- Updated background and border colors in DashboardWidget, DialogWidget, MessageboxWidget, and TermineWidget to use new CSS variables for consistency.
- Changed button colors in various widgets and dialogs to utilize the new primary color variable.
- Adjusted text colors in VocabCourseView, VocabDictionaryView, and VocabTrainerView to align with the new color scheme.
- Replaced hardcoded colors with CSS variables in multiple components for improved maintainability and theming.
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