Boost modal UI enhancements
- make the description of sidebar boosts more descriptive
- button should have the same shape as other buttons
- figure out why there is just one boost option and if there's always going to be just one, the UI should reflect that
- fix unexpected cursor pointer behavior
- if 'offchain' is default, it should be first
- move 'buy tokens' somewhere else or make it look different from the onchain/offchain choice