Fixed ruff

Author: DOKOS-TAYOS

tests/frontend/test_theme.py

@@ -89,7 +89,7 @@ class TestGetContrastForeground:
     def test_light_bg_returns_black(self) -> None:
         assert get_contrast_foreground("#ffffff") == "#000000"
         assert get_contrast_foreground("#cccccc") == "#000000"
-        # Use hex to avoid platform differences (tkinter/matplotlib parse "lime green" differently on Linux CI)
+        # Hex avoids platform differences (named colors parse differently on Linux CI)
         assert get_contrast_foreground("#32cd32") == "#000000"  # lime green
 
     def test_dark_bg_returns_white(self) -> None: