons, identifying source plugins, providing toggle controls, and ignoring native buttons. Users can view and manage buttons such as Diff, Conversation Management, and Undo in settings. By streamlining the interface, the plugin helps developers improve operational efficiency.