refactor(Popover, Menu): migrate slide animation from CSS to motion component#35665

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robertpenner wants to merge 13 commits intomicrosoft:masterfrom

robertpenner:refactor/popover-motion-component

Commits on Jan 28, 2026

feat(react-positioning): add PositioningSlide motion component and getSlideOffsets utility
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refactor(react-menu): migrate MenuPopover from CSS slide to PositioningSlide motion component
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refactor(react-popover): migrate slide animation from CSS to PositioningSlide motion component
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chore: add change file for react-positioning
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chore: fix lint
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feat(react-motion): export useAnimateAtoms, useIsReducedMotion, and AnimationHandle
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feat(react-positioning): add useSlideAnimation hook for imperative WAAPI animations
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refactor(react-popover): use useSlideAnimation for imperative slide animation
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refactor(react-menu): use useSlideAnimation for imperative slide animation
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docs: add RFC for imperative WAAPI slide animation approach
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chore: update change files and remove PositioningSlide component
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docs: update popover animation doc
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chore: rename
robertpenner
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