Interface: Staking balance updates

[jurevans]

Currently, when we submit a bond, unbond, or withdraw, the interface is not correctly updated with new balances.

Any change to staking should update the following:

• bonded, unbonded, or withdrawn amount changes
• fetch balances to show balance after staking minus gas fee

Staked amount changes could simply be optimistically updated if we know the transaction succeeded, so we don't need to query for new values immediately.