исправлены ворнинги

Minint.Core/Models/MinintDocument.cs

@@ -65,7 +65,7 @@ public sealed class MinintDocument
     public int FindColorCached(RgbaColor color)
     {
         var cache = EnsurePaletteCache();
-        return cache.TryGetValue(color, out int idx) ? idx : -1;
+        return cache.GetValueOrDefault(color, -1);
     }
 
     /// <summary>

Minint.Core/Services/Impl/ImageEffectsService.cs

@@ -1,4 +1,3 @@
-using System;
 using Minint.Core.Models;
 
 namespace Minint.Core.Services.Impl;