Off icon colour doesn't follow browser primary colour

[Morphy99]

Checklist:

• [ x] I updated to the latest version available
• [ x] I cleared the cache of my browser

Release with the issue:
Slider V1.13
HA 2025.5.3

Last working release (if known):

Browser and Operating System:

Chrome Windows 137.0.7151.70 (Official Build) (64-bit)

Description of problem:

I have changed the primary colour in my HA browser settings to purple but the icons on this card are staying blue:

I have tried changing use_state_color: to false but this then results in the icon being white, which isn't correct either.

Javascript errors shown in the web inspector (if applicable):

Additional information: