feat: add node shape variants with five distinct shapes

Implements configurable shape variants for actor nodes, allowing visual
differentiation of node types beyond just color.

Features:
- Five shape options: rectangle, circle, rounded rectangle, ellipse, pill
- All shapes use pure CSS (border-radius) for consistent behavior
- Auto-grow with content
- Perfect shadow and selection/highlight effects
- Proper React Flow handle alignment
- Shape selector UI with visual previews
- Migration logic for existing documents (defaults to rectangle)

Shape characteristics:
- Rectangle: Standard, general purpose
- Circle: Round, for people and concepts
- Rounded Rectangle: Soft edges, friendly appearance
- Ellipse: Oval/horizontal, for processes and stages
- Pill: Capsule, compact for tags and labels

Technical approach:
- Uses border-radius for all shapes (no clip-path)
- Ensures boxShadow follows shape contours properly
- Each shape component maintains consistent props interface
- NodeShapeRenderer routes to appropriate shape component

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/components/Config/NodeTypeConfig.tsx

@@ -25,6 +25,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
 
   const [newTypeName, setNewTypeName] = useState('');
   const [newTypeColor, setNewTypeColor] = useState('#6366f1');
+  const [newTypeShape, setNewTypeShape] = useState<import('../../types').NodeShape>('rectangle');
   const [newTypeDescription, setNewTypeDescription] = useState('');
   const [newTypeIcon, setNewTypeIcon] = useState('');
 
@@ -32,6 +33,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
   const [editingId, setEditingId] = useState<string | null>(null);
   const [editLabel, setEditLabel] = useState('');
   const [editColor, setEditColor] = useState('');
+  const [editShape, setEditShape] = useState<import('../../types').NodeShape>('rectangle');
   const [editIcon, setEditIcon] = useState('');
   const [editDescription, setEditDescription] = useState('');
 
@@ -53,6 +55,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
       id,
       label: newTypeName.trim(),
       color: newTypeColor,
+      shape: newTypeShape,
       icon: newTypeIcon || undefined,
       description: newTypeDescription.trim() || undefined,
     };
@@ -62,6 +65,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
     // Reset form
     setNewTypeName('');
     setNewTypeColor('#6366f1');
+    setNewTypeShape('rectangle');
     setNewTypeDescription('');
     setNewTypeIcon('');
   };
@@ -82,6 +86,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
     setEditingId(type.id);
     setEditLabel(type.label);
     setEditColor(type.color);
+    setEditShape(type.shape || 'rectangle');
     setEditIcon(type.icon || '');
     setEditDescription(type.description || '');
   };
@@ -92,6 +97,7 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
     updateNodeType(editingId, {
       label: editLabel.trim(),
       color: editColor,
+      shape: editShape,
       icon: editIcon || undefined,
       description: editDescription.trim() || undefined,
     });
@@ -124,10 +130,12 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
             <NodeTypeForm
               name={newTypeName}
               color={newTypeColor}
+              shape={newTypeShape}
               icon={newTypeIcon}
               description={newTypeDescription}
               onNameChange={setNewTypeName}
               onColorChange={setNewTypeColor}
+              onShapeChange={setNewTypeShape}
               onIconChange={setNewTypeIcon}
               onDescriptionChange={setNewTypeDescription}
             />
@@ -154,10 +162,12 @@ const NodeTypeConfigModal = ({ isOpen, onClose }: Props) => {
                       <NodeTypeForm
                         name={editLabel}
                         color={editColor}
+                        shape={editShape}
                         icon={editIcon}
                         description={editDescription}
                         onNameChange={setEditLabel}
                         onColorChange={setEditColor}
+                        onShapeChange={setEditShape}
                         onIconChange={setEditIcon}
                         onDescriptionChange={setEditDescription}
                       />

src/components/Config/NodeTypeForm.tsx

@@ -1,4 +1,6 @@
 import IconSelector from './IconSelector';
+import ShapeSelector from './ShapeSelector';
+import type { NodeShape } from '../../types';
 
