Cache Playwright browsers in CI

[nitrobass24]

Summary

• Cache Playwright browser binaries (~150 MB) between CI runs using actions/cache
• Cache npm deps via setup-node cache option
• Use npm ci instead of npm install for deterministic installs
• On cache hit, skip browser download and only install system deps (apt packages)
• Cache key includes package-lock.json hash so it invalidates on Playwright version bumps

Test plan

• First run: cache miss, full install (same speed as before)
• Second run: cache hit, skips browser download (faster)
• E2E tests still pass

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 23e07081-0cef-4615-a356-85376188742b

📥 Commits

Reviewing files that changed from the base of the PR and between 55d77c6 and 6665337.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/cache-playwright

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