evtools"></div>
  </div>

  <!-- This script installs the hook, injects the backend, and renders the DevTools UI -->
  <!-- In DEV mode, this file is served by the Webpack dev server -->
  <!-- For production builds, it's built by Webpack and uploaded from the local file system -->
  <script src="dist/app-devtools.js"></script>
  <script type="module">
    let layoutType = 'leftright';
    let splitRatio = 0.5;
    let isDragging = false;

    // handle layout changes
    const layout = document.getElementB