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/pages/roles_and_permission/view/roles_page.dart

@@ -32,7 +32,7 @@ class RolesPage extends StatelessWidget {
             controller: searchController,
             style: const TextStyle(color: Colors.black),
             decoration: textBoxDecoration(radios: 15)!.copyWith(
-                fillColor: ColorsManager.whiteColors,
+                fillColor: ColorsManager.white,
                 errorStyle: const TextStyle(height: 0),
                 hintStyle: context.textTheme.titleSmall?.copyWith(
                   color: Colors.grey,