Filtre par date de création / date d'échéance OK"

lib/features/tasks/presentation/providers/task_provider.dart

@@ -7,7 +7,7 @@ class TaskProvider extends ChangeNotifier {
   // ===== DONNÉES PRIVÉES =====
   final List<Task> _tasks = [];
   TaskFilter _currentFilter = TaskFilter.all;
-  TaskSort _currentSort = TaskSort.newest;
+  TaskSort _currentSort = TaskSort.createdAt;
   bool _isLoading = false;
 
   // ===== GETTERS PUBLICS =====
@@ -119,15 +119,15 @@ class TaskProvider extends ChangeNotifier {
   /// Appliquer le tri actuel
   List<Task> _applySort(List<Task> tasks) {
     switch (_currentSort) {
-      case TaskSort.newest:
+      case TaskSort.createdAt:
         return tasks..sort((a, b) => b.createdAt.compareTo(a.createdAt));
-      case TaskSort.oldest:
-        return tasks..sort((a, b) => a.createdAt.compareTo(b.createdAt));
-      case TaskSort.priority:
+      case TaskSort.dueDate:
         return tasks
-          ..sort((a, b) => b.priority.value.compareTo(a.priority.value));
-      case TaskSort.alphabetical:
-        return tasks..sort((a, b) => a.title.compareTo(b.title));
+          ..sort((a, b) {
+            final aDate = a.dueDate ?? DateTime(9999);
+            final bDate = b.dueDate ?? DateTime(9999);
+            return aDate.compareTo(bDate);
+          });
     }
   }
 
@@ -201,10 +201,8 @@ enum TaskFilter {
 
 /// Options de tri pour les tâches
 enum TaskSort {
-  newest('Plus récentes'),
-  oldest('Plus anciennes'),
-  priority('Par priorité'),
-  alphabetical('Alphabétique');
+  createdAt('Date de création'),
+  dueDate('Date d\'échéance');
 
   const TaskSort(this.label);
   final String label;

lib/features/tasks/presentation/screens/task_list_screen.dart

@@ -15,6 +15,7 @@ import '../widgets/task_filter_chips.dart';
 import '../widgets/task_modal.dart';
 import '../widgets/task_stats_card.dart';
 import '../widgets/task_tile.dart';
+import '../widgets/task_sort_button.dart';
 
 /// Écran principal des tâches avec interface moderne
 class TaskListScreen extends StatefulWidget {
@@ -172,6 +173,7 @@ class _TaskListScreenState extends State<TaskListScreen>
         ),
       ),
       actions: [
+        const TaskSortButton(),
         // ✅ DEBUG : Voir l'état du thème
         Consumer<ThemeProvider>(
           builder: (context, themeProvider, child) {

lib/features/tasks/presentation/widgets/task_sort_button.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../providers/task_provider.dart';
+
+/// Bouton d'options pour trier les tâches
+class TaskSortButton extends StatelessWidget {
+  const TaskSortButton({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Consumer<TaskProvider>(
+      builder: (context, taskProvider, child) {
+        return PopupMenuButton<TaskSort>(
+          initialValue: taskProvider.currentSort,
+          onSelected: taskProvider.setSort,
+          icon: const Icon(Icons.sort, color: Colors.white),
+          itemBuilder: (context) => [
+            PopupMenuItem(
+              value: TaskSort.createdAt,
+              child: Text(TaskSort.createdAt.label),
+            ),
+            PopupMenuItem(
+              value: TaskSort.dueDate,
+              child: Text(TaskSort.dueDate.label),
+            ),
+          ],
+        );
+      },
+    );
+  }
+}