MeshCore POTA gateway — firmware drop for browser flash
=======================================================

The live flasher is not the old v0.2 folder. It loads one manifest
per board from the v1.17.1+ test set:

  https://getontheair.app/downloads/meshcore-test/build-pota-all-7b99c725/

  Heltec_v3_room_server_pota/
  heltec_v4_room_server_pota/
  heltec_v4_r8_room_server_pota/
  Xiao_S3_WIO_room_server_pota/

Each of those folders needs firmware.bin, bootloader.bin,
partitions.bin, boot_app0.bin, and manifest.json. The utility page
https://getontheair.app/meshcore-pota/ picks the board, then the
Install button uses that folder's manifest. When prompted, erase
the device.

The XIAO image is the SX1262 (WIO) board, not the loose-radio Xiao_S3
pinout. It has no OLED. Status is the serial pota command.

ESP32-S3 offsets (Arduino / PlatformIO):

  0x0000   bootloader.bin
  0x8000   partitions.bin
  0xE000   boot_app0.bin
  0x10000  firmware.bin

boot_app0.bin is required: this partition table has two OTA slots.
Without it the browser flasher writes app0 and the chip can still boot
the old image in app1.

PlatformIO from branch build/pota-all:

  pio run -e Heltec_v3_room_server_pota -t upload -t monitor
  pio run -e heltec_v4_room_server_pota -t upload -t monitor
  pio run -e heltec_v4_r8_room_server_pota -t upload -t monitor
  pio run -e Xiao_S3_WIO_room_server_pota -t upload -t monitor

The rest of that tree (repeaters, companions, sensors) is listed at
https://getontheair.app/meshcore-test/

Overlay zip: /downloads/meshcore-pota-gateway.zip
Notes:       https://getontheair.app/guide/software/meshcore-pota/