The Local Network permission prompt (NWBrowser for _ts3._tcp) was
never actually triggered anywhere in the app. The service defined
triggerLocalNetworkPrompt() but no code called it.
Now _onConnect() checks the local network state before connecting.
If the state is unknown or notDetermined, it triggers the NWBrowser
scan which shows the system Local Network Privacy dialog on macOS 15+.
This ensures the prompt appears before the connection attempt so the
user can grant permission and the connection succeeds in one flow.
Non-macOS platforms are unaffected (short-circuited by the service).
Edison Jwa
ab0dc2ebc2