feat(kanban): dashboard batch QOL upgrade
- Shift-click range selection, column select-all, select-all-visible
- Multi-card drag/drop via selectedIds + /tasks/bulk
- Expanded bulk actions: todo/ready/blocked/unblock/complete/archive,
priority setter, reassign with reclaim_first checkbox
- Partial failure card highlight (failedIds + hermes-kanban-card--failed)
- Search expanded to body, result, latest_summary, summary
- Clear filters button + reset all filters on board switch
- Accessibility: larger checkbox hit target, tabIndex/role/aria-label,
Enter/Space/Esc keyboard handlers
- Fix temporal-dead-zone bug: move clearSelected before moveSelected
0ea234e093