[eric] tool-ui: expired respond is 200+gone not a red 404, the orphaned state stays

backend/main.py

@@ -938,9 +938,9 @@ async def ui_request_respond(request: Request):
         return JSONResponse({"error": "session_id, component_id and response object are required"}, status_code=400)
     from backend.apps.agents.ui_request_bridge import respond_to_ui_request
     delivered = respond_to_ui_request(session_id, component_id, response)
-    if not delivered:
-        return JSONResponse({"error": "no pending request for that component"}, status_code=404)
-    return JSONResponse({"ok": True})
+    # A consumed/expired request is a normal outcome (replayed transcript, agent moved on), not an
+    # error; 200 + gone keeps Chromium's console free of red 404 noise while the UI shows its orphaned state.
+    return JSONResponse({"ok": delivered, "gone": not delivered})
 
 
 @app.post("/api/invoke-agent/run")

frontend/src/app/pages/AgentChat/tool-ui/AskUiBubble.tsx

@@ -60,8 +60,9 @@ function AskUiBubble({ pair, sessionId, isPending, suppressReveal }: AskUiBubble
         headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${getAuthToken()}` },
         body: JSON.stringify({ session_id: sessionId, component_id: componentId, response }),
       })
-        .then((r) => {
-          if (!r.ok) {
+        .then(async (r) => {
+          const body = r.ok ? await r.json().catch(() => null) : null;
+          if (!r.ok || (body && body.gone)) {
             // Nothing parked server-side (agent gone or this is a replayed transcript): say so instead of silently swallowing the click.
             setSubmitted(false);
             setLocalChoice(undefined);