[Transactions] Add detail about refunds

Currently, card transactions only show the final amount the user has been charged (including partial refunds). This means that it is not possible to see the original amount of a card transaction. For example, all fully refunded transactions would show up as for $0.00 and in a gray color, without any other distinguishing features apart from the transaction name, unless of course you have admin access. If a partial refund has been issued no detail about the original transaction shows up at all.

I would like to propose adding more detail about how much a card was charged and refunded seperately. This could also include dates of when the card was charged/refunded.

Additionally could the user also be emailed about refunds (similar to how they are emailed about a transaction such that they upload a receipt)?

The issue does not identify any files, tests, or entry points. First map the existing card-transaction and refund flows, then clarify whether the goal includes original and refund amounts, charge/refund dates, refund emails, or all three before implementation; done should be defined by the agreed transaction display and notification behavior.

Written by the indexing model from the issue text.