# Ralph Loop: Canvas Professional Upgrade V2

**Purpose:** Complete Canvas overhaul with Claude integration, auto-loading, and professional UI
**Execution:** Autonomous, all phases sequential, no stopping

---

## Launch Command

```powershell
cd C:\Users\antoi\Atomizer
claude --dangerously-skip-permissions
```

Paste everything below the line.

---

You are executing a **multi-phase autonomous development session** to upgrade the Atomizer Canvas to production quality.

## Mission Summary

Transform the Canvas from a prototype into a fully functional optimization workflow builder with:
1. Professional Lucide icons (no emojis)
2. Working Claude CLI integration
3. Auto-load from optimization_config.json
4. NX model introspection (.sim → expressions)
5. Expression search/dropdown for design variables
6. Responsive full-screen canvas
7. "Process with Claude" button using Atomizer protocols
8. Complete MCP tool implementation

## Environment

```
Working Directory: C:/Users/antoi/Atomizer
Frontend: atomizer-dashboard/frontend/
Backend: atomizer-dashboard/backend/
MCP Server: mcp-server/atomizer-tools/
Python: C:/Users/antoi/anaconda3/envs/atomizer/python.exe
Node: Available in PATH
Git: Push to origin AND github
```

## Execution Rules

1. **TodoWrite** - Track every task, mark complete immediately
2. **Sequential phases** - Complete each phase fully before next
3. **Test builds** - Run `npm run build` after each phase
4. **No questions** - Use provided code, make reasonable decisions
5. **Commit per phase** - Git commit after each major phase

---

# PHASE 1: Professional Icons (Replace All Emojis)

Replace ALL emoji icons with Lucide React icons across the Canvas.

## T1.1 - Update NodePalette.tsx

**File:** `atomizer-dashboard/frontend/src/components/canvas/palette/NodePalette.tsx`

```tsx
import { DragEvent } from 'react';
import { NodeType } from '../../../lib/canvas/schema';
import {
  Cube,
  Cpu,
  SlidersHorizontal,
  FlaskConical,
  Target,
  ShieldAlert,
  BrainCircuit,
  Rocket,
} from 'lucide-react';

interface PaletteItem {
  type: NodeType;
  label: string;
  icon: React.ReactNode;
  description: string;
  color: string;
}

const PALETTE_ITEMS: PaletteItem[] = [
  { type: 'model', label: 'Model', icon: <Cube size={18} />, description: 'NX model file (.prt, .sim)', color: 'text-blue-400' },
  { type: 'solver', label: 'Solver', icon: <Cpu size={18} />, description: 'Nastran solution type', color: 'text-violet-400' },
  { type: 'designVar', label: 'Design Variable', icon: <SlidersHorizontal size={18} />, description: 'Parameter to optimize', color: 'text-emerald-400' },
  { type: 'extractor', label: 'Extractor', icon: <FlaskConical size={18} />, description: 'Physics result extraction', color: 'text-cyan-400' },
  { type: 'objective', label: 'Objective', icon: <Target size={18} />, description: 'Optimization goal', color: 'text-rose-400' },
  { type: 'constraint', label: 'Constraint', icon: <ShieldAlert size={18} />, description: 'Design constraint', color: 'text-amber-400' },
  { type: 'algorithm', label: 'Algorithm', icon: <BrainCircuit size={18} />, description: 'Optimization method', color: 'text-indigo-400' },
  { type: 'surrogate', label: 'Surrogate', icon: <Rocket size={18} />, description: 'Neural acceleration', color: 'text-pink-400' },
];

export function NodePalette() {
  const onDragStart = (event: DragEvent, nodeType: NodeType) => {
    event.dataTransfer.setData('application/reactflow', nodeType);
    event.dataTransfer.effectAllowed = 'move';
  };

  return (
    <div className="w-56 bg-dark-850 border-r border-dark-700 flex flex-col">
      <div className="p-4 border-b border-dark-700">
        <h3 className="text-xs font-semibold text-dark-400 uppercase tracking-wider">
          Components
        </h3>
        <p className="text-xs text-dark-500 mt-1">
          Drag to canvas
        </p>
      </div>
      <div className="flex-1 overflow-y-auto p-3 space-y-1.5">
        {PALETTE_ITEMS.map((item) => (
          <div
            key={item.type}
            draggable
            onDragStart={(e) => onDragStart(e, item.type)}
            className="flex items-center gap-2.5 px-3 py-2.5 bg-dark-800/50 rounded-lg border border-dark-700/50
                       cursor-grab hover:border-primary-500/50 hover:bg-dark-800
                       active:cursor-grabbing transition-all group"
          >
            <div className={`${item.color} opacity-80 group-hover:opacity-100 transition-opacity`}>
              {item.icon}
            </div>
            <div className="flex-1 min-w-0">
              <div className="font-medium text-dark-200 text-sm leading-tight">{item.label}</div>
              <div className="text-[10px] text-dark-500 truncate">{item.description}</div>
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}
```

## T1.2 - Update BaseNode.tsx with Lucide Icons

**File:** `atomizer-dashboard/frontend/src/components/canvas/nodes/BaseNode.tsx`

```tsx
import { memo, ReactNode } from 'react';
import { Handle, Position, NodeProps } from 'reactflow';
import { AlertCircle } from 'lucide-react';
import { BaseNodeData } from '../../../lib/canvas/schema';

interface BaseNodeProps extends NodeProps<BaseNodeData> {
  icon: ReactNode;
  iconColor: string;
  children?: ReactNode;
  inputs?: number;
  outputs?: number;
}

function BaseNodeComponent({
  data,
  selected,
  icon,
  iconColor,
  children,
  inputs = 1,
  outputs = 1,
}: BaseNodeProps) {
  const hasErrors = data.errors && data.errors.length > 0;

  return (
    <div
      className={`
        relative px-3 py-2.5 rounded-lg border min-w-[160px] max-w-[200px]
        bg-dark-850 shadow-lg transition-all duration-150
        ${selected ? 'border-primary-400 ring-2 ring-primary-400/20' : 'border-dark-600'}
        ${!data.configured ? 'border-dashed border-dark-500' : ''}
        ${hasErrors ? 'border-red-500/70' : ''}
      `}
    >
      {inputs > 0 && (
        <Handle
          type="target"
          position={Position.Left}
          className="!w-2.5 !h-2.5 !bg-dark-500 !border-2 !border-dark-700 hover:!bg-primary-400 hover:!border-primary-500 transition-colors"
        />
      )}

      <div className="flex items-center gap-2">
        <div className={`${iconColor} flex-shrink-0`}>
          {icon}
        </div>
        <div className="flex-1 min-w-0">
          <div className="font-medium text-white text-sm truncate">{data.label}</div>
        </div>
        {!data.configured && (
          <div className="w-1.5 h-1.5 rounded-full bg-amber-400 flex-shrink-0" />
        )}
      </div>

      {children && (
        <div className="mt-1.5 text-xs text-dark-400 truncate">
          {children}
        </div>
      )}

      {hasErrors && (
        <div className="mt-1.5 flex items-center gap-1 text-xs text-red-400">
          <AlertCircle size={10} />
          <span className="truncate">{data.errors![0]}</span>
        </div>
      )}

      {outputs > 0 && (
        <Handle
          type="source"
          position={Position.Right}
          className="!w-2.5 !h-2.5 !bg-dark-500 !border-2 !border-dark-700 hover:!bg-primary-400 hover:!border-primary-500 transition-colors"
        />
      )}
    </div>
  );
}

export const BaseNode = memo(BaseNodeComponent);
```

## T1.3 - Update All Node Components

Update each node file to use Lucide icons:

**ModelNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { Cube } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { ModelNodeData } from '../../../lib/canvas/schema';

function ModelNodeComponent(props: NodeProps<ModelNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<Cube size={16} />} iconColor="text-blue-400" inputs={0}>
      {data.filePath ? data.filePath.split(/[/\\]/).pop() : 'No file selected'}
    </BaseNode>
  );
}
export const ModelNode = memo(ModelNodeComponent);
```

**SolverNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { Cpu } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { SolverNodeData } from '../../../lib/canvas/schema';

function SolverNodeComponent(props: NodeProps<SolverNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<Cpu size={16} />} iconColor="text-violet-400">
      {data.solverType || 'Select solution'}
    </BaseNode>
  );
}
export const SolverNode = memo(SolverNodeComponent);
```

**DesignVarNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { SlidersHorizontal } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { DesignVarNodeData } from '../../../lib/canvas/schema';

function DesignVarNodeComponent(props: NodeProps<DesignVarNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<SlidersHorizontal size={16} />} iconColor="text-emerald-400">
      {data.expressionName ? (
        <span className="font-mono">{data.expressionName}</span>
      ) : (
        'Select expression'
      )}
    </BaseNode>
  );
}
export const DesignVarNode = memo(DesignVarNodeComponent);
```

**ExtractorNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { FlaskConical } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { ExtractorNodeData } from '../../../lib/canvas/schema';

function ExtractorNodeComponent(props: NodeProps<ExtractorNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<FlaskConical size={16} />} iconColor="text-cyan-400">
      {data.extractorName || 'Select extractor'}
    </BaseNode>
  );
}
export const ExtractorNode = memo(ExtractorNodeComponent);
```

**ObjectiveNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { Target } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { ObjectiveNodeData } from '../../../lib/canvas/schema';

function ObjectiveNodeComponent(props: NodeProps<ObjectiveNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<Target size={16} />} iconColor="text-rose-400">
      {data.name ? `${data.direction === 'maximize' ? '↑' : '↓'} ${data.name}` : 'Set objective'}
    </BaseNode>
  );
}
export const ObjectiveNode = memo(ObjectiveNodeComponent);
```

**ConstraintNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { ShieldAlert } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { ConstraintNodeData } from '../../../lib/canvas/schema';

function ConstraintNodeComponent(props: NodeProps<ConstraintNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<ShieldAlert size={16} />} iconColor="text-amber-400">
      {data.name && data.operator && data.value !== undefined
        ? `${data.name} ${data.operator} ${data.value}`
        : 'Set constraint'}
    </BaseNode>
  );
}
export const ConstraintNode = memo(ConstraintNodeComponent);
```

**AlgorithmNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { BrainCircuit } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { AlgorithmNodeData } from '../../../lib/canvas/schema';

function AlgorithmNodeComponent(props: NodeProps<AlgorithmNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<BrainCircuit size={16} />} iconColor="text-indigo-400">
      {data.method ? `${data.method} (${data.maxTrials || 100} trials)` : 'Select method'}
    </BaseNode>
  );
}
export const AlgorithmNode = memo(AlgorithmNodeComponent);
```

**SurrogateNode.tsx:**
```tsx
import { memo } from 'react';
import { NodeProps } from 'reactflow';
import { Rocket } from 'lucide-react';
import { BaseNode } from './BaseNode';
import { SurrogateNodeData } from '../../../lib/canvas/schema';

function SurrogateNodeComponent(props: NodeProps<SurrogateNodeData>) {
  const { data } = props;
  return (
    <BaseNode {...props} icon={<Rocket size={16} />} iconColor="text-pink-400" outputs={0}>
      {data.enabled ? (data.modelType || 'Auto') : 'Disabled'}
    </BaseNode>
  );
}
export const SurrogateNode = memo(SurrogateNodeComponent);
```

## T1.4 - Update templates.ts with Lucide Icons

**File:** `atomizer-dashboard/frontend/src/lib/canvas/templates.ts`

Replace emoji icons with Lucide icon names (strings for serialization):

```tsx
export interface CanvasTemplate {
  id: string;
  name: string;
  description: string;
  category: 'structural' | 'thermal' | 'optical' | 'general';
  icon: string; // Lucide icon name
  complexity: 'simple' | 'medium' | 'advanced';
  nodes: number;
  intent: Partial<OptimizationIntent>;
}

export const CANVAS_TEMPLATES: CanvasTemplate[] = [
  {
    id: 'mass-minimization',
    name: 'Mass Minimization',
    description: 'Single-objective mass reduction with stress constraint',
    category: 'structural',
    icon: 'Scale',
    complexity: 'simple',
    nodes: 6,
    intent: {
      // ... keep existing intent
    },
  },
  {
    id: 'multi-objective',
    name: 'Multi-Objective',
    description: 'Pareto optimization with mass and displacement',
    category: 'structural',
    icon: 'GitBranch',
    complexity: 'medium',
    nodes: 7,
    intent: {
      // ... keep existing intent
    },
  },
  {
    id: 'turbo-optimization',
    name: 'Turbo Mode',
    description: 'Neural-accelerated optimization with surrogate',
    category: 'general',
    icon: 'Zap',
    complexity: 'advanced',
    nodes: 8,
    intent: {
      // ... keep existing intent
    },
  },
  {
    id: 'mirror-zernike',
    name: 'Mirror WFE',
    description: 'Zernike wavefront error optimization for optics',
    category: 'optical',
    icon: 'CircleDot',
    complexity: 'advanced',
    nodes: 7,
    intent: {
      // ... keep existing intent
    },
  },
  {
    id: 'frequency-optimization',
    name: 'Frequency Target',
    description: 'Natural frequency optimization with modal analysis',
    category: 'structural',
    icon: 'Activity',
    complexity: 'medium',
    nodes: 6,
    intent: {
      // ... keep existing intent
    },
  },
];
```

---

# PHASE 2: Responsive Full-Screen Canvas

Make the canvas properly responsive and full-screen.

## T2.1 - Update AtomizerCanvas.tsx for Full Screen

**File:** `atomizer-dashboard/frontend/src/components/canvas/AtomizerCanvas.tsx`

```tsx
import { useCallback, useRef, DragEvent, useState, useEffect } from 'react';
import ReactFlow, {
  Background,
  Controls,
  MiniMap,
  ReactFlowProvider,
  ReactFlowInstance,
  BackgroundVariant,
} from 'reactflow';
import 'reactflow/dist/style.css';

import { nodeTypes } from './nodes';
import { NodePalette } from './palette/NodePalette';
import { NodeConfigPanel } from './panels/NodeConfigPanel';
import { ValidationPanel } from './panels/ValidationPanel';
import { ChatPanel } from './panels/ChatPanel';
import { useCanvasStore } from '../../hooks/useCanvasStore';
import { useCanvasChat } from '../../hooks/useCanvasChat';
import { NodeType } from '../../lib/canvas/schema';
import {
  CheckCircle,
  Wand2,
  Play,
  MessageSquare,
  X,
  Loader2,
} from 'lucide-react';

function CanvasFlow() {
  const reactFlowWrapper = useRef<HTMLDivElement>(null);
  const reactFlowInstance = useRef<ReactFlowInstance | null>(null);
  const [showChat, setShowChat] = useState(false);
  const [showValidation, setShowValidation] = useState(false);
  const [isProcessing, setIsProcessing] = useState(false);

  const {
    nodes,
    edges,
    selectedNode,
    onNodesChange,
    onEdgesChange,
    onConnect,
    addNode,
    selectNode,
    validation,
    validate,
    toIntent,
    clear,
  } = useCanvasStore();

  const { processWithClaude, isConnected, isThinking } = useCanvasChat();

  const onDragOver = useCallback((event: DragEvent) => {
    event.preventDefault();
    event.dataTransfer.dropEffect = 'move';
  }, []);

  const onDrop = useCallback(
    (event: DragEvent) => {
      event.preventDefault();
      const type = event.dataTransfer.getData('application/reactflow') as NodeType;
      if (!type || !reactFlowInstance.current || !reactFlowWrapper.current) return;

      const bounds = reactFlowWrapper.current.getBoundingClientRect();
      const position = reactFlowInstance.current.screenToFlowPosition({
        x: event.clientX - bounds.left,
        y: event.clientY - bounds.top,
      });
      addNode(type, position);
    },
    [addNode]
  );

  const onNodeClick = useCallback(
    (_: React.MouseEvent, node: { id: string }) => {
      selectNode(node.id);
      setShowChat(false);
    },
    [selectNode]
  );

  const onPaneClick = useCallback(() => {
    selectNode(null);
  }, [selectNode]);

  const handleValidate = useCallback(() => {
    const result = validate();
    setShowValidation(true);
    setTimeout(() => setShowValidation(false), 5000);
    return result;
  }, [validate]);

  const handleProcess = useCallback(async () => {
    const result = validate();
    if (!result.valid) {
      setShowValidation(true);
      return;
    }
    setIsProcessing(true);
    setShowChat(true);
    try {
      const intent = toIntent();
      await processWithClaude(intent);
    } finally {
      setIsProcessing(false);
    }
  }, [validate, toIntent, processWithClaude]);

  return (
    <div className="flex h-full w-full bg-dark-900">
      {/* Left: Node Palette */}
      <NodePalette />

      {/* Center: Canvas - Takes remaining space */}
      <div className="flex-1 flex flex-col min-w-0">
        {/* Canvas Area */}
        <div className="flex-1 relative" ref={reactFlowWrapper}>
          <ReactFlow
            nodes={nodes}
            edges={edges}
            onNodesChange={onNodesChange}
            onEdgesChange={onEdgesChange}
            onConnect={onConnect}
            onInit={(instance) => { reactFlowInstance.current = instance; }}
            onDragOver={onDragOver}
            onDrop={onDrop}
            onNodeClick={onNodeClick}
            onPaneClick={onPaneClick}
            nodeTypes={nodeTypes}
            fitView
            fitViewOptions={{ padding: 0.2 }}
            minZoom={0.1}
            maxZoom={2}
            className="bg-dark-900"
            proOptions={{ hideAttribution: true }}
          >
            <Background
              variant={BackgroundVariant.Dots}
              gap={20}
              size={1}
              color="#1e293b"
            />
            <Controls
              className="!bg-dark-800 !border-dark-700 !rounded-lg !shadow-lg
                         [&>button]:!bg-dark-700 [&>button]:!border-dark-600
                         [&>button]:!text-dark-300 [&>button:hover]:!bg-dark-600
                         [&>button:hover]:!text-white"
              showInteractive={false}
            />
            <MiniMap
              className="!bg-dark-800/90 !border-dark-700 !rounded-lg"
              nodeColor={(n) => {
                if (n.selected) return '#00d4e6';
                return '#334155';
              }}
              maskColor="rgba(5, 10, 18, 0.85)"
              pannable
              zoomable
            />
          </ReactFlow>

