fix: persist upgraded assistant identity

Author: steipete

src/OpenClaw.Tray.WinUI/Chat/OpenClawChatDataProvider.cs

@@ -4677,6 +4677,11 @@ openClawSeq is not null &&
                 existing.OpenClawSeq == openClawSeq &&
                 string.Equals(entry.Text, assistantText, StringComparison.Ordinal))
             {
+                if (!string.IsNullOrEmpty(gatewayMessageId) &&
+                    string.IsNullOrEmpty(existing.GatewayMessageId))
+                {
+                    threadMeta[entry.Id] = existing with { GatewayMessageId = gatewayMessageId };
+                }
                 return true;
             }
         }

tests/OpenClaw.Tray.Tests/OpenClawChatDataProviderTests.cs

@@ -2713,6 +2713,17 @@ public async Task AssistantRetransmit_WithNewGatewayIdStillMatchesPriorSequenceO
             OpenClawSeq = 10,
         });
 
+        Assert.Empty(snapshots);
+        bridge.RaiseChat(new ChatMessageInfo
+        {
+            SessionKey = "main",
+            Role = "assistant",
+            Text = "cumulative prefix\nstable response",
+            State = "final",
+            OpenClawId = "message-10",
+            OpenClawSeq = 10,
+        });
+
         Assert.Empty(snapshots);
         var current = await provider.LoadAsync();
         Assert.Single(current.Timelines["main"].Entries, e =>