OCR line item improvements

Following up on two small pains I noticed with the current itemization on the snap feature (by doing manual assignment of items to people):

1. Missing quantity per line. OCR-generated items don't show quantity. In a claiming flow, this is critical — people need to know if an item is "1x" "2x" to know how many people to split that item.

2. Line items inherit the invoice name instead of the item name. Everything currently shows up as e.g. "Xiringuito Beach Club Meal" instead of the actual item. People can't tell items apart when they are split by different people.

   • Suggestion: Combine invoice name + item name, e.g., "Xiringuito Beach Club Meal - Sumo do dia".

There 2 improvements could also be carried over to the collaborative item claiming feature if you decide to build it: https://bananasplit.featurebase.app/p/feature-idea-collaborative-item-claiming-for-large-groups :) For collaborative claiming to work well at scale, people need to clearly see what each item is and how many are available to claim — so these two fixes are especially important there.