fix: unify reasoning mode across submissions

components/scenario-form.jsx

@@ -443,7 +443,7 @@ export default function ScenarioForm() {
       )}
 
       {/* ── Main result workspace ─────────────────────── */}
-      {(status === "success" || status === "error" || updateStatus === "success") && (
+      {(status === "success" || status === "error") && updateStatus !== "loading" && (
         <ReasoningWorkspace
           scenario={scenario}
           status={status}
@@ -475,6 +475,16 @@ export default function ScenarioForm() {
         />
       )}
 
+      {/* ── Update loading (reasoning mode) ─────────── */}
+      {updateStatus === "loading" && status === "success" && (
+        <LoadingOverlay
+          isLoading={true}
+          elapsed={updateElapsed}
+          currentMessage={updateMsg}
+          variant="update"
+        />
+      )}
+
       {/* ── Continue later banner when session was restored ── */}
       {status === "success" && result?.updatedAt && (
         <ContinueLaterBanner onRestart={() => { clearSession(); setStatus("idle"); setResult(null); setAnswer(""); setUpdateStatus("idle"); setCurrentUnderstanding(null); }} />