new client connection logic

- esp32 requests for image when ready to receive
- server serves initial image on request

components/audio_client/audio_client.h

@@ -40,11 +40,17 @@ void audio_client_set_image_notify_task(TaskHandle_t task);
 
 /**
  * Get the latest status image descriptor.
- * @param updated  Set to true if a new image arrived since last call, then reset.
+ * @param updated  Set to true if a new image arrived since last call.
  * @return Pointer to the static image descriptor (always valid).
  */
 const lv_img_dsc_t *audio_client_get_status_image(bool *updated);
 
+/**
+ * Acknowledge that the status image was successfully rendered.
+ * Clears the updated flag so subsequent get_status_image calls return false.
+ */
+void audio_client_ack_status_image(void);
+
 #ifdef __cplusplus
 }
 #endif