Display the PDP variants and swatches for Commerce POS

1. Add a ColorSwatchUrl column to the product feed and populate it with the swatch image URL for each color variant. If separate swatch images are not available, temporarily use the same URL as imageUrl.

2. Set variant.IsVisible to true for the required variant products, then validate that the feed contains both color and ColorSwatchUrl so the backend can build the ColorSwatches array and the app can render color dots automatically when dimension name = 'Color'. 

3. If color dots still do not appear after updating the feed, provide a sample of 3-5 rows from the updated feed showing the new ColorSwatchUrl column and share the relevant masterProductId for a product where the issue persists.