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

<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.PlanningTabView"
             x:DataType="vm:PlanningTabViewModel">

  <Grid RowDefinitions="Auto,2*,Auto,Auto,2*" Margin="16">

    <!-- Einheiten-Toolbar -->
    <Grid Grid.Row="0" ColumnDefinitions="*,Auto" Margin="0,0,0,8">
      <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
        <TextBlock Text="Unterrichtseinheiten" FontSize="14" FontWeight="SemiBold"
                   VerticalAlignment="Center"/>
        <Button Content="↕ JSON" FontSize="11" Padding="7,3"
                ToolTip.Tip="Einheiten und Stunden importieren, exportieren oder die Formatbeschreibung kopieren">
          <Button.Flyout>
            <MenuFlyout Placement="BottomEdgeAlignedLeft">
              <MenuItem Header="Einheit mit Stunden exportieren…" Click="OnExportUnit"
                        IsEnabled="{Binding HasUnitSelection}"/>
              <MenuItem Header="Neue Einheit importieren…" Click="OnImportUnit"
                        IsEnabled="{Binding CanImportUnitPlanning}"/>
              <MenuItem Header="Formatbeschreibung Einheit kopieren" Click="OnCopyUnitFormat"/>
              <Separator/>
              <MenuItem Header="Ausgewählte Stunde exportieren…" Click="OnExportLesson"
                        IsEnabled="{Binding HasLessonSelection}"/>
              <MenuItem Header="Neue Stunde importieren…" Click="OnImportLesson"
                        IsEnabled="{Binding CanImportLessonPlanning}"/>
              <MenuItem Header="Formatbeschreibung Stunde kopieren" Click="OnCopyLessonFormat"/>
            </MenuFlyout>
          </Button.Flyout>
        </Button>
      </StackPanel>
      <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
        <Button Content="＋ Einheit"          Command="{Binding AddUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Bearbeiten"          Command="{Binding EditUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Als Vorlage kopieren" Command="{Binding CopyUnitCommand}"/>
        <Button Content="Löschen"             Command="{Binding DeleteUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="🤖 KI-Unterstützung" Command="{Binding AiAssistCommand}"/>
      </StackPanel>
    </Grid>

    <!-- Einheiten-Tabelle -->
    <DataGrid Grid.Row="1" ItemsSource="{Binding Units}"
              SelectedItem="{Binding SelectedUnit}"
              AutoGenerateColumns="False"
              IsReadOnly="True"
              GridLinesVisibility="Horizontal"
              CanUserReorderColumns="False"
              Margin="0,0,0,8">
      <DataGrid.Columns>
        <DataGridTextColumn Header="Titel"    Binding="{Binding Title}"            Width="*"/>
        <DataGridTextColumn Header="Zeitraum" Binding="{Binding DateRangeDisplay}" Width="200"/>
        <DataGridTemplateColumn Header="Status" Width="130">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate x:DataType="vm:UnitSummary">
              <Border Background="{Binding StatusColorHex}" CornerRadius="4"
                      Padding="8,2" HorizontalAlignment="Left">
                <TextBlock Text="{Binding StatusLabel}" FontSize="12" Foreground="White"/>
              </Border>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Fortschritt" Width="180">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate x:DataType="vm:UnitSummary">
              <StackPanel Spacing="2" VerticalAlignment="Center" Margin="0,4">
                <ProgressBar Value="{Binding ProgressFraction}" Maximum="1" Height="6"/>
                <TextBlock Text="{Binding ProgressText}" FontSize="11" Opacity="0.7"/>
              </StackPanel>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Kompetenzen" Binding="{Binding CompetencyCountLabel}" Width="120"/>
      </DataGrid.Columns>
    </DataGrid>

    <Separator Grid.Row="2" Margin="0,0,0,8"/>

    <!-- Stunden-Toolbar -->
    <Grid Grid.Row="3" ColumnDefinitions="*,Auto" Margin="0,0,0,8">
      <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center">
        <TextBlock Text="Stunden" FontSize="14" FontWeight="SemiBold"/>
        <TextBlock Text="{Binding SelectedUnitTitleSuffix}" FontSize="14" FontWeight="SemiBold"/>
      </StackPanel>
      <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
        <Button Content="＋ Stunde"              Command="{Binding AddLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Serie erzeugen"         Command="{Binding GenerateLessonSeriesCommand}"
                IsEnabled="{Binding !IsReadOnly}"
                ToolTip.Tip="Stunden für alle Termine aus dem Stundenplan im gewählten Zeitraum anlegen."/>
        <Button Content="Anzeigen"               Command="{Binding ShowLessonCommand}"
                ToolTip.Tip="Verlaufsplan schreibgeschützt und größer anzeigen — zum Mitnehmen in den Unterricht."/>
        <Button Content="Bearbeiten"             Command="{Binding EditLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Verschieben"            Command="{Binding MoveLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Status → Durchgeführt"  Command="{Binding AdvanceLessonStatusCommand}" IsEnabled="{Binding !IsReadOnly}"/>
        <Button Content="Sitzung erzeugen"       Command="{Binding CreateParticipationSessionCommand}"
                IsEnabled="{Binding !IsReadOnly}"
                ToolTip.Tip="Legt eine Mitarbeitssitzung mit Datum und Thema dieser Stunde an."/>
        <Button Content="Löschen"                Command="{Binding DeleteLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
      </StackPanel>
    </Grid>

    <!-- Stunden-Tabelle -->
    <DataGrid Grid.Row="4" ItemsSource="{Binding Lessons}"
              SelectedItem="{Binding SelectedLesson}"
              AutoGenerateColumns="False"
              IsReadOnly="True"
              GridLinesVisibility="Horizontal"
              CanUserReorderColumns="False">
      <DataGrid.Columns>
        <DataGridTextColumn Header="Datum"  Binding="{Binding DateDisplay}"   Width="100"/>
        <DataGridTextColumn Header="Nr."    Binding="{Binding LessonNumber}"  Width="50"/>
        <DataGridTextColumn Header="Thema"  Binding="{Binding Topic}"         Width="*"/>
        <DataGridTextColumn Header="Beginn" Binding="{Binding StartTimeDisplay}" Width="70"/>
        <DataGridTemplateColumn Header="Status" Width="130">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate x:DataType="vm:LessonSummary">
              <Border Background="{Binding StatusColorHex}" CornerRadius="4"
                      Padding="8,2" HorizontalAlignment="Left">
                <TextBlock Text="{Binding StatusLabel}" FontSize="12" Foreground="White"/>
              </Border>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Phasen"      Binding="{Binding PhaseCountLabel}"    Width="80"/>
        <DataGridTextColumn Header="Dauer"       Binding="{Binding TotalDurationLabel}" Width="80"/>
        <DataGridTextColumn Header="Materialien" Binding="{Binding MaterialsDisplay}"   Width="150"/>
        <DataGridTemplateColumn Header="HA" Width="40">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate x:DataType="vm:LessonSummary">
              <TextBlock Text="✓" IsVisible="{Binding HasHomework}" HorizontalAlignment="Center"/>
            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
      </DataGrid.Columns>
    </DataGrid>
  </Grid>
</UserControl>