Restore UI functionalities and clean up dependencies

lib/features/home/home_screen.dart

@@ -6,6 +6,8 @@ import '../../data/repositories/session_repository.dart';
 import '../capture/capture_screen.dart';
 import '../history/history_screen.dart';
 import '../statistics/statistics_screen.dart';
+import 'package:fl_chart/fl_chart.dart';
+import '../../data/models/session.dart';
 import 'widgets/stats_card.dart';
 
 class HomeScreen extends StatefulWidget {
@@ -17,6 +19,7 @@ class HomeScreen extends StatefulWidget {
 
 class _HomeScreenState extends State<HomeScreen> {
   Map<String, dynamic>? _stats;
+  List<Session> _recentSessions = [];
   bool _isLoading = true;
 
   @override
@@ -28,9 +31,12 @@ class _HomeScreenState extends State<HomeScreen> {
   Future<void> _loadStats() async {
     final repository = context.read<SessionRepository>();
     final stats = await repository.getStatistics();
+    final sessions = await repository.getAllSessions();
+    
     if (mounted) {
       setState(() {
         _stats = stats;
+        _recentSessions = sessions;
         _isLoading = false;
       });
     }
@@ -181,11 +187,12 @@ class _HomeScreenState extends State<HomeScreen> {
           ],
         ),
 
-        // --- MODIFICATION 2 : AJOUT DU GRAPHIQUE AU MILIEU ---
+        // --- MODIFICATION 2 : GRAPHIQUE RÉEL (Restauré) ---
         Padding(
           padding: const EdgeInsets.symmetric(vertical: 16.0),
           child: Container(
             height: 150,
+            padding: const EdgeInsets.all(16),
             decoration: BoxDecoration(
               color: Colors.white,
               borderRadius: BorderRadius.circular(AppConstants.borderRadius),
@@ -197,9 +204,20 @@ class _HomeScreenState extends State<HomeScreen> {
                 ),
               ],
             ),
-            child: const Center(
-              child: Icon(Icons.show_chart, size: 50, color: Colors.grey),
-            ),
+            child: _recentSessions.length < 2
+                ? const Center(
+                    child: Column(
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      children: [
+                        Icon(Icons.show_chart, size: 40, color: Colors.grey),
+                        Text(
+                          'Pas assez de données',
+                          style: TextStyle(color: Colors.grey, fontSize: 12),
+                        ),
+                      ],
+                    ),
+                  )
+                : _buildHomeTrendChart(),
           ),
         ),
 
@@ -258,4 +276,38 @@ class _HomeScreenState extends State<HomeScreen> {
     );
     _loadStats();
   }
+
+  // --- WIDGET DU GRAPHIQUE D'ACCUEIL ---
+
+  Widget _buildHomeTrendChart() {
+    // Trier par date et prendre les 7 dernières
+    final sorted = List<Session>.from(_recentSessions)
+      ..sort((a, b) => a.createdAt.compareTo(b.createdAt));
+    final display =
+        sorted.length > 7 ? sorted.sublist(sorted.length - 7) : sorted;
+
+    return LineChart(
+      LineChartData(
+        gridData: const FlGridData(show: false),
+        titlesData: const FlTitlesData(show: false),
+        borderData: FlBorderData(show: false),
+        lineBarsData: [
+          LineChartBarData(
+            spots: display.asMap().entries.map((e) {
+              return FlSpot(e.key.toDouble(), e.value.totalScore.toDouble());
+            }).toList(),
+            isCurved: true,
+            color: AppTheme.primaryColor,
+            barWidth: 4,
+            isStrokeCapRound: true,
+            dotData: const FlDotData(show: false),
+            belowBarData: BarAreaData(
+              show: true,
+              color: AppTheme.primaryColor.withOpacity(0.1),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
 }