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/offline_indicator.dart

@@ -105,7 +105,7 @@ class _BackOnlineToast extends StatelessWidget {
                         borderRadius: BorderRadius.circular(
                           AppBorderRadius.round,
                         ),
-                        boxShadow: ConduitShadows.low,
+                        boxShadow: ConduitShadows.low(context),
                       ),
                       child: Text(
                         // Reuse existing l10n; otherwise add a dedicated "Back online" key later