Merge backend branch and restore functionalities

lib/features/home/home_screen.dart

@@ -8,6 +8,7 @@ import '../history/history_screen.dart';
 import '../statistics/statistics_screen.dart';
 import 'package:fl_chart/fl_chart.dart';
 import '../../data/models/session.dart';
+import '../settings/settings_screen.dart';
 import 'widgets/stats_card.dart';
 
 class HomeScreen extends StatefulWidget {
@@ -65,6 +66,11 @@ class _HomeScreenState extends State<HomeScreen> {
             onPressed: () => _navigateToHistory(context),
             tooltip: 'Historique',
           ),
+          IconButton(
+            icon: const Icon(Icons.settings),
+            onPressed: () => _navigateToSettings(context),
+            tooltip: 'Paramètres',
+          ),
         ],
       ),
       body: RefreshIndicator(
@@ -310,4 +316,11 @@ class _HomeScreenState extends State<HomeScreen> {
       ),
     );
   }
+
+  void _navigateToSettings(BuildContext context) {
+    Navigator.push(
+      context,
+      MaterialPageRoute(builder: (_) => const SettingsScreen()),
+    );
+  }
 }