get background color in stories

[faga295]

Clear and concise description of the problem

As a developer using Histoire I wish dynamicly change my text color depending on background color so that get background color in stories is helpful.I intend to submit a PR for this issue.

Suggested solution

maybe we can use project/inject,or some hooks in story component to get the background color,or provide a contrast color variable in global css

Alternative

No response

Additional context

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that requests the same feature to avoid creating a duplicate.

[Akryum]

Providing a contrast color (through a CSS variable) alongside a background color for each background preset seems good!