- Add web-vitals package with LCP/CLS/INP/FCP/TTFB → Umami tracking
- Set GlitchTip user context on login, clear on logout
- Add funnel events: first_content_created, user_return_visit,
second_module_used, guest_converted
- Track first content via Dexie creating hook (fires once per user)
- Track module usage via route navigation effect
- Track guest→registered conversion on signup
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>