use dark: utility for glows instead of light-dark

[carlosabadia]

No description provided.

[greptile-apps]

Greptile Summary

This PR modernizes CSS gradient styling in the Reflex web landing page components by replacing CSS light-dark() function calls with Tailwind's dark: utility classes. The changes affect two key files in the landing page views:

Changes Made:

• In hero.py: Converted two gradient elements ("big gradient" and "ellipse gradient") from using light-dark(#D4CAFE, #4329AC) to explicit bg-[radial-gradient(...)] and dark:bg-[radial-gradient(...)] declarations
• In start_building.py: Applied the same pattern to glowing box gradient elements
• Minor code quality fix: Removed unnecessary f-string prefix from a static string path

Technical Details:
The gradients maintain identical visual appearance - light purple (#D4CAFE) in light mode transitioning to dark purple (#4329AC) in dark mode. The radial gradients create glowing effects with blur and opacity styling for visual enhancement of the hero section and start building components.

Integration with Codebase:
This change aligns with Reflex's existing theming system, which already uses Tailwind's dark mode utilities throughout the documentation and styling components. The modification follows the same pattern used in other parts of the application where dark mode is handled via Tailwind's dark: prefix rather than CSS functions. This creates consistency with the broader styling architecture where components like the theming documentation demonstrate similar dark mode toggle functionality using Tailwind utilities.

Confidence score: 5/5

• This PR is extremely safe to merge with minimal risk of any issues
• Score reflects simple, well-tested styling changes that improve browser compatibility without altering functionality
• No files require special attention as the changes are straightforward CSS utility replacements

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