Dashboard und Schnellnavigation fix

LehrerApp.Desktop/App.axaml.cs

@@ -170,6 +170,7 @@ public class App : Application
         };
         search.OnQuickAddTask = startAsReminder => ShowQuickTaskDialog(startAsReminder, dash);
         search.OnQuickAddStudent = ShowAddStudentDialog;
+        search.OnQuickAddGroupDocumentation = () => ShowQuickGroupDocumentationDialog(dash);
 
         // StudentList → StudentDetail + Anlegen
         var sl = Services.GetRequiredService<StudentListViewModel>();
@@ -203,4 +204,26 @@ public class App : Application
         dashboard.RefreshCommand.Execute(null);
         Services.GetRequiredService<WorkTaskListViewModel>().Load();
     }
+
+    private static async Task ShowQuickGroupDocumentationDialog(DashboardViewModel dashboard)
+    {
+        if (Application.Current?.ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime
+            { MainWindow: { } owner }) return;
+
+        var subjects = Services.GetRequiredService<ISubjectRepository>().GetAll()
+            .ToDictionary(s => s.Id);
+        var options = Services.GetRequiredService<IGroupRepository>().GetAll()
+            .Where(g => g.IsActive)
+            .OrderBy(g => g.Name)
+            .Select(g => new GroupDocumentationOption(g.Id,
+                g.SubjectId is { } subjectId && subjects.TryGetValue(subjectId, out var subject)
+                    ? $"{g.Name} · {(string.IsNullOrWhiteSpace(subject.ShortName) ? subject.Name : subject.ShortName)}"
+                    : g.Name));
+        var vm = new GroupDocumentationQuickViewModel(options);
+        var dialog = new Views.Students.GroupDocumentationQuickDialog { DataContext = vm };
+        if (!await dialog.ShowDialog<bool>(owner) || vm.Result is null) return;
+
+        Services.GetRequiredService<IDocumentationRepository>().Save(vm.Result);
+        dashboard.RefreshCommand.Execute(null);
+    }
 }