UX: fix reviewable select-kit covered by the next review-item

The review-item lacks proper z-index, and the select-kit is stacked using natural DOM order, when the former select-kit appears on the latter review-item, it will become transparent and unclickable.

This commit fix this by adding proper z-index to components.

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Also, it seems these two PR are stale, please take time to look them up.

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