HTML Architect: Add end-to-end (E2E) tests

[DanilTkachenko (danilt2000)]

HTML Architect currently has no end-to-end test coverage. Following the discussion with Pavel and Jindra, the recommended approach is to introduce a modern E2E testing setup based on Playwright.

Why Playwright

Playwright is currently the best E2E framework, according to 2026 benchmark data
Sources for reference:

• https://contextqa.com/blog/what-is-playwright-vs-selenium-vs-cypress-2026/
• TestDino | Playwright Reporting and Analytics

Goal

Set up a Playwright-based E2E testing infrastructure for HTML Architect

Scope / acceptance criteria

• Playwright installed and configured in the HTML Architect project
• CI integration tests run on PRs

[DanilTkachenko (danilt2000)]

After discussion with Tomash we decided to to stick with Puppeteer to keep our testing infrastructure consistent and avoid adding more testing tools to the Infrastructure. However, if we hit major roadblocks with the Implementation or or critical testing functions will be missing, we’ll switch to Playwright