Analytics page now shows skeleton loaders (cards and chart placeholders)
while data loads, and displays a retry button when the API call fails.
Batch page error state now shows the actual error message and suggests
user action.
Closesleeworks-agents/SPARC#16
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add modern React frontend to replace Streamlit dashboard:
- Vite build system with TypeScript
- Tailwind CSS for styling
- Component structure in src/
- Production Dockerfile with nginx
- Development server on port 5173
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Co-Authored-By: Claude <noreply@anthropic.com>