- Add public/components/modal.js with focus-trap, escape-handler,
overlay-click, focus-restore, scroll-lock, aria-modal (Spec §5.1/§5.2)
- Migrate tasks.js from custom modal to shared openModal/closeModal API
- Remove .modal-backdrop/.modal/.modal__* styles from tasks.css
- Add .modal-panel--sm/--lg sizing variants to layout.css
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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