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/features/chat/widgets/user_message_bubble.dart

@@ -563,13 +563,7 @@ class _UserMessageBubbleState extends ConsumerState<UserMessageBubble>
                                     context.conduitTheme.chatBubbleUserBorder,
                                 width: BorderWidth.regular,
                               ),
-                              boxShadow: [
-                                BoxShadow(
-                                  color: Colors.black.withValues(alpha: 0.08),
-                                  blurRadius: 4,
-                                  offset: const Offset(0, 2),
-                                ),
-                              ],
+                              boxShadow: ConduitShadows.small(context),
                             ),
                             child: _isEditing
                                 ? Focus(