fix: preserve valid make-child targets during drop redirection

[tensor2077]

Fixes #0

@lukasbach

with.bug.mov

fixed.mov

getDragTarget redirects away from a valid MakeChild target when the parent target is invalid and canReorder is false

getDragTarget seems to discard a valid MakeChild target in this case:

• the hovered item itself is a valid MakeChild target
• its parent is not a valid drop target
• canReorder is false

Expected: the current item should remain the final drop target.

Actual: getDragTarget recurses to the parent first, so the valid child target is lost and the drop never stabilizes on the current item.

The problematic branch seems to be the !canReorder && parent && !canBecomeSibling recursion running before the PlacementType.MakeChild return.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1937844

The changes in this PR will be included in the next version bump.

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Name	Type
@headless-tree/core	Patch
@headless-tree/react	Patch
@headless-tree/sb-react	Patch

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