docs: add Chromium installation to example verification instructions

[Revan0809]

Summary

Both examples/drawing-game and examples/shared-worker-lobby offer browser verification (pnpm example:drawing-game:verify / pnpm example:shared-worker), but neither README mentioned that Playwright needs Chromium installed first. CI already installs it (.github/workflows/ci.yml runs pnpm exec playwright install --with-deps chromium) before running these checks, so a first-time local run of the verify commands fails without this.

• Added a setup note before each browser verification command: "Before your first browser verification, install Chromium by running pnpm exec playwright install chromium from the repository root."
• Kept the note with the browser checks only — the Node comparison commands (pnpm example:drawing-game:test) don't need Chromium, so they're left alone.

Fixes #522

Test plan

• pnpm format — 0 changes to the two edited files (formatting already correct)
• Verified the note sits immediately before each browser-based verify command in both READMEs

🤖 Generated with Claude Code

[vercel]

@Revan0809 is attempting to deploy a commit to the electrohyun's projects Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Repository: electrohyun/smocket/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: fc7d9009-2e20-47e6-978b-ab8c9fe37602

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

Autopilot is currently an internal CodeRabbit preview.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
smocket	Ready	Preview	Oct 1, 2026 1:00pm UTC

[electrohyun]

Thank you for the contribution!