fix(lint): remove unused imports and reformat with black

tests/test_e2e_playwright.py

@@ -159,7 +159,7 @@ def test_homepage_and_options_page_render() -> None:
         assert "RuntimeError" not in backtests_workspace_text
         assert "Server error" not in backtests_workspace_text
         assert "Traceback" not in backtests_workspace_text
-        
+
         # Test backtest run by filling in fixture-supported dates
         page.get_by_label("Start date").fill("2024-01-02")
         page.get_by_label("End date").fill("2024-01-08")
@@ -184,7 +184,7 @@ def test_homepage_and_options_page_render() -> None:
         # Page should render without runtime errors
         assert "RuntimeError" not in event_workspace_text
         assert "Traceback" not in event_workspace_text
-        
+
         # Fill in value and run comparison
         page.get_by_label("Initial portfolio value").fill("100000")
         page.get_by_role("button", name="Run comparison").click()
@@ -194,14 +194,14 @@ def test_homepage_and_options_page_render() -> None:
         # Should have results or error, but not runtime crash
         assert "RuntimeError" not in event_result_text
         assert "Traceback" not in event_result_text
-        
+
         # Test preset selection
         page.get_by_label("Event preset").click()
         page.get_by_text("GLD January 2024 Drawdown", exact=True).click()
         page.wait_for_timeout(1000)
         event_preset_text = page.locator("body").inner_text(timeout=15000)
         assert "RuntimeError" not in event_preset_text
-        
+
         page.goto(workspace_url, wait_until="domcontentloaded", timeout=30000)
         overview_text = page.locator("body").inner_text(timeout=15000)
         assert "Hedge Analysis" in overview_text

tests/test_page_validation.py

@@ -1,4 +1,5 @@
 """Tests for page validation functions and constants."""
+
 from __future__ import annotations
 
 from datetime import date, timedelta
@@ -218,7 +219,7 @@ class TestValidateDateRangeForSymbolBoundaryCases:
         """Test that start > end is caught before symbol-specific bounds."""
         # Inverted range that's also before GLD launch
         start = date(2000, 1, 1)  # Before GLD launch
-        end = date(1999, 1, 1)   # Before start
+        end = date(1999, 1, 1)  # Before start
         error = validate_date_range_for_symbol(start, end, "GLD")
         # Should get "start > end" error, not "before min date" error
         assert error is not None
@@ -311,4 +312,4 @@ class TestValidateNumericInputs:
         error_low = validate_numeric_inputs(1000.0, 50000.0, 0.01)
         assert error_low is None
         error_high = validate_numeric_inputs(1000.0, 50000.0, 0.99)
-        assert error_high is None
+        assert error_high is None