fix: header disappear after returning search page

Author: AuroraZiling

src/ViewModels/Pages/Environment/EnvironmentViewModel.cs

@@ -39,10 +39,6 @@ private void InitializeViewModel()
     [ObservableProperty]
     private EnvironmentModel? _currentEnvironment;
 
-    [ObservableProperty]
-    [NotifyCanExecuteChangedFor(nameof(RemoveEnvironmentCommand), nameof(CheckEnvironmentCommand))]
-    private bool _environmentSelected;
-
     protected override void OnPropertyChanged(PropertyChangedEventArgs e)
     {
         base.OnPropertyChanged(e);
@@ -198,7 +194,6 @@ private async Task RemoveEnvironment(EnvironmentModel environment)
 
         var mainWindowViewModel = App.GetService<MainWindowViewModel>();
         mainWindowViewModel.ApplicationTitle = "Pip Manager";
-        EnvironmentSelected = false;
     }
 
     #endregion

src/ViewModels/Pages/Search/SearchViewModel.cs

@@ -141,6 +141,10 @@ public Task OnNavigatedToAsync()
     {
         if (!_isInitialized)
             InitializeViewModel();
+        Application.Current.Dispatcher.InvokeAsync(() =>
+        {
+            navigationService.GetNavigationControl().BreadcrumbBar!.Visibility = Visibility.Visible;
+        });
         return Task.CompletedTask;
     }