feat: implement drag-and-drop functionality in ObjectivesBoard

- Added DnD context and handlers for task reordering and status updates.
- Introduced DroppableColumn component for better task organization by status.
- Enhanced task card interaction with visual feedback during drag events.
- Updated KanbanBoardContainer to support new status update prop.

components/kanban/BoardContainer.tsx

@@ -91,6 +91,7 @@ export function KanbanBoardContainer({
           onDeleteTask={deleteTask}
           onEditTask={handleEditTask}
           onUpdateTitle={handleUpdateTitle}
+          onUpdateStatus={handleUpdateStatus}
           compactView={kanbanFilters.compactView}
           pinnedTagName={pinnedTagName}
         />