dsh-workspace-drag: Drag to Organize Conversations in the Sidebar

`dsh-workspace-drag` is a DeepSeek Harness (DSH) plugin designed to simplify the process of migrating conversation workspaces. Users can directly drag a conversation row into the target workspace to organize it, without an intermediate popup. The plugin provides a settings-page toggle, protection for active conversations, and an atomic migration mechanism to ensure data integrity. Installation must be performed via the official command or a local bundling script, and requires DSH version 0.1.5 or higher and a Node.js 18 environment.