Alan-Jowett / sonde / 24108601959

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feat(pair-ui): add board selector for I2C pin config (PT-1216) (#682)

Add a board-selector dropdown to the sonde-pair-ui provisioning screen
so operators can specify I2C pin assignments for different ESP32-C3
boards without entering raw GPIO numbers.

Board presets:
- Espressif ESP32-C3 DevKitM-1 (SDA=0, SCL=1) — default
- SparkFun ESP32-C3 Pro Micro (SDA=5, SCL=6)
- Custom (user-entered GPIO numbers, validated 0-21, SDA!=SCL)

The selected pin config flows through the Tauri \provision_node\
command to \phase2::provision_node()\, which encodes it as trailing
CBOR in the NODE_PROVISION message. The node firmware persists pins
to NVS at boot (ND-0608).

Changes:
- Requirements: new PT-1216, updated PT-0700 and PT-1214
- Design: new section 12.1 (board selector UI), updated pin config
  source in section 4.1
- Validation: 5 new test cases (T-PT-1216a through T-PT-1216e)
- Backend: \esolve_pin_config()\ helper, \i2c_sda\/\i2c_scl\
  params on both desktop and Android \provision_node\ commands
- Frontend: board \<select>\, custom pin inputs, \BOARD_PRESETS\
  table, client-side validation
- Tests: 5 unit tests for \esolve_pin_config\

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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