Product search and barcodes

Products can be found by typing or by scanning. Barcode lookup resolves a scanned code to a product, so a standard USB or Bluetooth scanner behaves like a keyboard and drops the item straight into the cart.

The access matrix lists pos.view_products, which all roles hold by default, and it is enforced on the server: product search, barcode lookup and the quick-pick grid all refuse a role that does not hold it. Because the catalogue is shared, unticking it also empties the product pickers in Inventory, Invoicing and Repairs — it is a catalogue permission, not only a POS one. The public webshop is unaffected.