feat(central-ui): FlowStepDetail Lifecycle tab + outbound request/response labels

A folded outbound step shows a Lifecycle tab (time · kind · status · node ·
error, oldest first; a Parked step adds the 'retry or discard from Site Calls /
Notification report' hint), replaces the never-populated Writes tab for those
steps, labels the Input tab Request / SQL + parameters / Subject + body by kind,
and 'Where this ran' names the System / Connection / List plus 'Delivered by'
(the terminal row's node). Pending/Parked outcome badges.

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

docs/plans/2026-09-06-flow-debugger-outbound-calls.md.tasks.json

@@ -58,7 +58,7 @@
     {
       "id": 7,
       "subject": "Task 7: FlowGraphView \u2014 External lane, status pills, async/spawn edge styles, pending state",
-      "status": "in_progress",
+      "status": "completed",
       "blockedBy": [
         0,
         1,
@@ -68,7 +68,7 @@
     {
       "id": 8,
       "subject": "Task 8: FlowStepDetail \u2014 Lifecycle tab and outbound fields",
-      "status": "pending",
+      "status": "in_progress",
       "blockedBy": [
         0,
         2
@@ -96,5 +96,5 @@
       ]
     }
   ],
-  "lastUpdated": "2026-09-06T05:52:50.321199+00:00"
+  "lastUpdated": "2026-09-06T05:57:47.424541+00:00"
 }