Shared media captions

MediaCaptionEditor.tsx edits the selected content language and reviews a bounded AI proposal. Image, language, content and request changes discard stale responses. The native product, page or app editor owns saving, revision and publication.
caption-i18n.ts contains EN/DE/FR/ES interface copy; enabled content locales come from ContentLanguage.
captions.css fits existing media inspectors without a second workspace or AI conversation owner.

Captions are visible text, separate from accessibility alt text. merchant.media.caption uses central inference, current assistant permission and enabled shop locales. Context-only proposals are explicitly labelled. No generation call saves or publishes content.

product-media.ts owns the shared typed image/model distinction and scoped model URLs. ModelViewer.tsx loads the pinned viewer on demand, with localized controls and error recovery. model-decoder-disabled.ts excludes an unused WebAssembly decoder; native admission requires uncompressed embedded GLB. model-i18n.ts owns interface and accessibility strings.