The `RAININ` suppose to be accumulated rainfall in 60 minutes. So the
unit must be in `mm/h` or `in/h`.
In the opposite `DAILYRAIN` is rain in the day do far, represented in
accumulated `mm` or `in`.
Updates the wind direction sensor to use `MEASUREMENT_ANGLE` state class for proper representation in Home Assistant.
This ensures correct interpretation of wind direction as an angle.
Includes new sensor connection status constants and mappings
Updates WeatherSensor to handle null data values
Switches temperature unit to Celsius for WSLink sensors
Refines heat and chill index calculations with unit conversions
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