Initial public release (v2.1)

This is the first public version of Claude Chat Exporter.

Features:
- One-click export to Markdown format
- Smart scrolling to load all messages
- Code block preservation
- Duplicate detection
- Clean, formatted output

Technical:
- Vanilla JavaScript (no frameworks)
- Zero data collection
- Local processing only
- Requires Firefox 140+ for data consent support

All code is readable and well-documented.