Absolutely huge update:
New Kanban view:
- Added a full Kanban mode to /workflow with a List/Kanban toggle, shown only when a single Kanban-compatible workflow is in scope.
- Introduced explicit Kanban compatibility validation (including deterministic one-edge mapping) and surfaced compatibility status in workflow admin.
- Made workflow items actionable from Kanban: drag/drop between legal steps, keyboard step moves with arrow keys, and click-through to open topics.
- Improved reliability for concurrent updates: stale transitions now return 409, shows a clear stale-state message, and triggers refresh to re-sync UI state.
- Board usability and clarity: optional workflow-level Kanban tags, overdue indicator support on cards, and lane styling including category-colored column borders.