Sidebar-Kompaktmodus polieren, Dashboard-Kalender ergänzen

- MainWindow: App-Titel durch ein kompaktes Logo-Badge ersetzt; im
  minimierten Zustand der Sidebar werden Nav-Icons automatisch größer
  und zentriert, Beschriftungen sowie Abschnittsüberschriften blenden
  aus (Classes-Binding auf DrawerPage.IsOpen).
- LearningGroup.IsOwnClass: neues Feld, per Checkbox im Gruppen-Dialog
  editierbar ("Gehört zu meiner Klasse"), mehrere Gruppen markierbar.
- Dashboard: kleiner Monatskalender mit Monatsnavigation, dezenter
  Einfärbung für Unterrichtstage, Klausur-Marker und Rahmen-Hervor-
  hebung für Tage der eigenen Klasse, inkl. Tooltip und Legende.
  Feste Kartenposition/-breite, damit weder Monatsnamenlänge noch die
  wachsende Lerngruppen-Liste das Layout verschieben.
- TODO.md: geplante Kalender-Detailansicht (Tag auswählen → Termine
  des Tages mit Sprung in die jeweilige Ansicht) unter 9.8 vermerkt.

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

LehrerApp.Core/Models/LearningGroup.cs

@@ -12,6 +12,7 @@ public class LearningGroup
     public GradingSystem GradingSystem { get; set; }
     public int? HoursPerWeek { get; set; }
     public bool IsActive { get; set; } = true;
+    public bool IsOwnClass { get; set; }
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 }

LehrerApp.Desktop/ViewModels/DashboardViewModel.cs

@@ -10,34 +10,44 @@ namespace LehrerApp.Desktop.ViewModels;
 
 public partial class DashboardViewModel : ObservableObject
 {
+    private static readonly CultureInfo De = new("de-DE");
+
     private readonly IGroupRepository _groups;
     private readonly ILessonRepository _lessons;
+    private readonly IExamRepository _exams;
     private readonly IWorkTaskRepository _tasks;
     private readonly SchoolYearService _sy;
 
     [ObservableProperty] private string _greeting = "";
     [ObservableProperty] private string _currentDate = "";
     [ObservableProperty] private string _currentSchoolYear = "";
+    [ObservableProperty] private DateOnly _calendarMonth = FirstOfMonth(DateTime.Today);
+
+    public string CalendarMonthLabel => CalendarMonth.ToString("MMMM yyyy", De);
 
     public ObservableCollection<LessonItem> TodaysLessons { get; } = [];
     public ObservableCollection<TaskItem> OpenTasks { get; } = [];
     public ObservableCollection<GroupChip> CurrentGroups { get; } = [];
+    public ObservableCollection<CalendarDayCell> CalendarDays { get; } = [];
+    public static string[] CalendarWeekdayHeaders { get; } = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"];
 
     // Navigation-Callback – wird von App.axaml.cs verdrahtet
     public Action<Guid>? OnNavigateToGroup { get; set; }
 
     public DashboardViewModel(IGroupRepository groups, ILessonRepository lessons,
-        IWorkTaskRepository tasks, SchoolYearService sy)
+        IExamRepository exams, IWorkTaskRepository tasks, SchoolYearService sy)
     {
-        _groups = groups; _lessons = lessons; _tasks = tasks; _sy = sy;
+        _groups = groups; _lessons = lessons; _exams = exams; _tasks = tasks; _sy = sy;
         Load();
     }
 
+    private static DateOnly FirstOfMonth(DateTime d) => new(d.Year, d.Month, 1);
+
     private void Load()
     {
         var now   = DateTime.Now;
         var today = DateOnly.FromDateTime(now);
-        CurrentDate        = now.ToString("dddd, d. MMMM yyyy", new CultureInfo("de-DE"));
+        CurrentDate        = now.ToString("dddd, d. MMMM yyyy", De);
         CurrentSchoolYear  = _sy.CurrentSchoolYear();
         Greeting = now.Hour < 12 ? "Guten Morgen" : now.Hour < 18 ? "Guten Tag" : "Guten Abend";
 
