feat(login): auto-proceed upon signer response

don't ask the user to press any key to proceed once the signer
successfully responds.

various approaches were to tried await either any key press or the
signer reponse such as `tokio::oneshot`, `tokio::mpsc` and
`tokio::watch` but all would keep the process running until key
press. this solution of aborting with `signal::ctrl_c` prevents the
work around of asking the user to press any key upon
the signer reponse.

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