Fix IKEA STARKVIND native unit of measurement

[noahwilliamsson]

Describe your changes

Change native_uom to native_unit_of_measurement and make use of unit constants.

Fixes the following error message, as seen with at least Home Assistant 2025.7 and later.

2025-08-07 00:00:00.000 ERROR (MainThread) [homeassistant.components.sensor] Error while setting up dirigera_platform platform for sensor: ikea_starkvind_air_purifier_sensor.__init__() got an unexpected keyword argument 'native_uom'
homeassistant  | Traceback (most recent call last):
homeassistant  |   File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 451, in _async_setup_platform
homeassistant  |     await asyncio.shield(awaitable)
homeassistant  |   File "/config/custom_components/dirigera_platform/sensor.py", line 67, in async_setup_entry
homeassistant  |     await add_air_purifier_sensors(async_add_entities, platform.air_purifiers)
homeassistant  |   File "/config/custom_components/dirigera_platform/sensor.py", line 112, in add_air_purifier_sensors
homeassistant  |     ikea_starkvind_air_purifier_sensor(
homeassistant  |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
homeassistant  |         device=air_purifier,
homeassistant  |         ^^^^^^^^^^^^^^^^^^^^
homeassistant  |     ...<4 lines>...
homeassistant  |         icon_name="mdi:clock-time-eleven-outline",
homeassistant  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
homeassistant  |     )
homeassistant  |     ^
homeassistant  | TypeError: ikea_starkvind_air_purifier_sensor.__init__() got an unexpected keyword argument 'native_uom'

Checklist before submitting a pull request

• Updated base lib and added the required version in the requirements.txt and manifest.json

Checklist for reviewer

• Select "Squash and merge" to keep commit timeline clean