The Library section hardcoded "No artifacts exists". Load and render the
chat room's stored artifacts instead.
- MantraArtifactDao.getArtifactsByChatRoomId + MantraRepository.getArtifacts
expose a chat room's artifacts (newest first).
- ChatRoomDetailUIState.Loaded carries artifacts; ChatRoomDetailViewModel
gains mantraRepository and loads them in initiateChatRoomDetail.
- ChatRoomDetailScreen renders the empty-state text only when there are no
artifacts, otherwise a Card/ListItem per artifact (name, url, chevron to a
pending detail route). The screen takes mantraRepository, threaded through
the factory, the nav host (databaseMantraRepository), and the preview.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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