test(adminui): review fixes — locked-snapshot assert, stable fake health, InitializeCount property

tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/DriverReconnectE2eTests.cs

@@ -172,7 +172,7 @@ public sealed class DriverReconnectE2eTests
             List<DriverHealthChanged> snapshot;
             lock (captureLock) snapshot = captured.Where(c => c.DriverInstanceId == DriverId).ToList();
 
-            HasReconnectThenHealthy(captured).ShouldBeTrue(
+            HasReconnectThenHealthy(snapshot).ShouldBeTrue(
                 "Expected a Reconnecting push followed by a later Healthy push for the deployed driver. " +
                 $"States seen: [{string.Join(", ", snapshot.Select(c => c.State))}]");
 
@@ -254,6 +254,8 @@ public sealed class DriverReconnectE2eTests
         await db.SaveChangesAsync(Ct);
     }
 
+    /// <summary>Polls <paramref name="condition"/> every 100 ms until it returns true or
+    /// <paramref name="timeout"/> elapses (then throws <see cref="TimeoutException"/>).</summary>
     private static async Task WaitForAsync(Func<Task<bool>> condition, TimeSpan timeout)
     {
         var deadline = DateTime.UtcNow + timeout;