Playwright POC - TestCafe to Playwright migration

[aleksei-semikozov]

Summary

POC for migrating TestCafe E2E tests to Playwright.

• 560 test files converted from TestCafe to Playwright
• Playwright config with CI-matching Chrome flags for deterministic rendering
• Playwright helper infrastructure (createWidget, testScreenshot, themeUtils)
• CI workflow for parallel Playwright test execution
• Scheduler/month tests verified working (15/15 pass locally)
• Regression detection verified (Playwright catches visual changes)

Key findings from POC:

• Screenshot dimensions identical between TestCafe/Playwright (1184×635)
• Pixel diff on same OS: 0% (deterministic with Chrome flags)
• Cross-platform diff (macOS vs Linux): 0.3-2.5% (font rendering only)
• maxDiffPixelRatio: 0.03 sufficient for cross-platform tolerance

What needs verification on CI:

1. Do Playwright screenshots match TestCafe baselines on self-hosted runner?
2. Stability over multiple runs (workflow supports repeat_count input)
3. Performance comparison vs TestCafe

Notes:

• Many converted files may have syntax errors (auto-converted, ~80% accuracy)
• Scheduler/common/month/ tests are fully working and verified
• Other components need manual fixes
• CI workflow may not trigger from feature branch (requires workflow on main)