          {/* Floating Action Buttons */}
          <div className="absolute bottom-4 right-4 flex items-center gap-2">
            <button
              onClick={() => setShowChat(!showChat)}
              className={`p-2.5 rounded-lg transition-all ${
                showChat
                  ? 'bg-primary-500 text-white'
                  : 'bg-dark-800 text-dark-300 hover:bg-dark-700 hover:text-white'
              } border border-dark-600`}
              title="Toggle Chat"
            >
              <MessageSquare size={18} />
            </button>
            <div className="w-px h-8 bg-dark-700" />
            <button
              onClick={handleValidate}
              className="flex items-center gap-2 px-3 py-2 bg-dark-800 text-dark-200
                         rounded-lg hover:bg-dark-700 hover:text-white transition-all
                         border border-dark-600"
            >
              <CheckCircle size={16} />
              <span className="text-sm font-medium">Validate</span>
            </button>
            <button
              onClick={handleProcess}
              disabled={isProcessing || nodes.length === 0}
              className={`flex items-center gap-2 px-4 py-2 rounded-lg transition-all
                         border font-medium text-sm ${
                isProcessing
                  ? 'bg-primary-600 text-white border-primary-500'
                  : nodes.length === 0
                  ? 'bg-dark-800 text-dark-500 border-dark-700 cursor-not-allowed'
                  : 'bg-primary-500 text-white border-primary-400 hover:bg-primary-600'
              }`}
            >
              {isProcessing ? (
                <>
                  <Loader2 size={16} className="animate-spin" />
                  <span>Processing...</span>
                </>
              ) : (
                <>
                  <Wand2 size={16} />
                  <span>Process with Claude</span>
                </>
              )}
            </button>
          </div>

          {/* Validation Toast */}
          {showValidation && (
            <div className="absolute top-4 left-1/2 -translate-x-1/2 z-50">
              <ValidationPanel
                validation={validation}
                onClose={() => setShowValidation(false)}
              />
            </div>
          )}
        </div>
      </div>

      {/* Right: Config Panel or Chat */}
      {(selectedNode || showChat) && (
        <div className="w-80 border-l border-dark-700 bg-dark-850 flex flex-col">
          {selectedNode && !showChat ? (
            <NodeConfigPanel nodeId={selectedNode} />
          ) : (
            <ChatPanel onClose={() => setShowChat(false)} />
          )}
        </div>
      )}
    </div>
  );
}

export function AtomizerCanvas() {
  return (
    <ReactFlowProvider>
      <CanvasFlow />
    </ReactFlowProvider>
  );
}
```

## T2.2 - Update CanvasView.tsx for Full Screen Layout

**File:** `atomizer-dashboard/frontend/src/pages/CanvasView.tsx`

```tsx
import { useState } from 'react';
import { AtomizerCanvas } from '../components/canvas/AtomizerCanvas';
import { TemplateSelector } from '../components/canvas/panels/TemplateSelector';
import { ConfigImporter } from '../components/canvas/panels/ConfigImporter';
import { useCanvasStore } from '../hooks/useCanvasStore';
import {
  LayoutTemplate,
  FileInput,
  Trash2,
  FolderOpen,
} from 'lucide-react';

export function CanvasView() {
  const [showTemplates, setShowTemplates] = useState(false);
  const [showImporter, setShowImporter] = useState(false);
  const { clear, nodes } = useCanvasStore();

  return (
    <div className="h-screen flex flex-col bg-dark-900">
      {/* Compact Header */}
      <header className="flex-shrink-0 h-12 bg-dark-850 border-b border-dark-700 px-4 flex items-center justify-between">
        <div className="flex items-center gap-3">
          <h1 className="text-sm font-semibold text-white">Canvas Builder</h1>
          <span className="text-xs text-dark-500">
            {nodes.length} node{nodes.length !== 1 ? 's' : ''}
          </span>
        </div>
        <div className="flex items-center gap-1.5">
          <button
            onClick={() => setShowTemplates(true)}
            className="flex items-center gap-1.5 px-2.5 py-1.5 text-xs font-medium
                       text-dark-300 hover:text-white hover:bg-dark-700 rounded transition-colors"
          >
            <LayoutTemplate size={14} />
            Templates
          </button>
          <button
            onClick={() => setShowImporter(true)}
            className="flex items-center gap-1.5 px-2.5 py-1.5 text-xs font-medium
                       text-dark-300 hover:text-white hover:bg-dark-700 rounded transition-colors"
          >
            <FileInput size={14} />
            Import
          </button>
          <div className="w-px h-4 bg-dark-700 mx-1" />
          <button
            onClick={clear}
            disabled={nodes.length === 0}
            className="flex items-center gap-1.5 px-2.5 py-1.5 text-xs font-medium
                       text-dark-400 hover:text-red-400 hover:bg-red-500/10 rounded
                       transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
          >
            <Trash2 size={14} />
            Clear
          </button>
        </div>
      </header>

      {/* Canvas - Takes all remaining space */}
      <main className="flex-1 min-h-0">
        <AtomizerCanvas />
      </main>

      {/* Modals */}
      {showTemplates && (
        <TemplateSelector onClose={() => setShowTemplates(false)} />
      )}
      {showImporter && (
        <ConfigImporter onClose={() => setShowImporter(false)} />
      )}
    </div>
  );
}
```

---

# PHASE 3: Auto-Load from Optimization Config

When a study is loaded, auto-populate the canvas from its optimization_config.json.

## T3.1 - Add Backend Endpoint for Study Config

**File:** `atomizer-dashboard/backend/api/routes/studies.py`

Add this endpoint (find the router and add):

```python
@router.get("/{study_path:path}/config")
async def get_study_config(study_path: str):
    """Load optimization_config.json from a study directory."""
    import json
    from pathlib import Path

    # Resolve study path
    studies_root = Path(__file__).parent.parent.parent.parent.parent / "studies"
    config_path = studies_root / study_path / "optimization_config.json"

    if not config_path.exists():
        # Try with 1_config subdirectory
        config_path = studies_root / study_path / "1_config" / "optimization_config.json"

    if not config_path.exists():
        raise HTTPException(status_code=404, detail=f"Config not found for study: {study_path}")

    try:
        with open(config_path, 'r') as f:
            config = json.load(f)
        return config
    except json.JSONDecodeError as e:
        raise HTTPException(status_code=400, detail=f"Invalid JSON: {str(e)}")
```

## T3.2 - Add Backend Endpoint to List Studies

```python
@router.get("/")
async def list_studies():
    """List all available studies with their status."""
    from pathlib import Path
    import json

    studies_root = Path(__file__).parent.parent.parent.parent.parent / "studies"
    studies = []

    for category in studies_root.iterdir():
        if not category.is_dir() or category.name.startswith('.'):
            continue
        for study_dir in category.iterdir():
            if not study_dir.is_dir():
                continue

            # Find config
            config_path = study_dir / "optimization_config.json"
            if not config_path.exists():
                config_path = study_dir / "1_config" / "optimization_config.json"

            # Find database
            db_path = study_dir / "3_results" / "study.db"
            if not db_path.exists():
                db_path = study_dir / "2_results" / "study.db"

            trial_count = 0
            if db_path.exists():
                try:
                    import sqlite3
                    conn = sqlite3.connect(str(db_path))
                    cursor = conn.execute("SELECT COUNT(*) FROM trials WHERE state = 'COMPLETE'")
                    trial_count = cursor.fetchone()[0]
                    conn.close()
                except:
                    pass

            studies.append({
                "path": f"{category.name}/{study_dir.name}",
                "name": study_dir.name,
                "category": category.name,
                "has_config": config_path.exists(),
                "trial_count": trial_count,
            })

    return {"studies": studies}
```

## T3.3 - Update useCanvasStore to Load from Config

**File:** `atomizer-dashboard/frontend/src/hooks/useCanvasStore.ts`

Add/update the `loadFromConfig` function:

```typescript
loadFromConfig: (config: OptimizationConfig) => {
  const nodes: Node<CanvasNodeData>[] = [];
  const edges: Edge[] = [];
  let nodeId = 0;
  const getId = () => `node_${++nodeId}`;

