Fix DropdownMenuInput border

[bosiraphael]

[greptile-apps]

PR Summary

This PR addresses the border styling of the DropdownMenuInput component, enhancing visual feedback and consistency with the design system.

• Modified packages/twenty-front/src/modules/ui/layout/dropdown/components/DropdownMenuInput.tsx to add a blue border color when focused and not in error state
• Adjusted padding of the error message in DropdownMenuInput for improved visual alignment
• Enhanced visual feedback for user interaction in the DropdownMenuInput component
• Aligned DropdownMenuInput styling with the overall design system for better consistency

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