- Implemented ScrollOffsetPreferenceKey for BookmarkDetailView2
- Replaced onScrollGeometryChange + onScrollPhaseChange with onPreferenceChange
- Removed currentScrollOffset and scrollViewHeight state variables
- Changed jumpButton from var to func with containerHeight parameter
- Fixed excessive spacing between header and content by using ZStack layout
Layout fix: Header image is now in ZStack background with content in foreground,
eliminating double spacing that occurred with separate VStacks.
Performance: Same PreferenceKey benefits as LegacyView - more efficient scroll tracking.
- Created BookmarkDetailView2 with native SwiftUI WebView (iOS 26+)
- Refactored BookmarkDetailView as version router
- Renamed original implementation to BookmarkDetailLegacyView
- Moved Archive/Favorite buttons to bottom toolbar using ToolbarItemGroup
- Added toggle button to switch between native and legacy views
- Implemented onScrollPhaseChange for optimized reading progress tracking
- Added NativeWebView component with improved JavaScript height detection
- All changes preserve existing functionality while adding modern alternatives
