[NathanWalker]

Split out of #77 (item 1 of the "NativeScript bugs" list in ng-native/ng-native#931).

Summary

A recycled NativeScriptUIView stayed empty when it was remounted with the handle it last showed. Fabric keeps _props across prepareForRecycle, while the container is cleared, so diffing against _props saw no handle change and never re-attached the view.

 updateProps(props, oldProps)
-  old = _props
+  old = oldProps ?? defaultProps   // RCTMountingManager passes nullptr on a fresh mount
   if old.nativeViewHandle != new.nativeViewHandle
     setNativeViewHandle(new)

_props itself is left alone, because RN's own prepareForRecycle diffs layer state against it.

Evidence

iOS 26.5 simulator, Debug, RN 0.86.3 / Expo. The same commit was tested in #77, cherry-picked here unchanged.

• Before: unmount and remount a NativeScriptUIView with the same handle, and the red view does not come back (superview is nil).
• After: the red view returns and superview is set.

Merge Danger

Door: two-way

Blast Radius: iOS NativeScriptUIView only

A fresh mount passes oldProps == nullptr, which now maps to the default props, so first mounts attach exactly as before.

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