improve fee rendering in approval dialogue

[TalDerei]

references penumbra-zone/web#1311 and penumbra-zone/web#1358. One of the side-effects of the migration is that these same changes should be propagated to the web ui package for minifront to consume.

• fees don’t have metadata, so modifies swap claim fees to display the proper amounts and denoms (rather than incorrectly hardcoding upenumbra for all trades)
• fixes pill size in transaction approval dialogue

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[grod220]

Left comments in penumbra-zone/web#1419