[🔨 WIP] Support responsive overflow in ButtonGroup #7186
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Closes https://github.com/github/primer/issues/6096
ButtonGroup.tsx, including logic to measure button widths, calculate how many buttons fit, and move excess buttons into an overflow menu triggered by an icon button. The overflow menu usesAnchoredOverlayfor accessibility and keyboard navigation.overflowAriaLabelprop toButtonGroup, with a default value of "More actions", ensuring the overflow trigger button is accessible to screen readers.Changelog
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Changed
Removed
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