refactor: improve code formatting and readability in test files

tests/test_dashboard.py

@@ -190,8 +190,7 @@ async def test_dashboard_page_and_fragment_and_sse(tmp_path) -> None:
     assert "trade-open" in overview.text
 
     assert overview_stream.status_code == 200
-    assert overview_stream.headers["content-type"].startswith(
-        "text/event-stream")
+    assert overview_stream.headers["content-type"].startswith("text/event-stream")
     assert "event: overview" in overview_stream.text
     assert "trade-open" in overview_stream.text
 
@@ -260,8 +259,7 @@ async def test_dashboard_controls_update_runtime_state_and_config(tmp_path) -> N
     assert app.state.settings.max_trade_capital_usd == 300.0
     assert app.state.settings.max_concurrent_trades == 4
     assert app.state.settings.paper_trading_mode is True
-    assert app.state.dashboard_controls.tradable_pairs == [
-        "BTC/USD", "ETH/BTC"]
+    assert app.state.dashboard_controls.tradable_pairs == ["BTC/USD", "ETH/BTC"]
     assert app.state.dashboard_controls.strategy_mode == "paper"
     assert app.state.dashboard_controls.strategy_profit_threshold == 0.0025
     assert app.state.dashboard_controls.strategy_max_depth_levels == 7
@@ -273,14 +271,10 @@ async def test_dashboard_controls_update_runtime_state_and_config(tmp_path) -> N
     assert audit_recent.status_code == 200
     entries = audit_recent.json()["entries"]
     assert len(entries) >= 4
-    assert any(entry["event_type"] ==
-               "dashboard.control.stop" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.start" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.kill_switch" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.config" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.stop" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.start" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.kill_switch" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.config" for entry in entries)
 
 
 async def test_dashboard_controls_emit_alerts(tmp_path) -> None: