UI Improvements: Planungsdialog, Fehlzeitendarstellung, Vorauswahl der Einheit

LehrerApp.Data/Repositories/AllRepositories.cs

@@ -357,6 +357,20 @@ public class UnitRepository(LiteDbContext db) : IUnitRepository
     public void Save(Unit u)
     {
         ArchivedGroupWriteGuard.EnsureActive(db, u.GroupId);
+        // Persistenz-Invariante: auch Importe und künftig hinzukommende Aufrufer dürfen keine
+        // zweite laufende Einheit in derselben Lerngruppe hinterlassen. Der Einheiten-Dialog
+        // kündigt diese automatische Ablösung vorher sichtbar an.
+        if (u.Status == UnitStatus.Active)
+        {
+            foreach (var previous in db.Units.Find(x => x.GroupId == u.GroupId &&
+                         x.Status == UnitStatus.Active && x.Id != u.Id))
+            {
+                previous.Status = UnitStatus.Completed;
+                previous.UpdatedAt = DateTime.UtcNow;
+                db.Units.Upsert(previous);
+                db.OnChange?.Invoke(nameof(Unit), previous.Id.ToString(), "Save", previous);
+            }
+        }
         u.UpdatedAt = DateTime.UtcNow;
         db.Units.Upsert(u);
         db.OnChange?.Invoke(nameof(Unit), u.Id.ToString(), "Save", u);

LehrerApp.Desktop.Tests/ClassTeacherViewModelsTests.cs

@@ -8,6 +8,37 @@ namespace LehrerApp.Desktop.Tests;
 
 public sealed class ClassTeacherViewModelsTests
 {
+    [Fact]
+    public void Monatskalender_KodiertFehlzeitenUndBlendetHausaufgabenStandardmaessigAus()
+    {
+        var month = new DateOnly(2026, 9, 1);
+        var absences = new[]
+        {
+            new ClassAbsenceDaySummaryRow(new DateOnly(2026, 9, 2), "Müller Ada", 1, 0, 12,
+                ["Deu"], [1], ["entsch."], ["Verspätung"], null, null, false),
+            new ClassAbsenceDaySummaryRow(new DateOnly(2026, 9, 3), "Schmidt Ben", 2, 2, 90,
+                ["Mathe"], [1, 2], ["nicht entsch."], ["Absent"], null, null, false),
+        };
+        var register = new[]
+        {
+            new ClassTeacherClassRegisterRow(new DateOnly(2026, 9, 3), "Deu", "Schmidt Ben", "test",
+                "Störung", "Negativ", "Unterricht massiv gestört"),
+            new ClassTeacherClassRegisterRow(new DateOnly(2026, 9, 4), "Mathe", "Müller Ada", "test",
+                "Hausaufgaben", "Negativ", "Hausaufgaben fehlen"),
+        };
+
+        var days = ClassTeacherDetailsViewModel.BuildCalendarDays(month, absences, register, includeHomework: false);
+
+        Assert.Equal(0, days.Count % 5);
+        Assert.Contains(days.SelectMany(d => d.Events), e => e.Code == "V");
+        Assert.Contains(days.SelectMany(d => d.Events), e => e.Code == "U");
+        Assert.Contains(days.SelectMany(d => d.Events), e => e.Code == "!");
+        Assert.DoesNotContain(days.SelectMany(d => d.Events), e => e.Code == "H");
+
+        var withHomework = ClassTeacherDetailsViewModel.BuildCalendarDays(month, absences, register, includeHomework: true);
+        Assert.Contains(withHomework.SelectMany(d => d.Events), e => e.Code == "H");
+    }
+
     [Fact]
     public void GroupByStudentAndDay_FasstFehlstundenProSchuelerUndTagZusammen()
     {

LehrerApp.Desktop.Tests/PlanningTabViewModelTests.cs

@@ -45,6 +45,21 @@ public class PlanningTabViewModelTests
         Assert.Contains("2 / 3", summary.ProgressText);
     }
 
+    [Fact]
+    public void Initialize_WaehltLaufendeEinheitAlsArbeitskontext()
+    {
+        var (vm, units, _, groupId) = BuildScenario();
+        units.Add(new Unit { GroupId = groupId, Title = "Früher", Status = UnitStatus.Completed,
+            StartDate = new DateOnly(2025, 8, 1) });
+        var active = new Unit { GroupId = groupId, Title = "Aktuell", Status = UnitStatus.Active,
+            StartDate = new DateOnly(2025, 9, 1) };
+        units.Add(active);
+
+        vm.Initialize(groupId);
+
+        Assert.Equal(active.Id, vm.SelectedUnit?.Id);
+    }
+
     [Fact]
     public async Task MoveLesson_MitNachrueckenVerschiebtNurGeplanteFolgestundenNachDemStichtag()
     {

