fixes #329: Add multi-format clipboard support to useCopyToClipboard

[abhichaurasiya2022]

Description

This PR updates the useCopyToClipboard hook to support copying multiple clipboard formats (plain text, HTML, and Markdown) using the modern ClipboardItem API.

Fixes

Fixes #329

Changes

Core Implementation

• Enhanced useCopyToClipboard to accept either a string or an object with multiple format properties (plain, html, markdown)
• Implemented ClipboardItem API support for copying multiple formats simultaneously
• Maintained backward compatibility - existing usage with plain strings continues to work
• Added proper fallback handling for browsers that don't support ClipboardItem

Type Definitions

• Added new ClipboardFormats type to index.d.ts with optional properties for different formats
• Updated function signature to accept string | ClipboardFormats

Documentation

• Updated hook documentation in useCopyToClipboard.mdx with:
  • New description highlighting multi-format support
  • Updated API reference table
  • Enhanced examples demonstrating both plain text and rich content copying
  • Added error handling display in the demo

Testing

The implementation includes:

• Full backward compatibility with existing string-based usage
• Support for modern browsers with ClipboardItem API
• Fallback to writeText for simple string copying
• Legacy fallback using document.execCommand for older browsers

Benefits

• Enables copying rich content (HTML formatting, Markdown) to clipboard
• Applications can provide formatted content that preserves styling when pasted
• No breaking changes - fully backward compatible
• Better user experience with multiple paste format options

[abhichaurasiya2022]

moved to PR #358