Fix _build_response_args status_code priority: handler-set value wins over route decorator

fastapi/routing.py

@@ -336,12 +336,13 @@ def _build_response_args(
     response_args: dict[str, Any] = {
         "background": solved_result.background_tasks,
     }
-    # If status_code was set, use it, otherwise use the default from the
-    # response class, in the case of redirect it's 307
-    if status_code is not None:
-        response_args["status_code"] = status_code
-    elif solved_result.response.status_code:
+    # If the response object has a status_code set (e.g. inside a dependency
+    # or path operation), it takes priority over the route-level status_code.
+    # Otherwise, use the route-level status_code if provided.
+    if solved_result.response.status_code:
         response_args["status_code"] = solved_result.response.status_code
+    elif status_code is not None:
+        response_args["status_code"] = status_code
     return response_args