Fix winner UID

src/wandb_data.py

@@ -182,11 +182,12 @@ def _add_runs(wandb_runs: list[wapi.Run]):
                 ...
 
         status = _status_from_run(wandb_run)
-        winner_uid = min(
+        winner_submission = min(
             submissions.values(),
             key=lambda submission: (submission.rank, submission.info.block),
             default=None
         )
+        winner_uid = winner_submission.info.uid if winner_submission else None
 
         uid = int(wandb_run.config["uid"])
         hotkey = wandb_run.config["hotkey"]