PostDetail now uses Artefacts exclusively for all 4 asset types:
- Caption copy = Artefact with type='copy', copy_type='caption'
- Body copy = Artefact with type='copy', copy_type='body'
- Design = Artefact with type='design'
- Video = Artefact with type='video'
Removed TranslationDetailPanel from PostDetail entirely.
Same ArtefactDetailPanel, same workflow, same version management
for all asset types. Link picker searches artefacts only.
Server: copy_type added to Artefacts schema, accepted in POST/PATCH.
post-composition.js rewritten to use Artefacts table for all pieces.
Content preview fetched from ArtefactVersionTexts.
Translations entity still exists for the standalone Copy page.
Also: version creation rules, submit-review content validation,
reviewer mandatory for translations, artefact creation simplified.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
