Initial

LehrerApp.Desktop/Views/Groups/GroupListView.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.GroupListView"
+             x:DataType="vm:GroupListViewModel">
+
+  <Grid RowDefinitions="Auto,*">
+
+    <!-- ── Toolbar ─────────────────────────────────────────────────────── -->
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto,Auto">
+
+        <StackPanel Grid.Column="0">
+          <TextBlock Text="Lerngruppen" FontSize="22" FontWeight="SemiBold"/>
+          <TextBlock FontSize="12" Opacity="0.5">
+            <Run Text="{Binding Groups.Count}"/>
+            <Run Text="Gruppen ·"/>
+            <Run Text="{Binding SelectedSchoolYear}"/>
+          </TextBlock>
+        </StackPanel>
+
+        <!-- Schuljahr-Auswahl -->
+        <ComboBox Grid.Column="1"
+                  ItemsSource="{Binding SchoolYears}"
+                  SelectedItem="{Binding SelectedSchoolYear}"
+                  Width="100" Margin="0,0,8,0"
+                  VerticalAlignment="Center"/>
+
+        <!-- Neue Gruppe -->
+        <Button Grid.Column="2"
+                Content="+ Neue Gruppe"
+                Command="{Binding AddGroupCommand}"
+                VerticalAlignment="Center"/>
+      </Grid>
+    </Border>
+
+    <!-- ── Inhalt ──────────────────────────────────────────────────────── -->
+    <Grid Grid.Row="1" ColumnDefinitions="260,*">
+
+      <!-- Suchliste links -->
+      <Border Grid.Column="0"
+              BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+              BorderThickness="0,0,1,0">
+        <DockPanel>
+          <TextBox DockPanel.Dock="Top"
+                   Text="{Binding SearchText}"
+                   Watermark="Suchen…"
+                   Margin="12,8"/>
+          <ListBox ItemsSource="{Binding Groups}"
+                   SelectedItem="{Binding SelectedGroup}">
+            <ListBox.ItemTemplate>
+              <DataTemplate DataType="vm:GroupListItem">
+                <Grid ColumnDefinitions="4,*" Margin="0,4">
+                  <Border Grid.Column="0" Width="4" CornerRadius="2"
+                          Background="{DynamicResource SystemAccentColor}"
+                          Margin="0,0,10,0"/>
+                  <StackPanel Grid.Column="1">
+                    <Grid ColumnDefinitions="*,Auto">
+                      <TextBlock Grid.Column="0"
+                                 Text="{Binding Name}"
+                                 FontWeight="SemiBold" FontSize="13"/>
+                      <TextBlock Grid.Column="1"
+                                 Text="{Binding TypeLabel}"
+                                 FontSize="11" Opacity="0.5"/>
+                    </Grid>
+                    <TextBlock Text="{Binding Subject}"
+                               FontSize="12" Opacity="0.65"
+                               IsVisible="{Binding Subject,
+                                 Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+                    <TextBlock Text="{Binding GradingLabel}"
+                               FontSize="11" Opacity="0.4"/>
+                  </StackPanel>
+                </Grid>
+              </DataTemplate>
+            </ListBox.ItemTemplate>
+          </ListBox>
+        </DockPanel>
+      </Border>
+
+      <!-- Detail rechts – Platzhalter bis Gruppe gewählt -->
+      <Border Grid.Column="1">
+        <StackPanel HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    Spacing="8"
+                    IsVisible="{Binding !SelectedGroup}">
+          <TextBlock Text="Keine Gruppe ausgewählt"
+                     FontSize="16" Opacity="0.4"
+                     HorizontalAlignment="Center"/>
+          <TextBlock Text="Wähle eine Gruppe aus der Liste oder lege eine neue an."
+                     FontSize="12" Opacity="0.3"
+                     HorizontalAlignment="Center"/>
+        </StackPanel>
+      </Border>
+
+    </Grid>
+  </Grid>
+
+</UserControl>