The JavaScript was executing scrollIntoView() but the WebView itself cannot
scroll (isScrollEnabled = false). Fixed by calculating the annotation's Y
position in the WebView and scrolling the outer ScrollView to the correct
position instead.
Changes:
- WebView.swift: Added onScrollToPosition callback and scrollToPosition
message handler. JavaScript now calculates and sends annotation position
to Swift instead of using scrollIntoView().
- NativeWebView.swift: Same changes for iOS 26+ with polling mechanism for
window.__pendingScrollPosition.
- BookmarkDetailLegacyView.swift: Implemented onScrollToPosition callback
that calculates final scroll position (header height + annotation position)
and scrolls the outer ScrollView.
- BookmarkDetailView2.swift: Same implementation as BookmarkDetailLegacyView.