 /**
  * NodeTypeForm - Reusable form fields for creating/editing node types
@@ -6,6 +8,7 @@ import IconSelector from './IconSelector';
  * Features:
  * - Name input
  * - Color picker (visual + text input)
+ * - Shape selector
  * - Icon selector
  * - Description input
  */
@@ -13,10 +16,12 @@ import IconSelector from './IconSelector';
 interface Props {
   name: string;
   color: string;
+  shape: NodeShape;
   icon: string;
   description: string;
   onNameChange: (value: string) => void;
   onColorChange: (value: string) => void;
+  onShapeChange: (value: NodeShape) => void;
   onIconChange: (value: string) => void;
   onDescriptionChange: (value: string) => void;
 }
@@ -24,10 +29,12 @@ interface Props {
 const NodeTypeForm = ({
   name,
   color,
+  shape,
   icon,
   description,
   onNameChange,
   onColorChange,
+  onShapeChange,
   onIconChange,
   onDescriptionChange,
 }: Props) => {
@@ -67,6 +74,8 @@ const NodeTypeForm = ({
         </div>
       </div>
 
+      <ShapeSelector value={shape} onChange={onShapeChange} color={color} />
+
       <IconSelector selectedIcon={icon} onSelect={onIconChange} />
 
       <div>

src/components/Config/ShapeSelector.tsx

@@ -0,0 +1,196 @@
+import type { NodeShape } from '../../types';
+
+interface ShapeSelectorProps {
+  value: NodeShape;
+  onChange: (shape: NodeShape) => void;
+  color?: string;
+}
+
+interface ShapeOption {
+  id: NodeShape;
+  label: string;
+  description: string;
+}
+
+const SHAPE_OPTIONS: ShapeOption[] = [
+  {
+    id: 'rectangle',
+    label: 'Rectangle',
+    description: 'Standard rectangular shape, good for general purpose use',
+  },
+  {
+    id: 'circle',
+    label: 'Circle',
+    description: 'Circular shape, best for people and concepts',
+  },
+  {
+    id: 'roundedRectangle',
+    label: 'Rounded Rectangle',
+    description: 'Soft rounded rectangle, suitable for teams and groups',
+  },
+  {
+    id: 'ellipse',
+    label: 'Ellipse',
+    description: 'Oval shape, ideal for processes and stages',
+  },
+  {
+    id: 'pill',
+    label: 'Pill',
+    description: 'Capsule shape, perfect for tags and labels',
+  },
+];
+
+/**
+ * ShapeSelector - Visual selector for node shapes
+ *
+ * Displays all available shape options with visual previews
+ * and allows users to select a shape for their node type.
+ */
+const ShapeSelector = ({ value, onChange, color = '#3b82f6' }: ShapeSelectorProps) => {
+  return (
+    <div className="space-y-2">
+      <label className="block text-sm font-medium text-gray-700">
+        Shape
+      </label>
+      <div className="grid grid-cols-3 gap-3">
+        {SHAPE_OPTIONS.map((option) => {
+          const isSelected = value === option.id;
+          return (
+            <button
+              key={option.id}
+              type="button"
+              onClick={() => onChange(option.id)}
+              className={`
+                relative p-3 rounded-lg border-2 transition-all
+                hover:border-blue-400 hover:bg-blue-50
+                ${isSelected ? 'border-blue-500 bg-blue-50' : 'border-gray-300 bg-white'}
+              `}
+              title={option.description}
+            >
+              {/* Shape Preview */}
+              <div className="flex justify-center items-center h-12 mb-2">
+                <ShapePreview shape={option.id} color={color} size={40} />
+              </div>
+
+              {/* Shape Label */}
+              <div className="text-xs text-center text-gray-700 font-medium">
+                {option.label}
+              </div>
+
+              {/* Selected Indicator */}
+              {isSelected && (
+                <div className="absolute top-1 right-1 w-4 h-4 bg-blue-500 rounded-full flex items-center justify-center">
+                  <svg
+                    className="w-3 h-3 text-white"
+                    fill="none"
+                    viewBox="0 0 24 24"
+                    stroke="currentColor"
+                  >
+                    <path
+                      strokeLinecap="round"
+                      strokeLinejoin="round"
+                      strokeWidth={3}
+                      d="M5 13l4 4L19 7"
+                    />
+                  </svg>
+                </div>
+              )}
+            </button>
+          );
+        })}
+      </div>
+    </div>
+  );
+};
+
+/**
+ * ShapePreview - Renders a small preview of a shape
+ */
+const ShapePreview = ({ shape, color, size }: { shape: NodeShape; color: string; size: number }) => {
+  const svgSize = size;
+  const strokeWidth = 2;
+
+  switch (shape) {
+    case 'rectangle':
+      return (
+        <svg width={svgSize} height={svgSize * 0.7} viewBox="0 0 60 42">
+          <rect
+            x={strokeWidth}
+            y={strokeWidth}
+            width={60 - strokeWidth * 2}
+            height={42 - strokeWidth * 2}
+            fill={color}
+            stroke={color}
+            strokeWidth={strokeWidth}
+            rx="3"
+          />
+        </svg>
+      );
+
+    case 'circle':
+      return (
+        <svg width={svgSize} height={svgSize} viewBox="0 0 50 50">
+          <circle
+            cx="25"
+            cy="25"
+            r={25 - strokeWidth}
+            fill={color}
+            stroke={color}
+            strokeWidth={strokeWidth}
+          />
+        </svg>
+      );
+
+    case 'roundedRectangle':
+      return (
+        <svg width={svgSize} height={svgSize * 0.7} viewBox="0 0 60 42">
+          <rect
+            x={strokeWidth}
+            y={strokeWidth}
+            width={60 - strokeWidth * 2}
+            height={42 - strokeWidth * 2}
+            fill={color}
+            stroke={color}
+            strokeWidth={strokeWidth}
+            rx="12"
+          />
+        </svg>
+      );
+
+    case 'ellipse':
+      return (
+        <svg width={svgSize * 1.2} height={svgSize * 0.7} viewBox="0 0 60 35">
+          <ellipse
+            cx="30"
+            cy="17.5"
+            rx={30 - strokeWidth}
+            ry={17.5 - strokeWidth}
+            fill={color}
+            stroke={color}
+            strokeWidth={strokeWidth}
+          />
+        </svg>
+      );
+
+    case 'pill':
+      return (
+        <svg width={svgSize} height={svgSize * 0.5} viewBox="0 0 60 30">
+          <rect
+            x={strokeWidth}
+            y={strokeWidth}
+            width={60 - strokeWidth * 2}
+            height={30 - strokeWidth * 2}
+            fill={color}
+            stroke={color}
+            strokeWidth={strokeWidth}
+            rx="15"
+          />
+        </svg>
+      );
+
+    default:
+      return null;
+  }
+};
+
+export default ShapeSelector;

