fix(ui): keep chat history idle when run status changes (#146802)

ui/src/pages/chat/components/chat-transcript-invalidation.test.ts

@@ -280,6 +280,44 @@ describe("chat transcript invalidation", () => {
     },
   );
 
+  it.each(["done", "interrupted"] as const)(
+    "keeps settled history idle when %s status appears, refreshes or clears",
+    async (phase) => {
+      vi.spyOn(Date, "now").mockReturnValue(60_000);
+      const props = threadProps(`pane-terminal-status-${phase}`);
+      const transcript = createTestTranscript();
+      const container = document.body.appendChild(document.createElement("div"));
+      const rerender = () => {
+        render(renderChatThread(props, transcript), container);
+        transcript.hostUpdated();
+      };
+      try {
+        rerender();
+        transcript.hostConnected();
+        await flushDeferredRowPrune();
+        const bubbles = Array.from(container.querySelectorAll(".chat-bubble"));
+        expect(bubbles).toHaveLength(4);
+        const renderGroup = vi.spyOn(chatMessage, "renderMessageGroup");
+
+        for (const occurredAt of [59_000, 59_500, null]) {
+          props.runStatus =
+            occurredAt === null
+              ? null
+              : { phase, runId: "finished-run", sessionKey: props.sessionKey, occurredAt };
+          rerender();
+
+          expect(renderGroup).not.toHaveBeenCalled();
+          const currentBubbles = Array.from(container.querySelectorAll(".chat-bubble"));
+          expect(currentBubbles).toHaveLength(bubbles.length);
+          currentBubbles.forEach((bubble, index) => expect(bubble).toBe(bubbles[index]));
+          expect(container.textContent).toContain("reply two");
+        }
+      } finally {
+        transcript.hostDisconnected();
+      }
+    },
+  );
+
   it("keeps built row identities across an A to B to A presentation reset", () => {
     const paneId = "pane-session-items";
     const messagesA = [{ role: "assistant", content: "session A", timestamp: 1_000 }];

ui/src/pages/chat/components/chat-transcript-projection.ts

@@ -692,8 +692,6 @@ export function projectChatTranscript(
     props.replyMessageAccess?.revision ?? 0,
     props.replyMessageAccess?.navigationId ?? "",
     turnRecap === null ? "" : `${turnRecap.runtimeMs}:${turnRecap.outputTokens ?? ""}`,
-    props.runStatus?.phase ?? "",
-    props.runStatus?.occurredAt ?? 0,
   ]);
   state.transcriptRenderContext.onSetReply = props.onSetReply;
   state.transcriptRenderContext.onAsyncQuestionSubmit = props.onAsyncQuestionSubmit;