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A reusable React component that renders an SVG send/paper airplane icon commonly used for submit buttons and messaging interfaces.

## Key Components

- **`SendIconProps`** - Interface defining optional className and fill color props
- **`SendIcon`** - Main functional component that renders the SVG icon with customizable styling

## Usage Example

```typescript
import { SendIcon } from './send-icon';

// Basic usage with default styling
<SendIcon />

// Custom size and color
<SendIcon 
  className="w-8 h-8" 
  fill="#3B82F6" 
/>

// In a button component
<button className="flex items-center gap-2">
  Send Message
  <SendIcon className="w-4 h-4" fill="currentColor" />
</button>

// Accessible form submit button
<button type="submit" aria-label="Send message">
  <SendIcon className="w-5 h-5" fill="white" />
</button>
```

The component uses Tailwind CSS classes by default (`w-6 h-6`) and a dark fill color (`#1A1A1A`). The SVG is optimized with a 24x24 viewBox and includes two path elements that form the paper airplane shape. The `fill` prop allows for easy color customization to match your design system or theme.