Fix: Remove unsupported --args option from mmdc command for compatibility

mermaid_renderer.py

@@ -102,7 +102,6 @@ class MermaidRenderer:
                 "-i", input_path,
                 "-o", output_path,
                 "-t", theme,
-                "--args", puppeteer_args_json_str,
                 # No -f flag needed for mmdc, format is determined by -o extension
                 # However, explicitly setting background color might be needed for transparency
                 # "-b", "transparent" # Example: if you want transparent background for PNG/SVG