Transfer List (Move Selected Items Between Two Lists)

Challenge summary

This UI should keep item order stable, clear selection after transfer, and avoid no-op actions when nothing is selected. Vue focus: manage selection with reactive arrays and computed helpers.

What you'll practice

• Render two lists: Top and Bottom.
• Each row must have a checkbox to select the item.
• Provide two buttons between the lists: ↓ moves selected Top items to Bottom, ↑ moves selected Bottom items to Top.
• After moving, clear the selection of the moved-from list.
• Top and Bottom lists render initial items.

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