show not found in search box

src/Snap.Hutao/Snap.Hutao/Control/AutoSuggestBox/AutoSuggestTokenBox.cs

@@ -56,7 +56,8 @@ internal sealed partial class AutoSuggestTokenBox : TokenizingTextBox
             sender.ItemsSource = AvailableTokens
                 .Where(kvp => kvp.Value.Value.Contains(Text, StringComparison.OrdinalIgnoreCase))
                 .OrderBy(kvp => kvp.Value.Kind)
-                .Select(kvp => kvp.Value);
+                .Select(kvp => kvp.Value)
+                .DefaultIfEmpty(SearchToken.NotFound);
         }
     }
 

src/Snap.Hutao/Snap.Hutao/Control/AutoSuggestBox/SearchToken.cs

@@ -7,6 +7,8 @@ namespace Snap.Hutao.Control.AutoSuggestBox;
 
 internal sealed class SearchToken
 {
+    public static readonly SearchToken NotFound = new(SearchTokenKind.None, SH.ControlAutoSuggestBoxNotFoundValue);
+
     public SearchToken(SearchTokenKind kind, string value, Uri? iconUri = null, Uri? sideIconUri = null, Color? quality = null)
     {
         Value = value;

src/Snap.Hutao/Snap.Hutao/Resource/Localization/SH.en.resx

@@ -144,6 +144,9 @@
   <data name="ContentDialogSavePrimaryButtonText" xml:space="preserve">
     <value>Save</value>
   </data>
+  <data name="ControlAutoSuggestBoxNotFoundValue" xml:space="preserve">
+    <value>No results found</value>
+  </data>
   <data name="ControlImageCachedImageInvalidResourceUri" xml:space="preserve">
     <value>Invalid Uri</value>
   </data>

src/Snap.Hutao/Snap.Hutao/Resource/Localization/SH.resx

@@ -144,6 +144,9 @@
   <data name="ContentDialogSavePrimaryButtonText" xml:space="preserve">
     <value>保存</value>
   </data>
+  <data name="ControlAutoSuggestBoxNotFoundValue" xml:space="preserve">
+    <value>未找到结果</value>
+  </data>
   <data name="ControlImageCachedImageInvalidResourceUri" xml:space="preserve">
     <value>无效的 Uri</value>
   </data>