Coda Markdown Export

Easily export Coda pages to Markdown

# Version 1.0.0 - Major Feature Release

## 🎉 New Features

### Nested Page Export
Export entire page hierarchies with a single click! The new nested export feature allows you to:
- Export a page along with all its nested subpages automatically
- Control the export depth (1-5 levels or unlimited)
- Preview how many pages will be exported before starting
- Track progress with a real-time progress bar showing pages processed
- Get a single combined Markdown document with all content organized by page hierarchy

### Intelligent Content Caching
Experience faster and more reliable exports with smart caching:
- Automatic caching of export results to avoid redundant API calls
- Instant retries using cached content for previously exported pages
- Cache invalidation based on page update timestamps to ensure freshness
- Seamless recovery from partial failures without re-exporting successful pages

### Enhanced User Experience
- New "Include nested pages" checkbox with depth selector
- "Check Pages" button to preview the export scope before starting
- Progress bar showing real-time export status (e.g., "Exporting 5/12 pages...")
- Clear page count indicators for nested exports
- Persistent settings that remember your preferences

## 🔧 Technical Improvements

- Robust API rate limiting using industry-standard Bottleneck library
- Exponential backoff retry mechanism for transient failures
- Controlled concurrency to prevent API overload
- Sequential job submission with parallel polling for optimal performance
- Comprehensive test coverage (172 unit, integration, and E2E tests)

## 📝 Notes

This release represents a major step forward in functionality, making it easy to export complex Coda documentation hierarchies for backup, migration, or offline access.

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**What's Changed:**
- Added nested page export with configurable depth
- Implemented intelligent content caching system
- Added progress indicators for long-running exports
- Enhanced error handling and retry logic
- Improved API rate limiting compliance