folder-tree-sh: Workspace File Tree Plugin for DSH Web GUI

folder-tree-sh (dsh-ftree) is a workspace file tree plugin for DSH Web GUI (v0.3.0, MIT) offering hot-swappable integration with zero core modifications. Core features include: a file tree sidebar (expand/collapse, 5-second auto-refresh, real-time filtering, multi-field sorting, toggle for hidden files, draggable width, and state persistence); multi-tab preview supporting Markdown (rendering + editing, auto-save, Ctrl+S), 30+ language syntax highlighting, CSV table rendering (automatic delimiter detection), image zooming, native PDF rendering, and true DOCX rendering (relies on mammoth, falling back to PowerShell extraction if unavailable); and chunked loading for large text (1MB per chunk, 100MB limit, GBK auto-detection). It also features Markdown inline editing (800ms debounce auto-save, Ctrl+)