- Update loadProducts() to show all Letzshop marketplace products when
no vendor is selected, filtered by vendor when one is selected
- Add vendor column to products table (shown when no vendor filter)
- Update header to show context-aware subtitle
- Hide Import/Export buttons when no vendor selected
- Remove "Marketplace Products" from sidebar menu (accessible via
Marketplace > Letzshop > Products tab)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>