fix(mdx): rehype pretty code title not showing in light mode

[RahimGuerfi]

This commit addresses visibility issues in light mode where the code block title was blending with the white background due to the "text-white" Tailwind class. To improve readability, I changed the title color to black for light themes and white for dark themes, ensuring better contrast and legibility across different modes.

Before applying the fix:

After applying the fix:

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[flixlix]

oh man, just saw this now after creating my PR #3552, but I still think my implementation is cleaner, with just text-foreground

[RahimGuerfi]

oh man, just saw this now after creating my PR #3552, but I still think my implementation is cleaner, with just text-foreground

it's okay and yeah your implementation is better

[shadcn]

This PR has been automatically marked as stale due to one year of inactivity. It will be closed in 7 days unless there’s further input. If you believe this PR is still relevant, please leave a comment or provide updated details. Thank you.

[shadcn]

This PR has been automatically closed due to one year of inactivity. Thank you for your understanding!