dsh-code-ui: A Cursor-Style AI Code Editor Workbench Plugin

`dsh-code-ui` is a client plugin for DeepSeek Harness (DSH), designed to provide developers with a workbench for viewing code and conversing with AI simultaneously. The plugin integrates a file tree, multiple tabs, syntax highlighting, and inline reference/translation features, and supports both a right-side docked mode and a floating window mode. Users can select code to reference, translate, or annotate it, which the AI will read once sent. The plugin is hidden by default and must be invoked via a top button; all data will be cleared after a restart.