  // Layout positions
  const colX = [50, 250, 450, 650, 850];
  let row = 0;
  const getY = () => 50 + (row++) * 120;

  // Model node
  if (config.nx_model?.prt_path || config.nx_model?.sim_path) {
    const modelId = getId();
    nodes.push({
      id: modelId,
      type: 'model',
      position: { x: colX[0], y: 100 },
      data: {
        type: 'model',
        label: 'Model',
        configured: true,
        filePath: config.nx_model.sim_path || config.nx_model.prt_path,
        fileType: config.nx_model.sim_path ? 'sim' : 'prt',
      },
    });
  }

  // Solver node
  if (config.solver) {
    const solverId = getId();
    nodes.push({
      id: solverId,
      type: 'solver',
      position: { x: colX[1], y: 100 },
      data: {
        type: 'solver',
        label: 'Solver',
        configured: true,
        solverType: `SOL${config.solver.solution_type}`,
      },
    });
  }

  // Design variables
  row = 0;
  config.design_variables?.forEach((dv, i) => {
    const dvId = getId();
    nodes.push({
      id: dvId,
      type: 'designVar',
      position: { x: colX[0], y: 250 + i * 100 },
      data: {
        type: 'designVar',
        label: dv.name,
        configured: true,
        expressionName: dv.nx_expression || dv.name,
        minValue: dv.lower_bound,
        maxValue: dv.upper_bound,
        unit: dv.unit,
      },
    });
  });

  // Extractors from objectives
  const extractorIds: Record<string, string> = {};
  config.objectives?.forEach((obj, i) => {
    if (!extractorIds[obj.extractor_id]) {
      const extId = getId();
      extractorIds[obj.extractor_id] = extId;
      nodes.push({
        id: extId,
        type: 'extractor',
        position: { x: colX[2], y: 100 + i * 100 },
        data: {
          type: 'extractor',
          label: obj.extractor_id,
          configured: true,
          extractorId: obj.extractor_id,
          extractorName: obj.name,
        },
      });
    }
  });

  // Objectives
  config.objectives?.forEach((obj, i) => {
    const objId = getId();
    nodes.push({
      id: objId,
      type: 'objective',
      position: { x: colX[3], y: 100 + i * 100 },
      data: {
        type: 'objective',
        label: obj.name,
        configured: true,
        name: obj.name,
        direction: obj.direction,
        weight: obj.weight,
      },
    });

    // Connect extractor to objective
    if (extractorIds[obj.extractor_id]) {
      edges.push({
        id: `e_${extractorIds[obj.extractor_id]}_${objId}`,
        source: extractorIds[obj.extractor_id],
        target: objId,
      });
    }
  });

  // Constraints
  config.constraints?.forEach((con, i) => {
    const conId = getId();
    nodes.push({
      id: conId,
      type: 'constraint',
      position: { x: colX[3], y: 300 + i * 100 },
      data: {
        type: 'constraint',
        label: con.name,
        configured: true,
        name: con.name,
        operator: con.type === 'upper' ? '<=' : '>=',
        value: con.upper_bound ?? con.lower_bound,
      },
    });
  });

  // Algorithm
  if (config.optimization) {
    const algoId = getId();
    nodes.push({
      id: algoId,
      type: 'algorithm',
      position: { x: colX[4], y: 150 },
      data: {
        type: 'algorithm',
        label: 'Algorithm',
        configured: true,
        method: config.optimization.sampler || 'TPE',
        maxTrials: config.optimization.n_trials || 100,
      },
    });
  }

  // Surrogate
  if (config.surrogate?.enabled) {
    const surId = getId();
    nodes.push({
      id: surId,
      type: 'surrogate',
      position: { x: colX[4], y: 300 },
      data: {
        type: 'surrogate',
        label: 'Surrogate',
        configured: true,
        enabled: true,
        modelType: config.surrogate.type || 'MLP',
        minTrials: config.surrogate.min_trials || 20,
      },
    });
  }

  set({
    nodes,
    edges,
    selectedNode: null,
    validation: { valid: false, errors: [], warnings: [] },
  });
  nodeIdCounter = nodeId;
},
```

## T3.4 - Update ConfigImporter with Study Browser

**File:** `atomizer-dashboard/frontend/src/components/canvas/panels/ConfigImporter.tsx`

```tsx
import { useState, useEffect } from 'react';
import { useCanvasStore } from '../../../hooks/useCanvasStore';
import {
  X,
  Upload,
  FileCode,
  FolderOpen,
  Search,
  Check,
  Loader2,
  AlertCircle,
} from 'lucide-react';

interface Study {
  path: string;
  name: string;
  category: string;
  has_config: boolean;
  trial_count: number;
}

interface ConfigImporterProps {
  onClose: () => void;
}

export function ConfigImporter({ onClose }: ConfigImporterProps) {
  const [activeTab, setActiveTab] = useState<'file' | 'paste' | 'study'>('study');
  const [jsonInput, setJsonInput] = useState('');
  const [studies, setStudies] = useState<Study[]>([]);
  const [searchQuery, setSearchQuery] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [selectedStudy, setSelectedStudy] = useState<string | null>(null);

  const { loadFromConfig } = useCanvasStore();

  // Load studies on mount
  useEffect(() => {
    loadStudies();
  }, []);

  const loadStudies = async () => {
    setLoading(true);
    setError(null);
    try {
      const res = await fetch('/api/studies/');
      if (!res.ok) throw new Error('Failed to load studies');
      const data = await res.json();
      setStudies(data.studies || []);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load studies');
    } finally {
      setLoading(false);
    }
  };

  const loadStudyConfig = async (studyPath: string) => {
    setLoading(true);
    setError(null);
    try {
      const res = await fetch(`/api/studies/${encodeURIComponent(studyPath)}/config`);
      if (!res.ok) throw new Error('Config not found');
      const config = await res.json();
      loadFromConfig(config);
      onClose();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load config');
    } finally {
      setLoading(false);
    }
  };

  const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;

    const reader = new FileReader();
    reader.onload = (event) => {
      try {
        const config = JSON.parse(event.target?.result as string);
        loadFromConfig(config);
        onClose();
      } catch {
        setError('Invalid JSON file');
      }
    };
    reader.readAsText(file);
  };

  const handlePasteImport = () => {
    try {
      const config = JSON.parse(jsonInput);
      loadFromConfig(config);
      onClose();
    } catch {
      setError('Invalid JSON');
    }
  };

  const filteredStudies = studies.filter(s =>
    s.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
    s.category.toLowerCase().includes(searchQuery.toLowerCase())
  );

  const tabs = [
    { id: 'study', label: 'Load Study', icon: FolderOpen },
    { id: 'file', label: 'Upload File', icon: Upload },
    { id: 'paste', label: 'Paste JSON', icon: FileCode },
  ] as const;

  return (
    <div className="fixed inset-0 bg-black/60 backdrop-blur-sm flex items-center justify-center z-50">
      <div className="bg-dark-850 border border-dark-700 rounded-xl shadow-2xl w-full max-w-2xl max-h-[80vh] flex flex-col">
        {/* Header */}
        <div className="flex items-center justify-between px-5 py-4 border-b border-dark-700">
          <h2 className="text-lg font-semibold text-white">Import Configuration</h2>
          <button onClick={onClose} className="text-dark-400 hover:text-white transition-colors">
            <X size={20} />
          </button>
        </div>

        {/* Tabs */}
        <div className="flex border-b border-dark-700">
          {tabs.map((tab) => (
            <button
              key={tab.id}
              onClick={() => { setActiveTab(tab.id); setError(null); }}
              className={`flex items-center gap-2 px-4 py-3 text-sm font-medium transition-colors border-b-2 -mb-px ${
                activeTab === tab.id
                  ? 'text-primary-400 border-primary-400'
                  : 'text-dark-400 border-transparent hover:text-white'
              }`}
            >
              <tab.icon size={16} />
              {tab.label}
            </button>
          ))}
        </div>

        {/* Content */}
        <div className="flex-1 overflow-y-auto p-5">
          {error && (
            <div className="mb-4 flex items-center gap-2 px-3 py-2 bg-red-500/10 border border-red-500/30 rounded-lg text-red-400 text-sm">
              <AlertCircle size={16} />
              {error}
            </div>
          )}

          {activeTab === 'study' && (
            <div className="space-y-4">
              {/* Search */}
              <div className="relative">
                <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-dark-500" />
                <input
                  type="text"
                  value={searchQuery}
                  onChange={(e) => setSearchQuery(e.target.value)}
                  placeholder="Search studies..."
                  className="w-full pl-9 pr-3 py-2 bg-dark-800 border border-dark-600 rounded-lg
                           text-white placeholder-dark-500 text-sm
                           focus:border-primary-500 focus:ring-1 focus:ring-primary-500"
                />
              </div>

