[Bug] Dark Theme on Guide Page

[Eshita-Badhe]

Description
Some icons do not appear properly in Dark Theme, likely due to contrast or fill/stroke styling issues.

Suggested Changes

• Fix icon visibility in dark mode by adjusting color variables
• Add theme-specific overrides if necessary

Screenshot

Note: I would like to work on this under SWoC26.

[github-actions]

Thanks @Eshita-Badhe! 👋
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