@@ -61,12 +71,120 @@ public partial class DashboardViewModel : ObservableObject
         CurrentGroups.Clear();
         foreach (var g in groups.Values.OrderBy(g => g.Name))
             CurrentGroups.Add(new() { GroupId = g.Id, Name = g.Name, Subject = g.Subject ?? "" });
+
+        CalendarMonth = FirstOfMonth(now);
+        LoadCalendar();
+    }
+
+    private void LoadCalendar()
+    {
+        CalendarDays.Clear();
+        var today = DateOnly.FromDateTime(DateTime.Today);
+
+        // Rasterstart: Montag der Woche, die den 1. des Monats enthält – 6 Wochen (42 Tage) Raster.
+        var firstOfMonth = CalendarMonth;
+        var mondayOffset = ((int)firstOfMonth.DayOfWeek + 6) % 7; // Montag=0 ... Sonntag=6
+        var gridStart    = firstOfMonth.AddDays(-mondayOffset);
+        var gridEnd      = gridStart.AddDays(41);
+
+        var groups = _groups.GetBySchoolYear(_sy.CurrentSchoolYear());
+        var byDay  = new Dictionary<DateOnly, DayAgg>();
+
+        DayAgg Agg(DateOnly d)
+        {
+            if (!byDay.TryGetValue(d, out var agg)) byDay[d] = agg = new DayAgg();
+            return agg;
+        }
+
+        foreach (var g in groups)
+        {
+            foreach (var lesson in _lessons.GetByGroupAndRange(g.Id, gridStart, gridEnd))
+            {
+                var agg = Agg(lesson.Date);
+                agg.HasLesson = true;
+                if (g.IsOwnClass) agg.IsOwnClassDay = true;
+                agg.Details.Add($"Unterricht: {g.Name}" +
+                    (string.IsNullOrWhiteSpace(lesson.Topic) ? "" : $" – {lesson.Topic}"));
+            }
+
+            foreach (var exam in _exams.GetByGroup(g.Id).Where(e => e.Date >= gridStart && e.Date <= gridEnd))
+            {
+                var agg = Agg(exam.Date);
+                agg.HasExam = true;
+                if (g.IsOwnClass) agg.IsOwnClassDay = true;
+                agg.Details.Add($"Klausur: {exam.Title} ({g.Name})");
+            }
+        }
+
+        for (var i = 0; i < 42; i++)
+        {
+            var date = gridStart.AddDays(i);
+            byDay.TryGetValue(date, out var agg);
+            CalendarDays.Add(new CalendarDayCell(date, date.Month == firstOfMonth.Month, date == today,
+                agg?.HasLesson ?? false, agg?.HasExam ?? false, agg?.IsOwnClassDay ?? false,
+                agg?.Details ?? []));
+        }
+    }
+
+    [RelayCommand]
+    private void PrevMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(-1);
+        OnPropertyChanged(nameof(CalendarMonthLabel));
+        LoadCalendar();
+    }
+
+    [RelayCommand]
+    private void NextMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(1);
+        OnPropertyChanged(nameof(CalendarMonthLabel));
+        LoadCalendar();
+    }
+
+    [RelayCommand]
+    private void CalendarToday()
+    {
+        CalendarMonth = FirstOfMonth(DateTime.Today);
+        OnPropertyChanged(nameof(CalendarMonthLabel));
+        LoadCalendar();
     }
 
     [RelayCommand] private void OpenGroup(GroupChip? c) { if (c is not null) OnNavigateToGroup?.Invoke(c.GroupId); }
     [RelayCommand] private void Refresh() => Load();
+
+    private class DayAgg
+    {
+        public bool HasLesson;
+        public bool HasExam;
+        public bool IsOwnClassDay;
+        public List<string> Details { get; } = [];
+    }
 }
 
 public class LessonItem { public string GroupName { get; set; } = ""; public string Topic { get; set; } = ""; }
 public class TaskItem   { public string Title { get; set; } = ""; public string DueDate { get; set; } = ""; public bool IsOverdue { get; set; } }
 public class GroupChip  { public Guid GroupId { get; set; } public string Name { get; set; } = ""; public string Subject { get; set; } = ""; }
+
+public class CalendarDayCell
+{
+    public int DayNumber { get; }
+    public bool IsCurrentMonth { get; }
+    public bool IsToday { get; }
+    public bool HasLesson { get; }
+    public bool HasExam { get; }
+    public bool IsOwnClassDay { get; }
+    public string Tooltip { get; }
+
+    internal CalendarDayCell(DateOnly date, bool isCurrentMonth, bool isToday,
+        bool hasLesson, bool hasExam, bool isOwnClassDay, List<string> details)
+    {
+        DayNumber      = date.Day;
+        IsCurrentMonth = isCurrentMonth;
+        IsToday        = isToday;
+        HasLesson      = hasLesson;
+        HasExam        = hasExam;
+        IsOwnClassDay  = isOwnClassDay;
+        Tooltip        = details.Count == 0 ? date.ToString("dd.MM.yyyy") : string.Join("\n", details);
+    }
+}

