feat(canvas): Add Phase 3+4 - Bidirectional sync, templates, and visual polish

Phase 3 - Bidirectional Sync:
- Add loadFromIntent and loadFromConfig to canvas store
- Create useIntentParser hook for parsing Claude messages
- Create ConfigImporter component (file upload, paste JSON, load study)
- Add import/clear buttons to CanvasView header

Phase 4 - Templates & Polish:
- Create template library with 5 presets:
  - Mass Minimization (single-objective)
  - Multi-Objective Pareto (NSGA-II)
  - Turbo Mode (with MLP surrogate)
  - Mirror Zernike (optical optimization)
  - Frequency Optimization (modal)
- Create TemplateSelector component with category filters
- Enhanced BaseNode with animations, glow effects, status indicators
- Add colorBg to all node types for visual distinction
- Add notification toast system
- Update all exports

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

atomizer-dashboard/frontend/src/components/canvas/nodes/SolverNode.tsx

@@ -6,7 +6,7 @@ import { SolverNodeData } from '../../../lib/canvas/schema';
 function SolverNodeComponent(props: NodeProps<SolverNodeData>) {
   const { data } = props;
   return (
-    <BaseNode {...props} icon={<span>⚙️</span>} color="text-purple-600">
+    <BaseNode {...props} icon={<span>⚙️</span>} color="text-purple-600" colorBg="bg-purple-50">
       {data.solverType && <div>{data.solverType}</div>}
     </BaseNode>
   );