Sweep: Change the install app button color to green

[sweep-ai[bot]]

Description

This pull request updates the color scheme of the "Install App" button in the CallToAction component from purple to green, enhancing the visual appeal and aligning with the new branding guidelines.

Summary

• Changed the colorScheme, bg, and _hover properties from purple to green in the CallToAction.tsx file, improving the button's visibility and consistency with the overall design theme.

Fixes #366.

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Rollback Files For Sweep

• [ ] Rollback changes to src/components/CallToAction.tsx

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