refactor: enhance error handling and theming in EnhancedErrorService

- Updated the EnhancedErrorService to utilize the dynamic theme context for improved color handling in SnackBars and AlertDialogs.
- Replaced hardcoded color values with theme-based colors to ensure better accessibility and visual consistency across the application.
- Added context parameter to various components to facilitate theme integration, enhancing the overall user experience.
- Improved the readability of error messages by applying appropriate text colors based on the current theme.

lib/core/error/enhanced_error_service.dart

@@ -99,6 +99,8 @@ class EnhancedErrorService {
     final message = getUserMessage(error);
     final isRetryableError = isRetryable(error);
     final retryDelay = getRetryDelay(error);
+    final theme = context.conduitTheme;
+    final inverseColor = theme.textInverse;
 
     final snackBar = SnackBar(
       content: Column(
@@ -109,15 +111,12 @@ class EnhancedErrorService {
             children: [
               Icon(
                 _getErrorIcon(error),
-                color: AppTheme.neutral50,
+                color: inverseColor,
                 size: IconSize.md,
               ),
               const SizedBox(width: Spacing.sm),
               Expanded(
-                child: Text(
+                child: Text(message, style: TextStyle(color: inverseColor)),
-                  message,
-                  style: const TextStyle(color: AppTheme.neutral50),
-                ),
               ),
             ],
           ),
@@ -126,7 +125,7 @@ class EnhancedErrorService {
             Text(
               getTechnicalDetails(error),
               style: TextStyle(
-                color: AppTheme.neutral50.withValues(alpha: Alpha.strong),
+                color: inverseColor.withValues(alpha: Alpha.strong),
                 fontSize: AppTypography.labelMedium,
               ),
             ),
@@ -140,7 +139,7 @@ class EnhancedErrorService {
               label: retryDelay != null && retryDelay.inSeconds > 5
                   ? "${AppLocalizations.of(context)!.retry} (${retryDelay.inSeconds}s)"
                   : AppLocalizations.of(context)!.retry,
-              textColor: AppTheme.neutral50,
+              textColor: inverseColor,
               onPressed: onRetry,
             )
           : null,
@@ -166,6 +165,7 @@ class EnhancedErrorService {
       context: context,
       barrierDismissible: true,
       builder: (BuildContext context) {
+        final theme = context.conduitTheme;
         return AlertDialog(
           title: Row(
             children: [
@@ -178,25 +178,29 @@ class EnhancedErrorService {
             mainAxisSize: MainAxisSize.min,
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
-              Text(message),
+              Text(message, style: TextStyle(color: theme.textPrimary)),
               if (showTechnicalDetails) ...[
                 const SizedBox(height: Spacing.md),
-                const Text(
+                Text(
                   'Technical Details:',
-                  style: TextStyle(fontWeight: FontWeight.bold),
+                  style: TextStyle(
+                    fontWeight: FontWeight.bold,
+                    color: theme.textPrimary,
+                  ),
                 ),
                 const SizedBox(height: Spacing.xs),
                 Container(
                   padding: const EdgeInsets.all(Spacing.sm),
                   decoration: BoxDecoration(
-                    color: AppTheme.neutral100,
+                    color: theme.surfaceContainer,
                     borderRadius: BorderRadius.circular(AppBorderRadius.xs),
                   ),
                   child: Text(
                     technicalDetails,
-                    style: const TextStyle(
+                    style: TextStyle(
                       fontFamily: AppTypography.monospaceFontFamily,
                       fontSize: AppTypography.labelMedium,
+                      color: theme.textSecondary,
                     ),
                   ),
                 ),
@@ -236,6 +240,7 @@ class EnhancedErrorService {
     final message = getUserMessage(error);
     final technicalDetails = getTechnicalDetails(error);
     final isRetryableError = isRetryable(error);
+    final theme = context.conduitTheme;
 
     return Container(
       padding: padding ?? const EdgeInsets.all(Spacing.md),
@@ -260,21 +265,22 @@ class EnhancedErrorService {
           Text(
             message,
             textAlign: TextAlign.center,
-            style: TextStyle(color: AppTheme.neutral600),
+            style: TextStyle(color: theme.textSecondary),
           ),
           if (showTechnicalDetails) ...[
             const SizedBox(height: Spacing.md),
             Container(
               padding: const EdgeInsets.all(Spacing.xs),
               decoration: BoxDecoration(
-                color: AppTheme.neutral100,
+                color: theme.surfaceContainer,
                 borderRadius: BorderRadius.circular(AppBorderRadius.sm),
               ),
               child: Text(
                 technicalDetails,
-                style: const TextStyle(
+                style: TextStyle(
                   fontFamily: AppTypography.monospaceFontFamily,
                   fontSize: AppTypography.labelMedium,
+                  color: theme.textSecondary,
                 ),
               ),
             ),