src/components/Nodes/CustomNode.tsx

@@ -8,6 +8,7 @@ import {
 } from "../../utils/colorUtils";
 import { getIconComponent } from "../../utils/iconUtils";
 import type { ActorData } from "../../types";
+import NodeShapeRenderer from "./Shapes/NodeShapeRenderer";
 
 /**
  * CustomNode - Represents an actor in the constellation graph
@@ -32,6 +33,7 @@ const CustomNode = ({ data, selected }: NodeProps<ActorData>) => {
   const nodeTypeConfig = nodeTypes.find((nt) => nt.id === data.type);
   const nodeColor = nodeTypeConfig?.color || "#6b7280";
   const nodeLabel = nodeTypeConfig?.label || "Unknown";
+  const nodeShape = nodeTypeConfig?.shape || "rectangle";
   const IconComponent = getIconComponent(nodeTypeConfig?.icon);
 
   // Determine text color based on background
@@ -86,23 +88,9 @@ const CustomNode = ({ data, selected }: NodeProps<ActorData>) => {
 
   return (
     <div
-      className={`
-        px-4 py-3 rounded-lg shadow-md min-w-[120px]
-        transition-all duration-200
-        ${selected ? "shadow-xl" : "shadow-md"}
-      `}
+      className="relative"
       style={{
-        backgroundColor: nodeColor,
-        borderWidth: "3px", // Keep consistent border width
-        borderStyle: "solid",
-        borderColor: borderColor,
-        color: textColor,
         opacity: nodeOpacity,
-        boxShadow: selected
-          ? `0 0 0 3px ${nodeColor}40` // Add outer glow when selected (40 = ~25% opacity)
-          : isHighlighted
-            ? `0 0 0 3px ${nodeColor}80, 0 0 12px ${nodeColor}60` // Highlight glow for search matches
-            : undefined,
       }}
     >
       {/* Connection handles - shown only when selected or connecting */}
@@ -166,7 +154,15 @@ const CustomNode = ({ data, selected }: NodeProps<ActorData>) => {
         }}
       />
 
