cancelRequest method
Cancel a pending request by its ID.
Returns true if the request was found and cancelled.
The caller waiting on that request will receive a SignerRequestCancelledException.
Note: This is a "soft cancel" - the remote signer (bunker, browser extension, etc.) may still have the request pending. If the user approves on the remote side after cancellation, the result will be ignored.
Implementation
@override
bool cancelRequest(String requestId) => false;