kovakmedya 671195fb7d feat(tasks): Kanban board with drag-and-drop (dnd-kit)
Replaces the template's /tasks demo (deleted) with a real multi-tenant
Kanban board.

Schema/validation:
- lib/validation/tasks.ts (taskSchema with status/priority enums + dueDate
  optional + assignee/customer optional)
- lib/appwrite/task-actions.ts: createTaskAction, updateTaskAction,
  deleteTaskAction, moveTaskAction (used by drag-drop). All audit-logged;
  moveTaskAction only audits when status actually changes.
- lib/appwrite/task-queries.ts: listTasks ordered by 'order' asc.

UI:
- /tasks server page assembles { tasks, customers, teamMembers } and
  passes to TasksBoard. Removed the template's data-table demo files.
- TasksBoard (client): 4 droppable columns. Columns use @dnd-kit/core
  useDroppable; cards inside each column are SortableContext+useSortable
  for intra-column ordering. closestCorners collision detection.
- Drag-end computes new 'order' as midpoint between adjacent tasks
  (no full reindex), updates UI optimistically, then persists via
  moveTaskAction. Rolls back on server error with toast.
- TaskCard: priority badge (color-coded), due-date badge (red if
  overdue), assignee badge, customer subtitle, dropdown (Edit/Delete)
  on hover.
- TaskFormSheet: title/description/status/priority/dueDate/assignee/
  customer. Uses sentinel '__none__' for nullable Selects (Radix Select
  forbids empty string values), stripped before submit.
- DragOverlay shows the dragged card rotated 3deg with shadow.
2026-04-30 05:57:35 +03:00
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