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

src/utun_instance.c

@@ -371,6 +371,7 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
 
     // Cancel NTP timer
     ntp_time_destroy(instance);
+    ntp_node_time_destroy(instance);
 
     // Shutdown message transport server
     if (instance->msg_t) {
@@ -617,6 +618,11 @@ int utun_instance_init(struct UTUN_INSTANCE *instance) {
         DEBUG_WARN(DEBUG_CATEGORY_GENERAL, "NTP time sync init failed (non-fatal)");
     }
 
+    // Initialize NTP node time exchange (non-fatal)
+    if (ntp_node_time_init(instance) != 0) {
+        DEBUG_WARN(DEBUG_CATEGORY_GENERAL, "NTP node time exchange init failed (non-fatal)");
+    }
+
     DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "Connections initialized successfully");
     return 0;
 }