style: apply black formatting flagged by pre-commit CI

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y369cCMiSXtzWvXWen54Dp

Author: claude

apps/predbat/output.py

@@ -3385,7 +3385,6 @@ def calculate_yesterday(self):
             final_carbon_g,
         ) = self.run_prediction(charge_limit_best, charge_window_best, [], [], False, end_record=end_record, save="yesterday")
 
-
         # Add back in battery value
         overall_metric, battery_value_baseline = self.compute_metric(
             end_record, final_soc, final_soc, metric_baseline, metric_baseline, final_iboost, final_iboost, battery_cycle, metric_keep, final_carbon_g, import_kwh_battery, import_kwh_house, export_kwh

apps/predbat/tests/test_secrets.py

@@ -168,6 +168,7 @@ def _test_secrets_loading():
             os.remove("predbat.log")
     print("    PASS - Malformed secrets.yaml degrades to {} instead of crashing startup")
 
+
 def test_mask_secret_yaml_text():
     """The apps.yaml file download is redacted without being rewritten.