[cashtab] Transaction row UI

Summary:
Proposed ui updates to the transaction rows on the home view.
Basically some general tweaks to improve readability, make it look less cluttered, and help visually pair the transaction with
the transaction info (ie messages and token info etc)

Test Plan:
preview and check the UI looks nice in different scenarios

before

after

Overall subtle changes, but the things to notice

• added a background to the row so each tx is visually contained and we can lose all the lines
• removed copy icon next to amount. Functoinality remains but removes the clutter as most the time this is unused
• improved castab messages display. before shorter messages would display on the right
• add background circle to icons

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: Fabien, bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D17996