njohnson 64db5a19ed Add dynamic file filter to Open dialog
- Add TypeRegistry::supportedExtensions() to extract file extensions
  from loaded XScript definitions by parsing criteria blocks
- Implement File > Open action with QFileDialog
- Generate filter string dynamically from all root type definitions
- Include "All Supported Files" and "All Files" filter options

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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