Add Phase 2 & 3: Web frontend with authentication and tracking features

- Initialize Next.js 14 web application with Material UI and TypeScript
- Implement authentication (login/register) with device fingerprint
- Create mobile-first responsive layout with app shell pattern
- Add tracking pages for feeding, sleep, and diaper changes
- Implement activity history with filtering
- Configure backend CORS for web frontend (port 3030)
- Update backend port to 3020, frontend to 3030
- Fix API response handling for auth endpoints

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

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

maternal-web/next.config.mjs

@@ -0,0 +1,30 @@
+import withPWA from 'next-pwa';
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+  images: {
+    domains: ['api.maternalapp.com', 'localhost'],
+  },
+};
+
+const pwaConfig = withPWA({
+  dest: 'public',
+  register: true,
+  skipWaiting: true,
+  disable: process.env.NODE_ENV === 'development',
+  runtimeCaching: [
+    {
+      urlPattern: /^https?.*/,
+      handler: 'NetworkFirst',
+      options: {
+        cacheName: 'offlineCache',
+        expiration: {
+          maxEntries: 200,
+        },
+      },
+    },
+  ],
+});
+
+export default pwaConfig(nextConfig);