feat: Modernisation UI/UX et configuration Flutter multi-plateforme

Phase 1 - Corrections Critiques:
- Fixed memory leaks dans music_provider.dart (stream subscriptions)
- Fixed race conditions dans search_provider.dart (stale results)
- Fixed token refresh errors dans api_service.dart
- Improved error handling avec messages utilisateur
- Changed API URL to HTTPS by default

Phase 2 - Améliorations UX Desktop:
- Ajouté cursor pointers sur tous les éléments cliquables
- Implémenté hover states avec effets néon glow (200ms transitions)
- Créé skeleton loading states avec shimmer animation
- Ajouté widgets: ClickableWrapper, ErrorDisplay, SkeletonLoading
- Enhanced visual feedback pour desktop users

Phase 3 - Configuration Flutter:
- Configuré Android (Gradle 8.1.0, Kotlin 1.9.0, minSdk 21, targetSdk 34)
- Créé launcher icons cyberpunk néon (5 densités)
- Configuré Windows desktop (structure complète)
- Activé Linux desktop support
- Ajouté package équatable pour entités de domaine
- Corrigé imports (colors.dart, auth_provider.dart)
- Fixed Dio API compatibility (RequestOptions)

Documentation:
- STYLE_GUIDE.md: Guide complet (100+ pages)
- DESIGN_IMPLEMENTATION_GUIDE.md: Implémentation Flutter
- BUILD_STATUS.md: Status builds + troubleshooting
- QUICKSTART_BUILDS.md: Guide rapide
- BUILD_INDEX.md: Index documentation
- PHASE_1_CORRECTIONS.md: Corrections Phase 1
- PHASE_2_UX_IMPROVEMENTS.md: Améliorations Phase 2
- PR_REVIEW_SUMMARY.md: Revue code complète
- CODE_ANALYSIS_AND_PRIORITIES.md: Analyse code

Scripts & Builds:
- BUILD_ALL.sh: Script automatisé builds multi-plateforme
- builds/: Structure avec README par plateforme
- design-system/: Système de design complet

Backend:
- Ajouté streaming HTTP Range pour audio progressif
- Enhanced YouTube service avec métadonnées complètes
- Improved error handling et validation

Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

frontend/lib/infrastructure/datasources/remote/api_service.dart

@@ -2,11 +2,12 @@
 library;
 
 import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:pretty_dio_logger/pretty_dio_logger.dart';
 
 import '../../../core/constants/api_constants.dart';
-import '../../providers/auth_provider.dart';
+import '../../../presentation/providers/auth_provider.dart';
 
 /// API Service provider
 final apiServiceProvider = Provider<Dio>((ref) {
@@ -26,17 +27,19 @@ final apiServiceProvider = Provider<Dio>((ref) {
 
   final dio = Dio(options);
 
-  // Add logger in debug mode
-  dio.interceptors.add(
-    PrettyDioLogger(
-      requestHeader: true,
-      requestBody: true,
-      responseBody: true,
-      responseHeader: false,
-      error: true,
-      compact: true,
-    ),
-  );
+  // Add logger ONLY in debug mode to prevent exposing sensitive data in production
+  if (kDebugMode) {
+    dio.interceptors.add(
+      PrettyDioLogger(
+        requestHeader: true,
+        requestBody: true,
+        responseBody: true,
+        responseHeader: false,
+        error: true,
+        compact: true,
+      ),
+    );
+  }
 
   // Add token refresh interceptor
   dio.interceptors.add(
@@ -48,18 +51,42 @@ final apiServiceProvider = Provider<Dio>((ref) {
             final newToken = await ref.read(authProvider.notifier).refreshToken();
             if (newToken != null) {
               // Retry original request with new token
-              final opts = options.copyWith(
+              final opts = RequestOptions(
+                path: error.requestOptions.path,
+                data: error.requestOptions.data,
+                onReceiveProgress: error.requestOptions.onReceiveProgress,
+                onSendProgress: error.requestOptions.onSendProgress,
+                queryParameters: error.requestOptions.queryParameters,
+                cancelToken: error.requestOptions.cancelToken,
                 headers: {
-                  ...options.headers,
+                  ...error.requestOptions.headers,
                   'Authorization': 'Bearer $newToken',
                 },
+                extra: error.requestOptions.extra,
+                method: error.requestOptions.method,
+                responseType: error.requestOptions.responseType,
+                validateStatus: error.requestOptions.validateStatus,
               );
-              final clonedReq = await dio.fetch(opts..path = error.requestOptions.path);
+              final clonedReq = await dio.fetch(opts);
               return handler.resolve(clonedReq);
             }
-          } catch (e) {
+          } on DioException catch (e) {
+            // Log the specific error for debugging
+            debugPrint('Token refresh failed: ${e.type} - ${e.message}');
+
+            // Notify user before logout
+            // Note: In a real app, you'd want to show a snackbar or dialog here
+            // For now, we just log the user out with a clear message
+            debugPrint('Your session has expired. Please log in again.');
+
             // Refresh failed, logout user
-            ref.read(authProvider.notifier).logout();
+            await ref.read(authProvider.notifier).logout();
+          } catch (e) {
+            // Log unexpected errors
+            debugPrint('Unexpected error during token refresh: $e');
+
+            // Logout on any error
+            await ref.read(authProvider.notifier).logout();
           }
         }
         return handler.next(error);