Regenerate app icon assets and apply minor service fixes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: CedrickGD

RazorReaper/ArkUtilities.cs

@@ -1,7 +1,5 @@
-using System.Collections.Generic;
-using System.IO;
-using System.Text.RegularExpressions;
 using Microsoft.Win32;
+using System.Text.RegularExpressions;
 
 namespace RazorReaper
 {

RazorReaper/Components/Pages/PixelCategories.cs

@@ -1,6 +1,3 @@
-using System.Collections.Generic;
-using System.IO;
-
 namespace RazorReaper.Components.Pages
 {
     public static class PixelTextureCategories

RazorReaper/Platforms/Windows/App.xaml.cs

@@ -1,5 +1,3 @@
-using Microsoft.UI.Xaml;
-
 // To learn more about WinUI, the WinUI project structure,
 // and more about our project templates, see: http://aka.ms/winui-project-info.