              {/* Study List */}
              <div className="space-y-1.5 max-h-[400px] overflow-y-auto">
                {loading ? (
                  <div className="flex items-center justify-center py-8 text-dark-400">
                    <Loader2 size={20} className="animate-spin mr-2" />
                    Loading studies...
                  </div>
                ) : filteredStudies.length === 0 ? (
                  <div className="text-center py-8 text-dark-500">
                    No studies found
                  </div>
                ) : (
                  filteredStudies.map((study) => (
                    <button
                      key={study.path}
                      onClick={() => setSelectedStudy(study.path)}
                      disabled={!study.has_config}
                      className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-lg text-left transition-colors ${
                        selectedStudy === study.path
                          ? 'bg-primary-500/20 border border-primary-500/50'
                          : study.has_config
                          ? 'bg-dark-800/50 border border-dark-700/50 hover:bg-dark-800 hover:border-dark-600'
                          : 'bg-dark-800/30 border border-dark-700/30 opacity-50 cursor-not-allowed'
                      }`}
                    >
                      <FolderOpen size={16} className={selectedStudy === study.path ? 'text-primary-400' : 'text-dark-400'} />
                      <div className="flex-1 min-w-0">
                        <div className="text-sm font-medium text-white truncate">{study.name}</div>
                        <div className="text-xs text-dark-500">{study.category} • {study.trial_count} trials</div>
                      </div>
                      {selectedStudy === study.path && <Check size={16} className="text-primary-400" />}
                    </button>
                  ))
                )}
              </div>
            </div>
          )}

          {activeTab === 'file' && (
            <div className="flex flex-col items-center justify-center py-12">
              <label className="flex flex-col items-center gap-3 px-8 py-6 border-2 border-dashed border-dark-600 rounded-xl cursor-pointer hover:border-primary-500/50 transition-colors">
                <Upload size={32} className="text-dark-400" />
                <div className="text-sm text-dark-300">Click to upload optimization_config.json</div>
                <input type="file" accept=".json" onChange={handleFileUpload} className="hidden" />
              </label>
            </div>
          )}

          {activeTab === 'paste' && (
            <div className="space-y-4">
              <textarea
                value={jsonInput}
                onChange={(e) => setJsonInput(e.target.value)}
                placeholder="Paste optimization_config.json content here..."
                className="w-full h-64 px-3 py-2 bg-dark-800 border border-dark-600 rounded-lg
                         text-white font-mono text-sm placeholder-dark-500
                         focus:border-primary-500 focus:ring-1 focus:ring-primary-500 resize-none"
              />
            </div>
          )}
        </div>

        {/* Footer */}
        <div className="flex justify-end gap-2 px-5 py-4 border-t border-dark-700">
          <button
            onClick={onClose}
            className="px-4 py-2 text-sm font-medium text-dark-300 hover:text-white transition-colors"
          >
            Cancel
          </button>
          {activeTab === 'study' && (
            <button
              onClick={() => selectedStudy && loadStudyConfig(selectedStudy)}
              disabled={!selectedStudy || loading}
              className="flex items-center gap-2 px-4 py-2 bg-primary-500 text-white rounded-lg
                       text-sm font-medium hover:bg-primary-600 transition-colors
                       disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {loading ? <Loader2 size={16} className="animate-spin" /> : <Check size={16} />}
              Load Study
            </button>
          )}
          {activeTab === 'paste' && (
            <button
              onClick={handlePasteImport}
              disabled={!jsonInput.trim()}
              className="flex items-center gap-2 px-4 py-2 bg-primary-500 text-white rounded-lg
                       text-sm font-medium hover:bg-primary-600 transition-colors
                       disabled:opacity-50 disabled:cursor-not-allowed"
            >
              <Check size={16} />
              Import
            </button>
          )}
        </div>
      </div>
    </div>
  );
}
```

---

# PHASE 4: NX Model Introspection

Add ability to introspect .sim files to extract expressions and model info.

## T4.1 - Add Backend NX Introspection Endpoint

**File:** `atomizer-dashboard/backend/api/routes/nx.py` (create new file)

```python
"""NX Model Introspection Endpoints."""
from fastapi import APIRouter, HTTPException
from pathlib import Path
import subprocess
import json
import os

router = APIRouter(prefix="/api/nx", tags=["nx"])

PYTHON_PATH = r"C:\Users\antoi\anaconda3\envs\atomizer\python.exe"
ATOMIZER_ROOT = Path(__file__).parent.parent.parent.parent.parent

@router.post("/introspect")
async def introspect_model(file_path: str):
    """
    Introspect an NX model file to extract expressions and configuration.
    Works with .prt, .sim, .fem files.
    """
    # Resolve path
    path = Path(file_path)
    if not path.is_absolute():
        path = ATOMIZER_ROOT / file_path

    if not path.exists():
        raise HTTPException(status_code=404, detail=f"File not found: {file_path}")

    # Run introspection script
    script = ATOMIZER_ROOT / "optimization_engine" / "nx" / "introspect_model.py"

    if not script.exists():
        # Return mock data if script doesn't exist yet
        return {
            "file_path": str(path),
            "file_type": path.suffix.lower().replace('.', ''),
            "expressions": [],
            "solver_type": None,
            "linked_files": [],
            "error": "Introspection script not found - returning empty data"
        }

    try:
        result = subprocess.run(
            [PYTHON_PATH, str(script), str(path)],
            capture_output=True,
            text=True,
            timeout=60,
            cwd=str(ATOMIZER_ROOT)
        )

        if result.returncode != 0:
            raise HTTPException(status_code=500, detail=f"Introspection failed: {result.stderr}")

        return json.loads(result.stdout)
    except subprocess.TimeoutExpired:
        raise HTTPException(status_code=504, detail="Introspection timed out")
    except json.JSONDecodeError:
        raise HTTPException(status_code=500, detail="Invalid introspection output")


@router.get("/expressions")
async def get_expressions(file_path: str):
    """Get just the expressions from an NX model."""
    result = await introspect_model(file_path)
    return {
        "file_path": file_path,
        "expressions": result.get("expressions", [])
    }
```

## T4.2 - Add Route to Main App

**File:** `atomizer-dashboard/backend/main.py`

Add import and include router:

```python
from api.routes import nx
app.include_router(nx.router)
```

## T4.3 - Create Introspection Script

**File:** `optimization_engine/nx/introspect_model.py`

```python
#!/usr/bin/env python
"""
NX Model Introspection Script.
Extracts expressions, solver info, and linked files from NX models.

Usage: python introspect_model.py <path_to_model>
"""
import sys
import json
from pathlib import Path

def introspect_prt(path: Path) -> dict:
    """Introspect a .prt file for expressions."""
    # Try to use NXOpen if available
    try:
        import NXOpen
        # ... NXOpen introspection code
    except ImportError:
        pass

    # Fallback: Parse any associated expression files
    expressions = []

    # Look for expression export files
    exp_file = path.with_suffix('.exp')
    if exp_file.exists():
        with open(exp_file, 'r') as f:
            for line in f:
                if '=' in line and not line.strip().startswith('//'):
                    name = line.split('=')[0].strip()
                    expressions.append({
                        "name": name,
                        "type": "unknown",
                        "value": None,
                        "unit": None
                    })

    return {
        "file_path": str(path),
        "file_type": "prt",
        "expressions": expressions,
        "solver_type": None,
        "linked_files": []
    }


def introspect_sim(path: Path) -> dict:
    """Introspect a .sim file for solver and linked files."""
    result = {
        "file_path": str(path),
        "file_type": "sim",
        "expressions": [],
        "solver_type": None,
        "linked_files": []
    }

    # Find linked .fem file
    fem_path = path.with_suffix('.fem')
    if not fem_path.exists():
        # Try common naming patterns
        for suffix in ['_fem1.fem', '_fem.fem']:
            candidate = path.parent / (path.stem.replace('_sim1', '').replace('_sim', '') + suffix)
            if candidate.exists():
                fem_path = candidate
                break

    if fem_path.exists():
        result["linked_files"].append({
            "type": "fem",
            "path": str(fem_path)
        })

    # Find linked .prt file
    prt_path = path.parent / (path.stem.replace('_sim1', '').replace('_sim', '') + '.prt')
    if prt_path.exists():
        result["linked_files"].append({
            "type": "prt",
            "path": str(prt_path)
        })
        # Get expressions from prt
        prt_result = introspect_prt(prt_path)
        result["expressions"] = prt_result["expressions"]

