feat(notif): NotificationDetailRequest query for full notification detail

tests/ScadaLink.NotificationOutbox.Tests/NotificationOutboxActorQueryTests.cs

@@ -306,6 +306,57 @@ public class NotificationOutboxActorQueryTests : TestKit
         Assert.Contains("not found", response.ErrorMessage);
     }
 
+    [Fact]
+    public void DetailRequest_KnownId_ReturnsFullDetail_WithBodyAndResolvedTargets()
+    {
+        var row = MakeNotification(
+            status: NotificationStatus.Delivered, retryCount: 2, lastError: "transient blip");
+        row.Body = "Tank-7 has exceeded its high-level setpoint.";
+        row.ResolvedTargets = "[\"ops@example.com\",\"oncall@example.com\"]";
+        row.TypeData = "{\"priority\":\"high\"}";
+        row.SourceScript = "HighLevelAlarm.csx";
+        row.SiteEnqueuedAt = DateTimeOffset.UtcNow.AddMinutes(-5);
+        row.DeliveredAt = DateTimeOffset.UtcNow;
+        _repository.GetByIdAsync(row.NotificationId, Arg.Any<CancellationToken>()).Returns(row);
+        var actor = CreateActor();
+
+        actor.Tell(new NotificationDetailRequest("corr-d1", row.NotificationId), TestActor);
+
+        var response = ExpectMsg<NotificationDetailResponse>();
+        Assert.Equal("corr-d1", response.CorrelationId);
+        Assert.True(response.Success);
+        Assert.Null(response.ErrorMessage);
+        Assert.NotNull(response.Detail);
+        var detail = response.Detail!;
+        Assert.Equal(row.NotificationId, detail.NotificationId);
+        Assert.Equal("Email", detail.Type);
+        Assert.Equal("Delivered", detail.Status);
+        Assert.Equal("Tank-7 has exceeded its high-level setpoint.", detail.Body);
+        Assert.Equal("[\"ops@example.com\",\"oncall@example.com\"]", detail.ResolvedTargets);
+        Assert.Equal("{\"priority\":\"high\"}", detail.TypeData);
+        Assert.Equal("HighLevelAlarm.csx", detail.SourceScript);
+        Assert.Equal("instance-42", detail.SourceInstanceId);
+        Assert.Equal(2, detail.RetryCount);
+        Assert.Equal("transient blip", detail.LastError);
+    }
+
+    [Fact]
+    public void DetailRequest_UnknownId_ReturnsNotFound()
+    {
+        _repository.GetByIdAsync(Arg.Any<string>(), Arg.Any<CancellationToken>())
+            .Returns((Notification?)null);
+        var actor = CreateActor();
+
+        actor.Tell(new NotificationDetailRequest("corr-d2", "missing-id"), TestActor);
+
+        var response = ExpectMsg<NotificationDetailResponse>();
+        Assert.Equal("corr-d2", response.CorrelationId);
+        Assert.False(response.Success);
+        Assert.Null(response.Detail);
+        Assert.NotNull(response.ErrorMessage);
+        Assert.Contains("not found", response.ErrorMessage);
+    }
+
     [Fact]
     public void KpiRequest_ComputesKpis_AndMapsSnapshot()
     {