LehrerApp/LehrerApp.Desktop/Views/Workload/TimeTrackingView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Workload"
             xmlns:models="clr-namespace:LehrerApp.Core.Models;assembly=LehrerApp.Core"
             x:Class="LehrerApp.Desktop.Views.Workload.TimeTrackingView"
             x:DataType="vm:TimeTrackingViewModel">
  <ScrollViewer>
    <StackPanel Margin="20,16" Spacing="16">

      <!-- Timer (6.2.1) -->
      <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}" CornerRadius="8" Padding="16">
        <StackPanel Spacing="10">
          <TextBlock Text="Timer" FontWeight="SemiBold" FontSize="14"/>
          <Grid ColumnDefinitions="*,8,*" IsEnabled="{Binding !IsTimerRunning}">
            <StackPanel Grid.Column="0" Spacing="4">
              <TextBlock Text="Aufgabe (optional)" FontSize="12" Opacity="0.7"/>
              <ComboBox ItemsSource="{Binding OpenTasks}" SelectedItem="{Binding SelectedTimerTask}"
                        HorizontalAlignment="Stretch" PlaceholderText="Keine Aufgabe">
                <ComboBox.ItemTemplate>
                  <DataTemplate x:DataType="models:WorkTask">
                    <TextBlock Text="{Binding Title}"/>
                  </DataTemplate>
                </ComboBox.ItemTemplate>
              </ComboBox>
            </StackPanel>
            <StackPanel Grid.Column="2" Spacing="4">
              <TextBlock Text="Kategorie" FontSize="12" Opacity="0.7"/>
              <ComboBox ItemsSource="{Binding CategoryOptions}" SelectedItem="{Binding SelectedTimerCategory}"
                        HorizontalAlignment="Stretch"/>
            </StackPanel>
          </Grid>
          <Grid ColumnDefinitions="Auto,*">
            <Button Grid.Column="0" Content="▶ Start" Command="{Binding StartTimerCommand}"
                    IsVisible="{Binding !IsTimerRunning}"/>
            <Button Grid.Column="0" Content="■ Stop" Command="{Binding StopTimerCommand}"
                    IsVisible="{Binding IsTimerRunning}"/>
            <TextBlock Grid.Column="1" Text="{Binding RunningSinceDisplay}" VerticalAlignment="Center"
                       Margin="12,0,0,0" FontWeight="SemiBold"/>
          </Grid>
        </StackPanel>
      </Border>

      <!-- Wochenübersicht (6.2.3) -->
      <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}" CornerRadius="8" Padding="16">
        <StackPanel Spacing="10">
          <Grid ColumnDefinitions="*,Auto">
            <TextBlock Grid.Column="0" Text="Diese Woche" FontWeight="SemiBold" FontSize="14"/>
            <TextBlock Grid.Column="1" Text="{Binding TotalWeekMinutesDisplay}" Opacity="0.7" FontSize="12"/>
          </Grid>
          <ItemsControl ItemsSource="{Binding CategorySummaries}">
            <ItemsControl.ItemTemplate>
              <DataTemplate x:DataType="vm:CategoryWeekSummary">
                <Grid ColumnDefinitions="120,*,60" Margin="0,3">
                  <TextBlock Grid.Column="0" Text="{Binding Category}" FontSize="12" VerticalAlignment="Center"/>
                  <ProgressBar Grid.Column="1" Value="{Binding BarFraction}" Maximum="1" Height="8"
                               VerticalAlignment="Center" Margin="8,0"/>
                  <TextBlock Grid.Column="2" Text="{Binding MinutesDisplay}" FontSize="12"
                             HorizontalAlignment="Right" VerticalAlignment="Center"/>
                </Grid>
              </DataTemplate>
            </ItemsControl.ItemTemplate>
          </ItemsControl>
          <TextBlock Text="Noch keine Zeiten diese Woche erfasst." Opacity="0.6" FontSize="12"
                     IsVisible="{Binding !CategorySummaries.Count}"/>
        </StackPanel>
      </Border>

      <!-- Einträge / Nacherfassung (6.2.2) -->
      <Grid ColumnDefinitions="*,Auto">
        <TextBlock Grid.Column="0" Text="Einträge" FontWeight="SemiBold" FontSize="14" VerticalAlignment="Center"/>
        <Button Grid.Column="1" Content="＋ Nacherfassen" Command="{Binding AddEntryCommand}"/>
      </Grid>

      <ItemsControl ItemsSource="{Binding WeekEntries}">
        <ItemsControl.ItemTemplate>
          <DataTemplate x:DataType="vm:TimeEntryListItem">
            <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
                    CornerRadius="6" Padding="12,8" Margin="0,0,0,6">
              <Grid ColumnDefinitions="80,*,Auto,Auto">
                <TextBlock Grid.Column="0" Text="{Binding DateDisplay}" FontSize="12" Opacity="0.6"
                           VerticalAlignment="Center"/>
                <StackPanel Grid.Column="1" Margin="8,0" VerticalAlignment="Center">
                  <TextBlock Text="{Binding CategoryAndTaskDisplay}" FontSize="13"/>
                  <TextBlock Text="{Binding Description}" FontSize="11" Opacity="0.6"
                             IsVisible="{Binding Description, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
                </StackPanel>
                <TextBlock Grid.Column="2" Text="{Binding DurationDisplay}" VerticalAlignment="Center"
                           Margin="0,0,10,0" FontSize="12"/>
                <Button Grid.Column="3" Content="Löschen" FontSize="11" Padding="8,3"
                        Command="{Binding $parent[ItemsControl].((vm:TimeTrackingViewModel)DataContext).DeleteEntryCommand}"
                        CommandParameter="{Binding}"/>
              </Grid>
            </Border>
          </DataTemplate>
        </ItemsControl.ItemTemplate>
      </ItemsControl>
      <TextBlock Text="Noch keine Einträge diese Woche." Opacity="0.6" Margin="4,4"
                 IsVisible="{Binding !WeekEntries.Count}"/>
    </StackPanel>
  </ScrollViewer>
</UserControl>