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/package.json

@@ -0,0 +1,41 @@
+{
+  "name": "maternal-web",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev -p 3030",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@emotion/react": "^11.14.0",
+    "@emotion/styled": "^11.14.1",
+    "@hookform/resolvers": "^5.2.2",
+    "@mui/icons-material": "^5.18.0",
+    "@mui/material": "^5.18.0",
+    "@mui/material-nextjs": "^7.3.2",
+    "@reduxjs/toolkit": "^2.9.0",
+    "@tanstack/react-query": "^5.90.2",
+    "axios": "^1.12.2",
+    "date-fns": "^4.1.0",
+    "framer-motion": "^11.18.2",
+    "next": "14.2.0",
+    "next-pwa": "^5.6.0",
+    "react": "^18",
+    "react-dom": "^18",
+    "react-hook-form": "^7.63.0",
+    "react-redux": "^9.2.0",
+    "redux-persist": "^6.0.0",
+    "socket.io-client": "^4.8.1",
+    "zod": "^3.25.76"
+  },
+  "devDependencies": {
+    "@types/node": "^20",
+    "@types/react": "^18",
+    "@types/react-dom": "^18",
+    "postcss": "^8",
+    "tailwindcss": "^3.4.1",
+    "typescript": "^5"
+  }
+}