LehrerApp.Desktop.Tests/UnitDialogViewModelTests.cs

@@ -25,4 +25,28 @@ public sealed class UnitDialogViewModelTests
 
         Assert.Equal("10c · kein Fach hinterlegt (siehe Lerngruppe)", vm.GroupSubjectDisplay);
     }
+
+    [Fact]
+    public void Laufend_SetztBisherigeLaufendeEinheitAufAbgeschlossenUndWarntVorher()
+    {
+        var groupId = Guid.NewGuid();
+        var units = new FakeUnits();
+        var previous = new LehrerApp.Core.Models.Unit
+        {
+            GroupId = groupId, Title = "Bruchrechnung", Status = LehrerApp.Core.Models.UnitStatus.Active,
+        };
+        units.Add(previous);
+        var vm = new UnitDialogViewModel(units, new FakeCompetencyDomains(),
+            groupId, null, 6, "6a", "Mathematik", editingUnit: null)
+        {
+            Title = "Prozentrechnung",
+            StatusName = "Laufend",
+        };
+
+        Assert.Contains("Bruchrechnung", vm.StatusNotice);
+        vm.SaveCommand.Execute(null);
+
+        Assert.Equal(LehrerApp.Core.Models.UnitStatus.Completed, previous.Status);
+        Assert.Single(units.GetByGroup(groupId), u => u.Status == LehrerApp.Core.Models.UnitStatus.Active);
+    }
 }

LehrerApp.Desktop/ViewModels/ClassTeacher/ClassTeacherDetailsViewModel.cs

@@ -119,6 +119,24 @@ public sealed record ClassAbsenceDaySummaryRow(DateOnly Date, string StudentName
         DateOnly.TryParseExact(value.ToString(), "yyyyMMdd", out date);
 }
 
+public enum ClassTeacherCalendarEventKind { Late, Absent, Unexcused, Excused, ClassRegister, Homework }
+
+/// <summary>Kompakter, farblich codierter Marker in der Klassenlehrer-Monatsansicht.</summary>
+public sealed record ClassTeacherCalendarEvent(string StudentName, string Code, string Label,
+    string ColorHex, ClassTeacherCalendarEventKind Kind)
+{
+    public string Tooltip => $"{StudentName}: {Label}";
+}
+
+/// <summary>Ein Werktag im 5-Spalten-Monatsraster; Tage außerhalb des Monats sind Platzhalter.</summary>
+public sealed record ClassTeacherCalendarDay(DateOnly? Date, IReadOnlyList<ClassTeacherCalendarEvent> Events)
+{
+    public bool IsPlaceholder => Date is null;
+    public string DayLabel => Date?.ToString("dd.") ?? "";
+    public string WeekdayLabel => Date?.ToString("ddd", System.Globalization.CultureInfo.GetCultureInfo("de-DE")) ?? "";
+    public bool HasEvents => Events.Count > 0;
+}
+
 /// <summary>
 /// Details-Ansicht des Klassenlehrer-Bereichs: Klassenbucheinträge, die andere Lehrkräfte zu
 /// Schülern der Klasse angelegt haben (WebUntis "-alle-"-Bericht, gefiltert auf fremde statt der
@@ -149,6 +167,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     public ObservableCollection<ClassAbsenceDaySummaryRow> AbsenceEntries { get; } = [];
     public ObservableCollection<ClassTeacherCategoryAggregateRow> CategoryAggregates { get; } = [];
     public ObservableCollection<DocumentationItem> OwnDocumentationEntries { get; } = [];
+    public ObservableCollection<ClassTeacherCalendarDay> CalendarDays { get; } = [];
 
     /// Für das Kontextmenü "→ An Vorgang anheften" (DataGrid.SelectedItem, zweigleisig gebunden).
     [ObservableProperty] private ClassTeacherClassRegisterRow? _selectedEntry;
@@ -160,6 +179,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     /// Von der Übersicht gesetzt (Klick auf eine Roster-Zeile) - leer zeigt alle Schüler*innen.
     [ObservableProperty] private string _studentFilter = "";
     [ObservableProperty] private int _quickRangeIndex = 1;
+    [ObservableProperty] private bool _showMonthlyCalendar;
+    [ObservableProperty] private bool _includeHomeworkInCalendar;
+    [ObservableProperty] private DateOnly _calendarMonth = new(DateTime.Today.Year, DateTime.Today.Month, 1);
     /// Umschalter Klassenbuch (WebUntis, andere Lehrkräfte) ↔ eigene Dokumentation.
     [ObservableProperty] private bool _showOwnDocumentation;
     [ObservableProperty] private int _ownDocumentationCount;
@@ -174,6 +196,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
 