LehrerApp.Desktop/ViewModels/Groups/GroupViewModels.cs

@@ -529,6 +529,7 @@ public partial class AddGroupDialogViewModel : ObservableObject
     [ObservableProperty] private string _selectedGradingName = "Noten 1–6";
     [ObservableProperty] private string _selectedSchoolYear = "";
     [ObservableProperty] private int? _hoursPerWeek;
+    [ObservableProperty] private bool _isOwnClass;
     [ObservableProperty] private string _validationMessage = "";
 
     public List<string> SchoolYears { get; }
@@ -565,6 +566,7 @@ public partial class AddGroupDialogViewModel : ObservableObject
             ? "Noten 1–6" : "Punkte 0–15";
         SelectedSchoolYear = group.SchoolYear;
         HoursPerWeek = group.HoursPerWeek;
+        IsOwnClass = group.IsOwnClass;
         OnPropertyChanged(nameof(DialogTitle));
         OnPropertyChanged(nameof(SaveButtonText));
     }
@@ -604,6 +606,7 @@ public partial class AddGroupDialogViewModel : ObservableObject
             ? GradingSystem.Points0To15 : GradingSystem.Grades1To6;
         Result.SchoolYear    = SelectedSchoolYear;
         Result.HoursPerWeek  = HoursPerWeek;
+        Result.IsOwnClass    = IsOwnClass;
         _groups.Save(Result);
 
         if (_editingGroup is not null && _originalSchoolYear != SelectedSchoolYear)

LehrerApp.Desktop/Views/Dashboard/DashboardView.axaml

@@ -13,7 +13,7 @@
         <TextBlock Text="{Binding CurrentDate}" FontSize="24" FontWeight="SemiBold"/>
       </StackPanel>
 
-      <Grid ColumnDefinitions="*,*" RowDefinitions="Auto,Auto">
+      <Grid ColumnDefinitions="*,*" RowDefinitions="Auto,Auto,Auto">
 
         <!-- Heutige Stunden -->
         <Border Grid.Column="0" Grid.Row="0" Margin="0,0,8,8"
@@ -67,8 +67,108 @@
           </StackPanel>
         </Border>
 
