Fix for issue 704: Accept negative values on individual devices

[mypi-home]

feat: Allow negative values for primary individual entities (fix for issue 704)

This change introduces the accept_negative option for primary individual device configurations.

Previously, primary individual entities would always display the absolute power value. With this update:

• The IndividualDeviceType now includes an accept_negative boolean property with UI component added to enable this.
• If accept_negative: true is set in the card configuration for an individual device, the card will now display its actual state, including negative values.
• If accept_negative is false or not specified (defaulting to false), the card will continue to display the absolute value as before.

This aligns the behavior of primary individual entities with secondary info entities regarding the handling of negative values.

Additionally fixed decimal handling to also work for negative values.

TO-DO: Fix logic for display zero not to consider negative numbers as zero.

This change is tested in Local js file in HASS - test results posted on the issue here:
#704

[Stuart0411]

@mypi-home does this only work for secondary information? It doesnt seem this can be used for the individual entity, and also doesnt change the direction of flow in the animation