fix: improve resources banner contrast

[saurabhhhcodes]

Closes #182

Summary

• Add an explicit readable text color to the Resources safety banner.
• Keep the existing light gradient and ensure dark mode does not inherit low-contrast text.

Validation

• npm run build
• git diff --check
• npm run lint (blocked by the repository's existing ESLint/@typescript-eslint rule incompatibility before file linting)

[netlify]

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