[PR-Reviewer] Add null safety check to Android inset dispatch fix and correct test naming

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Description of Change

This PR addresses two issues found during review of PR dotnet#32537:

1. Critical Null Safety Issue

The ViewGroupCompat.InstallCompatInsetsDispatch(_rootView) call in NavigationRootManager.cs can throw NullReferenceException when the IFlyoutView code path doesn't set _rootView. Specifically:

if (view is IFlyoutView)
{
    var containerView = view.ToContainerView(mauiContext);
    // Neither condition sets _rootView if containerView.MainView is not DrawerLayout
    if (containerView is DrawerLayout dl) { _rootView = dl; }
    else if (containerView is ContainerView cv && cv.MainView is DrawerLayout dlc) { _rootView = cv; }
    // _rootView remains null here in edge case
}

if(!OperatingSystem.IsAndroidVersionAtLeast(30))
{
    ViewGroupCompat.InstallCompatInsetsDispatch(_rootView);  // NullReferenceException
}

Fix: Add null check before calling the method.

2. Test Naming Mismatch

Test files are named Issue32278.* but PR dotnet#32537 fixes issue dotnet#32526. Issue dotnet#32278 is a different, already-merged PR about WindowInsetListener refactoring.

Fix: Rename all test files from Issue32278 to Issue32526 and update internal references.

Changes Made

• NavigationRootManager.cs: Add && _rootView is not null null safety check
• Test files: Rename Issue32278.* → Issue32526.* and update class names, attributes, and references

Issues Fixed

Fixes critical null safety bug in dotnet#32537
Fixes test naming mismatch in dotnet#32537

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