createToggleButton() {
      const button = document.createElement("button");
      button.id = "model-dev-tools-toggle-button";
      button.textContent = "\u{1F6E0}";
      button.title = "Model DevTools";
      button.onclick = () => this.togglePanel();
      document.body.appendChild(button);
    }
Creates a toggle button for the Model DevTools panel.
The button is appended to the page and provides
functionality to show or hide the dev tools panel.