[iOS 26] Changing SystemUiMode doesn't change safe area

### Steps to reproduce

1. Run any Flutter app on iOS 26
2. Change SystemUiMode to `immersive` by running `SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersive);`

### Expected results

The top padding of SafeArea is correctly changed as the SystemUiMode changes.
Running on iOS 18.6

https://github.com/user-attachments/assets/11498783-3b74-4e82-8c2d-66079774571f

### Actual results

The top padding of SafeArea keeps the previous value. But after rotating the screen or resizing the window, the top padding is updated to the correct value.
Running on iOS 26

https://github.com/user-attachments/assets/c4367d21-f555-40b5-932c-73ff542784c6

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _isImmersive = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Container(
          width: double.infinity,
          height: double.infinity,
          color: Colors.grey,
          child: Column(
            spacing: 8,
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text('Immersive mode: $_isImmersive'),
              Text(
                'Safe area padding top: ${MediaQuery.of(context).padding.top}',
              ),
              FilledButton(
                onPressed: () {
                  if (_isImmersive) {
                    SystemChrome.setEnabledSystemUIMode(
                      SystemUiMode.edgeToEdge,
                    );
                    setState(() {
                      _isImmersive = false;
                    });
                  } else {
                    SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersive);
                    setState(() {
                      _isImmersive = true;
                    });
                  }
                },
                child: const Text('Test'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

```

</details>


### Screenshots or Video

_No response_

### Logs

_No response_

### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.35.4, on macOS 26.0 25A354 darwin-arm64, locale en-KR) [251ms]
    • Flutter version 3.35.4 on channel stable at /Users/seunghyun/fvm/versions/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision d693b4b9db (25 hours ago), 2025-09-16 14:27:41 +0000
    • Engine revision c298091351
    • Dart version 3.9.2
    • DevTools version 2.48.0
    • Feature flags: enable-web, no-enable-linux-desktop, no-enable-macos-desktop, no-enable-windows-desktop,
      enable-android, enable-ios, cli-animations, enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [1,036ms]
    • Android SDK at /Users/seunghyun/Library/Android/Sdk
    • Emulator version 35.2.10.0 (build_id 12414864) (CL:N/A)
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /Users/seunghyun/Library/Android/Sdk
    • Java binary at: /Users/seunghyun/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 26.0) [708ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 17A324
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [18ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.3) [18ms]
    • Android Studio at /Users/seunghyun/Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)

[✓] IntelliJ IDEA Ultimate Edition (version 2025.1.2) [17ms]
    • IntelliJ at /Users/seunghyun/Applications/IntelliJ IDEA Ultimate.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.101.1) [5ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.112.0

[✓] Connected device (5 available) [5.8s]
    • Seunghyun’s iPad (wireless) (mobile)         • 00008020-001B59413A83002E            • ios            • iOS 18.6.2
      22G100
    • iPhone 14 Pro (mobile)                       • 3794BC81-1DEA-4AF4-B5FA-3DA2FCF87C6F • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-26-0 (simulator)
    • iPad Pro (11-inch) (4th generation) (mobile) • 36564CCB-3F65-4FBF-8956-495C518CA3DE • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-26-0 (simulator)
    • iPad Pro (11-inch) (4th generation) (mobile) • 1E2A25BD-1080-47CF-82C6-831C4928805A • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-18-6 (simulator)
    • Chrome (web)                                 • chrome                               • web-javascript • Google Chrome
      140.0.7339.133

[✓] Network resources [312ms]
    • All expected network resources are available.

• No issues found!
```

</details>


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[iOS 26] Changing SystemUiMode doesn't change safe area #175520

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Uh oh!

[iOS 26] Changing SystemUiMode doesn't change safe area #175520

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