NVDA+Chrome <2022 and VoiceOver iOS <16 need explicit aria-modal="true"; showModal() implicit modal semantics are not enough for older AT. One-line patch benefits all dialog uses. Refs #781 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>