feat(macos): enable meeting integrations

MeetingAssistant.Tests/LiteLlmScreenshotOcrClientTests.cs

@@ -2,8 +2,6 @@ using System.Net;
 using System.Net.Http.Headers;
 using System.Text;
 using System.Text.Json;
-using System.Drawing;
-using System.Drawing.Imaging;
 using MeetingAssistant.Screenshots;
 using Microsoft.Extensions.Logging.Abstractions;
 
@@ -284,15 +282,7 @@ public sealed class LiteLlmScreenshotOcrClientTests
 
     private static byte[] CreatePngBytes(int width, int height)
     {
-        using var bitmap = new Bitmap(width, height);
-        using (var graphics = Graphics.FromImage(bitmap))
-        {
-            graphics.Clear(Color.White);
-        }
-
-        using var stream = new MemoryStream();
-        bitmap.Save(stream, ImageFormat.Png);
-        return stream.ToArray();
+        return PngTestFixture.Solid(width, height);
     }
 
     private static string CreateNonStreamingTextResponse(string text)