Polished context menus on files and grade average calculator

lib/view/pages/more/gradeAverages/gradeAverage.dart

@@ -68,14 +68,14 @@ class _GradeAverageState extends State<GradeAverage> {
             }, icon: const Icon(Icons.delete_forever)),
           ),
           PopupMenuButton<bool>(
-            enableFeedback: true,
             initialValue: gradeSystem,
             icon: const Icon(Icons.more_horiz),
             itemBuilder: (context) => [true, false].map((e) => PopupMenuItem<bool>(
               value: e,
-              enabled: e != gradeSystem,
               child: Row(
                 children: [
+                  Icon(e ? Icons.calculate_outlined : Icons.school_outlined, color: Theme.of(context).colorScheme.onSurface),
+                  const SizedBox(width: 15),
                   Text(e ? "Notensystem" : "Punktesystem"),
                 ],
               ),
@@ -102,8 +102,6 @@ class _GradeAverageState extends State<GradeAverage> {
               } else {
                 switchSystem();
               }
-
-
             },
           ),
         ],