Stunde/Einheit-Dialog: Gruppe + Fach anzeigen, nicht nur Fach

Bei einer Klasse, die in mehreren Fächern unterrichtet wird (mehrere
LearningGroup-Datensätze mit gleichem Namen, z.B. zwei "10c"), zeigte
UnitDialog bisher nur das Fach ("Fach: Chemie"), LessonDialog gar keinen
Gruppen-/Fach-Hinweis. Beide zeigen jetzt "Gruppe · Fach" (z.B. "10c ·
Chemie") direkt unter dem Dialogtitel, nicht editierbar, nur zur Einordnung.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

LehrerApp.Desktop/Views/Groups/LessonDialog.axaml

@@ -10,7 +10,10 @@
   <Grid RowDefinitions="*,Auto" Margin="24">
     <ScrollViewer Grid.Row="0">
       <StackPanel Spacing="14" Margin="0,0,12,0">
-        <TextBlock Text="{Binding DialogTitle}" Classes="dialogtitle"/>
+        <StackPanel Spacing="2">
+          <TextBlock Text="{Binding DialogTitle}" Classes="dialogtitle"/>
+          <TextBlock Text="{Binding GroupSubjectDisplay}" FontSize="12" Opacity="0.6"/>
+        </StackPanel>
 
         <Grid ColumnDefinitions="*,12,*,12,*,12,*">
           <StackPanel Grid.Column="0" Spacing="4">

LehrerApp.Desktop/Views/Groups/PlanningTabView.axaml.cs

@@ -41,7 +41,7 @@ public partial class PlanningTabView : UserControl
         var dialogVm = new UnitDialogViewModel(
             App.Services.GetRequiredService<IUnitRepository>(),
             App.Services.GetRequiredService<ICompetencyDomainRepository>(),
-            groupId, vm.SubjectId, vm.GradeLevel, vm.SubjectName, editingUnit);
+            groupId, vm.SubjectId, vm.GradeLevel, vm.GroupLabel, vm.SubjectName, editingUnit);
 
         var dialog = new UnitDialog { DataContext = dialogVm };
         var owner = TopLevel.GetTopLevel(this) as Window;
@@ -80,13 +80,16 @@ public partial class PlanningTabView : UserControl
     private async Task<bool> ShowLessonDialog(Guid unitId, Guid groupId,
         List<string> materialSuggestions, List<string> shorthandHistorySuggestions, Lesson? editingLesson)
     {
+        if (DataContext is not PlanningTabViewModel vm) return false;
+
         var dialogVm = new LessonDialogViewModel(
             App.Services.GetRequiredService<ILessonRepository>(),
             App.Services.GetRequiredService<IShorthandCodeRepository>(),
             App.Services.GetRequiredService<IAlternativeLessonPathRepository>(),
             App.Services.GetRequiredService<ITimetableSlotRepository>(),
             App.Services.GetRequiredService<PeriodScheduleService>(),
-            unitId, groupId, materialSuggestions, shorthandHistorySuggestions, editingLesson);
+            unitId, groupId, vm.GroupLabel, vm.SubjectName,
+            materialSuggestions, shorthandHistorySuggestions, editingLesson);
 
         var dialog = new LessonDialog { DataContext = dialogVm };
         var owner = TopLevel.GetTopLevel(this) as Window;

LehrerApp.Desktop/Views/Groups/UnitDialog.axaml

@@ -12,7 +12,7 @@
       <StackPanel Spacing="14" Margin="0,0,12,0">
         <StackPanel Spacing="2">
           <TextBlock Text="{Binding DialogTitle}" Classes="dialogtitle"/>
-          <TextBlock Text="{Binding SubjectDisplay}" FontSize="12" Opacity="0.6"/>
+          <TextBlock Text="{Binding GroupSubjectDisplay}" FontSize="12" Opacity="0.6"/>
         </StackPanel>
 
         <StackPanel Spacing="4">