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

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