Refine Wi-Fi, mDNS, and terminal lifecycles

- Stage disabled station profile edits without restarting the radio
- Make mDNS initialization failure-isolated and reannounce in place
- Document deferred admin actions and explicit browser disconnect
  behavior

src/wifi_manager.c

@@ -884,8 +884,11 @@ static void handle_message(manager_runtime_t *runtime,
 
     case MESSAGE_COMMAND_MDNS_REANNOUNCE:
         if (runtime->online) {
-            mdns_service_stop();
-            start_mdns_announcement();
+            esp_err_t error = mdns_service_reannounce();
+            if (error != ESP_OK) {
+                ESP_LOGW(TAG, "mDNS reannouncement unavailable: %s",
+                         esp_err_to_name(error));
+            }
         }
         break;