- _load_workspace_pages now recursively loads children via _load_children()
- Sidebar: recursive Jinja2 macro render_workspace_tree()
- Drag & drop: HTML5 DnD — drag files into folders or reorder
- move API: PUT /api/local-workspace/items/{id}/move
- Folder hover shows 📄 (new file) + 📁 (sub-folder) buttons
- newPageInFolder/newFolderInFolder with parent_id for nesting
- Visual: dragging opacity + drop target highlight
- Items indented by depth (16px per level)