dsh-code-nav: DSH Web Code Preview Navigation Plugin

dsh-code-nav is a plugin within the DeepSeek Harness ecosystem designed to enhance code preview as an extension of dsh-better-sidebar. It offers type-based syntax highlighting, symbol outline toggling, and in-file search, supports `n`/`m` key navigation, and automatically follows the theme. After installation, it becomes active when a code file is opened in the sidebar, significantly improving the code reading experience. Note that it supports read-only mode only, Vue/Svelte files highlight only script blocks, and complex code may result in parsing inaccuracies.