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/powerpod.c

@@ -207,6 +207,7 @@ void app_main(void) {
   }
 
   led_ring_init();
+  led_ring_boot_anim();
 
   if (app_config.master) {
     cmd_queue = xQueueCreate(64, sizeof(generic_msg_t));
@@ -240,7 +241,7 @@ void app_main(void) {
     cmd_set_log_level_register();
   }
 
-  ESP_LOGI(TAG, "LED ring: UART LED_RING commands only (no local demo loop)");
+  ESP_LOGI(TAG, "LED ring: boot anim + UART LED_RING commands");
 
   /* After OTA: PENDING_VERIFY until confirm; crash before this → rollback. */
   ota_confirm_schedule();