ui suggestion: asset logos should be interactive

[buck54321]

Maybe a couple of different things we can do

1. Hovering over an asset's logo could bring up a floating information panel of some kind that tells you about your holdings and the fiat exchange rate and such.
2. Clicking on an asset's logo could bring you to the /wallets view for that asset

This could be a universally available gesture across all views for all assets' logos.