Can not specify exported file-name without specify title

[dungbuike-prts]

Environment:

• MacBook Pro 2023
• Apple Silicon M2
• macOS 13.3.1

When I exported the graph locally by command

pluralith graph --local-only --show-changes --file-name Pluralith_Diagram_Diff

It exported a PDF file named Pluralith_Diagram.pdf by default without any error or warning.

I have researched and understood the cause of this code

	// Set defaults for export
	if exportArgs["title"] == "" {
		exportArgs["title"] = "Pluralith Diagram"     //+ exportArgs["runId"].(string)
		exportArgs["file-name"] = "Pluralith_Diagram" //+ exportArgs["runId"].(string)
	}

https://github.com/Pluralith/pluralith-cli/blob/main/app/pkg/graph/PreGraph.go#L34-L38

If --title is not specified, it will override option --file-name