Closes bd-3ny. Added mousedown listener that dismisses the dropdown when clicking outside both the dropdown and textarea. Uses early return to avoid registering listeners when dropdown is already closed.
Planning documents for future AMC features: PLAN-slash-autocomplete.md: - Slash-command autocomplete for SimpleInput - Skills API endpoint, SlashMenu dropdown, keyboard navigation - 8 implementation steps with file locations and dependencies plans/agent-spawning.md: - Agent spawning acceptance criteria documentation - Spawn command integration, status tracking, error handling - Written as testable acceptance criteria (AC-1 through AC-10) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