     public bool HasEntries => Entries.Count > 0;
     public bool HasAbsenceEntries => AbsenceEntries.Count > 0;
+    public bool ShowAbsenceListEmpty => !ShowMonthlyCalendar && !HasAbsenceEntries;
     public bool HasCategoryAggregates => CategoryAggregates.Count > 0;
     public bool HasOwnDocumentationEntries => OwnDocumentationEntries.Count > 0;
     /// Die Kategorien-Chipreihe fasst nur WebUntis-Kategorien zusammen (<see cref="CategoryAggregates"/>)
@@ -182,6 +205,8 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     public int UntisCriticalCount => Entries.Count(e => e.IsDangerStatus);
     public string ActiveFilterLabel => string.IsNullOrWhiteSpace(StudentFilter)
         ? "Alle Schüler*innen" : StudentFilter;
+    public string CalendarMonthLabel => CalendarMonth.ToString("MMMM yyyy",
+        System.Globalization.CultureInfo.GetCultureInfo("de-DE"));
 
     public ClassTeacherDetailsViewModel(UntisReportCacheService cache, IDocumentationRepository documentation,
         IStudentRepository students, ClassTeacherCasesViewModel cases)
@@ -198,6 +223,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         StudentFilter = "";
         Entries.Clear();
         AbsenceEntries.Clear();
+        CalendarDays.Clear();
         CategoryAggregates.Clear();
         OwnDocumentationEntries.Clear();
         _rosterMatches = [];
@@ -208,6 +234,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     partial void OnStudentFilterChanged(string value) => OnPropertyChanged(nameof(ActiveFilterLabel));
 
     partial void OnShowOwnDocumentationChanged(bool value) => OnPropertyChanged(nameof(ShowCategoryAggregates));
+    partial void OnShowMonthlyCalendarChanged(bool value) => OnPropertyChanged(nameof(ShowAbsenceListEmpty));
+    partial void OnIncludeHomeworkInCalendarChanged(bool value) => BuildCalendar();
+    partial void OnCalendarMonthChanged(DateOnly value) => OnPropertyChanged(nameof(CalendarMonthLabel));
 
     partial void OnQuickRangeIndexChanged(int value)
     {
@@ -230,6 +259,37 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     [RelayCommand]
     private Task ApplyFilter() => LoadInternal(forceRefresh: false);
 
+    [RelayCommand] private void ShowAbsenceList() => ShowMonthlyCalendar = false;
+
+    [RelayCommand]
+    private async Task ShowCalendar()
+    {
+        ShowMonthlyCalendar = true;
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    [RelayCommand]
+    private async Task PreviousCalendarMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(-1);
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    [RelayCommand]
+    private async Task NextCalendarMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(1);
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    private Task LoadCalendarMonth(bool forceRefresh)
+    {
+        StartDate = new DateTimeOffset(CalendarMonth.ToDateTime(TimeOnly.MinValue));
+        var end = CalendarMonth.AddMonths(1).AddDays(-1);
+        EndDate = new DateTimeOffset(end.ToDateTime(TimeOnly.MinValue));
+        return LoadInternal(forceRefresh);
+    }
+
     [RelayCommand]
     private async Task ClearStudentFilter()
     {
@@ -270,6 +330,8 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
             foreach (var row in ClassAbsenceDaySummaryRow.GroupByStudentAndDay(absences))
                 AbsenceEntries.Add(row);
 
+            BuildCalendar();
+
             var localStudents = _students.GetAll();
             _rosterMatches = rosterTask.Result
                 .Select(r => (Roster: r, Student: ClassTeacherOverviewViewModel.MatchStudent(r.DisplayName, localStudents)))
@@ -289,6 +351,67 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         finally { Busy = false; NotifyListState(); }
     }
 
