saveUserConfig

Routes the User config save: ham onboarding (set_ham_mode) when the licensed toggle transitions OFF→ON on the locally connected node, setOwner otherwise. Routing on the transition — not the toggle state — keeps subsequent saves of an already-licensed node on the set_owner path, so edits to other owner fields still reach the device and the node doesn't reboot on every save (firmware reboots on set_ham_mode). The local-node guard is the backstop for the UI gate — set_ham_mode must never be sent to a remote node.