fix: preserve accurate investigation history

components/reasoning-workspace.jsx

@@ -103,18 +103,14 @@ function SituationCard({ centralStatement }) {
 function CurrentUnderstanding({ currentSummary }) {
   const summary = resolveCurrentSummary(currentSummary);
 
+  if (!summary) return null;
+
   return (
     <div className="investigation-card rounded-lg border border-gray-200 bg-white p-5">
       <h2 className="mb-3 text-sm font-semibold uppercase tracking-wide text-gray-500">
         What we&#x27;ve established
       </h2>
-      {summary ? (
+      <p className="text-sm leading-relaxed text-gray-700">{summary}</p>
-        <p className="text-sm leading-relaxed text-gray-700">{summary}</p>
-      ) : (
-        <p className="text-sm leading-relaxed text-gray-600">
-          We have separated what is known from what still needs checking.
-        </p>
-      )}
     </div>
   );
 }
@@ -199,21 +195,30 @@ function CurrentFocusCard({ graph }) {
 
 // ── Investigation history card ────────────────────────────────
 function InvestigationHistoryCard({ turn }) {
+  const qSnippet = turn.question.length > 80
+    ? turn.question.slice(0, 80) + "…"
+    : turn.question;
+
   return (
-    <details className="rounded-lg border border-gray-100 bg-gray-50/60 px-4 py-3">
+    <details className="rounded-lg border border-gray-100 bg-gray-50/60 px-4 py-3" key={turn.id}>
       <summary className="cursor-pointer text-xs font-semibold uppercase tracking-wide text-gray-400 hover:text-gray-600">
         {new Date(turn.timestamp).toLocaleString(undefined, {
           month: "short",
           day: "numeric",
           hour: "2-digit",
           minute: "2-digit",
-        })}
+        })} — {qSnippet}
       </summary>
       <div className="mt-2 space-y-2 text-sm">
-        <p><strong>{turn.question}</strong></p>
+        <p><strong>Question</strong></p>
+        <p>{turn.question}</p>
+        <p><strong>You answered</strong></p>
         <p className="text-gray-700">{turn.answer}</p>
         {turn.acknowledgement && (
-          <p className="italic text-gray-500">{turn.acknowledgement}</p>
+          <>
+            <p><strong>What changed</strong></p>
+            <p className="italic text-gray-500">{turn.acknowledgement}</p>
+          </>
         )}
       </div>
     </details>
@@ -230,8 +235,8 @@ function InvestigationHistory({ turns }) {
         Investigation history
       </h2>
       <div className="space-y-2">
-        {turns.map((turn, idx) => (
+        {turns.map((turn) => (
-          <InvestigationHistoryCard key={idx} turn={turn} />
+          <InvestigationHistoryCard key={turn.id} turn={turn} />
         ))}
       </div>
     </div>
@@ -384,33 +389,42 @@ export default function ReasoningWorkspace({
   lastSubmittedAnswer,
 }) {
   const [investigationHistory, setInvestigationHistory] = useState([]);
+  const turnCounter = useRef(0);
+  const pendingTurnRef = useRef(null);
 
-  // Capture the previous question before each new question is set
+  // Capture the current selected question at submit time (not from a stale ref)
-  const prevQuestionRef = useRef(null);
+  const capturePendingTurn = (selectedQuestion, answerText) => {
-  const hasCapturedInitialQuestion = useRef(false);
+    if (!selectedQuestion || !answerText?.trim()) return null;
+    const q = typeof selectedQuestion === "string" ? selectedQuestion : selectedQuestion.question;
+    if (!q) return null;
+    turnCounter.current += 1;
+    return {
+      id: `turn-${turnCounter.current}`,
+      question: q,
+      answer: answerText.trim(),
+      acknowledgement: null,
+      timestamp: Date.now(),
+    };
+  };
 
+  // Append the captured pending turn to history after a successful update only
   useEffect(() => {
-    if (result?.selectedQuestion && !hasCapturedInitialQuestion.current) {
+    const pending = pendingTurnRef.current;
-      prevQuestionRef.current = result.selectedQuestion;
+    if (!pending || updateStatus !== "success") return;
-      hasCapturedInitialQuestion.current = true;
-    }
-  }, [result?.selectedQuestion]);
 
-  // Append completed turn to history after a successful update
+    setInvestigationHistory((prev) => [
-  useEffect(() => {
+      ...prev,
-    if (updateStatus === "success" && lastSubmittedAnswer) {
+      { ...pending, acknowledgement: result?.summary || null },
-      const q = prevQuestionRef.current;
+    ]);
-      setInvestigationHistory((prev) => [
+    pendingTurnRef.current = null;
-        ...prev,
+  }, [updateStatus, result]);
-        {
+
-          question: typeof q === "string" ? q : q?.question ?? "",
+  const handleUpdateCaptureAndSubmit = async (e) => {
-          answer: lastSubmittedAnswer,
+    e.preventDefault();
-          acknowledgement: result?.summary || null,
+    if (!answer?.trim() || !result?.selectedQuestion) return;
-          timestamp: Date.now(),
+    pendingTurnRef.current = capturePendingTurn(result.selectedQuestion, answer);
-        },
+    await onAnswerSubmit(e);
-      ]);
+  };
-    }
-  }, [updateStatus, lastSubmittedAnswer, result]);
 
   const { elapsed: startElapsed, currentMessage: startMsg } = useLoadingStatus(
     INITIAL_MESSAGES,
@@ -494,7 +508,7 @@ export default function ReasoningWorkspace({
 
           {/* ── Answer form ──────────────────────────────── */}
           {canAnswer && (
-            <form onSubmit={onAnswerSubmit} className="space-y-4 rounded-lg border border-gray-200 bg-white p-5">
+            <form onSubmit={handleUpdateCaptureAndSubmit} className="space-y-4 rounded-lg border border-gray-200 bg-white p-5">
               <div>
                 <label htmlFor="rw-answer" className="mb-2 block text-sm font-medium text-gray-700">
                   Your response