refactoring

lib/app/app.dart

@@ -1,6 +1,6 @@
 /// Configuration principale de l'application UnionFlow
-/// 
-/// Contient la configuration globale de l'app avec thème, localisation et navigation
+///
+/// Thème dynamique (light/dark) via ThemeProvider + localisation + navigation
 library app;
 
 import 'package:flutter/material.dart';
@@ -11,37 +11,49 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import '../shared/design_system/theme/app_theme_sophisticated.dart';
 import '../features/authentication/presentation/bloc/auth_bloc.dart';
 import '../core/l10n/locale_provider.dart';
+import '../core/theme/theme_provider.dart';
 import '../core/di/injection.dart';
 import 'router/app_router.dart';
 
-/// Application principale avec système d'authentification Keycloak
+/// Application principale UnionFlow
 class UnionFlowApp extends StatelessWidget {
   final LocaleProvider localeProvider;
+  final ThemeProvider themeProvider;
 
-  const UnionFlowApp({super.key, required this.localeProvider});
+  /// Clé globale pour afficher des SnackBars sans BuildContext (ex: session expirée)
+  static final GlobalKey<ScaffoldMessengerState> scaffoldMessengerKey =
+      GlobalKey<ScaffoldMessengerState>();
+
+  const UnionFlowApp({
+    super.key,
+    required this.localeProvider,
+    required this.themeProvider,
+  });
 
   @override
   Widget build(BuildContext context) {
     return MultiProvider(
       providers: [
         ChangeNotifierProvider.value(value: localeProvider),
+        ChangeNotifierProvider.value(value: themeProvider),
         BlocProvider(
           create: (context) => getIt<AuthBloc>()..add(const AuthStatusChecked()),
         ),
       ],
-      child: Consumer<LocaleProvider>(
-        builder: (context, localeProvider, child) {
+      child: Consumer2<LocaleProvider, ThemeProvider>(
+        builder: (context, locale, theme, child) {
           return MaterialApp(
             title: 'UnionFlow',
             debugShowCheckedModeBanner: false,
+            scaffoldMessengerKey: UnionFlowApp.scaffoldMessengerKey,
 
-            // Configuration du thème
+            // Thème dynamique piloté par ThemeProvider
             theme: AppThemeSophisticated.lightTheme,
             darkTheme: AppThemeSophisticated.darkTheme,
-            themeMode: ThemeMode.system,
+            themeMode: theme.mode,
 
-            // Configuration de la localisation
-            locale: localeProvider.locale,
+            // Localisation
+            locale: locale.locale,
             supportedLocales: LocaleProvider.supportedLocales,
             localizationsDelegates: const [
               AppLocalizations.delegate,
@@ -50,13 +62,11 @@ class UnionFlowApp extends StatelessWidget {
               GlobalCupertinoLocalizations.delegate,
             ],
 
-        // Configuration des routes
-        routes: AppRouter.routes,
+            // Routes
+            routes: AppRouter.routes,
+            initialRoute: AppRouter.initialRoute,
 
-        // Page d'accueil par défaut
-        initialRoute: AppRouter.initialRoute,
-
-            // Builder global pour gérer les erreurs
+            // Fix textScaler global
             builder: (context, child) {
               return MediaQuery(
                 data: MediaQuery.of(context).copyWith(