[Bug Report][4.1.7] v-icon-btn icon is invisible on colored backgrounds due to identical foreground and background color rendering
S: triage
### Environment
**Vuetify Version:** 4.1.7
**Vue Version:** 3.5.25
**OS:** Windows 10 (current)
### Steps to reproduce
1. Use v-icon-btn inside a colored background e.g. card with primary color
2. Icon and surrounding circle are both white / transparent
### Expected Behavior
The icon within v-icon-btn should automatically adjust its contrast against the circular background to remain visible, matching the functional behavior of a standard v-btn with the icon prop.
### Actual Behavior
The v-icon-btn icon and its background both render as solid white. The icon is not visible. See the provided screenshot or playground for visual comparison.
### Reproduction Link
[https://play.vuetifyjs.com/#...](https://play.vuetifyjs.com/#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)
### Other comments
I added 4 examples inside the playground, showing the different behavior of the v-icon-btn versus the normal v-btn. If my usage is wrong please inform me of correct usage.
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