- add a `status` field to tasks (backend schema/validation/service/types
+ frontend types), kept in sync with the legacy `done` flag
- migration 0017 adds the column and backfills done tasks to "done"
- rewrite the tasks page as a three-column board: per-column add buttons,
draggable cards, and a status mover in the detail sheet
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Khalid Abdi