Fix alpha transparent background for other colors

[hassanaitnacer]

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code.
• Include the URL where we can test the change in the body of your PR.

This pull request:

• Fixes a bug (maybe it was a feature hahaha but couldn't tell the diff between alpha and solid scales)
• Adds additional features/functionality
• Updates documentation or example code
• Other

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Summary

Alpha color scales (blueA, redA, irisA, etc.) were previously rendered on solid backgrounds making transparency levels hard to see.
Only blackA and whiteA overlays used the grid background pattern that clearly shows transparency.

This change applies the same grid background pattern to all alpha scales for visual consistency:

• Light alpha scales (*A) → white checkerboard
• Dark alpha scales (*DarkA) and whiteA → dark checkerboard
• Overlay appearance for blackA and whiteA remains unchanged

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