auto-connect + GUI per-channel indicators

- chat_core_connect_auto: direct ETCP connect from SQLite (no BGP)
- auto_connect: parallel connect to peers with 3s timeout, retry 10s
- RTT saved to node_addresses on disconnect
- vertical status bar + circle badge with online count per channel
- ChannelListView prevents deselection

tools/chatgui/transport/utun_node.cpp

@@ -241,7 +241,8 @@ void UtunNode::runLoop() {
     /* Initialize chat_core (DB) and chat_sync (channel/message P2P sync) */
     chat_core_init(m_instance, m_dbPath.toUtf8().constData());
     chat_sync_init(m_instance, nullptr);
-    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "chat_core + chat_sync initialized");
+    chat_sync_auto_connect_start(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "chat_core + chat_sync + auto_connect initialized");
     DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "utun_node: entering poll loop");
 
     while (!m_stop) {