Add LED ring boot chase and connect flash animations.

Give pods quick visual feedback on power-up and when a slave joins the master.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/esp_now_slave.c

@@ -718,6 +718,7 @@ static void handle_discover(const uint8_t *sender_mac,
            (unsigned)discover->network, mac_str,
            (unsigned long)preferred_id_for_master());
 
+  led_ring_connected_anim();
   queue_tx(SLAVE_TX_SLAVE_INFO);
   /* Battery after ASSIGN_ID so reports carry the definitive client_id. */
 }