The Cultures page already lets you select multiple plates to archive or unarchive in bulk — now you can reassign ownership the same way. Select any number of plates in multi-select mode, choose "Set owner" from the action bar, and apply one owner (or clear the current owner) across all selected plates at once. This replaces a workflow that previously required opening each plate's sidebar and updating it individually — a real friction point when handing off a full experiment.