+    private void BuildCalendar()
+    {
+        CalendarDays.Clear();
+        foreach (var day in BuildCalendarDays(CalendarMonth, AbsenceEntries, Entries, IncludeHomeworkInCalendar))
+            CalendarDays.Add(day);
+    }
+
+    /// <summary>Baut ein Montag-bis-Freitag-Raster aus den ohnehin geladenen Berichten. Negative
+    /// Klassenbucheinträge erscheinen als !; Hausaufgaben sind eine bewusst optionale Sonderlage.</summary>
+    public static IReadOnlyList<ClassTeacherCalendarDay> BuildCalendarDays(DateOnly month,
+        IReadOnlyList<ClassAbsenceDaySummaryRow> absences,
+        IReadOnlyList<ClassTeacherClassRegisterRow> registerEntries, bool includeHomework)
+    {
+        var first = new DateOnly(month.Year, month.Month, 1);
+        var last = first.AddMonths(1).AddDays(-1);
+        var gridStart = first.AddDays(-(((int)first.DayOfWeek + 6) % 7));
+        var gridEnd = last.AddDays((7 - (int)last.DayOfWeek) % 7);
+        var result = new List<ClassTeacherCalendarDay>();
+
+        for (var date = gridStart; date <= gridEnd; date = date.AddDays(1))
+        {
+            if (date.DayOfWeek is DayOfWeek.Saturday or DayOfWeek.Sunday) continue;
+            if (date.Month != first.Month)
+            {
+                result.Add(new ClassTeacherCalendarDay(null, []));
+                continue;
+            }
+
+            var events = new List<ClassTeacherCalendarEvent>();
+            foreach (var absence in absences.Where(a => a.Date == date).OrderBy(a => a.StudentDisplayName))
+            {
+                var (code, label, color, kind) = absence.IsUnexcused
+                    ? ("U", "Unentschuldigt gefehlt", "#C62828", ClassTeacherCalendarEventKind.Unexcused)
+                    : absence.IsLate
+                        ? ("V", "Verspätet", "#EF6C00", ClassTeacherCalendarEventKind.Late)
+                        : absence.FriendlyStatusLabel.Contains("Entschuldigt", StringComparison.OrdinalIgnoreCase)
+                            ? ("E", "Entschuldigt gefehlt", "#2E7D32", ClassTeacherCalendarEventKind.Excused)
+                            : ("A", "Abwesend", "#1565C0", ClassTeacherCalendarEventKind.Absent);
+                events.Add(new ClassTeacherCalendarEvent(absence.StudentDisplayName, code, label, color, kind));
+            }
+
+            foreach (var entry in registerEntries.Where(e => e.Date == date).OrderBy(e => e.StudentDisplayName))
+            {
+                var isHomework = ContainsHomework(entry);
+                if (isHomework && !includeHomework) continue;
+                if (!entry.IsDangerStatus && !isHomework) continue;
+                events.Add(new ClassTeacherCalendarEvent(entry.StudentDisplayName,
+                    isHomework ? "H" : "!", isHomework ? "Hausaufgaben" : "Negativer Klassenbucheintrag",
+                    isHomework ? "#6A1B9A" : "#8E24AA",
+                    isHomework ? ClassTeacherCalendarEventKind.Homework : ClassTeacherCalendarEventKind.ClassRegister));
+            }
+
+            result.Add(new ClassTeacherCalendarDay(date, events));
+        }
+        return result;
+    }
+
+    private static bool ContainsHomework(ClassTeacherClassRegisterRow entry) =>
+        entry.CategoryName?.Contains("Hausauf", StringComparison.OrdinalIgnoreCase) == true ||
+        entry.Text?.Contains("Hausauf", StringComparison.OrdinalIgnoreCase) == true;
+
     /// Baut <see cref="OwnDocumentationEntries"/> aus <see cref="_rosterMatches"/> und dem zuletzt
     /// geladenen Zeitraum neu auf — separat von <see cref="LoadInternal"/>, damit Anlegen/Bearbeiten/
     /// Löschen eines eigenen Eintrags nicht auch die WebUntis-Berichte neu abruft. Die eigentliche
@@ -419,6 +542,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     {
         OnPropertyChanged(nameof(HasEntries));
         OnPropertyChanged(nameof(HasAbsenceEntries));
+        OnPropertyChanged(nameof(ShowAbsenceListEmpty));
         OnPropertyChanged(nameof(HasCategoryAggregates));
         OnPropertyChanged(nameof(ShowCategoryAggregates));
         OnPropertyChanged(nameof(HasOwnDocumentationEntries));

LehrerApp.Desktop/ViewModels/Groups/PlanningViewModels.cs

@@ -102,10 +102,10 @@ public partial class PlanningTabViewModel : ObservableObject
         GradeLevel = group?.GradeLevel ?? 0;
         SubjectName = SubjectId is Guid sid ? _subjects.GetById(sid)?.Name ?? "" : "";
         GroupLabel = group?.Name ?? "";
-        LoadUnits();
+        LoadUnits(preferActive: true);
     }
 
-    private void LoadUnits()
+    private void LoadUnits(bool preferActive = false)
     {
         var selectedId = SelectedUnit?.Id;
         Units.Clear();
@@ -128,7 +128,11 @@ public partial class PlanningTabViewModel : ObservableObject
         KnownMaterials  = materials.OrderBy(m => m, StringComparer.CurrentCultureIgnoreCase).ToList();
         KnownShorthands = shorthands.OrderBy(s => s, StringComparer.CurrentCultureIgnoreCase).ToList();
 
