Improve gateway reliability and dashboard docs

clients/dotnet/MxGateway.Client/GrpcMxGatewayClientTransport.cs

@@ -25,7 +25,7 @@ internal sealed class GrpcMxGatewayClientTransport(
         }
         catch (RpcException exception)
         {
-            throw MapRpcException(exception);
+            throw MapRpcException(exception, callOptions.CancellationToken);
         }
     }
 
@@ -41,7 +41,7 @@ internal sealed class GrpcMxGatewayClientTransport(
         }
         catch (RpcException exception)
         {
-            throw MapRpcException(exception);
+            throw MapRpcException(exception, callOptions.CancellationToken);
         }
     }
 
@@ -57,7 +57,7 @@ internal sealed class GrpcMxGatewayClientTransport(
         }
         catch (RpcException exception)
         {
-            throw MapRpcException(exception);
+            throw MapRpcException(exception, callOptions.CancellationToken);
         }
     }
 
@@ -87,7 +87,7 @@ internal sealed class GrpcMxGatewayClientTransport(
             }
             catch (RpcException exception)
             {
-                throw MapRpcException(exception);
+                throw MapRpcException(exception, effectiveCancellationToken);
             }
 
             yield return gatewayEvent;
@@ -101,8 +101,18 @@ internal sealed class GrpcMxGatewayClientTransport(
         return StreamEventsAsync(request, callOptions);
     }
 
-    private static MxGatewayException MapRpcException(RpcException exception)
+    private static Exception MapRpcException(
+        RpcException exception,
+        CancellationToken cancellationToken)
     {
+        if (cancellationToken.IsCancellationRequested || exception.StatusCode == StatusCode.Cancelled)
+        {
+            return new OperationCanceledException(
+                exception.Status.Detail,
+                exception,
+                cancellationToken);
+        }
+
         return exception.StatusCode switch
         {
             StatusCode.Unauthenticated => new MxGatewayAuthenticationException(