Add board input driver for button and LiPo ADC logging.

TODO: Hardware pinning in powerpod.h (TASTER_GPIO, V_LIPO_1/2_GPIO) does not
match final hardware yet — verify against schematic before production.

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

main/CMakeLists.txt

@@ -23,6 +23,7 @@ idf_component_register(
   "esp_now_comm.c"
   "esp_now_proto.c"
   "bosch456.c"
+  "board_input.c"
   "proto/uart_messages.pb.c"
   "proto/esp_now_messages.pb.c"
   "proto/pb_encode.c"
@@ -40,6 +41,7 @@ idf_component_register(
   esp_driver_gpio
   esp_driver_uart
   esp_driver_i2c
+  esp_adc
   app_update
   bma456)