- Moves server configuration from the wallet panel into an overlay
(Impostazioni → Server), same pattern as the address detail overlay
- Splits the single "host:port" text box into separate Host and Port
fields; port changes auto-toggle the TLS checkbox when the typed
port matches a known SSL/TCP port, and vice-versa
- Adds DisconnectAsync() so changing server/TLS reconnects to the new
endpoint instead of reusing the old socket
- Adds i18n keys (IT/EN/ES/FR/PT/DE) for the new overlay
- Removes the server row from the main wallet panel; connection status
indicator (green/red dot) is now shown in the wallet header