docs: note Chromium installation before browser verification

[wufangyong973]

#522

Both example READMEs offer a browser verification step, but neither said Playwright needs Chromium installed first — CI already does this before running the checks. Added the suggested one-line setup note immediately before the browser verification command block in examples/drawing-game/README.md and examples/shared-worker-lobby/README.md. The Node-only comparison path is left untouched, as the issue notes it does not need Chromium.

Docs-only change.

Closes #522.

[vercel]

@wufangyong973 is attempting to deploy a commit to the electrohyun's projects Team on Vercel.

A member of the Team first needs to authorize it.

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[electrohyun]

Thank you for the contribution! The changes address the issue as intended.

But, I'd like to keep the remaining good first issues available for other new contributors, so I'll close this PR. I'm happy to merge #534 once you've addressed the review feedback and the required checks pass.