- New SlideMediaElementBuilder converts FOREGROUND (uploaded) image media
actions into slide-content fill.media elements placed at the top of the
slide content, so uploaded information/moderation/sermon images render as
real content rather than a media-layer action.
- Service background and key-visual images remain BACKGROUND media actions on
the bottom layer; song text and name-tag stay text content elements.
- Wire the builder into ProExportService and ProBundleExportService (after
generate) and split PlaylistExportService::writeProFile into
generate -> inject -> write via ProFileWriter so the playlist path applies
the same rule.
- Parser library unchanged.
- Migrate export tests to the combined rule via a shared InspectsSlideFillMedia
support trait and add SlideMediaElementTest.
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