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Add Playwright E2E + visual regression test infrastructure (#13314)

* Add Playwright E2E + visual regression test infrastructure

- Upgrade playwright.config.ts with baseURL, viewport, video, dual webServer
- Add E2E helpers: auth (mock getStatus), navigation, selectors, fixtures, API
- Add data-testid attributes to Layout, auth, nav, modal components
- Add E2E tests: home, auth-flow, community-browse, thread-lifecycle
- Add visual regression tests with toHaveScreenshot() for /components + key pages
- Add CI jobs for e2e-smoke and visual-regression in CI.yml
- Add .gitignore for test-results/ and visual-report/ output directories

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Remove visual snapshots from git, generate in CI instead

Baselines are platform-specific (darwin vs linux), so committing them
causes cross-platform mismatches. CI now runs test-visual:update to
generate fresh screenshots on every run and uploads them as artifacts
for human inspection.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Marcin Maslanka <maslankam92@gmail.com>

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