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// UI interaction checklist: // [x] Debounce typeahead: 300ms after last keypress // [x] IntersectionObserver for scroll-triggered effects // [x] Event delegation for dynamically added elements // [x] aria-expanded on toggle triggers // [x] Escape key closes all overlays/modals // [x] Focus management: return focus after dialog closes // [x] Mobile touch events alongside click events // [x] processData/contentType false for FormData uploads
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