v0.4.0

Changelog

• 0fc31d6 Merge pull request #33 from Aejkatappaja/docs/readme-hero-image
• 5c0ef11 Merge pull request #34 from Aejkatappaja/feat/sse-ws-inspector
• daef8e9 Merge pull request #36 from Aejkatappaja/feat/headless-check
• 40951c5 Merge pull request #37 from Aejkatappaja/feat/visual-regression
• e370e9f Merge pull request #38 from Aejkatappaja/chore/release-v0.4.0
• 22236fb chore(release): prepare v0.4.0
• 353354c docs(readme): add a workbench hero image
• 50acd44 feat(ci): upload the Playwright HTML report for visual diffs
• 41d06c9 feat(ci): visual regression for every variant
• e081fe6 feat(cli): headless swapbook check for CI
• 7698a16 feat(ui): inspect SSE and WebSocket connections
• 4c8bad2 test(ci): dogfood swapbook check in the protocol smoke