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/spaces_management/space_model/view/space_model_page.dart

@@ -18,7 +18,10 @@ class SpaceModelPage extends StatelessWidget {
   final List<Tag> projectTags;
 
   const SpaceModelPage(
-      {Key? key, this.products, this.onSpaceModelsUpdated, required this.projectTags})
+      {Key? key,
+      this.products,
+      this.onSpaceModelsUpdated,
+      required this.projectTags})
       : super(key: key);
 
   @override
@@ -39,7 +42,7 @@ class SpaceModelPage extends StatelessWidget {
           }
 
           return Scaffold(
-            backgroundColor: ColorsManager.whiteColors,
+            backgroundColor: ColorsManager.white,
             body: Padding(
               padding: const EdgeInsets.fromLTRB(20.0, 16.0, 16.0, 16.0),
               child: Column(
@@ -115,8 +118,10 @@ class SpaceModelPage extends StatelessWidget {
           return Center(
             child: Text(
               'Error: ${state.message}',
-              style:
-                  Theme.of(context).textTheme.bodySmall?.copyWith(color: ColorsManager.warningRed),
+              style: Theme.of(context)
+                  .textTheme
+                  .bodySmall
+                  ?.copyWith(color: ColorsManager.warningRed),
             ),
           );
         }