Update dependencies, enhance API endpoints, and refactor UI components

- Updated `pubspec.lock` to new package versions for `async`, `fake_async`, `leak_tracker`, and `vm_service`.
- Modified API endpoint for unread notifications to include `event_type=PUSH`.
- Refactored `CompletionOfDocumentsMobilePage` layout for improved structure.
- Simplified `DetailDropDown` widget by removing unnecessary animations.
- Updated `CommentBox` styling and adjusted padding for better UI consistency.
- Replaced deprecated `FormCard` implementation in final completion pages with a new widget structure.
- Enhanced button styles across various dialogs and pages for a cohesive design.

lib/views/home/tenders_list_item.dart

@@ -124,7 +124,7 @@ class TendersListItem extends StatelessWidget {
                   const Spacer(),
                   BaseButton(
                     text: HomeStrings.seeMoreButton,
-                    backgroundColor: AppColors.primary2,
+                    backgroundColor: AppColors.primary20,
                     isEnabled: true,
                     width: 100.0.w(),
                     height: 40.0.h(),