-        <!-- Meine Lerngruppen -->
+        <!-- Kalender: feste Position direkt unter Heute/Aufgaben, damit die wachsende
-        <Border Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2"
+             Lerngruppen-Liste darunter ihn nicht nach unten verdrängt. -->
+        <Border Grid.Column="0" Grid.Row="1" Margin="0,0,8,8" HorizontalAlignment="Left"
+                Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
+                CornerRadius="8" Padding="16">
+          <StackPanel Spacing="8">
+            <StackPanel.Styles>
+              <!-- Basiswerte als Style (nicht lokal), damit die spezifischeren Selektoren
+                   (z.B. .daycell.ownclass) sie überschreiben können. -->
+              <Style Selector="Border.daycell">
+                <Setter Property="Background" Value="Transparent"/>
+                <Setter Property="BorderThickness" Value="0"/>
+                <Setter Property="BorderBrush" Value="Transparent"/>
+                <Setter Property="Opacity" Value="1"/>
+              </Style>
+              <Style Selector="Border.daycell.haslesson">
+                <Setter Property="Background" Value="#14808080"/>
+              </Style>
+              <Style Selector="Border.daycell.ownclass">
+                <Setter Property="BorderThickness" Value="2"/>
+                <Setter Property="BorderBrush" Value="{DynamicResource SystemControlBackgroundAccentBrush}"/>
+              </Style>
+              <Style Selector="Border.daycell.outside">
+                <Setter Property="Opacity" Value="0.35"/>
+              </Style>
+              <Style Selector="TextBlock.daynum">
+                <Setter Property="FontWeight" Value="Normal"/>
+              </Style>
+              <Style Selector="TextBlock.daynum.today">
+                <Setter Property="FontWeight" Value="Bold"/>
+                <Setter Property="Foreground" Value="{DynamicResource SystemControlForegroundAccentBrush}"/>
+              </Style>
+            </StackPanel.Styles>
+
+            <Grid ColumnDefinitions="Auto,*,Auto,Auto,Auto">
+              <TextBlock Grid.Column="0" Text="KALENDER" FontSize="11" FontWeight="Bold"
+                         Opacity="0.5" VerticalAlignment="Center"/>
+              <TextBlock Grid.Column="1" Text="{Binding CalendarMonthLabel}" FontSize="13"
+                         FontWeight="SemiBold" TextAlignment="Center" VerticalAlignment="Center"
+                         Width="130" Margin="12,0"/>
+              <Button Grid.Column="2" Content="Heute" FontSize="11" Padding="8,2"
+                      Command="{Binding CalendarTodayCommand}" Margin="0,0,4,0"/>
+              <Button Grid.Column="3" Content="‹" Padding="8,2" Command="{Binding PrevMonthCommand}"/>
+              <Button Grid.Column="4" Content="›" Padding="8,2" Command="{Binding NextMonthCommand}" Margin="4,0,0,0"/>
+            </Grid>
+
+            <ItemsControl ItemsSource="{Binding CalendarWeekdayHeaders}">
+              <ItemsControl.ItemsPanel>
+                <ItemsPanelTemplate><UniformGrid Columns="7"/></ItemsPanelTemplate>
+              </ItemsControl.ItemsPanel>
+              <ItemsControl.ItemTemplate>
+                <DataTemplate>
+                  <TextBlock Text="{Binding}" FontSize="10" Opacity="0.5" FontWeight="Bold"
+                             HorizontalAlignment="Center" Width="32"/>
+                </DataTemplate>
+              </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+            <ItemsControl ItemsSource="{Binding CalendarDays}">
+              <ItemsControl.ItemsPanel>
+                <ItemsPanelTemplate><UniformGrid Columns="7"/></ItemsPanelTemplate>
+              </ItemsControl.ItemsPanel>
+              <ItemsControl.ItemTemplate>
+                <DataTemplate x:DataType="vm:CalendarDayCell">
+                  <Border Classes="daycell" Classes.ownclass="{Binding IsOwnClassDay}"
+                          Classes.haslesson="{Binding HasLesson}"
+                          Classes.outside="{Binding !IsCurrentMonth}"
+                          Width="32" Height="32" Margin="1" CornerRadius="6"
+                          ToolTip.Tip="{Binding Tooltip}">
+                    <Grid>
+                      <TextBlock Classes="daynum" Classes.today="{Binding IsToday}"
+                                 Text="{Binding DayNumber}" FontSize="12"
+                                 HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                      <Ellipse Width="5" Height="5" Fill="#E53935" Margin="0,0,0,3"
+                               HorizontalAlignment="Center" VerticalAlignment="Bottom"
+                               IsVisible="{Binding HasExam}"/>
+                    </Grid>
+                  </Border>
+                </DataTemplate>
+              </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+            <StackPanel Orientation="Horizontal" Spacing="14" Margin="0,4,0,0">
+              <StackPanel Orientation="Horizontal" Spacing="4">
+                <Border Width="10" Height="10" CornerRadius="3" Background="#14808080"/>
+                <TextBlock Text="Unterricht" FontSize="10" Opacity="0.6"/>
+              </StackPanel>
+              <StackPanel Orientation="Horizontal" Spacing="4">
+                <Ellipse Width="7" Height="7" Fill="#E53935"/>
+                <TextBlock Text="Klausur" FontSize="10" Opacity="0.6"/>
+              </StackPanel>
+              <StackPanel Orientation="Horizontal" Spacing="4">
+                <Border Width="10" Height="10" CornerRadius="3" BorderThickness="2"
+                        BorderBrush="{DynamicResource SystemControlBackgroundAccentBrush}"/>
+                <TextBlock Text="Meine Klasse" FontSize="10" Opacity="0.6"/>
+              </StackPanel>
+            </StackPanel>
+          </StackPanel>
+        </Border>
+
+        <!-- Meine Lerngruppen: wächst mit der Zeit, deshalb ganz unten und volle Breite -->
+        <Border Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="2"
                 Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
                 CornerRadius="8" Padding="16">
           <StackPanel>

LehrerApp.Desktop/Views/Groups/AddGroupDialog.axaml

@@ -64,6 +64,9 @@
         </StackPanel>
       </Grid>
 
+      <CheckBox Content="Gehört zu meiner Klasse" IsChecked="{Binding IsOwnClass}"
+                ToolTip.Tip="Für die farbliche Hervorhebung im Dashboard-Kalender. Mehrere Gruppen (Klasse + zugehörige Kurse) können markiert werden."/>
+
       <TextBlock Text="{Binding ValidationMessage}" Foreground="Red" FontSize="12"
                  IsVisible="{Binding ValidationMessage, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
     </StackPanel>

LehrerApp.Desktop/Views/MainWindow.axaml

@@ -21,10 +21,10 @@
     darunter als Overlay-Drawer mit Hamburger-Button (automatisch).
     Kein eigener Code nötig.
   -->
-  <DrawerPage DrawerLength="220"
+  <DrawerPage x:Name="RootDrawer"
+              DrawerLength="220"
               DrawerBehavior="Auto"
               DrawerLayoutBehavior="CompactInline"
-              
               Content="{Binding CurrentPage}">
 
     <DrawerPage.DataTemplates>
@@ -52,15 +52,48 @@
     </DrawerPage.DataTemplates>
 
     <DrawerPage.Drawer>
-      <DockPanel>
+      <DockPanel Classes.compact="{Binding !#RootDrawer.IsOpen}">
+        <DockPanel.Styles>
+          <!-- Basisgröße der Icons als Style (nicht lokal), damit der Compact-Selector sie
+               überschreiben kann – lokale Werte hätten immer Vorrang vor Style-Settern. -->
+          <Style Selector="TextBlock.navicon">
+            <Setter Property="FontSize" Value="15"/>
+          </Style>
+          <!-- Minimierter Zustand: Icons größer & zentriert, Beschriftungen ausgeblendet -->
+          <Style Selector="DockPanel.compact TextBlock.navlabel">
+            <Setter Property="IsVisible" Value="False"/>
+          </Style>
+          <Style Selector="DockPanel.compact TextBlock.navicon">
+            <Setter Property="FontSize" Value="20"/>
+          </Style>
+          <Style Selector="DockPanel.compact Button.navitem">
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+          </Style>
+          <Style Selector="DockPanel.compact TextBlock.navsection">
+            <Setter Property="IsVisible" Value="False"/>
+          </Style>
+          <Style Selector="DockPanel.compact TextBlock.appsubtitle">
+            <Setter Property="IsVisible" Value="False"/>
+          </Style>
+          <Style Selector="DockPanel.compact Border.appheader">
+            <Setter Property="HorizontalAlignment" Value="Center"/>
+          </Style>
+        </DockPanel.Styles>
 
         <Border DockPanel.Dock="Top" Padding="16,20,16,14"
                 BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
                 BorderThickness="0,0,0,1">
-          <StackPanel>
+          <StackPanel Orientation="Horizontal" Spacing="10">
-            <TextBlock Text="LehrerApp" FontSize="20" FontWeight="SemiBold"/>
+            <Border Classes="appheader" Width="32" Height="32" CornerRadius="8"
-            <TextBlock Text="{Binding CurrentSchoolYear}"
+                    Background="{DynamicResource SystemControlBackgroundAccentBrush}">
-                       FontSize="12" Opacity="0.55" Margin="0,2,0,0"/>
+              <TextBlock Text="L" FontSize="16" FontWeight="Bold" Foreground="White"
+                         HorizontalAlignment="Center" VerticalAlignment="Center"/>
+            </Border>
+            <StackPanel Classes="appsubtitle" VerticalAlignment="Center">
+              <TextBlock Text="LehrerApp" FontSize="15" FontWeight="SemiBold"/>
+              <TextBlock Text="{Binding CurrentSchoolYear}"
+                         FontSize="11" Opacity="0.55"/>
+            </StackPanel>
           </StackPanel>
         </Border>
 
@@ -72,49 +105,84 @@
 
         <ScrollViewer>
           <StackPanel Margin="8,12,8,0" Spacing="2">
-            <Button Content="📊  Dashboard" HorizontalAlignment="Stretch"
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Dashboard}"/>
+                    CommandParameter="{x:Static vm:NavItem.Dashboard}">
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="📊" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Dashboard"/>
+              </StackPanel>
+            </Button>
 
-            <TextBlock Text="UNTERRICHT" FontSize="10" FontWeight="Bold"
+            <TextBlock Classes="navsection" Text="UNTERRICHT" FontSize="10" FontWeight="Bold"
                        Opacity="0.4" Margin="10,14,0,4"/>
 
