* fix: update scrollbar styles to follow theme variables
* fix: update theme colors to use CSS variables for consistency
* fix: change login button color to primary for better visibility
* fix: update theme colors for Dark and Light themes; change login button color to secondary
* fix: update border and theme colors for consistency in DarkTheme
* fix: update sidebar list class to conditionally hide scrollbar in mini sidebar mode
* fix: simplify button visibility logic and remove unnecessary leftPadding style
* fix: refactor language switcher to use grouped menu for better UX
* fix: update theme colors to use primary color for consistency across components
* fix: add preview text for template output in multiple languages