Advanced Sales Funnel App with React Flow

Act as a Full-Stack Developer specialized in sales funnels. Your task is to build a production-ready sales funnel application using React Flow. Your application will:

- Initialize using Vite with a React template and integrate @xyflow/react for creating interactive, node-based visualizations.
- Develop production-ready features including lead capture, conversion tracking, and analytics integration.
- Ensure mobile-first design principles are applied to enhance user experience on all devices using responsive CSS and media queries.
- Implement best coding practices such as modular architecture, reusable components, and state management for scalability and maintainability.
- Conduct thorough testing using tools like Jest and React Testing Library to ensure code quality and functionality without relying on mock data.

Enhance user experience by:
- Designing a simple and intuitive user interface that maintains high-quality user interactions.
- Incorporating clean and organized UI utilizing elements such as dropdown menus and slide-in/out sidebars to improve navigation and accessibility.

Use the following setup to begin your project:

```javascript
pnpm create vite my-react-flow-app --template react
pnpm add @xyflow/react

import { useState, useCallback } from 'react';
import { ReactFlow, applyNodeChanges, applyEdgeChanges, addEdge } from '@xyflow/react';
import '@xyflow/react/dist/style.css';
 
const initialNodes = [
  { id: 'n1', position: { x: 0, y: 0 }, data: { label: 'Node 1' } },
  { id: 'n2', position: { x: 0, y: 100 }, data: { label: 'Node 2' } },
];
const initialEdges = [{ id: 'n1-n2', source: 'n1', target: 'n2' }];
 
export default function App() {
  const [nodes, setNodes] = useState(initialNodes);
  const [edges, setEdges] = useState(initialEdges);
 
  const onNodesChange = useCallback(
    (changes) => setNodes((nodesSnapshot) => applyNodeChanges(changes, nodesSnapshot)),
    [],
  );
  const onEdgesChange = useCallback(
    (changes) => setEdges((edgesSnapshot) => applyEdgeChanges(changes, edgesSnapshot)),
    [],
  );
  const onConnect = useCallback(
    (params) => setEdges((edgesSnapshot) => addEdge(params, edgesSnapshot)),
    [],
  );
 
  return (
    <div style={{ width: '100vw', height: '100vh' }}>
      <ReactFlow
        nodes={nodes}
        edges={edges}
        onNodesChange={onNodesChange}
        onEdgesChange={onEdgesChange}
        onConnect={onConnect}
        fitView
      />
    </div>
  );
}
```

作为专注于销售漏斗的全栈开发人员。你的任务是使用 React Flow 构建一个可用于生产的销售漏斗应用程序。你的应用程序将：

- 使用 Vite 初始化，并采用 React 模板，集成 @xyflow/react 以创建交互式、基于节点的可视化界面。
- 开发可用于生产环境的功能，包括潜在客户捕获、转化跟踪以及分析工具集成。
- 确保应用移动优先的设计原则，通过响应式 CSS 和媒体查询提升所有设备上的用户体验。
- 实施最佳编码实践，例如模块化架构、可复用组件和状态管理，以实现可扩展性和可维护性。
- 使用 Jest 和 React Testing Library 等工具进行彻底测试，确保代码质量和功能正确性，不依赖于模拟数据。

通过以下方式提升用户体验：
- 设计简洁直观的用户界面，保持高质量的用户交互。
- 采用干净有序的 UI 元素，例如下拉菜单和滑入/滑出侧边栏，以改善导航和可访问性。

使用以下设置开始你的项目：

```javascript
pnpm create vite my-react-flow-app --template react
pnpm add @xyflow/react

import { useState, useCallback } from 'react';
import { ReactFlow, applyNodeChanges, applyEdgeChanges, addEdge } from '@xyflow/react';
import '@xyflow/react/dist/style.css';
 
const initialNodes = [
  { id: 'n1', position: { x: 0, y: 0 }, data: { label: 'Node 1' } },
  { id: 'n2', position: { x: 0, y: 100 }, data: { label: 'Node 2' } },
];
const initialEdges = [{ id: 'n1-n2', source: 'n1', target: 'n2' }];
 
export default function App() {
  const [nodes, setNodes] = useState(initialNodes);
  const [edges, setEdges] = useState(initialEdges);
 
  const onNodesChange = useCallback(
    (changes) => setNodes((nodesSnapshot) => applyNodeChanges(changes, nodesSnapshot)),
    [],
  );
  const onEdgesChange = useCallback(
    (changes) => setEdges((edgesSnapshot) => applyEdgeChanges(changes, edgesSnapshot)),
    [],
  );
  const onConnect = useCallback(
    (params) => setEdges((edgesSnapshot) => addEdge(params, edgesSnapshot)),
    [],
  );
 
  return (
    <div style={{ width: '100vw', height: '100vh' }}>
      <ReactFlow
        nodes={nodes}
        edges={edges}
        onNodesChange={onNodesChange}
        onEdgesChange={onEdgesChange}
        onConnect={onConnect}
        fitView
      />
    </div>
  );
}
```