GitHub Copilot app puts the diff, terminal, and browser side by side

The GitHub Copilot app places the diff, terminal, and browser side by side. Reviewers can check, run, and preview agent code in one view instead of switching tabs.

GitHub’s beginner guide, [Using the diff, terminal, and browser](https://github.blog/ai-and-ml/github-copilot/github-copilot-app-for-beginners-using-the-diff-terminal-and-browser/?utm_source=x-using-the-diff-beginners&utm_medium=social&utm_campaign=github-app-cli-Q1-push), covers this layout in the Copilot app.