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/utils/conversation_context_menu.dart

@@ -84,7 +84,7 @@ Future<void> showConduitContextMenu({
           decoration: BoxDecoration(
             color: theme.surfaceBackground,
             borderRadius: BorderRadius.circular(AppBorderRadius.lg),
-            boxShadow: ConduitShadows.modal,
+            boxShadow: ConduitShadows.modal(context),
           ),
           child: Column(
             mainAxisSize: MainAxisSize.min,