- Add SortDirection type and SortConfig interface to noteListHelpers
- getSortComparator now accepts optional direction parameter
- SortDropdown shows ↑/↓ arrow buttons per option in the menu
- Button label shows current direction arrow (ArrowUp/ArrowDown)
- Persistence updated to store {option, direction} with backward compat
for old string-only preferences
- Default directions: modified/created=desc, title/status=asc
- Status sort tiebreaker always uses newest-first regardless of direction
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>