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- track.js captures first-touch source per session (utm_source/src param or external referrer domain) and logs bridge/start page views. - Join clicks now carry the source; all events aggregate per-source in data/analytics.json on the persistent volume. - Admin: new Traffic & Conversions card with funnel totals (bridge -> start -> join click rates) and a per-source breakdown table. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>