AiFi Operations 2

- Segment count visible while editing: You can now see the total number of segments on a shelf at a glance, making it easier to plan how to distribute products without counting by hand.
- Smarter UPC-E handling: Scanning a UPC-E barcode now finds products stored as UPC-A (and vice versa) automatically, with a toast confirming when a conversion was applied. No more "Product not found" errors caused by barcode format mismatches.
- Better tablet experience: Shelf segments no longer stretch across the full width on tablets and larger devices. The shelf is now centered with a max segment width, so dragging and editing feels much more comfortable.