    # Try to detect solver type from sim file
    try:
        with open(path, 'rb') as f:
            content = f.read(10000).decode('utf-8', errors='ignore')
            if 'SOL 101' in content or 'SESTATIC' in content:
                result["solver_type"] = "SOL101"
            elif 'SOL 103' in content or 'SEMODES' in content:
                result["solver_type"] = "SOL103"
            elif 'SOL 105' in content:
                result["solver_type"] = "SOL105"
            elif 'SOL 106' in content:
                result["solver_type"] = "SOL106"
            elif 'SOL 111' in content:
                result["solver_type"] = "SOL111"
            elif 'SOL 112' in content:
                result["solver_type"] = "SOL112"
    except:
        pass

    return result


def introspect_fem(path: Path) -> dict:
    """Introspect a .fem file."""
    result = {
        "file_path": str(path),
        "file_type": "fem",
        "expressions": [],
        "solver_type": None,
        "linked_files": []
    }

    # Find linked files
    prt_path = path.parent / (path.stem.replace('_fem1', '').replace('_fem', '') + '.prt')
    if prt_path.exists():
        result["linked_files"].append({"type": "prt", "path": str(prt_path)})
        prt_result = introspect_prt(prt_path)
        result["expressions"] = prt_result["expressions"]

    return result


def main():
    if len(sys.argv) < 2:
        print(json.dumps({"error": "No file path provided"}))
        sys.exit(1)

    path = Path(sys.argv[1])

    if not path.exists():
        print(json.dumps({"error": f"File not found: {path}"}))
        sys.exit(1)

    suffix = path.suffix.lower()

    if suffix == '.prt':
        result = introspect_prt(path)
    elif suffix == '.sim':
        result = introspect_sim(path)
    elif suffix == '.fem':
        result = introspect_fem(path)
    else:
        result = {
            "file_path": str(path),
            "file_type": suffix.replace('.', ''),
            "expressions": [],
            "solver_type": None,
            "linked_files": [],
            "error": f"Unsupported file type: {suffix}"
        }

    print(json.dumps(result, indent=2))


if __name__ == "__main__":
    main()
```

---

# PHASE 5: Expression Search/Dropdown in NodeConfigPanel

Add expression dropdown with search for design variables.

## T5.1 - Update NodeConfigPanel with Expression Search

**File:** `atomizer-dashboard/frontend/src/components/canvas/panels/NodeConfigPanel.tsx`

Add this component and update the design variable section:

```tsx
import { useState, useEffect, useMemo } from 'react';
import { useCanvasStore } from '../../../hooks/useCanvasStore';
import { CanvasNodeData } from '../../../lib/canvas/schema';
import {
  Trash2,
  Check,
  Search,
  Loader2,
  ChevronDown,
  RefreshCw,
  X,
} from 'lucide-react';

// Expression search dropdown component
function ExpressionSelector({
  value,
  onChange,
  modelPath,
}: {
  value: string;
  onChange: (expr: string) => void;
  modelPath?: string;
}) {
  const [isOpen, setIsOpen] = useState(false);
  const [search, setSearch] = useState('');
  const [expressions, setExpressions] = useState<Array<{ name: string; value?: number; unit?: string }>>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const loadExpressions = async () => {
    if (!modelPath) {
      setError('No model selected');
      return;
    }
    setLoading(true);
    setError(null);
    try {
      const res = await fetch(`/api/nx/expressions?file_path=${encodeURIComponent(modelPath)}`);
      if (!res.ok) throw new Error('Failed to load expressions');
      const data = await res.json();
      setExpressions(data.expressions || []);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load');
      // Add some mock expressions for testing
      setExpressions([
        { name: 'thickness', value: 10, unit: 'mm' },
        { name: 'width', value: 50, unit: 'mm' },
        { name: 'height', value: 100, unit: 'mm' },
        { name: 'radius', value: 25, unit: 'mm' },
        { name: 'angle', value: 45, unit: 'deg' },
      ]);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    if (isOpen && expressions.length === 0 && !loading) {
      loadExpressions();
    }
  }, [isOpen]);

  const filtered = useMemo(() => {
    if (!search) return expressions;
    const q = search.toLowerCase();
    return expressions.filter(e => e.name.toLowerCase().includes(q));
  }, [expressions, search]);

  return (
    <div className="relative">
      <button
        type="button"
        onClick={() => setIsOpen(!isOpen)}
        className="w-full flex items-center justify-between px-3 py-2 bg-dark-800 border border-dark-600 rounded-lg
                   text-left text-sm text-white hover:border-dark-500 transition-colors"
      >
        <span className={value ? 'font-mono' : 'text-dark-500'}>
          {value || 'Select expression...'}
        </span>
        <ChevronDown size={16} className={`text-dark-400 transition-transform ${isOpen ? 'rotate-180' : ''}`} />
      </button>

      {isOpen && (
        <div className="absolute top-full left-0 right-0 mt-1 bg-dark-800 border border-dark-600 rounded-lg shadow-xl z-50 overflow-hidden">
          {/* Search */}
          <div className="p-2 border-b border-dark-700">
            <div className="relative">
              <Search size={14} className="absolute left-2.5 top-1/2 -translate-y-1/2 text-dark-500" />
              <input
                type="text"
                value={search}
                onChange={(e) => setSearch(e.target.value)}
                placeholder="Search expressions..."
                className="w-full pl-8 pr-8 py-1.5 bg-dark-700 border border-dark-600 rounded text-sm text-white placeholder-dark-500 focus:border-primary-500"
                autoFocus
              />
              <button
                onClick={loadExpressions}
                className="absolute right-2 top-1/2 -translate-y-1/2 text-dark-400 hover:text-white"
                title="Refresh"
              >
                <RefreshCw size={14} className={loading ? 'animate-spin' : ''} />
              </button>
            </div>
          </div>

          {/* List */}
          <div className="max-h-48 overflow-y-auto">
            {loading ? (
              <div className="flex items-center justify-center py-4 text-dark-400">
                <Loader2 size={16} className="animate-spin mr-2" />
                Loading...
              </div>
            ) : filtered.length === 0 ? (
              <div className="py-4 text-center text-dark-500 text-sm">
                {expressions.length === 0 ? 'No expressions found' : 'No matches'}
              </div>
            ) : (
              filtered.map((expr) => (
                <button
                  key={expr.name}
                  type="button"
                  onClick={() => {
                    onChange(expr.name);
                    setIsOpen(false);
                    setSearch('');
                  }}
                  className={`w-full flex items-center justify-between px-3 py-2 text-sm hover:bg-dark-700 transition-colors ${
                    value === expr.name ? 'bg-primary-500/20 text-primary-400' : 'text-white'
                  }`}
                >
                  <span className="font-mono">{expr.name}</span>
                  {expr.value !== undefined && (
                    <span className="text-dark-500 text-xs">
                      {expr.value} {expr.unit || ''}
                    </span>
                  )}
                </button>
              ))
            )}
          </div>

          {/* Manual input option */}
          <div className="p-2 border-t border-dark-700">
            <button
              type="button"
              onClick={() => {
                const name = prompt('Enter expression name:');
                if (name) {
                  onChange(name);
                  setIsOpen(false);
                }
              }}
              className="w-full text-xs text-dark-400 hover:text-white transition-colors"
            >
              + Enter manually
            </button>
          </div>
        </div>
      )}
    </div>
  );
}

interface NodeConfigPanelProps {
  nodeId: string;
}

export function NodeConfigPanel({ nodeId }: NodeConfigPanelProps) {
  const { nodes, updateNodeData, deleteSelected } = useCanvasStore();
  const node = nodes.find((n) => n.id === nodeId);

  if (!node) return null;

  const { data } = node;

  // Find model node to get file path for expression lookup
  const modelNode = nodes.find(n => n.data.type === 'model');
  const modelPath = modelNode?.data.type === 'model' ? (modelNode.data as any).filePath : undefined;

  const handleChange = (field: string, value: unknown) => {
    updateNodeData(nodeId, { [field]: value, configured: true });
  };

  const inputClass = "w-full px-3 py-2 bg-dark-800 border border-dark-600 rounded-lg text-white text-sm placeholder-dark-500 focus:border-primary-500 focus:ring-1 focus:ring-primary-500 transition-colors";
  const selectClass = "w-full px-3 py-2 bg-dark-800 border border-dark-600 rounded-lg text-white text-sm focus:border-primary-500 transition-colors";
  const labelClass = "block text-xs font-medium text-dark-400 mb-1.5";

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="flex-shrink-0 px-4 py-3 border-b border-dark-700">
        <div className="flex items-center justify-between">
          <div>
            <h3 className="font-medium text-white text-sm">Configure Node</h3>
            <p className="text-xs text-dark-500 capitalize">{data.type}</p>
          </div>
          <button
            onClick={deleteSelected}
            className="p-1.5 text-dark-400 hover:text-red-400 hover:bg-red-500/10 rounded transition-colors"
            title="Delete node"
          >
            <Trash2 size={16} />
          </button>
        </div>
      </div>

      {/* Content */}
      <div className="flex-1 overflow-y-auto p-4 space-y-4">
        {/* Label - common to all */}
        <div>
          <label className={labelClass}>Label</label>
          <input
            type="text"
            value={data.label}
            onChange={(e) => handleChange('label', e.target.value)}
            className={inputClass}
          />
        </div>

