[docs] Add comprehensive Storybook documentation

- Add README.md explaining Storybook usage, benefits, and comparison with other tools
- Add CLAUDE.md with development guidelines for working with Storybook
- Include best practices, troubleshooting tips, and integration notes
- Address PR review feedback for better developer onboarding

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

Co-Authored-By: Claude <[email protected]>

.storybook/CLAUDE.md

@@ -0,0 +1,197 @@
+# Storybook Development Guidelines for Claude
+
+## Quick Commands
+
+- `npm run storybook`: Start Storybook development server
+- `npm run build-storybook`: Build static Storybook
+- `npm run test:component`: Run component tests (includes Storybook components)
+
+## Development Workflow for Storybook
+
+1. **Creating New Stories**:
+   - Place `*.stories.ts` files alongside components
+   - Follow the naming pattern: `ComponentName.stories.ts`
+   - Use realistic mock data that matches ComfyUI schemas
+
+2. **Testing Stories**:
+   - Verify stories render correctly in Storybook UI
+   - Test different component states and edge cases
+   - Ensure proper theming and styling
+
+3. **Code Quality**:
+   - Run `npm run typecheck` to verify TypeScript
+   - Run `npm run lint` to check for linting issues
+   - Follow existing story patterns and conventions
+
+## Story Creation Guidelines
+
+### Basic Story Structure
+
+```typescript
+import type { Meta, StoryObj } from '@storybook/vue3'
+import ComponentName from './ComponentName.vue'
+
+const meta: Meta<typeof ComponentName> = {
+  title: 'Category/ComponentName',
+  component: ComponentName,
+  parameters: {
+    layout: 'centered' // or 'fullscreen', 'padded'
+  }
+}
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  args: {
+    // Component props
+  }
+}
+```
+
+### Mock Data Patterns
+
+For ComfyUI components, use realistic mock data:
+
+```typescript
+// Node definition mock
+const mockNodeDef = {
+  input: {
+    required: {
+      prompt: ["STRING", { multiline: true }]
+    }
+  },
+  output: ["CONDITIONING"],
+  output_is_list: [false],
+  category: "conditioning"
+}
+
+// Component instance mock
+const mockComponent = {
+  id: "1",
+  type: "CLIPTextEncode",
+  // ... other properties
+}
+```
+
+### Common Story Variants
+
+Always include these story variants when applicable:
+
+- **Default**: Basic component with minimal props
+- **WithData**: Component with realistic data
+- **Loading**: Component in loading state
+- **Error**: Component with error state
+- **LongContent**: Component with edge case content
+- **Empty**: Component with no data
+
+### Storybook-Specific Code Patterns
+
+#### Store Access
+```typescript
+// In stories, access stores through the setup function
+export const WithStore: Story = {
+  render: () => ({
+    setup() {
+      const store = useMyStore()
+      return { store }
+    },
+    template: '<MyComponent :data="store.data" />'
+  })
+}
+```
+
+#### Event Testing
+```typescript
+export const WithEvents: Story = {
+  args: {
+    onUpdate: fn() // Use Storybook's fn() for action logging
+  }
+}
+```
+
+## Configuration Notes
+
+### Vue App Setup
+The Storybook preview is configured with:
+- Pinia stores initialized
+- PrimeVue with ComfyUI theme
+- i18n internationalization
+- All necessary CSS imports
+
+### Build Configuration
+- Vite integration with proper alias resolution
+- Manual chunking for better performance
+- TypeScript support with strict checking
+- CSS processing for Vue components
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Import Errors**: Verify `@/` alias is working correctly
+2. **Missing Styles**: Ensure CSS imports are in `preview.ts`
+3. **Store Errors**: Check store initialization in setup
+4. **Type Errors**: Use proper TypeScript types for story args
+
+### Debug Commands
+
+```bash
+# Check TypeScript issues
+npm run typecheck
+
+# Lint Storybook files
+npm run lint .storybook/
+
+# Build to check for production issues
+npm run build-storybook
+```
+
+## File Organization
+
+```
+.storybook/
+├── main.ts          # Core configuration
+├── preview.ts       # Global setup and decorators
+├── README.md        # User documentation
+└── CLAUDE.md        # This file - Claude guidelines
+
+src/
+├── components/
+│   └── MyComponent/
+│       ├── MyComponent.vue
+│       └── MyComponent.stories.ts
+```
+
+## Integration with ComfyUI
+
+### Available Context
+
+Stories have access to:
+- All ComfyUI stores (widgetStore, colorPaletteStore, etc.)
+- PrimeVue components with ComfyUI theming
+- Internationalization system
+- ComfyUI CSS variables and styling
+
+### Testing Components
+
+When testing ComfyUI-specific components:
+1. Use realistic node definitions and data structures
+2. Test with different node types (sampling, conditioning, etc.)
+3. Verify proper CSS theming and dark/light modes
+4. Check component behavior with various input combinations
+
+### Performance Considerations
+
+- Use manual chunking for large dependencies
+- Minimize bundle size by avoiding unnecessary imports
+- Leverage Storybook's lazy loading capabilities
+- Profile build times and optimize as needed
+
+## Best Practices
+
+1. **Keep Stories Focused**: Each story should demonstrate one specific use case
+2. **Use Descriptive Names**: Story names should clearly indicate what they show
+3. **Document Complex Props**: Use JSDoc comments for complex prop types
+4. **Test Edge Cases**: Create stories for unusual but valid use cases
+5. **Maintain Consistency**: Follow established patterns in existing stories

