dsh-file-explorer-preview-code: Code Preview and Editing Plugin for DSH Web

The DSH Web plugin is designed to provide CodeMirror 6-based code editing for the file browser, replacing the default plain-text preview. It supports syntax highlighting for over 90 languages, line numbers, undo/redo, autosave, and status bar display, while following theme changes. Installation requires DSH core v0.9.0+ and the `dsh-file-explorer` plugin as a dependency. To use it, select "Code Editor" from the "Open with..." menu in the file list to start editing. Note that the plugin does not support Markdown, and large files may cause performance issues.