Fee-only action information in Transaction history

[omnat]

Full feature brief

This brief describes the problem with user insights, and recommends a solution scope and incremental steps to improve the history. https://docs.google.com/document/d/1KcdMu5CGRtJjA5GfkjEkTD-DUTLC6TctbB71qkypGaE/edit#heading=h.8537h6t8tw3s

Minimal improvement for fee-only actions

This specific piece of improvement mentioned in the doc could help avoid confusions of fee-only actions like #38

Give information of what that transaction was about : action name and how much user paid
Add a new value type - fee only. Show this for actions like Approve that only cost fee, so what user paid is reflected clearly

cc @rachelcope

[bdresser]

I think the issue is often that the fee amount is smaller than the number of decimals we're showing.

We could totally have some visual indicator that a given transaction just cost a transaction fee, but I think the important bit is not rounding that total amount down to 0.

On any of those tx entries, you can see the very small real tx amount by expanding: