Address CSS anomolies after Tailwind 4 upgrade

[mitkins]

• Light button text wasn't right on hover (in dark mode)
• Table dividers set to border-gray-200 instead of currentColor
• Removed some unnecessary classes

[greptile-apps]

PR Summary

This PR addresses CSS styling anomalies following the Tailwind 4 upgrade, focusing on button and table component visual improvements.

• Fixed dark mode hover text color for light buttons by adding dark:hover:text-white class
• Changed table divider color from currentColor to border-gray-200 for better visibility
• Removed redundant border-transparent class from pure-white button variant since it already has border-white
• Improves visual consistency across light and dark modes

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