Show a welcome card on the dashboard when no sync runs exist yet. Guides new users: 1. Check Settings → 2. Start Sync → 3. Map SKUs. Card auto-hides after first successful sync. Cache-bust: dashboard.js?v=31, style.css?v=24 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>