Update chatStream.js

server/chatStream.js

@@ -65,7 +65,13 @@ export async function websocketChatStream(body, headers, onToken, abortSignal) {
   const ws = new WebSocket(wsURL);
 
   const safeParse = (str) => {
-    try { return JSON.parse(str); } catch { return null; }
+    try {
+      // Strip "data: " prefix if present (Server-Sent Events format)
+      const cleaned = str.startsWith('data: ') ? str.slice(6) : str;
+      return JSON.parse(cleaned);
+    } catch {
+      return null;
+    }
   };
 
   await new Promise((resolve, reject) => {