refactor: enhance theme and error handling across the application

- Updated error handling in EnhancedErrorService to utilize context for color tokens, improving theme consistency.
- Refactored various components to use context-aware shadow and color properties, enhancing visual coherence.
- Replaced hardcoded color values with dynamic tokens in multiple widgets, ensuring better adaptability to theme changes.
- Improved overall code maintainability by centralizing theme-related logic and reducing direct dependencies on static theme values.

lib/shared/widgets/improved_loading_states.dart

@@ -297,7 +297,7 @@ class LoadingOverlay extends StatelessWidget {
                 decoration: BoxDecoration(
                   color: context.conduitTheme.cardBackground,
                   borderRadius: BorderRadius.circular(AppBorderRadius.card),
-                  boxShadow: ConduitShadows.card,
+                  boxShadow: ConduitShadows.card(context),
                 ),
                 child: ImprovedLoadingState(
                   message: message,