refactor(web): split MarketplaceView into marketplace-view module
- types: MarketplaceViewProps, MarketplaceCategory; useMarketplaceView with marketplaceService/fallback
- MarketplaceViewHeader, MarketplaceViewCategories, MarketplaceViewSidebar, MarketplaceViewGrid, MarketplaceViewSkeleton
- allProducts for ProductDetailView similarProducts; min-h-screen -> min-h-layout-page
- Stories: Default, Loading (Skeleton); decorator min-h-layout-page
- Re-export from MarketplaceView.tsx
Co-authored-by: Cursor <cursoragent@cursor.com>
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