fix: stabilize cockpit and assistant session handoff

frontend/src/pages/CockpitPage.tsx

@@ -85,6 +85,12 @@ export default function CockpitPage() {
     prevMessageCountRef.current = session.messages.length
   }, [session.messages.length, showOnboarding])
 
+  // Reset local step UI when switching cases or when a new action set arrives.
+  useEffect(() => {
+    setActiveStepIndex(0)
+    setCompletedSteps(new Set())
+  }, [session.activeChatId, session.activeActions])
+
   // ── Triage handlers ──
 
   const handleTriageFieldSave = useCallback(async (field: keyof TriageMeta, value: string) => {
@@ -306,8 +312,7 @@ export default function CockpitPage() {
                   <FlowPilotAsks
                     questions={session.activeQuestions}
                     onAnswer={(answer) => {
-                      session.setInput(answer)
-                      setTimeout(() => session.handleSend(), 10)
+                      void session.sendMessage(answer, { clearComposer: false })
                     }}
                     loading={session.loading}
                   />