Bug: Neutral + Light mode = Invisible primary color

[wfjsw]

Version

Vben Admin V5

Describe the bug?

Reproduction

In https://www.vben.pro/, click Preferences, choose Built-in => Neutral, then Theme => Light

System Info

N/A

Relevant log output

No response

Validations

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• Ensure the code is up to date. (Some issues have been fixed in the latest version)
• I have searched the existing issues and checked that my issue does not duplicate any existing issues.
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• The provided reproduction is a minimal reproducible example of the bug.