Add integration/unit tests (Playwright+Jest vs Cypress)

[heyitsOK]

Potentially investigate screenshot comparison feature, etc

[hellomusa]

While investigating snapshot testing, I discovered Jest doesn't support async server components (which all our pages are) 😢
https://nextjs.org/docs/app/building-your-application/testing/jest

[heyitsOK]

@hellomusa can we look into E2E testing since that seems to be the supported testing method for Next.js async server components?