feat(search): honest has-preview for audio in search results

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Add a preview facet to the search message entity carrying the embedded preview
dimensions, mapped from the index in both engines. The webdav search report now
derives oc:has-preview via thumbnail.HasPreviewForMimeType: unconditional types
stay true, embedded-preview types (audio) are true only when a cover was
indexed, instead of the blanket mimetype match that reported a preview for every
audio file.

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