chore: add changeset for INP performance optimizations

Author: mattcosta7

.changeset/performance-inp-optimizations.md

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+---
+"@primer/react": patch
+---
+
+Performance: Optimize CSS `:has()` selectors and JavaScript hooks for improved INP
+
+- Scope CSS `:has()` selectors to direct children across Dialog, PageHeader, ActionList, Banner, ButtonGroup, AvatarStack, Breadcrumbs, SegmentedControl, TreeView, and SelectPanel
+- Simplify `useResizeObserver` API with automatic requestAnimationFrame throttling and native resize events for window
+- Optimize `useAnchoredPosition` to use refs instead of state for non-rendering values
+- Add `useTreeItemCache` hook for caching TreeView DOM queries with MutationObserver invalidation
+- Throttle MutationObserver callbacks in AvatarStack and Announce components
+- Add rAF throttling to `useOverflow` hook
+- Optimize `hasInteractiveNodes` utility with querySelectorAll and attribute-first checks