Compatibile with ESPHOME 2025.12

Fixed small syntax issue with ESPHOME 2025.12.x

Reduce wear on NVRAM by throttling to once per minute

NVRAM wear reduces the lifetime of the ESP32 hardware. This code reduces it to once per minute and can be monitored by DEBUG logging.

Persistence of data across ESP32 restarts

These changes implement persistence of data across restarts of the ESP32 board.

The Total Energy sensor continues accumulating after the board restarts from where it left off.
The Daily Energy does similar but is reset to zero at the beginning of each day.

Includes test code for persistence over ESP32 restarts

Update powerpal_ble.h

For persistence

1.0.0

Adapted from muneeb1990 and weekendwarrior1 before them.

Works with ESPHOME 2025.7.0 and later