removed previews on create_thread (doesn't add any additional useful info + is more noisy)

app.py

@@ -155,7 +155,9 @@ def post_to_slack_create_thread(channel, text, thread_ts=None):
         response = slack_client.chat_postMessage(
             channel=channel,
             text=text,
-            thread_ts=thread_ts
+            thread_ts=thread_ts,
+            unfurl_links=False,
+            unfurl_media=False  
         )
         return response['ts']  # Return the Slack message timestamp (thread ID)
     except SlackApiError as e: