Point of Sale - Payment Method Image

This module adds a picture to Point of Sale payment methods and displays it to cashiers on the payment screen.

• On the payment method form (Point of Sale configuration), a new image field appears next to the company field, so you can upload a logo or picture for each payment method.
• In the Point of Sale payment screen, each payment method is now shown with its image above the payment method name instead of just the name.
• If no image has been uploaded, the module falls back to a built-in icon depending on the payment type: a money icon for cash, a pay-later icon for pay later, and a card/bank icon for other types.

The image is loaded into the Point of Sale session together with the other payment method data, so it is available offline in the Point of Sale interface. The module touches the pos.payment.method model (new image field), the pos.session model (to include the image when loading payment methods), the payment method form view, and the Point of Sale payment screen component.