Make shopping list checkable and group smartly

The shopping list is currently sorted alphabetically, which is inconvenient in practice – especially for a long week's shopping. In the supermarket, you walk by department, not by letter.

Grouping by product type would greatly improve this. For instance, at the produce section, you can see at a glance which vegetables you need, check them off, and then walk on to the next section. That saves searching and walking back and forth.

Two concrete points for improvement:

• Grouping by category (e.g., vegetables, dairy, meat) instead of alphabetical order
• Checkbox function per product, so you keep track of what is already in your basket.

Both functions are currently missing and are clearly missed.