feat: add goal line to progress chart

lib/android/config/statistics.dart

@@ -214,6 +214,11 @@ class StatisticsService {
     return sum as int;
   }
 
+  double getCaloryTargetForOneDay(){
+    final Box userBox = Hive.box<User>("USER_BOX");
+    return userBox.get("USER").kalorien.toDouble();
+  }
+
   List<double> getAllEatenIngredientsForTodayStatistics(double dayLen){
     Box box = Hive.box(todayStatisticsBoxName);
     final Box userBox = Hive.box<User>("USER_BOX");

lib/android/pages/nav_pages/progress_page.dart

@@ -169,6 +169,20 @@ class ProgressPage extends StatelessWidget {
                                       barGroups: value,
                                       gridData: FlGridData(show: false),
                                       alignment: BarChartAlignment.spaceAround,
+                                      extraLinesData: ExtraLinesData(
+                                        horizontalLines: [
+                                          HorizontalLine(
+                                            y: StatisticsService.instance.getCaloryTargetForOneDay(), // Specify the y-value where you want the line to be positioned
+                                            color: Colors.black, // Change the color as per your requirement
+                                            strokeWidth: 2, // Adjust the width as needed
+                                            dashArray: [3, 2],
+                                            label: HorizontalLineLabel(
+                                              show: true,
+                                              labelResolver: (x) => "Zielwert"
+                                            )
+                                          ),
+                                        ],
+                                      ),
                                     ),
                                   ),
                                 ),