debug: add logging to trace onFinish callback execution

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sweetmantech

lib/chat/handleChatGenerate.ts

@@ -41,6 +41,7 @@ export async function handleChatGenerate(request: NextRequest): Promise<Response
       ],
     } as UIMessage;
 
+    console.log("🟢 Calling handleChatCompletion for generate endpoint");
     void handleChatCompletion(body, [responseUIMessage]).catch((e) => {
       console.error("Failed to handle chat completion:", e);
     });

lib/chat/handleChatStream.ts

@@ -44,6 +44,7 @@ export async function handleChatStream(request: NextRequest): Promise<Response>
         });
       },
       onFinish: ({ messages }) => {
+        console.log("🟢 onFinish triggered, messages count:", messages?.length);
         void handleChatCompletion(body, messages).catch((e) => {
           console.error("Failed to handle chat completion:", e);
         });