-            <Button Content="🏫  Lerngruppen" HorizontalAlignment="Stretch"
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Groups}"/>
+                    CommandParameter="{x:Static vm:NavItem.Groups}">
-            <Button Content="👤  Schüler" HorizontalAlignment="Stretch"
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="🏫" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Lerngruppen"/>
+              </StackPanel>
+            </Button>
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Students}"/>
+                    CommandParameter="{x:Static vm:NavItem.Students}">
-            <Button Content="📝  Klausuren" HorizontalAlignment="Stretch"
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="👤" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Schüler"/>
+              </StackPanel>
+            </Button>
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Exams}"/>
+                    CommandParameter="{x:Static vm:NavItem.Exams}">
-            <Button Content="📅  Planung" HorizontalAlignment="Stretch"
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="📝" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Klausuren"/>
+              </StackPanel>
+            </Button>
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Planner}"/>
+                    CommandParameter="{x:Static vm:NavItem.Planner}">
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="📅" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Planung"/>
+              </StackPanel>
+            </Button>
 
-            <TextBlock Text="VERWALTUNG" FontSize="10" FontWeight="Bold"
+            <TextBlock Classes="navsection" Text="VERWALTUNG" FontSize="10" FontWeight="Bold"
                        Opacity="0.4" Margin="10,14,0,4"/>
 
-            <Button Content="⏱  Arbeitszeit" HorizontalAlignment="Stretch"
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Workload}"/>
+                    CommandParameter="{x:Static vm:NavItem.Workload}">
-            <Button Content="⚙️  Einstellungen" HorizontalAlignment="Stretch"
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="⏱" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Arbeitszeit"/>
+              </StackPanel>
+            </Button>
+            <Button Classes="navitem" HorizontalAlignment="Stretch"
                     HorizontalContentAlignment="Left" Background="Transparent"
                     Padding="10,8" CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Settings}"/>
+                    CommandParameter="{x:Static vm:NavItem.Settings}">
+              <StackPanel Orientation="Horizontal" Spacing="10">
+                <TextBlock Classes="navicon" Text="⚙️" Width="20" TextAlignment="Center"/>
+                <TextBlock Classes="navlabel" Text="Einstellungen"/>
+              </StackPanel>
+            </Button>
           </StackPanel>
         </ScrollViewer>
       </DockPanel>

TODO.md

@@ -297,6 +297,8 @@ Format dokumentiert in [Kompetenzkatalog-KI-Prompt.md](docs/Kompetenzkatalog-KI-
 ## 9. Dashboard
 
 Basis vorhanden in [DashboardViewModel.cs](LehrerApp.Desktop/ViewModels/DashboardViewModel.cs).
+Kleiner Monatskalender ist bereits umgesetzt (Farbcodierung Unterricht/Klausur,
+Hervorhebung "eigene Klasse" über `LearningGroup.IsOwnClass`, feste Kartenbreite/-position).
 
 - [ ] **9.1** Heutige Stunden mit Uhrzeit und Raum anzeigen (Abhängigkeit zu 4.3).
 - [ ] **9.2** Direkter Absprung von einer Stunde in Mitarbeitserfassung bzw. Stundenplanung.
@@ -305,6 +307,11 @@ Basis vorhanden in [DashboardViewModel.cs](LehrerApp.Desktop/ViewModels/Dashboar
 - [ ] **9.5** Kachel "Auffälligkeiten": Fehlzeitenüberschreitungen, Notenabfall, Versetzungsgefährdung.
 - [ ] **9.6** Dashboard-Kacheln ein-/ausblendbar und in der Reihenfolge konfigurierbar.
 - [ ] **9.7** Automatische Aktualisierung beim Zurücknavigieren (aktuell nur manueller Refresh).
+- [ ] **9.8** Kalender-Detailansicht: Tag im Monatskalender anklickbar/auswählbar, zeigt in
+      einem angrenzenden Feld die Termine dieses Tages (Unterricht, Klausuren, perspektivisch
+      Konferenzen/Sondertermine) mit Details und Sprungmöglichkeit in die jeweilige Ansicht.
+      Sinnvoll erst, wenn weitere Terminarten existieren — Abhängigkeit zu Kapitel 4
+      (Unterrichtsplanung/Termine) sowie ggf. einem neuen Termine-Modell.
 
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