SegmentedControl.IconButton has no tooltip on hover (a11y issue)

SegmentedControl.IconButton has no tooltip on hover (a11y issue): a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). We use SegmentedControl.IconButton to render an icon-only segmented control (e.g. a view-mode switcher with just icons, no labels). The aria-label is set on each…

The task

We use SegmentedControl.IconButton to render an icon-only segmented control (e.g. a view-mode switcher with just icons, no labels). The aria-label is set on each button so screen readers announce them correctly, but sighted users get nothing on hover — there's no visible…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.