Add CI workflow for unit and integration tests

[DeDuckProject]

Summary

This PR introduces a GitHub Actions CI workflow to automatically run unit and integration tests on pull requests.

Key Changes

• Added .github/workflows/ci.yml with two separate jobs:
  • unit-tests: Runs unit tests on Node.js 20 using pnpm
  • integration-tests: Runs integration tests with Playwright, including:
    • Playwright Chromium browser installation
    • Example app server startup
    • Health check polling to ensure app readiness before running tests

Implementation Details

• Both jobs use Node.js 20 and pnpm for dependency management
• Integration tests include a robust health check mechanism that polls http://localhost:3000 up to 15 times with 1-second intervals
• The workflow triggers on pull request open and synchronize events
• Uses latest versions of standard GitHub Actions (checkout@v4, setup-node@v4, pnpm/action-setup@v4)

https://claude.ai/code/session_0161hwiY52dSwBergfZmniKA

[github-actions]

🎬 UI Demo Preview

Changes detected in: .github/workflows/ci.yml

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