Clicking an artifact in a chat room's library now opens an artifact
detail screen instead of the placeholder route.
- New ArtifactDetailRoute + ArtifactDetailScreen/ViewModel/UIState. The
screen shows the artifact's details (name, url, visibility, license,
dialect, author, created), its versions, and — walked via the artifact's
versions — the associated chapters and translations, each with an empty
state.
- DAO queries (validated by Room): getArtifactById, versions by artifactId,
chapters by artifactId (Chapter JOIN ArtifactVersion, ordered by index),
and translations by artifactId (TranslationArtifactVersion JOIN
ArtifactVersion). Exposed via MantraRepository (impl + NO_OP).
- ChatRoomDetailScreen navigates to ArtifactDetailRoute on artifact click;
MantraNavHost registers the route with a back-stack pop.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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