Price products by catalog name rather than market name

The pricing columns on the Products sheet now follow catalog names rather than markets. In Shopify a catalog holds the price list and the product availability, so a catalog can have its own title, serve several markets, or belong to a B2B company location.

🚀 What’s new

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• B2B catalogs - product exports now include the Included, Variant Included, Price, and Compare At Price columns for B2B company location catalogs.
• Catalog titles on import - a pricing header matches a market first and a catalog title second, so Price / EUR Pricing now works.
• Price lists on demand - a catalog matched by its title gets a price list created when a Price column needs one.

🔧 Improvements

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• One column set per catalog - exports label each set with the catalog title, market catalogs first, then B2B catalogs (see Pricing by Catalogs).
• Shared catalogs appear once - a catalog serving several markets gets one set of columns instead of one set per market.
• Tidier exports - archived catalogs are left out, and a market without a catalog gets no columns at all.
• Files round trip - an export imports back unchanged, and older files that use market names still import.