Setup Wizard restructuring

- Remove polymorphic base, this only existed because TKMM has a desktop/switch setup prodecure difference and has 2 implementations of the setup wizard. We only need one.
- Remove Systems/UI file split, they're all in Ryujinx.Ava.UI now
- made NotificationHelper instance-based to allow you to encapsulate notifications to a window that magically disappear when the window is closed, instead of switching to showing on the main window.

src/Ryujinx/UI/SetupWizard/Pages/Fw/SetupFirmwarePageContext.cs

@@ -4,8 +4,6 @@ using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Gommon;
 using Ryujinx.Ava.Common.Locale;
-using Ryujinx.Ava.Systems.SetupWizard;
-using Ryujinx.Ava.UI.Helpers;
 using Ryujinx.Ava.Utilities;
 using Ryujinx.Common.Configuration;
 using Ryujinx.HLE.FileSystem;
@@ -81,14 +79,14 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
                 SystemVersion installedFwVer = RyujinxApp.MainWindow.ContentManager.GetCurrentFirmwareVersion();
                 if (installedFwVer != null)
                 {
-                    NotificationHelper.ShowInformation(
+                    Notifications.NotifyInformation(
                         "Firmware installed",
                         $"Installed firmware version {installedFwVer.VersionString}."
                     );
                 }
                 else
                 {
-                    NotificationHelper.ShowError(
+                    Notifications.NotifyError(
                         "Firmware not installed",
                         $"It seems some error occurred when trying to install the firmware at path '{FirmwareSourcePath}'." +
                         "\nDid that folder contain a firmware dump?"
@@ -96,9 +94,6 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
                 }
                 RyujinxApp.MainWindow.ViewModel.RefreshFirmwareStatus(installedFwVer, allowNullVersion: true);
 
-                if (installedFwVer is null)
-                    return Result.Fail;
-
                 // Purge Applet Cache.
 
                 DirectoryInfo miiEditorCacheFolder = new(
@@ -112,7 +107,7 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
             }
             catch (Exception e)
             {
-                NotificationHelper.ShowError(e.Message, waitingExit: true);
+                Notifications.NotifyError(e.Message, waitingExit: true);
                 return Result.Fail;
             }
 

src/Ryujinx/UI/SetupWizard/Pages/Keys/SetupKeysPageContext.cs

@@ -5,8 +5,6 @@ using CommunityToolkit.Mvvm.Input;
 using DynamicData;
 using Gommon;
 using Ryujinx.Ava.Common.Locale;
-using Ryujinx.Ava.Systems.SetupWizard;
-using Ryujinx.Ava.UI.Helpers;
 using Ryujinx.Ava.Utilities;
 using Ryujinx.Common.Configuration;
 using Ryujinx.Common.Logging;
@@ -42,7 +40,7 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
             }
         }
 
-        private static Result InstallKeys(string directory)
+        private Result InstallKeys(string directory)
         {
             try
             {
@@ -57,18 +55,18 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
 
                 ContentManager.InstallKeys(directory, systemDirectory);
 
-                NotificationHelper.ShowInformation(
+                Notifications.NotifyInformation(
                     title: LocaleManager.Instance[LocaleKeys.RyujinxInfo],
                     text: LocaleManager.Instance[LocaleKeys.DialogKeysInstallerKeysInstallSuccessMessage]);
             }
             catch (InvalidFirmwarePackageException ifwpe)
             {
-                NotificationHelper.ShowError(ifwpe.Message, waitingExit: true);
+                Notifications.NotifyError(ifwpe.Message, waitingExit: true);
                 return Result.Failure(NoKeysFoundInFolder.Shared);
             }
             catch (MissingKeyException ex)
             {
-                NotificationHelper.ShowError(ex.ToString(), waitingExit: true);
+                Notifications.NotifyError(ex.ToString(), waitingExit: true);
                 return Result.Failure(NoKeysFoundInFolder.Shared);
             }
             catch (Exception ex)
@@ -80,7 +78,7 @@ namespace Ryujinx.Ava.UI.SetupWizard.Pages
                         LocaleKeys.DialogKeysInstallerKeysNotFoundErrorMessage, directory);
                 }
 
-                NotificationHelper.ShowError(message, waitingExit: true);
+                Notifications.NotifyError(message, waitingExit: true);
 
                 return Result.Failure(new MessageError(message));
             }