No hover, by design
The kit styles no hover state anywhere in this family, and the Figma sheet agrees: its Hover variants are pixel-identical to Default, measured in this page’s parity audit. Focus, unlike on most families, can be forced honestly here: RadioButtonBase paints it from the isFocusVisible prop in the grid above.
Survives forced colors
Every part of this circle was a box-shadow ring or a background-color, and forced colors mode drops the first and flattens the second to Canvas. In Chromium’s forced-colors emulation, on the breadcrumbs account menu, which renders this circle as its selected marker: the circle, the selected fill and the dot all vanished, and selected and unselected rendered alike. The kit edit gives the circle a real border there, GrayText when disabled, and paints the selected dot in CanvasText, so rest, selected and disabled stay distinct in every cell above; that is stated from the source and the forced-colors rules, not re-measured on this grid. Nothing changes outside forced colors, and nothing moves inside it: the box is border-box at an explicit size.