fix scroll header jumping on profiles with large headers

modules/expo-scroll-forwarder/ios/ExpoScrollForwarderView.swift

@@ -76,11 +76,10 @@ class ExpoScrollForwarderView: ExpoView, UIGestureRecognizerDelegate {
     let translation = sender.translation(in: self).y
 
     if sender.state == .began {
-      if sv.contentOffset.y < 0 {
-        sv.contentOffset.y = 0
-      }
-
-      self.initialOffset = sv.contentOffset.y
+      // Use max(0) so gesture deltas compute correctly, but don't mutate
+      // contentOffset — snapping it to 0 causes a visible jump on profiles
+      // with large headers where the user is scrolled into negative territory.
+      self.initialOffset = max(sv.contentOffset.y, 0)
     }
 
     if sender.state == .changed {