Extract shared setupAutocomplete() into shared.js so all three autocomplete instances (mappings modal, inline add, quick-map modal) get keyboard nav (ArrowDown/Up/Enter/Escape), scroll-safe blur handling, and capture-phase keydown to prevent browser interception. Remove old onmousedown inline handlers, use data-codmat/data-label attributes instead. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>