[Co-staking] - Unhappy path

[gbarkhatov]

We need to implement the error handling for Dual Reward Claims:

• Currently, the rewards page claims BTC and BABY rewards sequentially in handleProceed. If one claim succeeds and the other fails, there's no proper error handling or user feedback
• scenario 1 - both success
• scenario 2 - btc success, baby fail
• scenario 3 - btc fail, baby success
• scenario 4 - both fail

Originally posted by @gbarkhatov in #292 (review)