style: apply ruff lint fixes and formatting to figment modules

Fixes: unused imports, import sorting, unused variable, overly broad
exception type in test.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_figment_render.py

@@ -31,7 +31,8 @@ class TestRasterizeSvg:
 
     def test_nonexistent_file_raises(self):
         import pytest
-        with pytest.raises(Exception):
+
+        with pytest.raises((FileNotFoundError, OSError)):
             rasterize_svg("/nonexistent/file.svg", 40, 20)