swap resume: accepts empty/whitespace --from-tx-hash and submits invalid confirm proof

[claytonlin1110]

Summary

resume does not validate transaction hash after stripping whitespace.

In allways/cli/swap_commands/resume.py:

from_tx_hash = from_tx_hash_opt.strip()
accepted, queued = sign_and_broadcast_confirm(
    ...
    from_tx_hash,
    ...
)

There is no if not from_tx_hash check after .strip().

Why this is a real bug

If user passes whitespace hash (e.g. --from-tx-hash " "), code converts it to "" and still proceeds to sign_and_broadcast_confirm, generating proof message allways-swap: with an empty tx hash.

So the command deterministically tries to confirm with an invalid tx hash instead of failing fast.

Reproduction

• Run: alw swap resume --from-tx-hash " " --yes
• Observe command proceeds to “Confirming with validators...”
• It sends confirmation attempt with empty tx hash instead of rejecting input locally.

Expected behavior

CLI should reject empty/whitespace tx hash immediately with a clear error, same as post-tx flow.