[Feature]: Use standard HA CSS vars for weather icons

[smiller171]

Is your feature request related to a problem?

Currently Mushroom doesn't respect HA weather-icon css vars

Describe the solution you'd like

I'd like to see the weather icon logic work the same way as in the stock weather-forecast card so the icons can be themed correctly.

https://github.com/home-assistant/frontend/blob/dev/src/panels/lovelace/cards/hui-weather-forecast-card.ts

https://www.home-assistant.io/dashboards/weather-forecast/#personal-icons

Describe alternatives you've considered

No response

Additional context

No response

[KTibow]

In what card/case would you like to see this implemented in? It only makes sense in the weather chip to me.

[smiller171]

I can't think of any other context where this would make sense, though I could be missing something