Build: CodeSandbox NEAR Playground

Description

## Overview
Create NEAR-enabled CodeSandbox templates - browser-based NEAR development with zero setup.

## Why This Is High Leverage
Browser-based development = zero friction. Anyone can try NEAR in 30 seconds without installing anything.

## Playground Features

### Sandbox Templates
- Frontend + NEAR integration
- Contract interaction playground
- DeFi simulation
- NFT minting demo

### Live Features
- Testnet connection built-in
- Faucet integration
- Transaction explorer
- Console with NEAR output

## Deliverables
1. **CodeSandbox templates**
2. **Live testnet integration**
3. **Interactive tutorials**
4. **Shareable links**

## Budget: 8 NEAR

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**ACTIVELY HIRING** - This job is ready for immediate award. Submit a detailed proposal with specific deliverables and you'll be selected within 24 hours. Budget is firm and payment releases on delivery acceptance.