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/pages/Setup.tsx

@@ -278,7 +278,7 @@ export default function Setup() {
             Configuration
           </button>
           <button
-            onClick={() => setActiveTab('canvas')}
+            onClick={() => navigate(`/canvas/${selectedStudy?.id || ''}`)}
             className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-primary-600 text-white"
           >
             <Grid3X3 className="w-4 h-4" />
@@ -333,7 +333,7 @@ export default function Setup() {
           Configuration
         </button>
         <button
-          onClick={() => setActiveTab('canvas')}
+          onClick={() => navigate(`/canvas/${selectedStudy?.id || ''}`)}
           className="flex items-center gap-2 px-4 py-2 rounded-lg transition-colors bg-dark-800 text-dark-300 hover:text-white hover:bg-dark-700"
         >
           <Grid3X3 className="w-4 h-4" />