fix: skip reasoning tag preceded by text

Author: Algorithm5838

backend/open_webui/utils/middleware.py

@@ -3539,7 +3539,7 @@ def set_last_text(out, text):
                             before_tag = item_text[: match.start()]
                             after_tag = item_text[match.end() :]
 
-                            # Start tag follows prose text, treat as a literal mention.
+                            # Tag in prose text, skip it.
                             if before_tag.strip():
                                 continue