style: format test_render.py

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: rchardx

tests/test_render.py

@@ -124,6 +124,7 @@ def test_value_exceeds_max_clamped(self):
         # 200/100 clamped to full bar
         assert _spark_bar(200, 100) == "█" * 8
 
+
 # ── _fmt_delta ───────────────────────────────────────────────