Bug: Withdraw fails due to missing relayer signature

## Problem
<img width="366" height="605" alt="Image" src="https://github.com/user-attachments/assets/e41a15ce-6e13-4188-9baa-e1c5bacb1c28" />

## Possible causes

<img width="908" height="487" alt="Image" src="https://github.com/user-attachments/assets/191f08fc-e6da-4ed7-912e-e846195c6581" />
It seems that the relayer is not signing the transaction in the sdk response. Check with shadowwire team.