- Tags: create/edit/delete tags with color picker modal, assign to tasks
- Sort: sort tasks by position, priority, due date, title, created date
- Filters: filter by status, priority, due date, tag
- Recurrence: daily/weekly/monthly/yearly with auto-creation on completion
- Fix removeTagFromTask bug (was deleting all tags instead of specific one)
- Tag editor redesigned as modal for better keyboard UX
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>