feat(#1807): prefers-reduced-motion defaults for Collapsible transitions

[kotAPI]

Summary

• Add SSR-safe usePrefersReducedMotion hook with tests.
• Collapsible content uses zero transition duration by default when prefers-reduced-motion: reduce is enabled and transitionDuration is omitted.
• Document default behavior in Collapsible Storybook and add a changeset.

Test plan

• npm test -- --testPathPatterns=usePrefersReducedMotion|Collapsible/tests/Collapsible.test
• Verify Collapsible open/close in Storybook with reduced motion enabled in OS/browser settings

Closes #1807

[changeset-bot]

🦋 Changeset detected

Latest commit: 98ab10e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@radui/ui	Patch

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fc62d465-4738-45ce-aa1d-325e4306e104

📥 Commits

Reviewing files that changed from the base of the PR and between fe87b36 and 98ab10e.

📒 Files selected for processing (9)

• .changeset/prefers-reduced-motion-collapsible.md
• src/core/hooks/usePrefersReducedMotion/index.ts
• src/core/hooks/usePrefersReducedMotion/usePrefersReducedMotion.test.tsx
• src/core/hooks/usePrefersReducedMotion/usePrefersReducedMotion.ts
• src/core/primitives/Collapsible/contexts/CollapsiblePrimitiveContext.tsx
• src/core/primitives/Collapsible/fragments/CollapsiblePrimitiveContent.tsx
• src/core/primitives/Collapsible/fragments/CollapsiblePrimitiveRoot.tsx
• src/core/primitives/Collapsible/stories/Collapsible.stories.tsx
• src/core/primitives/Collapsible/tests/Collapsible.test.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/issue-1807-prefers-reduced-motion

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[github-actions]

Coverage

This report compares the PR with the base branch. "Δ" shows how the PR affects each metric.

Metric	PR	Δ
Statements	75.78%	+0.05%
Branches	59.25%	+0.08%
Functions	61.82%	+0.07%
Lines	77.31%	+0.05%

Coverage improved or stayed the same. Great job!

Run npm run coverage:ci locally for detailed reports and target untested areas to raise these numbers.

[kotAPI]

Code review

LGTM. Matches project patterns for portal Theme refs, Floating UI prop merge, controlled-switch/lazy-mount/RTL tests, or focused bug fixes. No changes requested.