-        SelectedUnit = Units.FirstOrDefault(u => u.Id == selectedId) ?? Units.FirstOrDefault();
+        // Beim ersten Öffnen bzw. beim Wechsel aus dem Stundenplan steht die laufende Einheit im
+        // Fokus. Eine bewusste Auswahl innerhalb derselben Gruppe bleibt bei Refreshes erhalten.
+        SelectedUnit = !preferActive && selectedId is not null
+            ? Units.FirstOrDefault(u => u.Id == selectedId) ?? Units.FirstOrDefault(u => u.Status == UnitStatus.Active) ?? Units.FirstOrDefault()
+            : Units.FirstOrDefault(u => u.Status == UnitStatus.Active) ?? Units.FirstOrDefault();
     }
 
     partial void OnSelectedUnitChanged(UnitSummary? value)
@@ -574,6 +578,7 @@ public partial class UnitDialogViewModel : ObservableObject
     [ObservableProperty] private string _startDateText = "";
     [ObservableProperty] private string _endDateText = "";
     [ObservableProperty] private string _statusName = UnitStatusDisplay.Options[0];
+    [ObservableProperty] private string _statusNotice = "";
     [ObservableProperty] private string _notes = "";
     [ObservableProperty] private bool _isCompetencyPanelOpen;
     [ObservableProperty] private string _titleError = "";
@@ -594,6 +599,20 @@ public partial class UnitDialogViewModel : ObservableObject
     public string DialogTitle => _editingUnit is null ? "Neue Einheit anlegen" : "Einheit bearbeiten";
     public string SaveButtonText => _editingUnit is null ? "Anlegen" : "Speichern";
 
+    partial void OnStatusNameChanged(string value)
+    {
+        if (UnitStatusDisplay.FromName(value) != UnitStatus.Active)
+        {
+            StatusNotice = "";
+            return;
+        }
+
+        var previous = _units.GetByGroup(_groupId)
+            .FirstOrDefault(u => u.Status == UnitStatus.Active && u.Id != _editingUnit?.Id);
+        StatusNotice = previous is null ? ""
+            : $"„{previous.Title}“ wird beim Speichern automatisch abgeschlossen.";
+    }
+
     public UnitDialogViewModel(IUnitRepository units, ICompetencyDomainRepository competencyDomains,
         Guid groupId, Guid? subjectId, int gradeLevel, string groupName, string subjectName, Unit? editingUnit)
     {
@@ -679,6 +698,17 @@ public partial class UnitDialogViewModel : ObservableObject
         Result.Status = UnitStatusDisplay.FromName(StatusName);
         Result.Notes = string.IsNullOrWhiteSpace(Notes) ? null : Notes.Trim();
         Result.Competencies = _competencyCodes;
+        if (Result.Status == UnitStatus.Active)
+        {
+            // Pro Lerngruppe gibt es genau einen aktuellen Arbeitskontext. Frühere laufende
+            // Einheiten werden nicht verworfen, sondern fachlich sauber abgeschlossen.
+            foreach (var previous in _units.GetByGroup(_groupId)
+                         .Where(u => u.Status == UnitStatus.Active && u.Id != Result.Id))
+            {
+                previous.Status = UnitStatus.Completed;
+                _units.Save(previous);
+            }
+        }
         _units.Save(Result);
     }
 }

LehrerApp.Desktop/Views/ClassTeacher/ClassTeacherAbsencesView.axaml

@@ -27,9 +27,20 @@
     <Style Selector="TextBlock.status.danger">
       <Setter Property="Foreground" Value="{DynamicResource AppStatusDangerBrush}"/>
     </Style>
+    <Style Selector="Button.viewMode">
+      <Setter Property="Background" Value="Transparent"/>
+      <Setter Property="BorderBrush" Value="{DynamicResource AppFilterBorderBrush}"/>
+      <Setter Property="BorderThickness" Value="1"/>
+      <Setter Property="Padding" Value="12,6"/>
+    </Style>
+    <Style Selector="Button.viewMode.active">
+      <Setter Property="Background" Value="{DynamicResource AppFilterActiveBackgroundBrush}"/>
+      <Setter Property="BorderBrush" Value="{DynamicResource AppFilterActiveBorderBrush}"/>
+      <Setter Property="Foreground" Value="{DynamicResource AppFilterActiveForegroundBrush}"/>
+    </Style>
   </UserControl.Styles>
 
-  <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="16" RowSpacing="10">
+  <Grid RowDefinitions="Auto,Auto,Auto,*,Auto" Margin="16" RowSpacing="10">
     <Grid Grid.Row="0" ColumnDefinitions="*,Auto">
       <StackPanel>
         <TextBlock Text="Fehlzeiten" FontSize="22" FontWeight="SemiBold"/>
@@ -39,7 +50,20 @@
               IsEnabled="{Binding !Busy}" Background="Transparent" Foreground="{DynamicResource AppAccentTextBrush}" VerticalAlignment="Center"/>
     </Grid>
 
