feat: Add Dark Mode Theme Support

frontend/.eslintrc.json

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+{
+  "extends": ["next/core-web-vitals"],
+  "rules": {
+    "react/no-unescaped-entities": "off"
+  }
+}

frontend/.gitignore

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+# Dependencies
+node_modules
+.pnp
+.pnp.js
+
+# Testing
+coverage
+
+# Next.js
+.next/
+out/
+
+# Production
+build
+dist
+
+# Misc
+.DS_Store
+*.pem
+
+# Debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Local env files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Vercel
+.vercel
+
+# TypeScript
+*.tsbuildinfo
+next-env.d.ts
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+Thumbs.db

frontend/README.md

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+# PrivacyLayer Frontend
+
+Next.js frontend for PrivacyLayer - the first ZK-proof shielded pool on Stellar Soroban.
+
+## Features
+
+- 🌗 **Dark Mode Support** - System preference detection, manual toggle, and localStorage persistence
+- 🔐 **Wallet Integration** - Freighter wallet support for Stellar
+- 🎨 **Modern UI** - Tailwind CSS with CSS variables for theming
+- ⚡ **Performance** - Next.js 14 with App Router
+
+## Getting Started
+
+```bash
+# Install dependencies
+npm install
+
+# Run development server
+npm run dev
+
+# Build for production
+npm run build
+
+# Start production server
+npm start
+```
+
+## Dark Mode
+
+The dark mode implementation includes:
+
+- **System preference detection** - Automatically matches your OS theme
+- **Manual toggle** - Click the sun/moon icon in the header
+- **Keyboard shortcut** - Press `Ctrl+K` (or `Cmd+K` on Mac) to toggle
+- **Persistence** - Your preference is saved in localStorage
+- **No flash** - Script injection prevents flash of unstyled content
+
+## Tech Stack
+
+- [Next.js 14](https://nextjs.org/) - React framework
+- [Tailwind CSS](https://tailwindcss.com/) - Styling
+- [next-themes](https://github.com/pacocoursey/next-themes) - Theme management
+- [Stellar SDK](https://github.com/stellar/js-stellar-sdk) - Stellar integration
+- [Freighter](https://www.freighter.app/) - Wallet connection

frontend/next.config.js

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+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+  images: {
+    domains: [],
+  },
+}
+
+module.exports = nextConfig