dsh-math-render: Rendering LaTeX Formulas on the DeepSeek Harness Web Interface

`dsh-math-render` is a client-side plugin for DeepSeek Harness (DSH), designed to address the rendering of mathematical formulas in the web interface. It supports rendering LaTeX formulas (such as `$...$` and `$$...$$`) in message bubbles and provides a live preview above the input box. After installation, restart Harness and refresh the page for the changes to take effect. The plugin overrides user bubble rendering and supports error fallback, but it has limitations in customizing bubble styles and integrating with inline editors. It requires DSH version >= 0.1.5-rc.1.