Seller Products Screen

List of the seller's physical products with status pills, variant counts, edit + delete actions, FAB to create. Pull-to-refresh re-invokes the controller.

1. Watches sellerProductsProvider AsyncValue.
2. Row tap → context.push('/seller/products/:id/edit').
3. Delete confirm → SellerProductsController.deleteProduct.
4. FAB → context.push('/add-product').

• Empty state suggests creating the first product with an illustration.
• Delete-failure dialog shows the server error verbatim (often 'product has active orders').

• lib/src/features/seller/products/views/seller_products_screen.dart

Status color mapping duplicated from the provisions screen — extract into a shared widget once stable.