Add app folder for component dev and demos

Author: jschuler

.github/workflows/deploy-demo.yml

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+name: Deploy Demo App to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: '.nvmrc'
+          cache: npm
+          cache-dependency-path: |
+            package-lock.json
+            app/package-lock.json
+
+      - name: Install root dependencies
+        run: npm ci
+
+      - name: Build library
+        run: npm run build
+
+      - name: Install app dependencies
+        working-directory: ./app
+        run: npm ci
+
+      - name: Build demo app
+        working-directory: ./app
+        run: npm run build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./app/dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+

app/.prettierignore

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+# Dependencies
+node_modules
+
+# Build outputs
+dist
+build
+
+# Logs
+*.log
+
+# OS
+.DS_Store
+

app/.prettierrc

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+{
+  "semi": true,
+  "trailingComma": "es5",
+  "singleQuote": false,
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "arrowParens": "always",
+  "endOfLine": "lf"
+}
+

app/README.md

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+# Next Gen UI — Demo App
+
+This demo app loads the local `next-gen-ui-react` components for development and testing.
+
+## 🌐 Live Demo
+
+The demo app is automatically deployed to GitHub Pages:
+**https://redhat-ux.github.io/next-gen-ui-react/**
+
+The deployment happens automatically on every push to the `main` branch.
+
+## Quick Start
+
+1. From the repo root, install dependencies for the demo:
+
+```bash
+cd app
+npm install
+```
+
+2. Start the dev server:
+
+```bash
+npm run dev
+```
+
+3. Open the app at http://localhost:5176
+
+## Architecture
+
+The demo app uses a **component registry pattern** to make it easy to add and manage component demonstrations.
+
+### Key Files
+
+- **`src/config/componentRegistry.ts`** - Central registry of all components
+- **`src/demo/demoData.ts`** - Demo data for all components
+- **`src/pages/`** - Individual component demo pages
+- **`src/layout/Sidebar.tsx`** - Auto-generated navigation
+- **`src/App.tsx`** - Routes and layout
+
+### How It Works
+
+The component registry (`componentRegistry.ts`) is the single source of truth for:
+- Component names and paths
+- GitHub source code links
+- Demo examples and data
+- Navigation structure
+
+When you add a component to the registry, it automatically appears in:
+- ✅ Sidebar navigation
+- ✅ Home page links
+- ✅ Page titles
+- ✅ Source code links
+
+## Adding a New Component Demo
+
+### Step 1: Add Demo Data
+
+In `src/demo/demoData.ts`, add your demo data:
+
+```typescript
+export const myNewComponentDemo = {
+  component: "my-component" as const,
+  id: "demo-1",
+  title: "Example Title",
+  // ... your component props
+};
+
+// Add variations if you want multiple examples
+export const myNewComponentDemoVariation = {
+  component: "my-component" as const,
+  id: "demo-2",
+  title: "Variation Example",
+  // ... variant props
+};
+```
+
+### Step 2: Register in Component Registry
+
+In `src/config/componentRegistry.ts`, add an entry to the `componentRegistry` array:
+
+```typescript
+{
+  id: "mynewcomponent",           // Unique ID
+  name: "MyNewComponent",         // Display name
+  path: "/mynewcomponent",        // Route path
+  sourceUrl: "https://github.com/RedHat-UX/next-gen-ui-react/blob/main/src/components/MyNewComponent.tsx",
+  componentImportPath: "@local-lib/components/MyNewComponent",
+  examples: [
+    { title: "Basic Example", data: myNewComponentDemo },
+    { title: "Variation", data: myNewComponentDemoVariation },
+  ],
+}
+```
+
+### Step 3: Create Component Page
+
+Create `src/pages/MyNewComponent.tsx`:
+
+```typescript
+import MyNewComponent from "@local-lib/components/MyNewComponent";
+import {
+  CodeBlock,
+  CodeBlockCode,
+  Content,
+  ContentVariants,
+  Divider,
+} from "@patternfly/react-core";
+
+import { myNewComponentDemo, myNewComponentDemoVariation } from "../demo/demoData";
+
+export default function MyNewComponentPage() {
+  return (
+    <div>
+      {/* First Example */}
+      <Content component={ContentVariants.h3}>Basic Example</Content>
+      <MyNewComponent {...myNewComponentDemo} />
+      <Content component={ContentVariants.h4} style={{ marginTop: 16 }}>
+        Props
+      </Content>
+      <CodeBlock>
+        <CodeBlockCode>
+          {JSON.stringify(myNewComponentDemo, null, 2)}
+        </CodeBlockCode>
+      </CodeBlock>
+
+      {/* Divider between examples */}
+      <Divider style={{ marginTop: 32, marginBottom: 32 }} />
+
+      {/* Second Example */}
+      <Content component={ContentVariants.h3}>Variation</Content>
+      <MyNewComponent {...myNewComponentDemoVariation} />
+      <Content component={ContentVariants.h4} style={{ marginTop: 16 }}>
+        Props
+      </Content>
