MARKETPLACE INTEGRATION:
- Added 'Marketplace' (/buy) to public Header navigation
- Renamed 'For Sale' to 'Marketplace' in Command Center Sidebar
LISTINGS PAGE REDESIGN:
- Added tab-based layout: 'Browse Marketplace' / 'My Listings'
- Browse tab: Search + grid view of all public listings
- My Listings tab: Full management with stats
- Unified experience to view marketplace and manage own listings
SEO JUICE DETECTOR FIX:
- Fixed 500 error when database table doesn't exist
- Added fallback: _format_dict_response for when DB is unavailable
- Service now gracefully handles missing tables
- Returns estimated data even on cache failures
1e6036c03f