fix: move isCurrentConvThinking declaration before useEffect to fix ReferenceError

client/src/pages/Chat.tsx

@@ -648,6 +648,10 @@ export default function Chat() {
   const messages = active?.messages ?? [];
   const convId = activeId;
 
+  const isCurrentConvThinking = activeId
+    ? isConversationThinking(activeId)
+    : false;
+
   // ─── Track agent activities from orchestrator tool calls ───────────────────────
   // Scans messages for delegate_to_agent calls and creates/removes agent activities
 
@@ -747,10 +751,6 @@ export default function Chat() {
     activeId,
   ]);
 
-  const isCurrentConvThinking = activeId
-    ? isConversationThinking(activeId)
-    : false;
-
   const sendMessage = async () => {
     if (!input.trim() || isCurrentConvThinking) return;