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Implements focus trap function that cycles Tab/Shift+Tab within modal boundaries,
adds ARIA attributes (role, aria-modal, aria-labelledby) for accessibility
compliance, and integrates focus initialization on modal display.
- Focus trap prevents tab escape from modal dialog
- ARIA attributes: role=dialog, aria-modal=true, aria-labelledby linking title
- Backdrop marked aria-hidden=true to exclude from accessibility tree
- Close buttons have aria-label for screen readers
- Focus initialization calls createFocusTrap on modal show
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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