.storybook/README.md

@@ -0,0 +1,148 @@
+# Storybook Configuration for ComfyUI Frontend
+
+## What is Storybook?
+
+Storybook is a frontend workshop for building UI components and pages in isolation. It allows developers to:
+
+- Build components independently from the main application
+- Test components with different props and states
+- Document component APIs and usage patterns
+- Share components across teams and projects
+- Catch visual regressions through visual testing
+
+## Storybook vs Other Testing Tools
+
+| Tool | Purpose | Use Case |
+|------|---------|----------|
+| **Storybook** | Component isolation & documentation | Developing, testing, and showcasing individual UI components |
+| **Playwright** | End-to-end testing | Full user workflow testing across multiple pages |
+| **Vitest** | Unit testing | Testing business logic, utilities, and component behavior |
+| **Vue Testing Library** | Component testing | Testing component interactions and DOM output |
+
+### When to Use Storybook
+
+**✅ Use Storybook for:**
+- Developing new UI components in isolation
+- Creating component documentation and examples
+- Testing different component states and props
+- Sharing components with designers and stakeholders
+- Visual regression testing
+- Building a component library or design system
+
+**❌ Don't use Storybook for:**
+- Testing complex user workflows (use Playwright)
+- Testing business logic (use Vitest)
+- Integration testing between components (use Vue Testing Library)
+
+## How to Use Storybook
+
+### Development Commands
+
+```bash
+# Start Storybook development server
+npm run storybook
+
+# Build static Storybook for deployment
+npm run build-storybook
+```
+
+### Creating Stories
+
+Stories are located alongside components in `src/` directories with the pattern `*.stories.ts`:
+
+```typescript
+// MyComponent.stories.ts
+import type { Meta, StoryObj } from '@storybook/vue3'
+import MyComponent from './MyComponent.vue'
+
+const meta: Meta<typeof MyComponent> = {
+  title: 'Components/MyComponent',
+  component: MyComponent,
+  parameters: {
+    layout: 'centered'
+  }
+}
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {
+  args: {
+    title: 'Hello World'
+  }
+}
+
+export const WithVariant: Story = {
+  args: {
+    title: 'Variant Example',
+    variant: 'secondary'
+  }
+}
+```
+
+### Available Features
+
+- **Vue 3 Support**: Full Vue 3 composition API and reactivity
+- **PrimeVue Integration**: All PrimeVue components and theming
+- **ComfyUI Theming**: Custom ComfyUI theme preset applied
+- **Pinia Stores**: Access to application stores for components that need state
+- **TypeScript**: Full TypeScript support with proper type checking
+- **CSS/SCSS**: Component styling support
+- **Auto-documentation**: Automatic prop tables and component documentation
+
+## Development Tips
+
+### Best Practices
+
+1. **Keep Stories Simple**: Each story should demonstrate one specific use case
+2. **Use Realistic Data**: Use data that resembles real application usage
+3. **Document Edge Cases**: Create stories for loading states, errors, and edge cases
+4. **Group Related Stories**: Use consistent naming and grouping for related components
+
+### Component Testing Strategy
+
+```typescript
+// Example: Testing different component states
+export const Loading: Story = {
+  args: {
+    isLoading: true
+  }
+}
+
+export const Error: Story = {
+  args: {
+    error: 'Failed to load data'
+  }
+}
+
+export const WithLongText: Story = {
+  args: {
+    description: 'Very long description that might cause layout issues...'
+  }
+}
+```
+
+### Debugging Tips
+
+- Use browser DevTools to inspect component behavior
+- Check the Storybook console for Vue warnings or errors
+- Use the Controls addon to dynamically change props
+- Leverage the Actions addon to test event handling
+
+## Configuration Files
+
+- **`main.ts`**: Core Storybook configuration and Vite integration
+- **`preview.ts`**: Global decorators, parameters, and Vue app setup
+- **`manager.ts`**: Storybook UI customization (if needed)
+
+## Integration with ComfyUI
+
+This Storybook setup includes:
+
+- ComfyUI-specific theming and styling
+- Pre-configured Pinia stores for state management
+- Internationalization (i18n) support
+- PrimeVue component library integration
+- Proper alias resolution for `@/` imports
+
+For component-specific examples, see the NodePreview stories in `src/components/node/`.