feat(FN-002): complete Step 2 — React Frontend App Skeleton

apps/web/src/App.css

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+.app {
+  display: flex;
+  flex-direction: column;
+  min-height: 100dvh;
+}
+
+.app-header {
+  padding: 2rem;
+  text-align: center;
+  border-bottom: 1px solid rgba(255,255,255,0.08);
+}
+
+.app-header h1 {
+  margin: 0;
+  font-size: 2.5rem;
+  color: var(--accent);
+}
+
+.tagline {
+  margin: 0.5rem 0 0;
+  opacity: 0.8;
+}
+
+.app-main {
+  flex: 1;
+  padding: 2rem;
+  display: flex;
+  justify-content: center;
+  align-items: flex-start;
+}
+
+.status-card {
+  background: rgba(255,255,255,0.04);
+  border: 1px solid rgba(255,255,255,0.08);
+  border-radius: 0.75rem;
+  padding: 1.5rem 2rem;
+  min-width: 280px;
+}
+
+.status-card h2 {
+  margin: 0 0 1rem;
+  font-size: 1.25rem;
+}
+
+.status-row {
+  display: flex;
+  justify-content: space-between;
+  padding: 0.5rem 0;
+  border-bottom: 1px solid rgba(255,255,255,0.06);
+}
+
+.status-row:last-child {
+  border-bottom: none;
+}
+
+.status-label {
+  opacity: 0.7;
+}
+
+.status-value {
+  font-weight: 500;
+}
+
+.app-footer {
+  padding: 1rem 2rem;
+  text-align: center;
+  opacity: 0.5;
+  font-size: 0.875rem;
+  border-top: 1px solid rgba(255,255,255,0.08);
+}

apps/web/src/App.tsx

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+import './App.css'
+
+function App() {
+  return (
+    <div className="app">
+      <header className="app-header">
+        <h1>Headquarter</h1>
+        <p className="tagline">Hosted workspace and tool-orchestration platform</p>
+      </header>
+      <main className="app-main">
+        <section className="status-card">
+          <h2>Platform Status</h2>
+          <div className="status-row">
+            <span className="status-label">API</span>
+            <span className="status-value" data-testid="api-status">Checking…</span>
+          </div>
+          <div className="status-row">
+            <span className="status-label">Version</span>
+            <span className="status-value">0.0.1</span>
+          </div>
+        </section>
+      </main>
+      <footer className="app-footer">
+        <p>Scaffolded by FN-002</p>
+      </footer>
+    </div>
+  )
+}
+
+export default App

apps/web/src/__tests__/App.test.tsx

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+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import App from '../App'
+
+describe('App', () => {
+  it('renders the platform name', () => {
+    render(<App />)
+    expect(screen.getByText('Headquarter')).toBeInTheDocument()
+  })
+
+  it('renders the tagline', () => {
+    render(<App />)
+    expect(screen.getByText('Hosted workspace and tool-orchestration platform')).toBeInTheDocument()
+  })
+
+  it('renders the platform status section', () => {
+    render(<App />)
+    expect(screen.getByText('Platform Status')).toBeInTheDocument()
+    expect(screen.getByTestId('api-status')).toHaveTextContent('Checking…')
+  })
+
+  it('renders the scaffold footer', () => {
+    render(<App />)
+    expect(screen.getByText('Scaffolded by FN-002')).toBeInTheDocument()
+  })
+})

apps/web/src/__tests__/setup.ts

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+import '@testing-library/jest-dom/vitest'

apps/web/src/index.css

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+:root {
+  --bg: #0f172a;
+  --fg: #e2e8f0;
+  --accent: #38bdf8;
+  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
+  line-height: 1.5;
+  color-scheme: dark;
+}
+
+body {
+  margin: 0;
+  background: var(--bg);
+  color: var(--fg);
+}
+
+#root {
+  min-height: 100dvh;
+  display: flex;
+  flex-direction: column;
+}

apps/web/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)