Address Copilot review: NaN guard, nil sourceView check, explicit import, fetch restore

- extractVersions: validate rnMinor is not NaN before proceeding
- RNNCommandsHandler: guard against nil sourceView in preview registration
- RNNUIBarButtonItem.h: explicitly import RCTSurfaceDelegate for new arch
- Tests: save/restore global.fetch instead of deleting it

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: yedidyak

ios/RNNCommandsHandler.mm

@@ -212,6 +212,9 @@ - (void)push:(NSString *)componentId
 				view = [[ReactNativeNavigation getBridge].uiManager
 					viewForReactTag:optionsWithDefault.preview.reactTag.get];
 #endif
+                                if (view == nil) {
+                                    return;
+                                }
                                 [rootVc registerForPreviewingWithDelegate:(id)rootVc
                                                                sourceView:view];
             });

ios/RNNUIBarButtonItem.h

@@ -2,7 +2,9 @@
 #import "RNNIconCreator.h"
 #import "RNNReactComponentRegistry.h"
 #import <Foundation/Foundation.h>
-#ifndef RCT_NEW_ARCH_ENABLED
+#ifdef RCT_NEW_ARCH_ENABLED
+#import <React/RCTSurfaceDelegate.h>
+#else
 #import <React/RCTRootView.h>
 #import <React/RCTRootViewDelegate.h>
 #endif

scripts/__tests__/changeReactNativeVersion.test.js

@@ -223,12 +223,15 @@ describe('changeReactNativeVersion', () => {
     });
 
     describe('extractVersions', () => {
+        let originalFetch;
+
         beforeEach(() => {
+            originalFetch = global.fetch;
             global.fetch = jest.fn();
         });
 
         afterEach(() => {
-            delete global.fetch;
+            global.fetch = originalFetch;
         });
 
         it('extracts versions from npm registry response', async () => {

scripts/changeReactNativeVersion.js

@@ -51,6 +51,10 @@ async function extractVersions(rnVersion) {
     const reactVersion = String(reactPeer).replace(/^\^/, '');
     const rnMinor = parseRnMinor(rnVersion);
 
+    if (Number.isNaN(rnMinor)) {
+        throw new Error(`Could not parse minor version from "${rnVersion}"`);
+    }
+
     return { rnVersion, reactVersion, rnMinor };
 }