-      {/* Node content */}
+      {/* Node content with shape renderer */}
+      <NodeShapeRenderer
+        shape={nodeShape}
+        color={nodeColor}
+        borderColor={borderColor}
+        textColor={textColor}
+        selected={selected}
+        isHighlighted={isHighlighted}
+      >
         <div className="space-y-1">
           {/* Icon (if available) */}
           {IconComponent && (
@@ -194,6 +190,7 @@ const CustomNode = ({ data, selected }: NodeProps<ActorData>) => {
             {nodeLabel}
           </div>
         </div>
+      </NodeShapeRenderer>
     </div>
   );
 };

src/components/Nodes/Shapes/CircleShape.tsx

@@ -0,0 +1,53 @@
+import { ReactNode } from 'react';
+
+interface CircleShapeProps {
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * CircleShape - Circular/elliptical node shape
+ *
+ * Best for: People, concepts, end states
+ * Characteristics: Compact, no directional bias, works well in radial layouts
+ * Handles: Positioned at cardinal points (top, right, bottom, left) of bounding box
+ */
+const CircleShape = ({
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: CircleShapeProps) => {
+  const shadowStyle = selected
+    ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}40`
+    : isHighlighted
+      ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}80, 0 0 12px ${color}60`
+      : '0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1)';
+
+  return (
+    <div
+      className={`px-4 py-3 rounded-full min-w-[120px] flex items-center justify-center transition-shadow duration-200 ${className}`}
+      style={{
+        backgroundColor: color,
+        borderWidth: '3px',
+        borderStyle: 'solid',
+        borderColor: borderColor,
+        color: textColor,
+        aspectRatio: '1 / 1',
+        boxShadow: shadowStyle,
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+export default CircleShape;

src/components/Nodes/Shapes/EllipseShape.tsx

@@ -0,0 +1,53 @@
+import { ReactNode } from 'react';
+
+interface EllipseShapeProps {
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * EllipseShape - Elliptical/oval node shape
+ *
+ * Best for: Processes, stages, states, horizontal groupings
+ * Characteristics: Wider than tall, smooth edges, good for labeled stages
+ * Handles: Positioned at cardinal points (top, right, bottom, left) of bounding box
+ */
+const EllipseShape = ({
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: EllipseShapeProps) => {
+  const shadowStyle = selected
+    ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}40`
+    : isHighlighted
+      ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}80, 0 0 12px ${color}60`
+      : '0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1)';
+
+  return (
+    <div
+      className={`px-6 py-3 min-w-[140px] min-h-[80px] flex items-center justify-center transition-shadow duration-200 ${className}`}
+      style={{
+        backgroundColor: color,
+        borderWidth: '3px',
+        borderStyle: 'solid',
+        borderColor: borderColor,
+        color: textColor,
+        borderRadius: '50%',
+        boxShadow: shadowStyle,
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+export default EllipseShape;

src/components/Nodes/Shapes/NodeShapeRenderer.tsx

@@ -0,0 +1,80 @@
+import { ReactNode } from 'react';
+import type { NodeShape } from '../../../types';
+import RectangleShape from './RectangleShape';
+import CircleShape from './CircleShape';
+import RoundedRectangleShape from './RoundedRectangleShape';
+import EllipseShape from './EllipseShape';
+import PillShape from './PillShape';
+
+interface NodeShapeRendererProps {
+  shape: NodeShape;
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * NodeShapeRenderer - Renders the appropriate shape component based on shape type
+ *
+ * This component acts as a router that selects the correct shape component
+ * to render based on the NodeTypeConfig.shape property.
+ *
+ * All shapes maintain consistent sizing and layout behavior to ensure
+ * proper alignment with React Flow's edge routing and layout algorithms.
+ *
+ * Usage:
+ *   <NodeShapeRenderer
+ *     shape="circle"
+ *     color="#3b82f6"
+ *     borderColor="#1e40af"
+ *     textColor="white"
+ *   >
+ *     <YourNodeContent />
+ *   </NodeShapeRenderer>
+ */
+const NodeShapeRenderer = ({
+  shape,
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: NodeShapeRendererProps) => {
+  const shapeProps = {
+    color,
+    borderColor,
+    textColor,
+    selected,
+    isHighlighted,
+    className,
+  };
+
+  switch (shape) {
+    case 'rectangle':
+      return <RectangleShape {...shapeProps}>{children}</RectangleShape>;
+
+    case 'circle':
+      return <CircleShape {...shapeProps}>{children}</CircleShape>;
+
+    case 'roundedRectangle':
+      return <RoundedRectangleShape {...shapeProps}>{children}</RoundedRectangleShape>;
+
+    case 'ellipse':
+      return <EllipseShape {...shapeProps}>{children}</EllipseShape>;
+
+    case 'pill':
+      return <PillShape {...shapeProps}>{children}</PillShape>;
+
+    default:
+      // Fallback to rectangle for unknown shapes
+      return <RectangleShape {...shapeProps}>{children}</RectangleShape>;
+  }
+};
+
+export default NodeShapeRenderer;

