Playwright preview autoupdate CI

[TomMaSS]

Summary

Add CI step that runs Playwright to capture UI screenshots on PRs and auto-updates the preview images. Include agents.md instructions for which sections to observe.

Technical Approach

• GitHub Actions workflow triggered on PR
• Run Playwright to capture key pages (dashboard, section view, graph, chat)
• Upload screenshots as PR comment or commit to branch
• agents.md section documenting which UI areas to screenshot
• Compare with baseline screenshots for visual regression detection

Key Files

• .github/workflows/ — new or existing CI workflow
• ui/playwright.config.ts — Playwright setup
• AGENTS.md — add screenshot section instructions

Acceptance Criteria

• CI captures screenshots on PR
• Screenshots posted as PR comment
• agents.md documents observable sections
• Baseline comparison for regression detection