iOS electrum settings ignore TLS selection and persist broken configs

[piotr-iohk]

Observed in local docker-compose regtest (where TLS isn't exposed)

To reproduce:

• Settings → Advanced → Electrum Server → change protocol to TLS while keeping default regtest host/port (60001) → tap Connect.

Actual:

Toast shows ElectrumUpdatedToast and the form claims connected, even though the regtest electrs only exposes TCP; the app also overwrites the saved server with the unusable TLS combo. Subsequent launches keep trying this bad config unless you reset manually.

Expected:

Matching Android behavior: the connection attempt should actually honor the selected protocol, display the error toast when TLS isn’t available, and roll back to the last working TCP config so the node comes back online.

Screen.Recording.2025-12-01.at.17.53.12.mov

[pwltr]

Fixed in #261. Just want to add a neutral note that this differs from how it works in the react native app with regards to rolling back the connection on failure.