feat: add ProductCard and ServiceCard components

Implement ProductCard component with:
- Renders product details (name, price, description)
- "Ask about this" button disabled when out of stock
- Shows "Currently unavailable" badge when out of stock
- Calls onInquire callback when clicked

Implement ServiceCard component with:
- Renders service details (name, formatted duration, price)
- Clickable button card that calls onSelect with service id
- formatDuration helper for human-readable time format

Both components include CSS modules with hover effects and proper styling.
All 4 tests pass (2 for each component).

Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH

src/components/ProductCard.module.css

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+.card {
+  background: var(--color-cream-alt);
+  border-radius: 4px;
+  padding: var(--space-md);
+  transition: transform 0.25s ease;
+}
+
+.card:hover {
+  transform: translateY(-6px) rotateX(2deg);
+}
+
+.badge {
+  color: #a0453a;
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  letter-spacing: 1px;
+}
+
+.button {
+  background: var(--color-charcoal);
+  color: var(--color-cream);
+  border: none;
+  padding: 0.6rem 1.2rem;
+  font-size: 0.75rem;
+  letter-spacing: 1px;
+  text-transform: uppercase;
+  cursor: pointer;
+}
+
+.button:disabled {
+  background: #b7ada3;
+  cursor: not-allowed;
+}

src/components/ProductCard.test.tsx

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+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, it, expect, vi } from 'vitest'
+import ProductCard from './ProductCard'
+import type { Product } from '../data/products'
+
+const product: Product = {
+  id: 'edge-control', name: 'Silk Edge Control', category: 'hair-care',
+  price: 12, image: '/x.jpg', description: 'Hold with shine.', inStock: true,
+}
+
+describe('ProductCard', () => {
+  it('renders product details and calls onInquire when clicked', async () => {
+    const onInquire = vi.fn()
+    render(<ProductCard product={product} onInquire={onInquire} />)
+    expect(screen.getByText('Silk Edge Control')).toBeInTheDocument()
+    expect(screen.getByText('$12')).toBeInTheDocument()
+    await userEvent.click(screen.getByRole('button', { name: /ask about this/i }))
+    expect(onInquire).toHaveBeenCalledWith(product)
+  })
+
+  it('disables the inquire button when out of stock', () => {
+    const onInquire = vi.fn()
+    render(<ProductCard product={{ ...product, inStock: false }} onInquire={onInquire} />)
+    expect(screen.getByRole('button', { name: /ask about this/i })).toBeDisabled()
+    expect(screen.getByText(/unavailable/i)).toBeInTheDocument()
+  })
+})

src/components/ProductCard.tsx

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+import type { Product } from '../data/products'
+import styles from './ProductCard.module.css'
+
+interface ProductCardProps {
+  product: Product
+  onInquire: (product: Product) => void
+}
+
+function ProductCard({ product, onInquire }: ProductCardProps) {
+  return (
+    <div className={styles.card}>
+      <h3>{product.name}</h3>
+      <p>${product.price}</p>
+      <p>{product.description}</p>
+      {!product.inStock && <p className={styles.badge}>Currently unavailable</p>}
+      <button
+        type="button"
+        className={styles.button}
+        disabled={!product.inStock}
+        onClick={() => onInquire(product)}
+      >
+        Ask about this
+      </button>
+    </div>
+  )
+}
+
+export default ProductCard

src/components/ServiceCard.module.css

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+.card {
+  background: var(--color-cream-alt);
+  border-radius: 4px;
+  padding: var(--space-md);
+  min-width: 160px;
+  text-align: center;
+  border: none;
+  cursor: pointer;
+  transition: transform 0.25s ease;
+  font-family: var(--font-serif);
+}
+
+.card:hover {
+  transform: translateY(-6px) rotateX(2deg);
+}

src/components/ServiceCard.test.tsx

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+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, it, expect, vi } from 'vitest'
+import ServiceCard from './ServiceCard'
+import type { Service } from '../data/services'
+
+const service: Service = {
+  id: 'knotless', name: 'Knotless Braids', durationMinutes: 240,
+  priceFrom: 150, description: 'Tension-free braids.', image: '/x.jpg',
+}
+
+describe('ServiceCard', () => {
+  it('renders service details', () => {
+    render(<ServiceCard service={service} />)
+    expect(screen.getByText('Knotless Braids')).toBeInTheDocument()
+    expect(screen.getByText(/from \$150/i)).toBeInTheDocument()
+    expect(screen.getByText('4h')).toBeInTheDocument()
+  })
+
+  it('calls onSelect with the service id when clicked', async () => {
+    const onSelect = vi.fn()
+    render(<ServiceCard service={service} onSelect={onSelect} />)
+    await userEvent.click(screen.getByRole('button'))
+    expect(onSelect).toHaveBeenCalledWith('knotless')
+  })
+})

src/components/ServiceCard.tsx

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+import type { Service } from '../data/services'
+import styles from './ServiceCard.module.css'
+
+interface ServiceCardProps {
+  service: Service
+  onSelect?: (serviceId: string) => void
+}
+
+function formatDuration(minutes: number): string {
+  const hours = Math.floor(minutes / 60)
+  const rest = minutes % 60
+  return rest === 0 ? `${hours}h` : `${hours}h ${rest}m`
+}
+
+function ServiceCard({ service, onSelect }: ServiceCardProps) {
+  return (
+    <button type="button" className={styles.card} onClick={() => onSelect?.(service.id)}>
+      <h3>{service.name}</h3>
+      <p>{formatDuration(service.durationMinutes)}</p>
+      <p>From ${service.priceFrom}</p>
+    </button>
+  )
+}
+
+export default ServiceCard