feat(commons): FlowGraphBuilder folds outbound lifecycles into one node; async/spawn edges; Response from the inbound execution

Fold rule: outbound rows sharing (kind, CorrelationId) become one FlowStep with
a Lifecycle list — first row's identity/time/input, latest row's outcome/
subtitle/output/error, DurationMs = sync row's own or submit→terminal wall time
(null while pending). Chain skips async steps (Notify, or first row
CachedSubmit) and links them with Async edges from the preceding chain step.
Spawner edges from a non-RouteCall are Spawn: true. The Response links from the
last non-async step of the inbound execution (the RouteCall), not the globally
last cascaded step (D9). FlowGraphView places a Response at max column + 1 so
the D9 origin does not pull it left (pulled forward from Task 7 to keep the
layout test green).

Claude-Session: https://claude.ai/code/session_01NcMG6xXdsJbmD2wYAgkK29

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/FlowGraphView.razor.cs

@@ -396,6 +396,14 @@ public partial class FlowGraphView : ComponentBase
                 }
             }
 
+            // The Response is the flow's final node: it sits right of everything real regardless of
+            // its predecessor's column (the builder links it from the route call — D9 — which would
+            // otherwise drag it back to column 2 while the site work sits to its right).
+            var isResponse = (stepByKey.TryGetValue(k, out var sk) && sk.Kind == FlowStepKind.Response)
+                             || (predByKey.TryGetValue(k, out var pk) && pk.Kind == FlowStepKind.Response);
+            if (isResponse && column.Count > 0)
+                col = Math.Max(col, column.Values.Max() + 1);
+
             while (!occupied.Add((lane[k], col)))
                 col++;
             column[k] = col;