implement short-term generative UI improvements:
- Add StreamingState type ("started" | "streaming" | "done") to ComponentContext
- Add loadingComponent field to catalog for Card, StatCard, DataTable, SchedulePreview
- Create skeleton components (CardSkeleton, StatCardSkeleton, etc.) with animate-pulse
- Add PropSkeleton component for different prop types (text, badge, table-row, etc.)
- Add useStreamingProps/useStreamingProp hooks to track prop arrival during streaming
- Add ComponentLoadingWrapper for prop-level skeleton display (opt-in via enablePropSkeletons)
- Fix JSON parse errors in API routes when request body is incomplete
Co-authored-by: Nicholai <nicholaivogelfilms@gmail.com>
Nicholai
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