-    <Border Grid.Row="1" Classes="filterCard">
+    <Grid Grid.Row="1" ColumnDefinitions="Auto,Auto,*,Auto,Auto,Auto" ColumnSpacing="6">
+      <Button Grid.Column="0" Content="Liste" Classes="viewMode" Classes.active="{Binding !ShowMonthlyCalendar}"
+              Command="{Binding ShowAbsenceListCommand}"/>
+      <Button Grid.Column="1" Content="Monatsübersicht" Classes="viewMode" Classes.active="{Binding ShowMonthlyCalendar}"
+              Command="{Binding ShowCalendarCommand}"/>
+      <Button Grid.Column="3" Content="‹" Width="36" Command="{Binding PreviousCalendarMonthCommand}"
+              IsVisible="{Binding ShowMonthlyCalendar}" AutomationProperties.Name="Vorheriger Monat"/>
+      <TextBlock Grid.Column="4" Text="{Binding CalendarMonthLabel}" FontSize="15" FontWeight="SemiBold"
+                 VerticalAlignment="Center" Margin="8,0" IsVisible="{Binding ShowMonthlyCalendar}"/>
+      <Button Grid.Column="5" Content="›" Width="36" Command="{Binding NextCalendarMonthCommand}"
+              IsVisible="{Binding ShowMonthlyCalendar}" AutomationProperties.Name="Nächster Monat"/>
+    </Grid>
+
+    <Border Grid.Row="2" Classes="filterCard" IsVisible="{Binding !ShowMonthlyCalendar}">
       <Grid RowDefinitions="Auto,Auto" RowSpacing="8">
         <Grid Grid.Row="0" ColumnDefinitions="155,Auto,*,Auto,*" ColumnSpacing="8">
           <ComboBox Grid.Column="0" SelectedIndex="{Binding QuickRangeIndex, Mode=TwoWay}">
@@ -59,10 +83,11 @@
       </Grid>
     </Border>
 