+      <CodeBlock>
+        <CodeBlockCode>
+          {JSON.stringify(myNewComponentDemoVariation, null, 2)}
+        </CodeBlockCode>
+      </CodeBlock>
+    </div>
+  );
+}
+```
+
+### Step 4: Add Route
+
+In `src/App.tsx`, import and add the route:
+
+```typescript
+// Add import
+import MyNewComponentPage from "./pages/MyNewComponent";
+
+// Add route in the Routes section
+<Route path="/mynewcomponent" element={<MyNewComponentPage />} />
+```
+
+**That's it!** The component will automatically appear in:
+- Sidebar navigation
+- Home page links
+- Page title header
+- Source code link
+
+## Project Structure
+
+```
+app/
+├── src/
+│   ├── config/
+│   │   └── componentRegistry.ts    ← Register components here
+│   ├── demo/
+│   │   └── demoData.ts             ← Add demo data here
+│   ├── layout/
+│   │   └── Sidebar.tsx             ← Auto-generated from registry
+│   ├── pages/
+│   │   ├── Home.tsx                ← Auto-generated links
+│   │   ├── DynamicComponents.tsx   ← Example page
+│   │   └── ...                     ← Add new pages here
+│   ├── App.tsx                     ← Add routes here
+│   └── main.tsx
+├── package.json
+├── vite.config.ts
+└── README.md                       ← You are here
+```
+
+## Available Scripts
+
+```bash
+npm run dev            # Start development server
+npm run build          # Build for production (GitHub Pages)
+npm run build:netlify  # Build for Netlify/Vercel (root path)
+npm run preview        # Preview production build
+npm run lint           # Run ESLint
+npm run lint:fix       # Auto-fix ESLint issues
+npm run format         # Format with Prettier
+npm run format:check   # Check formatting
+```
+
+## Deployment
+
+The demo app can be deployed to multiple platforms.
+
+### GitHub Pages (Automatic)
+
+The demo app is automatically deployed to GitHub Pages via GitHub Actions.
+
+**Deployment happens automatically when:**
+- Code is pushed to the `main` branch
+- The workflow can also be triggered manually from the Actions tab
+
+**Manual Deployment:**
+1. Go to the repository's **Actions** tab on GitHub
+2. Select the **Deploy Demo App to GitHub Pages** workflow
+3. Click **Run workflow**
+
+**How It Works:**
+
+The deployment workflow (`.github/workflows/deploy-demo.yml`):
+1. Builds the library (`npm run build` in root)
+2. Installs app dependencies
+3. Builds the demo app with production settings
+4. Deploys the `app/dist` folder to GitHub Pages
+
+**GitHub Pages Settings:**
+
+To enable GitHub Pages for the first time:
+1. Go to repository **Settings** → **Pages**
+2. Under **Source**, select **GitHub Actions**
+3. The app will be available at `https://redhat-ux.github.io/next-gen-ui-react/`
+
+### Netlify/Vercel (Manual)
+
+For one-time or manual deployments to Netlify, Vercel, or similar platforms:
+
+**Build for Netlify/Vercel:**
+```bash
+cd app
+npm run build:netlify
+```
+
+**Deploy the `dist` folder:**
+- **Netlify Drop:** Drag `app/dist` to https://app.netlify.com/drop
+- **Vercel CLI:** Run `npx vercel dist --prod` from the `app` directory
+
+**Note:** Use `build:netlify` instead of `build` when deploying to platforms that serve from the root path (not a subdirectory).
+
+## Linting and Formatting
+
+This project uses:
+- **ESLint** for code quality and catching bugs
+- **Prettier** for code formatting
+- Import ordering rules for consistent imports
+
+All code is automatically checked and formatted. The linter enforces:
+- TypeScript best practices
+- React hooks rules
+- Import ordering (external → internal → relative)
+- No unused variables
+
+## Development Notes
+
+- The demo imports components directly from the parent package source using a Vite alias `@local-lib`
+- Changes to library code in `../src/components` will hot-reload automatically
+- If you run into duplicate React instances or hooks errors, set `resolve.preserveSymlinks = true` in your Vite config
+- The app runs on port 5176 by default (configured in `vite.config.ts`)
+
+## Component Demo Best Practices
+
+1. **Multiple Examples** - Show different variations and use cases
+2. **Descriptive Titles** - Use clear, specific titles for each example
+3. **Props Display** - Always show the props JSON for reference
+4. **Visual Separation** - Use `Divider` between multiple examples
+5. **Realistic Data** - Use meaningful, realistic demo data
+6. **Type Safety** - Use `as const` for literal types
+
+## Tips
+
+- Keep demo data in `demoData.ts` separate from page components
+- Use the registry pattern - don't hardcode navigation or links
+- Follow the established page component pattern for consistency
+- Test your component in different scenarios (with/without optional props)
+- Add comments to complex demo data explaining what it demonstrates
+
+## Need Help?
+
+- Check existing component pages for patterns to follow
+- Look at `src/config/componentRegistry.ts` to see how other components are registered
+- Run `npm run lint` before committing to catch issues early