Track page views, results clicks, copy-to-email on market page.
Track login events with auth method (SSO/email) and L'Oréal domain detection.
New analytics.html dashboard with charts (Chart.js), period/page filters.
Localhost auth bypass for local dev testing.
Post-deploy: run npm run migrate to create usage_events table.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>