xstate playground Run with npx playwright test. references https://dev.to/ryanroselloog/model-based-testing-using-playwright-and-xstate-what-ive-learnt-so-far-4180 https://stately.ai/viz https://gist.github.com/ryanrosello-og/671aab64b3c0765d545c0d71813bafdc https://stately.ai/docs/testing https://graph-docs.vercel.app/model-based-testing/playwright https://stately.ai/docs/migration