feat: implement visual regression testing v2.0 — Playwright pipeline with bbox extraction
- Add visual-test-pipeline.js: captures screenshots, extracts UI elements with bounding boxes, compares via pixelmatch, reports console/network errors
- Add capture-screenshots.js: baseline/current screenshot capture at mobile/tablet/desktop viewports
- Add console-error-monitor-standalone.js: standalone console/network error detection without MCP dependency
- Rewrite docker-compose.web-testing.yml: real Playwright image, working services, proper volume mounts
- Update package.json: v2.0.0, add playwright dependency, clean scripts
- Update README.md: accurate Docker-first docs with usage examples
- Add .gitignore: exclude node_modules, current/diff screenshots, reports
- Include baseline screenshots for bbox.wtf homepage
c6b15e0bcd