Changed headerView from var to func with width parameter, matching LegacyView.
Added .frame(width: width, height: headerHeight) to constrain header image width.
This was the root cause of content overflow - without explicit width on the
header image, the entire ZStack and its children (including title and webview)
could grow beyond viewport width. Now matches LegacyView implementation exactly.
Ilyas Hallak
4595a9b69f