fix issues

ChatBot.Tests/Models/ChatSessionCompressionTests.cs

@@ -138,7 +138,7 @@ public class ChatSessionCompressionTests
             .Setup(x => x.CompressHistoryAsync(It.IsAny<List<ChatMessage>>(), It.IsAny<int>(), It.IsAny<CancellationToken>()))
             .Returns(async (List<ChatMessage> messages, int target, CancellationToken ct) =>
             {
-                await Task.Delay(50);
+                await Task.Delay(50, ct);
                 return delayedResult;
             });
         compressionServiceMock

ChatBot.Tests/Models/ChatSessionTests.cs

@@ -359,7 +359,7 @@ public class ChatSessionTests
         var session = new ChatSession();
         session.AddUserMessage("Test", "user");
         var lastUpdated = session.LastUpdatedAt;
-        await Task.Delay(10); // Small delay
+        await Task.Delay(10, CancellationToken.None); // Small delay
 
         // Act
         session.ClearHistory();