feat(dashboard): Enhanced chat, spec management, and Claude integration

Backend:
- spec.py: New AtomizerSpec REST API endpoints
- spec_manager.py: SpecManager service for unified config
- interview_engine.py: Study creation interview logic
- claude.py: Enhanced Claude API with context
- optimization.py: Extended optimization endpoints
- context_builder.py, session_manager.py: Improved services

Frontend:
- Chat components: Enhanced message rendering, tool call cards
- Hooks: useClaudeCode, useSpecWebSocket, improved useChat
- Pages: Updated Dashboard, Analysis, Insights, Setup, Home
- Components: ParallelCoordinatesPlot, ParetoPlot improvements
- App.tsx: Route updates for canvas/studio

Infrastructure:
- vite.config.ts: Build configuration updates
- start/stop-dashboard.bat: Script improvements

atomizer-dashboard/frontend/src/hooks/useWebSocket.ts

@@ -18,7 +18,8 @@ export const useOptimizationWebSocket = ({ studyId, onMessage }: UseOptimization
       const host = window.location.host; // This will be localhost:3000 in dev
       // If using proxy in vite.config.ts, this works. 
       // If not, we might need to hardcode backend URL for dev:
-      const backendHost = import.meta.env.DEV ? 'localhost:8000' : host;
+      // Use port 8001 to match start-dashboard.bat
+      const backendHost = import.meta.env.DEV ? 'localhost:8001' : host;
       
       setSocketUrl(`${protocol}//${backendHost}/api/ws/optimization/${studyId}`);
     } else {