Mermaid: Low contrast of arrow heads in sequence diagram (dark theme)

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I just ran into this issue too.

@WhiteNoise This is a similar theming issue with mermaid diagrams that I pointed out in Mermaid gitGraph colors are hard to see

This time it’s the signalColor that’s hardcoded to #333 instead of using the theme variables.
This can be shown by opening the dev console and running this then re-rendering the diagram

mermaid.mermaidAPI.updateSiteConfig({
  themeVariables: {
    signalColor: "var(--text-normal)"
  }
})