Refactor Bluetooth service and enhance JSON payload handling

Merge remote updates and keep local sensor app changes.

Enhance sensor data handling and update measurement units

refactor: update salinity and TDS units to mg/L and adjust related calculations

refactor: streamline calibrated readings and improve display logic

add image file resolution logic and corresponding tests

export error 5 rectified

export error 4 fixed

fixed export error 3

fixex export error 2

fixed the export error 1

Update npk_soil_sensor subproject reference to latest commit, marking it as dirty for tracking changes.

Merge remote-tracking branch 'origin/main'

fix ble and json parsing issues

Update charts initialization and enhance export functionality for iOS