src/components/Nodes/Shapes/PillShape.tsx

@@ -0,0 +1,53 @@
+import { ReactNode } from 'react';
+
+interface PillShapeProps {
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * PillShape - Capsule/pill node shape
+ *
+ * Best for: Tags, labels, flow elements, actions
+ * Characteristics: Fully rounded ends, compact, modern look
+ * Handles: Positioned at cardinal points (top, right, bottom, left) of bounding box
+ */
+const PillShape = ({
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: PillShapeProps) => {
+  const shadowStyle = selected
+    ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}40`
+    : isHighlighted
+      ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}80, 0 0 12px ${color}60`
+      : '0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1)';
+
+  return (
+    <div
+      className={`px-6 py-3 min-w-[120px] flex items-center justify-center transition-shadow duration-200 ${className}`}
+      style={{
+        backgroundColor: color,
+        borderWidth: '3px',
+        borderStyle: 'solid',
+        borderColor: borderColor,
+        color: textColor,
+        borderRadius: '999px',
+        boxShadow: shadowStyle,
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+export default PillShape;

src/components/Nodes/Shapes/RectangleShape.tsx

@@ -0,0 +1,52 @@
+import { ReactNode } from 'react';
+
+interface RectangleShapeProps {
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * RectangleShape - Standard rectangular node shape
+ *
+ * This is the default shape, maintaining the current node appearance.
+ * Handles are positioned at the midpoints of each side (top, right, bottom, left).
+ */
+const RectangleShape = ({
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: RectangleShapeProps) => {
+  // Build shadow style
+  const shadowStyle = selected
+    ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}40`
+    : isHighlighted
+      ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}80, 0 0 12px ${color}60`
+      : '0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1)';
+
+  return (
+    <div
+      className={`px-4 py-3 rounded-lg min-w-[120px] transition-shadow duration-200 ${className}`}
+      style={{
+        backgroundColor: color,
+        borderWidth: '3px',
+        borderStyle: 'solid',
+        borderColor: borderColor,
+        color: textColor,
+        boxShadow: shadowStyle,
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+export default RectangleShape;

src/components/Nodes/Shapes/RoundedRectangleShape.tsx

@@ -0,0 +1,53 @@
+import { ReactNode } from 'react';
+
+interface RoundedRectangleShapeProps {
+  color: string;
+  borderColor: string;
+  textColor: string;
+  selected?: boolean;
+  isHighlighted?: boolean;
+  children: ReactNode;
+  className?: string;
+}
+
+/**
+ * RoundedRectangleShape - Rounded rectangular node shape
+ *
+ * Best for: Softer entities (teams, groups, communities)
+ * Characteristics: Friendly appearance, similar layout behavior to rectangle
+ * Handles: Positioned at the midpoints of each side (top, right, bottom, left)
+ */
+const RoundedRectangleShape = ({
+  color,
+  borderColor,
+  textColor,
+  selected = false,
+  isHighlighted = false,
+  children,
+  className = '',
+}: RoundedRectangleShapeProps) => {
+  const shadowStyle = selected
+    ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}40`
+    : isHighlighted
+      ? `0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1), 0 0 0 3px ${color}80, 0 0 12px ${color}60`
+      : '0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1)';
+
+  return (
+    <div
+      className={`px-4 py-3 min-w-[120px] transition-shadow duration-200 ${className}`}
+      style={{
+        backgroundColor: color,
+        borderWidth: '3px',
+        borderStyle: 'solid',
+        borderColor: borderColor,
+        color: textColor,
+        borderRadius: '24px', // More rounded than regular rectangle
+        boxShadow: shadowStyle,
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+export default RoundedRectangleShape;

