Fixing issue of scroll paddings in Navigation Drawer

[muraliSingh7]

This PR fixes the issue #9026

Screenshot:

[greptile-apps]

PR Summary

This PR fixes scroll padding issues in the Navigation Drawer by ensuring proper scrollbar visibility and preventing overlap with navigation items.

• Removed scrollHide={true} from ScrollWrapper in packages/twenty-front/src/modules/navigation/components/MainNavigationDrawerItems.tsx to show scrollbar
• Added theme-based spacing and width calculations in packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/NavigationDrawerItem.tsx for better layout
• Implemented margin-right in packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/NavigationDrawerSectionTitle.tsx to prevent scrollbar overlap
• Improved text overflow handling with ellipsis in navigation items
• Optimized spacer component rendering to appear only when needed

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