Initial

LehrerApp.Desktop/Views/Groups/GroupDetailView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Groups"
+             x:Class="LehrerApp.Desktop.Views.Groups.GroupDetailView"
+             x:DataType="vm:GroupDetailViewModel">
+
+  <Grid RowDefinitions="Auto,Auto,*">
+
+    <!-- ── Header ──────────────────────────────────────────────────────── -->
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto">
+        <StackPanel Grid.Column="0">
+          <TextBlock Text="{Binding GroupTitle}"
+                     FontSize="22" FontWeight="SemiBold"/>
+          <TextBlock FontSize="12" Opacity="0.5">
+            <Run Text="{Binding StudentCount}"/>
+            <Run Text="Schüler"/>
+          </TextBlock>
+        </StackPanel>
+        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+          <Button Content="+ Schüler"
+                  Command="{Binding AddStudentCommand}"/>
+          <Button Content="+ Klausur"
+                  Command="{Binding AddExamCommand}"/>
+        </StackPanel>
+      </Grid>
+    </Border>
+
+    <!-- ── Tab-Leiste ──────────────────────────────────────────────────── -->
+    <Border Grid.Row="1"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1"
+            Padding="16,0">
+      <StackPanel Orientation="Horizontal" Spacing="4">
+        <Button Content="Übersicht"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Overview}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Overview}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Schüler"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Students}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Students}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Klausuren"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Exams}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Exams}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Noten"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Grades}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Planung"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Planner}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Dokumentation"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Documentation}"
+                Background="Transparent" Padding="12,8"/>
+      </StackPanel>
+    </Border>
+
+    <!-- ── Tab-Inhalt ──────────────────────────────────────────────────── -->
+    <ScrollViewer Grid.Row="2" Padding="20">
+
+      <!-- Schülerliste -->
+      <DataGrid ItemsSource="{Binding Students}"
+                IsVisible="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Students}}"
+                AutoGenerateColumns="False"
+                IsReadOnly="True"
+                GridLinesVisibility="Horizontal"
+                CanUserReorderColumns="False"
+                CanUserResizeColumns="True">
+        <DataGrid.Columns>
+          <DataGridTextColumn Header="Name"
+                              Binding="{Binding FullName}"
+                              Width="*"/>
+        </DataGrid.Columns>
+      </DataGrid>
+
+      <!-- Klausuren -->
+      <DataGrid ItemsSource="{Binding Exams}"
+                IsVisible="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Exams}}"
+                AutoGenerateColumns="False"
+                IsReadOnly="True"
+                GridLinesVisibility="Horizontal"
+                CanUserReorderColumns="False">
+        <DataGrid.Columns>
+          <DataGridTextColumn Header="Datum"
+                              Binding="{Binding Date}"
+                              Width="100"/>
+          <DataGridTextColumn Header="Titel"
+                              Binding="{Binding Title}"
+                              Width="*"/>
+          <DataGridTextColumn Header="Status"
+                              Binding="{Binding Status}"
+                              Width="120"/>
+        </DataGrid.Columns>
+      </DataGrid>
+
+      <!-- Übersicht (Platzhalter) -->
+      <StackPanel IsVisible="{Binding ActiveTab,
+                    Converter={x:Static ObjectConverters.Equal},
+                    ConverterParameter={x:Static vm:GroupTab.Overview}}"
+                  Spacing="12">
+        <TextBlock Text="Übersicht" FontSize="16" FontWeight="SemiBold"/>
+        <TextBlock Text="Hier erscheint eine Zusammenfassung der Lerngruppe."
+                   Opacity="0.5"/>
+      </StackPanel>
+
+    </ScrollViewer>
+
+  </Grid>
+
+</UserControl>