[Feature Request] Adding custom UNIT for custom sensors in themes

Is your feature request related to a problem? If so, please describe the problem.
Nope, it's a feature request for custom sensors only

Describe the feature / solution to your problem you'd like
Adding custom unit to text value

Describe alternatives you've considered / and or tested
None, because using special characters in value (°C is displayed as °ÂC for example) is breaking text

Screenshots / photos & mockups of the Turing screen
I'm adding GPU Hotspot temperature instead GPU Temperature:
With °C unit in value: https://i.imgur.com/BdpDvTq.png
With custom unit: https://i.imgur.com/2ER0iSN.png

Environment:

• Revision of this project: 3.9.1 Release
• OS with version: Win11 64 pro
• Python version: 3.12
• Hardware: 5800X3D, 6750XT

Additional context
I just added this line in "./library/stats.py" at line 100: unit = theme_data.get("UNIT", unit)

To allow custom sensors in theme to use specific unit for a value.
And of course, adding a "UNIT" in custom sensor in my theme ("UNIT: °C" for me)

Start in library/stats.py, especially the custom sensor handling around the reported unit lookup. Review how custom sensor values and theme data are parsed, then verify that a UNIT value such as °C is applied to the rendered sensor without encoding corruption. Done means custom sensors can define their own displayed unit while existing sensors remain unchanged.