fix(iOS, SplitView): Override the frame with HostView bounds in collapsed mode

ios/gamma/split/RNSSplitScreenController.swift

@@ -92,14 +92,40 @@ public class RNSSplitScreenController: UIViewController {
       return
     }
 
-    let ancestorView = findSplitHostController()?.view
-    assert(
-      ancestorView != nil,
-      "[RNScreens] Expected to find RNSSplitHost component for RNSSplitScreen component"
-    )
+    guard let splitHostController = findSplitHostController(),
+      let ancestorView = splitHostController.view
+    else {
+      assertionFailure(
+        "[RNScreens] Expected to find RNSSplitHost component for RNSSplitScreen component")
+      return
+    }
+
+    var targetFrame = splitScreenComponentView.bounds
+
+    ///
+    /// When a UISplitViewController collapses into a single column, it hides columns and pushes
+    /// them onto a UINavigationController stack. To optimize resources, UIKit
+    /// does NOT update the frames of these off-screen views - they retain their old widths.
+    ///
+    /// When navigating back to a hidden column, UIKit performs the transition animation, but skips calling
+    /// `setFrame:` on our actual component view, relying on AutoLayout to resize the content.
+    ///
+    /// However, Yoga is expecting absolute values. If we rely strictly on the component's current frame
+    /// during this transition, Yoga will receive the stale width and then calculate the layout incorrectly, breaking the UI.
+    ///
+    /// To fix this, if the SplitView is collapsed, we know the column must span the entire screen.
+    /// We preemptively extract the host's bounds and send them as the target frame to the ShadowTree,
+    /// ensuring the column renders at full width.
+    ///
+    if splitHostController.isCollapsed {
+      targetFrame = ancestorView.convert(ancestorView.bounds, to: splitScreenComponentView)
+    }
 
     shadowStateProxy.updateShadowState(
-      ofComponent: splitScreenComponentView, inContextOfAncestorView: ancestorView)
+      ofComponent: splitScreenComponentView,
+      withFrame: targetFrame,
+      inContextOfAncestorView: ancestorView
+    )
   }
 
   ///