Remove accidentally committed PNG file and update .gitignore

Co-authored-by: Adamtaranto <2160099+Adamtaranto@users.noreply.github.com>

Author: Copilot

.gitignore

@@ -68,3 +68,8 @@ ENV/
 
 # mypy
 .mypy_cache/
+
+# Test output files
+*.png
+*.pdf
+*.svg