Lack of bridging gas refunds

Note that _redeemSharesAndBridgeToStable does not appear to refund the excess fees from LayerZero message sending. It would be best practice to include this; however, we do not consider the lack of a fee refund to be an issue, because the code includes recovery functions. Additionally, a user would have to manually interact with the contract — and mistakenly send too much — to cause this to be an issue.