Update CSV export column headers to use underscores instead of spaces for better compatibility with data processing tools: - Vendor Product number → Vendor_product_number - Vendor code → Vendor_code - Vendor name → Vendor_name - Dealer product number → Dealer_product_number - Zip code → Zip_code 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>