test: Add comprehensive test coverage for hasInteractiveNodes utility

[Copilot]

Changelog

New

• Added comprehensive test suite for hasInteractiveNodes utility (35 tests total)
• Tests for all interactive element types: button, a[href], select, input, textarea, audio[controls], video[controls], [contenteditable], summary
• Tests for non-interactive states: [disabled], [hidden], [inert], display:none, visibility:hidden, tabindex="-1"
• Tests for ignoreNodes parameter behavior
• Performance scenario tests: large DOM trees, early termination optimization
• Complex scenario tests: deeply nested structures, mixed valid/invalid elements

Changed

• None

Removed

• None

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; test-only changes, no API impact

Testing & Reviewing

Run tests: npm test -- hasInteractiveNodes.test.ts

All 35 tests validate:

• Correct detection of interactive vs non-interactive elements
• Proper handling of visibility/disabled states
• ignoreNodes exclusion logic
• Optimized selector-based implementation matches expected behavior

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 761187d

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.