src/stores/graphStore.ts

@@ -31,12 +31,12 @@ interface GraphStore {
   edgeTypes: EdgeTypeConfig[];
 }
 
-// Default node types
+// Default node types with semantic shape assignments
 const defaultNodeTypes: NodeTypeConfig[] = [
-  { id: 'person', label: 'Person', color: '#3b82f6', icon: 'Person', description: 'Individual person' },
-  { id: 'organization', label: 'Organization', color: '#10b981', icon: 'Business', description: 'Company or group' },
-  { id: 'system', label: 'System', color: '#f59e0b', icon: 'Computer', description: 'Technical system' },
-  { id: 'concept', label: 'Concept', color: '#8b5cf6', icon: 'Lightbulb', description: 'Abstract concept' },
+  { id: 'person', label: 'Person', color: '#3b82f6', shape: 'circle', icon: 'Person', description: 'Individual person' },
+  { id: 'organization', label: 'Organization', color: '#10b981', shape: 'rectangle', icon: 'Business', description: 'Company or group' },
+  { id: 'system', label: 'System', color: '#f59e0b', shape: 'roundedRectangle', icon: 'Computer', description: 'Technical system' },
+  { id: 'concept', label: 'Concept', color: '#8b5cf6', shape: 'roundedRectangle', icon: 'Lightbulb', description: 'Abstract concept' },
 ];
 
 // Default edge types

src/stores/persistence/loader.ts

@@ -140,6 +140,23 @@ export function getCurrentGraphFromDocument(document: ConstellationDocument): {
   }
 }
 
+// Migrate node types to include shape property if missing
+function migrateNodeTypes(nodeTypes: NodeTypeConfig[]): NodeTypeConfig[] {
+  return nodeTypes.map(nodeType => {
+    // If shape property already exists, return as-is
+    if (nodeType.shape) {
+      return nodeType;
+    }
+
+    // Otherwise, add default shape (rectangle) for backward compatibility
+    console.log(`Migrating node type "${nodeType.id}" to include shape property (defaulting to rectangle)`);
+    return {
+      ...nodeType,
+      shape: 'rectangle' as const,
+    };
+  });
+}
+
 // Deserialize graph state from a document
 export function deserializeGraphState(document: ConstellationDocument): {
   nodes: Actor[];
@@ -156,10 +173,13 @@ export function deserializeGraphState(document: ConstellationDocument): {
     const nodes = deserializeActors(currentGraph.nodes);
     const edges = deserializeRelations(currentGraph.edges);
 
+    // Migrate node types to include shape property
+    const migratedNodeTypes = migrateNodeTypes(currentGraph.nodeTypes);
+
     return {
       nodes,
       edges,
-      nodeTypes: currentGraph.nodeTypes,
+      nodeTypes: migratedNodeTypes,
       edgeTypes: currentGraph.edgeTypes,
     };
   } catch (error) {

src/stores/workspaceStore.ts

@@ -39,10 +39,10 @@ const defaultSettings: WorkspaceSettings = {
   maxOpenDocuments: 10,
   autoSaveEnabled: true,
   defaultNodeTypes: [
-    { id: 'person', label: 'Person', color: '#3b82f6', icon: 'Person', description: 'Individual person' },
-    { id: 'organization', label: 'Organization', color: '#10b981', icon: 'Business', description: 'Company or group' },
-    { id: 'system', label: 'System', color: '#f59e0b', icon: 'Computer', description: 'Technical system' },
-    { id: 'concept', label: 'Concept', color: '#8b5cf6', icon: 'Lightbulb', description: 'Abstract concept' },
+    { id: 'person', label: 'Person', color: '#3b82f6', shape: 'circle', icon: 'Person', description: 'Individual person' },
+    { id: 'organization', label: 'Organization', color: '#10b981', shape: 'rectangle', icon: 'Business', description: 'Company or group' },
+    { id: 'system', label: 'System', color: '#f59e0b', shape: 'roundedRectangle', icon: 'Computer', description: 'Technical system' },
+    { id: 'concept', label: 'Concept', color: '#8b5cf6', shape: 'roundedRectangle', icon: 'Lightbulb', description: 'Abstract concept' },
   ],
   defaultEdgeTypes: [
     { id: 'collaborates', label: 'Collaborates', color: '#3b82f6', style: 'solid' },

src/types/index.ts

@@ -23,11 +23,20 @@ export interface RelationData {
 
 export type Relation = Edge<RelationData>;
 
+// Node Shape Types
+export type NodeShape =
+  | 'rectangle'
+  | 'circle'
+  | 'roundedRectangle'
+  | 'ellipse'
+  | 'pill';
+
 // Node Type Configuration
 export interface NodeTypeConfig {
   id: string;
   label: string;
   color: string;
+  shape: NodeShape;
   icon?: string;
   description?: string;
 }