Org-Babel support for evaluating mermaid diagrams. Supported header arguments: :file - Output file (required) :theme - Mermaid theme :width, :height - Diagram dimensions :scale - Scale factor :background-color - Background color :mermaid-config-file - Mermaid config file :css-file - CSS file for styling :puppeteer-config-file - Puppeteer config file :pdf-fit - Enable PDF fit mode :cmdline - Additional command line arguments