chat: user-friendly INFO logs for invite/connect flow

- chat_sync.c: invite entry, JOINED/TIMEOUT messages
- conn_mgr_core.c: invite start (addrs+udp+tcp), NCD UP/DOWN/TIMEOUT,
  TCP connect/ready/close, membership check send/receive/confirm/deny,
  overall timeout
- node_conn_direct.c: NCD event names instead of numbers

tools/chatgui/transport/utun_node.cpp

@@ -386,6 +386,8 @@ void UtunNode::runLoop() {
 
     etcp_router_bind(m_instance, ETCP_RT_ID_CHAT, recvCallback);
 
+    utun_add_nodeinfo_cbk(m_instance, gui_nodeinfo_cb_impl, nullptr);
+
     /* Bridge chat events to GUI via gui_bridge */
     chat_event_set_handler([](int type, const uint8_t* data, int len) {
         gui_bridge_post(type, data, len);