Refactor color management and UI components for consistency

- Updated color references in various widgets to use the new `opaquePrimary` color for better visual consistency.
- Refactored `ColorsManager` to improve color definitions and removed redundant color declarations.
- Enhanced UI elements across multiple dialogs and widgets to ensure a cohesive design language.

This change promotes maintainability and aligns with the updated color scheme.

lib/utils/theme/responsive_text_theme.dart

@@ -24,7 +24,7 @@ class ResponsiveTextTheme extends ThemeExtension<ResponsiveTextTheme> {
           deviceManagementTitle: TextStyle(
               fontSize: isMobile ? 20 : 30,
               fontWeight: FontWeight.w700,
-              color: ColorsManager.whiteColors),
+              color: ColorsManager.white),
         );
   }
 }