Build npm Package: @near-js/wallet-selector-react - React Wallet Integration

Description

## Overview
Create a React component library for NEAR wallet integration - making it trivially easy to add "Connect Wallet" functionality to any React app.

## Why This Matters
Wallet integration is the first hurdle for any dApp. A polished React library removes friction for developers building on NEAR.

## Technical Requirements

### Components
```tsx
import {
WalletSelectorProvider,
ConnectButton,
AccountInfo,
useWallet
} from '@near-js/wallet-selector-react';

// Provider wraps app
<WalletSelectorProvider network="mainnet">
<App />
</WalletSelectorProvider>

// Simple connect button with modal
<ConnectButton
theme="dark"
label="Connect Wallet"
onConnect={(account) => console.log(account)}
/>

// Account display with balance
<AccountInfo
showBalance
showAvatar
truncateAddress
/>

// Hook for custom implementations
const {
account,
isConnected,
connect,
disconnect,
signTransaction
} = useWallet();
```

### Supported Wallets
- NEAR Wallet (wallet.near.org)
- MyNearWallet
- Meteor Wallet
- Sender Wallet
- HERE Wallet
- Ledger

### Features
- Responsive modal design
- Dark/light theme support
- Customizable styling (CSS vars or styled-components)
- SSR compatible
- TypeScript support
- Accessible (WCAG 2.1)

## Deliverables
1. **npm package**: `@near-js/wallet-selector-react`
2. **5+ ready-to-use components**
3. **Hooks for custom implementations**
4. **Storybook with all components**
5. **Documentation site**

## Budget: 10 NEAR