fix: improve agent activity reporting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/renderer/components/ChatPane.tsx

@@ -40,6 +40,8 @@ export function ChatPane({ activity, project, pattern, session, onSend }: ChatPa
     () => buildAgentActivityRows(activity, pattern.agents),
     [activity, pattern.agents],
   );
+  const hasObservedActivity = activityRows.some((row) => !!row.activity);
+  const showActivityPanel = (isBusy || hasObservedActivity) && activityRows.length > 0;
 
   useEffect(() => {
     transcriptRef.current?.scrollTo({
@@ -138,7 +140,7 @@ export function ChatPane({ activity, project, pattern, session, onSend }: ChatPa
               })}
             </div>
 
-            {isBusy && activityRows.length > 0 && (
+            {showActivityPanel && (
               <div className="mb-4 rounded-xl border border-zinc-800 bg-zinc-900/60 px-4 py-3">
                 <div className="mb-3 text-[11px] font-semibold uppercase tracking-[0.16em] text-zinc-600">
                   Agent activity

src/renderer/lib/sessionActivity.ts

@@ -42,15 +42,11 @@ export function applySessionEventActivity(
   }
 
   if (event.kind === 'status') {
-    if (event.status === 'running' || event.status === 'idle' || event.status === 'error') {
+    if (event.status === 'running') {
       return removeSessionActivity(current, event.sessionId);
     }
   }
 
-  if (event.kind === 'error') {
-    return removeSessionActivity(current, event.sessionId);
-  }
-
   return current;
 }