- Add triggerInfo state and filteredSkills useMemo
- Add showAutocomplete, selectedIndex state management
- Implement insertSkill callback for skill insertion
- Add full keyboard navigation (ArrowUp/Down, Enter/Tab, Escape)
- Wrap textarea in relative container for dropdown positioning
- Add autocomplete dropdown UI with empty states and mouse interaction
Closes: bd-29o, bd-1y3, bd-3vd, bd-2uj, bd-3us, bd-253
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>