* Do not connect to default device during app startup
* Connect to last selected machine automatically even if it's lan machine
Simplify default machine connection logic
* Select last machine automatically when available
* Check for LAN connection state after updating combobox selection.
This matches the logic of `SendPrint.cpp`.
* Avoid showing same error message multiple times until next connection attempt.
---------
Co-authored-by: SoftFever <softfeverever@gmail.com>
4acda7d003