various bug fixes

main/wifi_manager.h

@@ -41,6 +41,11 @@ bool wifi_manager_connected(void);
  */
 esp_err_t wifi_manager_wait_connected(TickType_t timeout_ticks);
 
+/**
+ * @brief Get the STA IP address as a string (or "No Wi-Fi" if disconnected).
+ */
+const char *wifi_manager_get_ip(void);
+
 #ifdef __cplusplus
 }
 #endif