-    <Grid Grid.Row="2">
+    <Grid Grid.Row="3">
       <DataGrid ItemsSource="{Binding AbsenceEntries}" AutoGenerateColumns="False" IsReadOnly="True"
                 GridLinesVisibility="Horizontal" BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1"
-                CanUserResizeColumns="True" CanUserSortColumns="True" RowHeight="48">
+                CanUserResizeColumns="True" CanUserSortColumns="True" RowHeight="48"
+                IsVisible="{Binding !ShowMonthlyCalendar}">
         <DataGrid.Columns>
           <DataGridTextColumn Header="Datum" Binding="{Binding DateLabel}" Width="105"/>
           <DataGridTextColumn Header="Schüler*in" Binding="{Binding StudentDisplayName}" Width="1.3*"/>
@@ -92,11 +117,61 @@
           <DataGridTextColumn Header="Grund / Notiz" Binding="{Binding DetailLabel}" Width="2*"/>
         </DataGrid.Columns>
       </DataGrid>
-      <StackPanel IsVisible="{Binding !HasAbsenceEntries}" HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="5">
+      <StackPanel IsVisible="{Binding ShowAbsenceListEmpty}" HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="5">
         <TextBlock Text="Keine Fehlzeiten im gewählten Zeitraum" FontWeight="SemiBold"/>
         <TextBlock Text="Passe Zeitraum oder Schülerfilter an." FontSize="12" Opacity="0.55"/>
       </StackPanel>
+
+      <Grid IsVisible="{Binding ShowMonthlyCalendar}" RowDefinitions="Auto,Auto,*" RowSpacing="8">
+        <WrapPanel Grid.Row="0" ItemSpacing="12" LineSpacing="6">
+          <TextBlock Text="V  verspätet" Foreground="#EF6C00" FontSize="11" FontWeight="SemiBold"/>
+          <TextBlock Text="A  abwesend" Foreground="#1565C0" FontSize="11" FontWeight="SemiBold"/>
+          <TextBlock Text="U  unentschuldigt" Foreground="#C62828" FontSize="11" FontWeight="SemiBold"/>
+          <TextBlock Text="E  entschuldigt" Foreground="#2E7D32" FontSize="11" FontWeight="SemiBold"/>
+          <TextBlock Text="!  negativer Klassenbucheintrag" Foreground="#8E24AA" FontSize="11" FontWeight="SemiBold"/>
+          <CheckBox Content="Hausaufgaben (H) einblenden" IsChecked="{Binding IncludeHomeworkInCalendar}"
+                    FontSize="11" VerticalAlignment="Center"/>
+        </WrapPanel>
+        <Grid Grid.Row="1" ColumnDefinitions="*,*,*,*,*" Margin="0,2,0,0">
+          <TextBlock Grid.Column="0" Text="Montag" FontWeight="SemiBold" HorizontalAlignment="Center"/>
+          <TextBlock Grid.Column="1" Text="Dienstag" FontWeight="SemiBold" HorizontalAlignment="Center"/>
+          <TextBlock Grid.Column="2" Text="Mittwoch" FontWeight="SemiBold" HorizontalAlignment="Center"/>
+          <TextBlock Grid.Column="3" Text="Donnerstag" FontWeight="SemiBold" HorizontalAlignment="Center"/>
+          <TextBlock Grid.Column="4" Text="Freitag" FontWeight="SemiBold" HorizontalAlignment="Center"/>
         </Grid>
-    <TextBlock Grid.Row="3" Text="{Binding Status}" FontSize="11" Opacity="0.6"/>
+        <ScrollViewer Grid.Row="2">
+          <ItemsControl ItemsSource="{Binding CalendarDays}">
+            <ItemsControl.ItemsPanel>
+              <ItemsPanelTemplate><UniformGrid Columns="5"/></ItemsPanelTemplate>
+            </ItemsControl.ItemsPanel>
+            <ItemsControl.ItemTemplate>
+              <DataTemplate x:DataType="vm:ClassTeacherCalendarDay">
+                <Border BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1"
+                        Background="{DynamicResource AppCardBackgroundBrush}" MinHeight="112" Padding="7" Margin="2">
+                  <StackPanel Spacing="5">
+                    <TextBlock Text="{Binding DayLabel}" FontWeight="SemiBold" HorizontalAlignment="Right"/>
+                    <ItemsControl ItemsSource="{Binding Events}">
+                      <ItemsControl.ItemTemplate>
+                        <DataTemplate x:DataType="vm:ClassTeacherCalendarEvent">
+                          <Grid ColumnDefinitions="22,*" Margin="0,1" ToolTip.Tip="{Binding Tooltip}">
+                            <Border Width="18" Height="18" CornerRadius="9" Background="{Binding ColorHex}">
+                              <TextBlock Text="{Binding Code}" Foreground="White" FontSize="10" FontWeight="Bold"
+                                         HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                            </Border>
+                            <TextBlock Grid.Column="1" Text="{Binding StudentName}" FontSize="10"
+                                       TextTrimming="CharacterEllipsis" VerticalAlignment="Center"/>
+                          </Grid>
+                        </DataTemplate>
+                      </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+                  </StackPanel>
+                </Border>
+              </DataTemplate>
+            </ItemsControl.ItemTemplate>
+          </ItemsControl>
+        </ScrollViewer>
+      </Grid>
+    </Grid>
+    <TextBlock Grid.Row="4" Text="{Binding Status}" FontSize="11" Opacity="0.6"/>
   </Grid>
 </UserControl>

LehrerApp.Desktop/Views/Groups/PlanningTabView.axaml

@@ -6,9 +6,10 @@
 
   <Grid RowDefinitions="Auto,2*,Auto,Auto,2*" Margin="16">
 
-    <!-- Einheiten-Toolbar -->
+    <!-- Einheiten-Toolbar: Aktionen bewusst unter der Überschrift und in umbruchfähigen
-    <Grid Grid.Row="0" ColumnDefinitions="*,Auto" Margin="0,0,0,8">
+         Gruppen. So kollidieren Beschriftung und Buttons auch in schmaleren Fenstern nicht. -->
-      <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
+    <Grid Grid.Row="0" RowDefinitions="Auto,Auto" Margin="0,0,0,8" RowSpacing="6">
+      <StackPanel Grid.Row="0" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
         <TextBlock Text="Unterrichtseinheiten" FontSize="14" FontWeight="SemiBold"
                    VerticalAlignment="Center"/>
         <Button Content="↕ JSON" FontSize="11" Padding="7,3"
@@ -30,13 +31,16 @@
           </Button.Flyout>
         </Button>
       </StackPanel>
-      <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+      <WrapPanel Grid.Row="1" ItemSpacing="6" LineSpacing="6">
         <Button Content="＋ Einheit" Command="{Binding AddUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
-        <Button Content="Bearbeiten"          Command="{Binding EditUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
+        <Button Content="✎" Width="38" Command="{Binding EditUnitCommand}" IsEnabled="{Binding !IsReadOnly}"
-        <Button Content="Als Vorlage kopieren" Command="{Binding CopyUnitCommand}"/>
+                ToolTip.Tip="Ausgewählte Einheit bearbeiten" AutomationProperties.Name="Einheit bearbeiten"/>
-        <Button Content="Löschen"             Command="{Binding DeleteUnitCommand}" IsEnabled="{Binding !IsReadOnly}"/>
+        <Button Content="⧉" Width="38" Command="{Binding CopyUnitCommand}"
-        <Button Content="🤖 KI-Unterstützung" Command="{Binding AiAssistCommand}"/>
+                ToolTip.Tip="Als Vorlage in eine andere Lerngruppe kopieren" AutomationProperties.Name="Einheit als Vorlage kopieren"/>
-      </StackPanel>
+        <Button Content="⌫" Width="38" Command="{Binding DeleteUnitCommand}" IsEnabled="{Binding !IsReadOnly}"
+                ToolTip.Tip="Ausgewählte Einheit löschen" AutomationProperties.Name="Einheit löschen"/>
+        <Button Content="✦ KI-Unterstützung" Command="{Binding AiAssistCommand}"/>
+      </WrapPanel>
     </Grid>
 
