UI: Only show Amiibo bin scan menu item if the key file exists

Added functionality to load 532-byte Amiibo BIN files, commonly used in
Tagmo and similar tools. These files were missing the following pages.
*    133 (85h) PWD
*    134 (86h) PACK RFUI
These pages can be added as null bytes if not present. The system seems
to function correctly without them.

src/Ryujinx.HLE/HOS/Services/Nfc/AmiiboDecryption/AmiiboBinReader.cs

@@ -33,9 +33,12 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
             const int pageSize = 4;
             const int totalBytes = totalPages * pageSize;
 
-            if (fileBytes.Length < totalBytes)
+            if (fileBytes.Length == 532)
             {
-                return new VirtualAmiiboFile();
+                // add 8 bytes to the end of the file
+                byte[] newFileBytes = new byte[totalBytes];
+                Array.Copy(fileBytes, newFileBytes, fileBytes.Length);
+                fileBytes = newFileBytes;
             }
 
             AmiiboDecrypter amiiboDecryptor = new AmiiboDecrypter(keyRetailBinPath);
@@ -171,6 +174,14 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
                 return false;
             }
 
+            if (readBytes.Length == 532)
+            {
+                // add 8 bytes to the end of the file
+                byte[] newFileBytes = new byte[540];
+                Array.Copy(readBytes, newFileBytes, readBytes.Length);
+                readBytes = newFileBytes;
+            }
+
             AmiiboDecrypter amiiboDecryptor = new AmiiboDecrypter(keyRetailBinPath);
             AmiiboDump amiiboDump = amiiboDecryptor.DecryptAmiiboDump(readBytes);
 
@@ -231,6 +242,14 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
                 return false;
             }
 
+            if (readBytes.Length == 532)
+            {
+                // add 8 bytes to the end of the file
+                byte[] newFileBytes = new byte[540];
+                Array.Copy(readBytes, newFileBytes, readBytes.Length);
+                readBytes = newFileBytes;
+            }
+
             AmiiboDecrypter amiiboDecryptor = new AmiiboDecrypter(keyRetailBinPath);
             AmiiboDump amiiboDump = amiiboDecryptor.DecryptAmiiboDump(readBytes);
             amiiboDump.AmiiboNickname = newNickName;
@@ -314,10 +333,9 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
             return Path.Combine(AppDataManager.KeysDirPath, "key_retail.bin");
         }
 
-        public static bool HasKeyRetailBinPath()
-        {
-            return File.Exists(GetKeyRetailBinPath());
-        }
+        public static bool HasKeyRetailBinPath => File.Exists(GetKeyRetailBinPath());
+
+        
         public static DateTime DateTimeFromTag(ushort value)
         {
             try

src/Ryujinx/UI/ViewModels/MainWindowViewModel.cs

@@ -127,6 +127,9 @@ namespace Ryujinx.Ava.UI.ViewModels
 
         public IEnumerable<LdnGameData> LastLdnGameData;
 
+        // The UI specifically uses a thicker bordered variant of the icon to avoid crunching out the border at lower resolutions.
+        // For an example of this, download canary 1.2.95, then open the settings menu, and look at the icon in the top-left.
+        // The border gets reduced to colored pixels in the 4 corners.
         public static readonly Bitmap IconBitmap =
             new(Assembly.GetAssembly(typeof(ConfigurationState))!.GetManifestResourceStream("Ryujinx.UI.Common.Resources.Logo_Thiccjinx.png")!);
 
@@ -330,6 +333,9 @@ namespace Ryujinx.Ava.UI.ViewModels
                 OnPropertyChanged();
             }
         }
+
+        public bool CanScanAmiiboBinaries => AmiiboBinReader.HasKeyRetailBinPath;
+        
         public bool ShowLoadProgress
         {
             get => _showLoadProgress;

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml

@@ -247,6 +247,7 @@
                     Click="OpenBinFile"
                     Header="{ext:Locale MenuBarActionsScanAmiiboBin}"
                     Icon="{ext:Icon mdi-cube-scan}"
+                    IsVisible="{Binding CanScanAmiiboBinaries}"
                     IsEnabled="{Binding IsAmiiboBinRequested}" />
                 <MenuItem
                     Command="{Binding TakeScreenshot}"

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml.cs

@@ -178,7 +178,7 @@ namespace Ryujinx.Ava.UI.Views.Main
         private void ScanBinAmiiboMenuItem_AttachedToVisualTree(object sender, VisualTreeAttachmentEventArgs e)
         {
             if (sender is MenuItem)
-                ViewModel.IsAmiiboBinRequested = ViewModel.IsAmiiboRequested && AmiiboBinReader.HasKeyRetailBinPath();
+                ViewModel.IsAmiiboBinRequested = ViewModel.IsAmiiboRequested && AmiiboBinReader.HasKeyRetailBinPath;
         }
 
         private async void InstallFileTypes_Click(object sender, RoutedEventArgs e)