Persist accelerometer deadzone in NVS across reboots.

Each node saves its local deadzone on UART or ESP-NOW set; pod_settings loads and applies it after BMA456 init.

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

main/powerpod.c

@@ -22,6 +22,7 @@
 #include "board_input.h"
 #include "bosch456.h"
 #include "led_ring.h"
+#include "pod_settings.h"
 #include "uart.h"
 #include <stdint.h>
 
@@ -66,6 +67,10 @@ uint8_t reverse_high_nibble_lut(uint8_t n) {
 }
 
 void app_main(void) {
+  if (pod_settings_init() != ESP_OK) {
+    ESP_LOGW(TAG, "settings NVS init failed; using defaults");
+  }
+
   // Get Master Mode Pin
   gpio_reset_pin(DIP_MASTER);
   gpio_set_direction(DIP_MASTER, GPIO_MODE_INPUT);
@@ -125,6 +130,8 @@ void app_main(void) {
     esp_err_t bma_err = init_bma456(bus_handle);
     if (bma_err != ESP_OK) {
       ESP_LOGI(TAG, "BMA456 init skipped: %s", esp_err_to_name(bma_err));
+    } else {
+      pod_settings_apply_accel_deadzone();
     }
   }