        {/* Design Variable - with Expression Selector */}
        {data.type === 'designVar' && (
          <>
            <div>
              <label className={labelClass}>Expression Name</label>
              <ExpressionSelector
                value={(data as any).expressionName || ''}
                onChange={(expr) => handleChange('expressionName', expr)}
                modelPath={modelPath}
              />
            </div>
            <div className="grid grid-cols-2 gap-3">
              <div>
                <label className={labelClass}>Min Value</label>
                <input
                  type="number"
                  value={(data as any).minValue ?? ''}
                  onChange={(e) => handleChange('minValue', parseFloat(e.target.value) || 0)}
                  className={inputClass}
                  placeholder="0"
                />
              </div>
              <div>
                <label className={labelClass}>Max Value</label>
                <input
                  type="number"
                  value={(data as any).maxValue ?? ''}
                  onChange={(e) => handleChange('maxValue', parseFloat(e.target.value) || 100)}
                  className={inputClass}
                  placeholder="100"
                />
              </div>
            </div>
            <div>
              <label className={labelClass}>Unit</label>
              <input
                type="text"
                value={(data as any).unit || ''}
                onChange={(e) => handleChange('unit', e.target.value)}
                className={inputClass}
                placeholder="mm"
              />
            </div>
          </>
        )}

        {/* Add other node type configurations following the same pattern */}
        {/* ... (include all other node types from earlier) ... */}
      </div>

      {/* Footer status */}
      <div className="flex-shrink-0 px-4 py-3 border-t border-dark-700">
        <div className="flex items-center gap-2">
          <div className={`w-2 h-2 rounded-full ${data.configured ? 'bg-green-400' : 'bg-amber-400'}`} />
          <span className={`text-xs ${data.configured ? 'text-green-400' : 'text-amber-400'}`}>
            {data.configured ? 'Configured' : 'Needs configuration'}
          </span>
        </div>
      </div>
    </div>
  );
}
```

---

# PHASE 6: Claude Chat Integration & Process Button

Fix the Claude CLI integration and add the "Process with Claude" functionality.

## T6.1 - Update useCanvasChat Hook

**File:** `atomizer-dashboard/frontend/src/hooks/useCanvasChat.ts`

```typescript
import { useCallback, useState } from 'react';
import { useChat } from './useChat';
import { OptimizationIntent } from '../lib/canvas/intent';

export function useCanvasChat() {
  const { sendMessage, messages, isConnected, isThinking, clearMessages } = useChat();
  const [lastIntent, setLastIntent] = useState<OptimizationIntent | null>(null);

  const processWithClaude = useCallback(async (intent: OptimizationIntent) => {
    setLastIntent(intent);

    const message = `I have designed an optimization workflow using the Canvas Builder. Please analyze this configuration and help me create the optimization study.

## Optimization Intent

\`\`\`json
${JSON.stringify(intent, null, 2)}
\`\`\`

## Instructions

1. **Validate** the configuration for completeness and correctness
2. **Recommend** any improvements based on Atomizer protocols (SYS_12 for extractors, SYS_15 for method selection)
3. **Create** the study if the configuration is valid, or explain what needs to be fixed

Use your knowledge of:
- Atomizer extractors (E1-E10)
- Optimization methods (TPE, CMA-ES, NSGA-II, GP-BO)
- Best practices from LAC (Learning Atomizer Core)

Please proceed with the analysis.`;

    await sendMessage(message);
  }, [sendMessage]);

  const validateWithClaude = useCallback(async (intent: OptimizationIntent) => {
    const message = `Please validate this Canvas optimization intent WITHOUT creating a study:

\`\`\`json
${JSON.stringify(intent, null, 2)}
\`\`\`

Check for:
1. Missing required components
2. Invalid extractor selections
3. Algorithm appropriateness for the problem type
4. Constraint feasibility

Provide specific recommendations.`;

    await sendMessage(message);
  }, [sendMessage]);

  const analyzeWithClaude = useCallback(async (intent: OptimizationIntent) => {
    const message = `Analyze this optimization setup and provide expert recommendations:

\`\`\`json
${JSON.stringify(intent, null, 2)}
\`\`\`

Consider:
1. Is ${intent.optimization?.method || 'the selected method'} appropriate for ${intent.objectives?.length || 0} objective(s)?
2. Are the design variable ranges reasonable?
3. Would a neural surrogate help with this problem?
4. What trial count would you recommend?

Use Atomizer protocols SYS_15 (Method Selector) and SYS_14 (Neural Acceleration) for guidance.`;

    await sendMessage(message);
  }, [sendMessage]);

  return {
    processWithClaude,
    validateWithClaude,
    analyzeWithClaude,
    messages,
    isConnected,
    isThinking,
    clearMessages,
    lastIntent,
  };
}
```

## T6.2 - Update ChatPanel for Canvas Context

**File:** `atomizer-dashboard/frontend/src/components/canvas/panels/ChatPanel.tsx`

```tsx
import { useRef, useEffect } from 'react';
import { useCanvasChat } from '../../../hooks/useCanvasChat';
import { useCanvasStore } from '../../../hooks/useCanvasStore';
import { ChatMessage } from '../../chat/ChatMessage';
import { ThinkingIndicator } from '../../chat/ThinkingIndicator';
import {
  X,
  Send,
  Sparkles,
  Wifi,
  WifiOff,
  Trash2,
} from 'lucide-react';

interface ChatPanelProps {
  onClose: () => void;
}

export function ChatPanel({ onClose }: ChatPanelProps) {
  const messagesEndRef = useRef<HTMLDivElement>(null);
  const inputRef = useRef<HTMLInputElement>(null);
  const { messages, isConnected, isThinking, clearMessages } = useCanvasChat();
  const { nodes, toIntent, validation } = useCanvasStore();

  useEffect(() => {
    messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
  }, [messages]);

  const handleSend = async () => {
    const input = inputRef.current;
    if (!input?.value.trim()) return;

    // TODO: Send message
    input.value = '';
  };

  const nodeCount = nodes.length;
  const isValid = validation.valid;

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="flex-shrink-0 px-4 py-3 border-b border-dark-700">
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-2">
            <Sparkles size={16} className="text-primary-400" />
            <span className="font-medium text-white text-sm">Claude Assistant</span>
          </div>
          <div className="flex items-center gap-1">
            <div className={`w-2 h-2 rounded-full ${isConnected ? 'bg-green-400' : 'bg-red-400'}`} />
            <button
              onClick={clearMessages}
              className="p-1.5 text-dark-400 hover:text-white transition-colors"
              title="Clear chat"
            >
              <Trash2 size={14} />
            </button>
            <button
              onClick={onClose}
              className="p-1.5 text-dark-400 hover:text-white transition-colors"
            >
              <X size={16} />
            </button>
          </div>
        </div>

        {/* Canvas status */}
        <div className="mt-2 flex items-center gap-2 text-xs">
          <span className="text-dark-500">{nodeCount} nodes</span>
          <span className="text-dark-700">•</span>
          <span className={isValid ? 'text-green-400' : 'text-amber-400'}>
            {isValid ? 'Valid' : 'Needs validation'}
          </span>
        </div>
      </div>

      {/* Messages */}
      <div className="flex-1 overflow-y-auto p-4 space-y-4">
        {messages.length === 0 ? (
          <div className="flex flex-col items-center justify-center h-full text-center px-4">
            <Sparkles size={32} className="text-dark-600 mb-3" />
            <p className="text-dark-400 text-sm mb-1">Canvas Assistant</p>
            <p className="text-dark-500 text-xs">
              Click "Process with Claude" to analyze your workflow and create a study.
            </p>
          </div>
        ) : (
          messages.map((msg, i) => (
            <ChatMessage key={i} message={msg} />
          ))
        )}
        {isThinking && <ThinkingIndicator />}
        <div ref={messagesEndRef} />
      </div>

      {/* Input */}
      <div className="flex-shrink-0 p-3 border-t border-dark-700">
        <div className="flex items-center gap-2">
          <input
            ref={inputRef}
            type="text"
            placeholder="Ask about your optimization..."
            className="flex-1 px-3 py-2 bg-dark-800 border border-dark-600 rounded-lg
                     text-sm text-white placeholder-dark-500
                     focus:border-primary-500 focus:ring-1 focus:ring-primary-500"
            onKeyDown={(e) => e.key === 'Enter' && handleSend()}
          />
          <button
            onClick={handleSend}
            className="p-2 bg-primary-500 text-white rounded-lg hover:bg-primary-600 transition-colors"
          >
            <Send size={16} />
          </button>
        </div>
      </div>
    </div>
  );
}
```

---

# PHASE 7: MCP Canvas Tools

Add the missing MCP tools for canvas intent handling.

## T7.1 - Update canvas.ts MCP Tools

**File:** `mcp-server/atomizer-tools/src/tools/canvas.ts`

Verify and update the canvas tools to properly handle intent validation and execution:

```typescript
import { AtomizerTool } from '../index.js';
import { spawn } from 'child_process';
import { ATOMIZER_ROOT, PYTHON_PATH } from '../utils/paths.js';
import path from 'path';

// Helper to run Python scripts
async function runPython(script: string, args: Record<string, unknown>): Promise<string> {
  return new Promise((resolve, reject) => {
    const proc = spawn(PYTHON_PATH, [
      path.join(ATOMIZER_ROOT, script),
      JSON.stringify(args)
    ], {
      cwd: ATOMIZER_ROOT,
      env: { ...process.env, ATOMIZER_ROOT }
    });

    let stdout = '';
    let stderr = '';

    proc.stdout.on('data', (data) => { stdout += data; });
    proc.stderr.on('data', (data) => { stderr += data; });

    proc.on('close', (code) => {
      if (code === 0) {
        resolve(stdout);
      } else {
        reject(new Error(stderr || `Process exited with code ${code}`));
      }
    });
  });
}

export const canvasTools: AtomizerTool[] = [
  {
    definition: {
      name: 'validate_canvas_intent',
      description: 'Validate an optimization intent from the Canvas Builder. Checks for completeness, valid extractors, appropriate algorithms, and constraint feasibility.',
      inputSchema: {
        type: 'object',
        properties: {
          intent: {
            type: 'object',
            description: 'The OptimizationIntent JSON from the canvas',
          },
        },
        required: ['intent'],
      },
    },
    handler: async (args) => {
      const intent = args.intent as Record<string, unknown>;
      const errors: string[] = [];
      const warnings: string[] = [];
      const recommendations: string[] = [];

      // Check model
      if (!intent.model || !(intent.model as any).path) {
        errors.push('Missing model file - add a Model node with file path');
      }

      // Check solver
      if (!intent.solver || !(intent.solver as any).type) {
        errors.push('Missing solver type - add a Solver node');
      }

      // Check design variables
      const dvs = (intent.design_variables as any[]) || [];
      if (dvs.length === 0) {
        errors.push('No design variables - add at least one Design Variable node');
      } else {
        dvs.forEach((dv, i) => {
          if (!dv.name) errors.push(`Design variable ${i + 1}: missing name`);
          if (dv.min === undefined || dv.max === undefined) {
            warnings.push(`Design variable "${dv.name}": missing bounds`);
          } else if (dv.min >= dv.max) {
            errors.push(`Design variable "${dv.name}": min must be less than max`);
          }
        });
      }

      // Check objectives
      const objectives = (intent.objectives as any[]) || [];
      if (objectives.length === 0) {
        errors.push('No objectives - add at least one Objective node');
      }

      // Check algorithm
      const opt = intent.optimization as any;
      if (!opt?.method) {
        warnings.push('No algorithm specified - will use default TPE');
      } else if (objectives.length > 1 && opt.method !== 'NSGA-II') {
        recommendations.push(`Multi-objective detected: consider using NSGA-II instead of ${opt.method}`);
      }

      // Check extractors
      const extractors = (intent.extractors as any[]) || [];
      const validExtractors = ['E1', 'E2', 'E3', 'E4', 'E5', 'E8', 'E9', 'E10'];
      extractors.forEach((ext) => {
        if (!validExtractors.includes(ext.id)) {
          warnings.push(`Unknown extractor: ${ext.id}`);
        }
      });

      const valid = errors.length === 0;

      return {
        content: [{
          type: 'text',
          text: JSON.stringify({
            valid,
            errors,
            warnings,
            recommendations,
            summary: valid
              ? `Intent is valid: ${dvs.length} variables, ${objectives.length} objectives, ${opt?.method || 'TPE'} method`
              : `Intent has ${errors.length} error(s) that must be fixed`,
          }, null, 2),
        }],
      };
    },
  },
  {
    definition: {
      name: 'execute_canvas_intent',
      description: 'Create an optimization study from a Canvas intent. Generates optimization_config.json and study structure.',
      inputSchema: {
        type: 'object',
        properties: {
          intent: {
            type: 'object',
            description: 'The validated OptimizationIntent JSON',
          },
          study_name: {
            type: 'string',
            description: 'Name for the study (snake_case)',
          },
          auto_run: {
            type: 'boolean',
            description: 'Whether to start optimization immediately',
          },
        },
        required: ['intent', 'study_name'],
      },
    },
    handler: async (args) => {
      const { intent, study_name, auto_run } = args as {
        intent: Record<string, unknown>;
        study_name: string;
        auto_run?: boolean;
      };

      try {
        // Call Python study creator
        const result = await runPython(
          'optimization_engine/study/creator.py',
          { intent, study_name, auto_run: auto_run || false }
        );

        return {
          content: [{
            type: 'text',
            text: result,
          }],
        };
      } catch (error) {
        return {
          content: [{
            type: 'text',
            text: `Failed to create study: ${error instanceof Error ? error.message : 'Unknown error'}`,
          }],
          isError: true,
        };
      }
    },
  },
  {
    definition: {
      name: 'interpret_canvas_intent',
      description: 'Analyze a Canvas intent and provide optimization recommendations without creating anything.',
      inputSchema: {
        type: 'object',
        properties: {
          intent: {
            type: 'object',
            description: 'The OptimizationIntent JSON to analyze',
          },
        },
        required: ['intent'],
      },
    },
    handler: async (args) => {
      const intent = args.intent as Record<string, unknown>;
      const objectives = (intent.objectives as any[]) || [];
      const dvs = (intent.design_variables as any[]) || [];
      const opt = intent.optimization as any;

      const analysis = {
        problem_type: objectives.length > 1 ? 'multi-objective' : 'single-objective',
        complexity: dvs.length <= 3 ? 'low' : dvs.length <= 10 ? 'medium' : 'high',
        recommended_method: objectives.length > 1 ? 'NSGA-II' : dvs.length > 10 ? 'CMA-ES' : 'TPE',
        recommended_trials: Math.max(50, dvs.length * 20),
        surrogate_recommended: dvs.length >= 5 || (opt?.max_trials || 100) > 100,
        notes: [] as string[],
      };

      if (opt?.method && opt.method !== analysis.recommended_method) {
        analysis.notes.push(
          `Current method ${opt.method} may not be optimal. Consider ${analysis.recommended_method}.`
        );
      }

      if (analysis.surrogate_recommended && !intent.surrogate) {
        analysis.notes.push(
          'Neural surrogate recommended for this problem complexity. Add a Surrogate node.'
        );
      }

      return {
        content: [{
          type: 'text',
          text: JSON.stringify(analysis, null, 2),
        }],
      };
    },
  },
];
```

---

# PHASE 8: Final Integration & Testing

## T8.1 - Build and Test

```bash
# Build MCP server
cd mcp-server/atomizer-tools
npm run build

# Build frontend
cd ../../atomizer-dashboard/frontend
npm run build

# Start dev server
npm run dev
```

## T8.2 - Commit All Changes

```bash
git add .
git commit -m "feat: Canvas Professional Upgrade V2

Phase 1: Professional Lucide Icons
- Replace all emoji icons with Lucide React
- Update NodePalette, BaseNode, all node components
- Update templates with icon names

Phase 2: Responsive Full-Screen Canvas
- Canvas adapts to window size
- Compact header, full canvas area
- Floating action buttons

Phase 3: Auto-Load from Config
- Backend endpoint for study configs
- Study browser with search
- loadFromConfig in canvas store

Phase 4: NX Model Introspection
- Backend introspection endpoint
- Extract expressions from .prt/.sim/.fem
- Detect solver type from .sim

Phase 5: Expression Search/Dropdown
- ExpressionSelector component
- Search and filter expressions
- Manual entry fallback

Phase 6: Claude Chat Integration
- useCanvasChat hook with Claude prompts
- Process with Claude button
- Context-aware chat panel

Phase 7: MCP Canvas Tools
- validate_canvas_intent
- execute_canvas_intent
- interpret_canvas_intent

Phase 8: Testing & Polish
- Full build verification
- Dark theme consistency

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

git push origin main && git push github main
```

---

# ACCEPTANCE CRITERIA

Before marking complete, verify:

1. [ ] `npm run build` passes in frontend
2. [ ] `npm run build` passes in MCP server
3. [ ] Canvas displays with Lucide icons (no emojis)
4. [ ] Canvas fills available screen space
5. [ ] Nodes can be dragged from palette
6. [ ] Clicking a node opens config panel
7. [ ] Config panel has dark theme styling
8. [ ] Expression dropdown appears for design variables
9. [ ] Import button shows study browser
10. [ ] "Process with Claude" button triggers chat
11. [ ] Templates modal opens and shows templates
12. [ ] All text is readable (white on dark)

---

# BEGIN EXECUTION

Execute all phases sequentially. Use TodoWrite to track progress. Complete each phase fully before moving to the next. Do not stop between phases.

**GO.**