Max Staking CAP Causes MetaMask Error

Users have reported that when using the max stake shortcut, the rounding up of the wallet balance triggers a MetaMask error.

Wanted to see which approach you preferred to resolve this @kappacappa, or if you have another idea.

#### Add separate Stake/Unstake All buttons to the main staking page that bypass the modals (and rounding) entirely:


Since the current modal is also where CAP approval takes place if needed, might need to add a new ApproveCAP modal to popup if needed.

#### Add "Stake All" and "Unstake All" buttons to the modals which directly trigger the staking/unstaking with exact balances instead of populating the Input component with a rounded value:


It would probably also make sense to update the modal to display just the "Approve CAP" button and nothing else when the modal opens if CAP allowance is not non-zero.

#### Keep the current design as-is, but do not round up CAP wallet balance.

This would be the simplest fix but also probably the least good from user's perspective IMO.