fix(shared): avoid false offline detection in React Native

packages/shared/src/__tests__/browser.spec.ts

@@ -194,4 +194,17 @@ describe('isValidBrowserOnline', () => {
 
     expect(isValidBrowserOnline()).toBe(true);
   });
+
+  it('returns TRUE in React Native when navigator.onLine is not implemented', () => {
+    userAgentGetter.mockReturnValue(undefined);
+    webdriverGetter.mockReturnValue(undefined);
+    onLineGetter.mockReturnValue(undefined);
+    connectionGetter.mockReturnValue(undefined);
+    Object.defineProperty(window.navigator, 'product', {
+      configurable: true,
+      get: () => 'ReactNative',
+    });
+
+    expect(isValidBrowserOnline()).toBe(true);
+  });
 });

packages/shared/src/browser.ts

@@ -73,6 +73,16 @@ export function isBrowserOnline(): boolean {
     return false;
   }
 
+  // React Native / Expo defines a Navigator object but does not implement
+  // the browser-only navigator.onLine API.
+  if (navigator.product === 'ReactNative') {
+    return true;
+  }
+
+  if (typeof navigator.onLine !== 'boolean') {
+    return true;
+  }
+
   // navigator.onLine is the standard API and is reliable for detecting
   // complete disconnection (airplane mode, WiFi off, etc.).
   // The experimental navigator.connection API (rtt/downlink) was previously