     <!-- Einheiten-Tabelle -->
@@ -76,30 +80,34 @@
 
     <Separator Grid.Row="2" Margin="0,0,0,8"/>
 
-    <!-- Stunden-Toolbar -->
+    <!-- Stunden-Toolbar: häufige Aktionen bleiben beschriftet, sekundäre Aktionen sind als
-    <Grid Grid.Row="3" ColumnDefinitions="*,Auto" Margin="0,0,0,8">
+         kompakte Symbolbuttons gruppiert. Das WrapPanel darf bei Bedarf umbrechen. -->
-      <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center">
+    <Grid Grid.Row="3" RowDefinitions="Auto,Auto" Margin="0,0,0,8" RowSpacing="6">
+      <StackPanel Grid.Row="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">
+      <WrapPanel Grid.Row="1" ItemSpacing="6" LineSpacing="6">
         <Button Content="＋ Stunde" Command="{Binding AddLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
-        <Button Content="Serie erzeugen"         Command="{Binding GenerateLessonSeriesCommand}"
+        <Button Content="＋ Serie" 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="✎" Width="38" Command="{Binding EditLessonCommand}" IsEnabled="{Binding !IsReadOnly}"
-        <Button Content="Verschieben"            Command="{Binding MoveLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
+                ToolTip.Tip="Ausgewählte Stunde bearbeiten" AutomationProperties.Name="Stunde bearbeiten"/>
-        <Button Content="Einheit wechseln"       Command="{Binding ChangeLessonUnitCommand}" IsEnabled="{Binding !IsReadOnly}"
+        <Button Content="↔" Width="38" Command="{Binding MoveLessonCommand}" IsEnabled="{Binding !IsReadOnly}"
+                ToolTip.Tip="Ausgewählte Stunde verschieben" AutomationProperties.Name="Stunde verschieben"/>
+        <Button Content="⇄" Width="38" Command="{Binding ChangeLessonUnitCommand}" IsEnabled="{Binding !IsReadOnly}"
                 ToolTip.Tip="Ordnet die ausgewählte Stunde einer anderen Einheit derselben Gruppe zu."/>
-        <Button Content="Status weiter" Command="{Binding AdvanceLessonStatusCommand}" IsEnabled="{Binding !IsReadOnly}"
+        <Button Content="Status ›" Command="{Binding AdvanceLessonStatusCommand}" IsEnabled="{Binding !IsReadOnly}"
                 ToolTip.Tip="Entwurf/Geplant → Bereit → Durchgeführt"/>
-        <Button Content="Sitzung erzeugen"       Command="{Binding CreateParticipationSessionCommand}"
+        <Button Content="＋ Sitzung" 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}"/>
+        <Button Content="⌫" Width="38" Command="{Binding DeleteLessonCommand}" IsEnabled="{Binding !IsReadOnly}"
-      </StackPanel>
+                ToolTip.Tip="Ausgewählte Stunde löschen" AutomationProperties.Name="Stunde löschen"/>
+      </WrapPanel>
     </Grid>
 
     <!-- Stunden-Tabelle -->

LehrerApp.Desktop/Views/Groups/UnitDialog.axaml

@@ -41,6 +41,10 @@
           <TextBlock Text="Status" FontSize="12" Opacity="0.7"/>
           <ComboBox ItemsSource="{Binding StatusOptions}" SelectedItem="{Binding StatusName}"
                     HorizontalAlignment="Stretch"/>
+          <Border Background="#FFF3CD" BorderBrush="#D97706" BorderThickness="1" CornerRadius="5"
+                  Padding="9,6" IsVisible="{Binding StatusNotice, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
+            <TextBlock Text="{Binding StatusNotice}" Foreground="#92400E" FontSize="11" TextWrapping="Wrap"/>
+          </Border>
         </StackPanel>
 
         <StackPanel Spacing="4">