Finish the Drag and Drop Workflow

Test drag and drop together with the features you already built.

Check these cases:

1. Drag an active task to another position.
2. Drag a completed task.
3. Drag a task while a filter is active.
4. Search for a task and confirm the list still behaves normally.
5. Reorder tasks, refresh the page, and verify the saved order.
6. Edit or delete a task after reordering.

If a filtered or searched view makes the target position ambiguous, keep the implementation focused on the currently rendered task rows rather than introducing a second ordering system.

Checkpoint

The task list should now support drag-and-drop ordering without breaking adding, editing, completing, deleting, filtering, searching, or persistence.