lib/features/auth/views/authentication_page.dart

@@ -314,6 +314,7 @@ class _AuthenticationPageState extends ConsumerState<AuthenticationPage> {
           size: 48,
           useGradient: true,
           addShadow: true,
+          context: context,
         ).animate().scale(
           duration: AnimationDuration.pageTransition,
           curve: Curves.easeOutBack,

lib/features/auth/views/server_connection_page.dart

@@ -356,6 +356,7 @@ class _ServerConnectionPageState extends ConsumerState<ServerConnectionPage> {
                 size: 64,
                 useGradient: true,
                 addShadow: true,
+                context: context,
               ),
               // Reviewer mode badge
               if (reviewerMode)

lib/shared/theme/theme_extensions.dart

@@ -1,3 +1,5 @@
+import 'dart:math' as math;
+
 import 'package:flutter/material.dart';
 // Using system fonts; no GoogleFonts dependency required
 import 'app_theme.dart';
@@ -505,10 +507,11 @@ class ConduitThemeExtension extends ThemeExtension<ConduitThemeExtension> {
   /// Dark theme extension derived from the active color palette.
   static ConduitThemeExtension darkPalette(AppColorPalette palette) {
     final darkTone = palette.dark;
+    final onDarkPrimary = _onSurfaceColor(darkTone.primary);
     return ConduitThemeExtension(
       chatBubbleUser: darkTone.primary,
       chatBubbleAssistant: const Color(0xFF0E1010),
-      chatBubbleUserText: AppTheme.neutral50,
+      chatBubbleUserText: onDarkPrimary,
       chatBubbleAssistantText: AppTheme.neutral50,
       chatBubbleUserBorder: darkTone.secondary,
       chatBubbleAssistantBorder: const Color(0xFF1A1D1C),
@@ -525,7 +528,7 @@ class ConduitThemeExtension extends ThemeExtension<ConduitThemeExtension> {
       surfaceContainer: const Color(0xFF0C0F0E),
       surfaceContainerHighest: const Color(0xFF121514),
       buttonPrimary: darkTone.primary,
-      buttonPrimaryText: AppTheme.neutral50,
+      buttonPrimaryText: onDarkPrimary,
       buttonSecondary: const Color(0xFF151918),
       buttonSecondaryText: AppTheme.neutral50,
       buttonDisabled: AppTheme.neutral600,
@@ -622,10 +625,11 @@ class ConduitThemeExtension extends ThemeExtension<ConduitThemeExtension> {
   static ConduitThemeExtension lightPalette(AppColorPalette palette) {
     final lightTone = palette.light;
     final darkTone = palette.dark;
+    final onLightPrimary = _onSurfaceColor(lightTone.primary);
     return ConduitThemeExtension(
       chatBubbleUser: lightTone.primary,
       chatBubbleAssistant: const Color(0xFFF7F7F7),
-      chatBubbleUserText: AppTheme.neutral50,
+      chatBubbleUserText: onLightPrimary,
       chatBubbleAssistantText: const Color(0xFF1C1C1C),
       chatBubbleUserBorder: darkTone.primary,
       chatBubbleAssistantBorder: const Color(0xFFE7E7E7),
@@ -642,7 +646,7 @@ class ConduitThemeExtension extends ThemeExtension<ConduitThemeExtension> {
       surfaceContainer: const Color(0xFFF7F7F7),
       surfaceContainerHighest: const Color(0xFFF0F1F1),
       buttonPrimary: lightTone.primary,
-      buttonPrimaryText: AppTheme.neutral50,
+      buttonPrimaryText: onLightPrimary,
       buttonSecondary: const Color(0xFFF0F1F1),
       buttonSecondaryText: const Color(0xFF1C1C1C),
       buttonDisabled: AppTheme.neutral300,
@@ -738,6 +742,22 @@ class ConduitThemeExtension extends ThemeExtension<ConduitThemeExtension> {
   static Color _surfaceTint(Color tone, Color surface, double opacity) {
     return Color.alphaBlend(tone.withValues(alpha: opacity), surface);
   }
+
+  static Color _onSurfaceColor(Color background) {
+    final contrastOnLight = _contrastRatio(background, AppTheme.neutral50);
+    final contrastOnDark = _contrastRatio(background, AppTheme.neutral900);
+    return contrastOnLight >= contrastOnDark
+        ? AppTheme.neutral50
+        : AppTheme.neutral900;
+  }
+
+  static double _contrastRatio(Color a, Color b) {
+    final luminanceA = a.computeLuminance();
+    final luminanceB = b.computeLuminance();
+    final lighter = math.max(luminanceA, luminanceB);
+    final darker = math.min(luminanceA, luminanceB);
+    return (lighter + 0.05) / (darker + 0.05);
+  }
 }
 
 /// Extension method to easily access Conduit theme from BuildContext

lib/shared/widgets/conduit_components.dart

@@ -557,6 +557,7 @@ class ConduitAvatar extends StatelessWidget {
     return BrandService.createBrandAvatar(
       size: isCompact ? size * 0.8 : size,
       fallbackText: text,
+      context: context,
     );
   }
 }