Implement comprehensive release notes feature:
- RELEASE_NOTES.md with version 1.0 and 1.1 content in English
- VersionManager to track app versions and detect updates
- ReleaseNotesView with native markdown rendering
- Auto-popup sheet on first launch after version update
- Manual access via "What's New" button in General Settings
Features:
- Markdown-based release notes stored in app bundle
- Automatic version detection using CFBundleShortVersionString
- UserDefaults tracking of last seen version
- Dismissable sheet with "Done" button
- Settings button shows current version number
Technical implementation:
- VersionManager singleton for version tracking
- Sheet presentation in MainTabView on new version
- Settings integration with sparkles icon
- Native SwiftUI Text markdown rendering
- Bundle resource loading for RELEASE_NOTES.md
Release notes content:
- Version 1.1: iOS 26 features, floating buttons, progress tracking
- Version 1.0: Initial release features and capabilities