Dimensions API does not handles orientation change

Description

Dimensions API always return portrait mode values (height > width) even if app was started in landscape mode.
Try to rotate device and check console output - height > width always.

Steps to reproduce

1. npx @react-native-community/cli@latest init rn791

2. cd rn791

3. yarn

4. cd ios && pod install

5. add next lines of code to App.tsx
   `useEffect(() => {
   const updateOrientation = () => {
   const {height, width} = Dimensions.get('window');
   const orientation = width > height ? 'landscape' : 'portrait';
   console.log('new orientation: ', orientation);
   };

   updateOrientation();
   const subscription = Dimensions.addEventListener(
   'change',
   updateOrientation,
   );

   return () => {
   subscription?.remove();
   };
   }, []);`

React Native Version

0.79.1

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

System:
  OS: macOS 15.4.1
  CPU: (10) arm64 Apple M1 Pro
  Memory: 104.02 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.12.0
    path: ~/.nvm/versions/node/v22.12.0/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.nvm/versions/node/v22.12.0/bin/yarn
  npm:
    version: 10.9.0
    path: ~/.nvm/versions/node/v22.12.0/bin/npm
  Watchman:
    version: 2024.11.25.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.4
      - iOS 18.4
      - macOS 15.4
      - tvOS 18.4
      - visionOS 2.4
      - watchOS 11.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2024.3 AI-243.24978.46.2431.13208083
  Xcode:
    version: 16.3/16E140
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.13
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 18.0.0
    wanted: 18.0.0
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.79.1
    wanted: 0.79.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

no stacktrace

MANDATORY Reproducer

https://github.com/roman-zaitsev/rn791-dimensions-api-bug-reproducer

Screenshots and Videos

No response

Comienza con el rn791-dimensions-api-bug-reproducer obligatorio y el registro de orientación en App.tsx; gira el dispositivo iOS o el simulador y confirma la salida del evento de cambio de Dimensions. Rastrea el manejo de la API Dimensions de iOS que produce esos valores y considera completado el issue cuando width y height reflejen la orientación actual después de la rotación y el comportamiento esté cubierto por una prueba adecuada.