CultInspectorAssetPathAttribute stored an engine asset path, which breaks
when the asset moves. CultInspectorAssetGuidAttribute stores the asset's
stable identity (in Unity, the .meta GUID) instead. The Studio drawer now
resolves the stored GUID to a path only to load the preview object, and
writes back AssetPathToGUID on a change. No path form survives for the
next field to pick up.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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