Klausuren-Hauptseite: gruppenübergreifende Liste mit Prioritäts-Score statt Datum

Sidebar-Klausuren war bisher ein Placeholder. Neue Seite zeigt alle Klausuren des
Schuljahres sortiert nach abgeleiteter Dringlichkeit (Korrekturfortschritt statt
manuellem Status), mit Detailbereich, Parallelkurs-Umschalter und Notenspiegel.

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

LehrerApp.Core/Models/Exam.cs

@@ -13,6 +13,12 @@ public class Exam
     public DateOnly? ReturnedAt { get; set; }
     public Niveau? Niveau { get; set; }
     public string? Notes { get; set; }
+    public DateOnly? ApprovalGrantedAt { get; set; }
+    public DateOnly? AnnouncedAt { get; set; }
+    /// Verknüpft Parallelklausuren (gleiche Arbeit, mehrere Kurse) für den Kurs-Umschalter
+    /// auf der Klausuren-Hauptseite — Id der "Ursprungs"-Klausur, gesetzt beim Duplizieren
+    /// (siehe ExamDialogViewModel.Save).
+    public Guid? SharedExamGroupId { get; set; }
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 }

LehrerApp.Core/Services/ExamPriorityService.cs

@@ -0,0 +1,67 @@
+using LehrerApp.Core.Models;
+
+namespace LehrerApp.Core.Services;
+
+/// Zählt den Korrekturfortschritt einer Klausur aus den vorhandenen Ergebnissen, statt einen
+/// eigenen "Korrektur läuft"-Status pflegen zu müssen — ein `ExamResult` gilt als erledigt, sobald
+/// entweder Punkte/Note eingetragen oder der Schüler als abwesend markiert wurde. Von
+/// DashboardViewModel (Karte "Offene Korrekturen") und ExamsOverviewViewModel (Klausuren-
+/// Hauptseite) gemeinsam genutzt, damit beide Stellen exakt dieselbe Zahl zeigen.
+public static class ExamCorrectionCounter
+{
+    public static (int Expected, int Evaluated) Count(Exam exam, List<GroupMembership> groupMemberships,
+        List<ExamResult> examResults)
+    {
+        var expected = groupMemberships.Count(m => GroupMembershipService.IsActiveOn(m, exam.Date));
+        var evaluated = examResults.Count(r => r.Absent || !string.IsNullOrWhiteSpace(r.Grade) || r.Points.Count > 0);
+        return (expected, Math.Min(evaluated, expected));
+    }
+}
+
+public enum ExamListStatus { Planned, AwaitingCorrection, CorrectionInProgress, CorrectionStuck, AwaitingReturn, Returned }
+
+public readonly record struct ExamPriorityInfo(ExamListStatus Status, double Score);
+
+/// Ordnet Klausuren für die Klausuren-Hauptseite nach einem unsichtbaren Prioritäts-Score statt
+/// nach Datum: unbearbeitete/überfällige Korrekturen oben, erledigte unten. "Korrektur läuft"
+/// wird bewusst nicht als eigener, manuell zu pflegender Status abgelegt (siehe
+/// `ExamCorrectionCounter`) — bleibt eine Klausur trotzdem lange in Bearbeitung hängen (typischer
+/// Grund: ein einzelner nie nachschreibender Schüler), fällt sie nach `StuckAfterDays` aus der
+/// dringenden Zone in eine ruhige "hängt fest"-Einstufung, statt dauerhaft oben zu kleben.
+public static class ExamPriorityService
+{
+    public const int StuckAfterDays = 21;
+    private const int CorrectionGraceDays = 3;
+
+    public static ExamPriorityInfo Evaluate(Exam exam, int expected, int evaluated, DateOnly today)
+    {
+        if (exam.Status == ExamStatus.Returned)
+            return new ExamPriorityInfo(ExamListStatus.Returned, -100);
+
+        if (exam.Status == ExamStatus.Graded)
+            return new ExamPriorityInfo(ExamListStatus.AwaitingReturn, 300);
+
+        if (exam.Status == ExamStatus.Planned)
+        {
+            var daysUntil = exam.Date.DayNumber - today.DayNumber;
+            return new ExamPriorityInfo(ExamListStatus.Planned, Math.Clamp(150 - daysUntil, 20, 150));
+        }
+
+        // Status == Conducted: Korrekturfortschritt entscheidet über die genaue Einstufung.
+        var daysSince = today.DayNumber - exam.Date.DayNumber;
+
+        if (evaluated <= 0)
+        {
+            var score = daysSince <= CorrectionGraceDays ? 400 + daysSince * 10 : 600 + daysSince;
+            return new ExamPriorityInfo(ExamListStatus.AwaitingCorrection, score);
+        }
+
+        if (expected > 0 && evaluated >= expected)
+            return new ExamPriorityInfo(ExamListStatus.AwaitingReturn, 300);
+
+        if (daysSince > StuckAfterDays)
+            return new ExamPriorityInfo(ExamListStatus.CorrectionStuck, 90);
+
+        return new ExamPriorityInfo(ExamListStatus.CorrectionInProgress, 400 + daysSince * 3);
+    }
+}

LehrerApp.Desktop.Tests/ExamGradingDialogViewModelTests.cs

@@ -0,0 +1,65 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using LehrerApp.Desktop.ViewModels.Groups;
+using Xunit;
+
+namespace LehrerApp.Desktop.Tests;
+
+/// Deckt 1.6.3 (Bulk-Aktion "Rest als abwesend markieren") ab — löst das Nutzer-Feedback, dass
+/// Schüler, die nie nachschreiben, sonst dauerhaft eine leere, unberührte Zeile hinterlassen.
+public sealed class ExamGradingDialogViewModelTests
+{
+    [Fact]
+    public void MarkRemainingAbsent_MarktNurUnberührteZeilenAbwesend()
+    {
+        var group = new LearningGroup { Name = "Q1 Chemie" };
+        var studentWithPoints = new Student { FirstName = "Anna", LastName = "Bauer" };
+        var untouchedStudent1 = new Student { FirstName = "Ben", LastName = "Cordes" };
+        var untouchedStudent2 = new Student { FirstName = "Cara", LastName = "Diehl" };
+        var students = new FakeStudents([studentWithPoints, untouchedStudent1, untouchedStudent2]);
+        var memberships = new FakeMemberships(
+        [
+            new GroupMembership { GroupId = group.Id, StudentId = studentWithPoints.Id },
+            new GroupMembership { GroupId = group.Id, StudentId = untouchedStudent1.Id },
+            new GroupMembership { GroupId = group.Id, StudentId = untouchedStudent2.Id },
+        ]);
+        var exam = new Exam
+        {
+            GroupId = group.Id,
+            Title = "Klausur 1",
+            Tasks = [new ExamTask { Nr = 1, MaxPoints = 10 }],
+            GradingKey = GradingService.DefaultKey1To6(),
+        };
+        var results = new FakeResults();
+
+        var vm = new ExamGradingDialogViewModel(results, students, memberships,
+            new GradingService(), exam, group.Id);
+
+        var rowWithPoints = vm.Rows.Single(r => r.StudentId == studentWithPoints.Id);
+        rowWithPoints.Cells[0].TrySetValue(7);
+
+        vm.MarkRemainingAbsentCommand.Execute(null);
+
+        Assert.False(rowWithPoints.Absent);
+        Assert.True(vm.Rows.Single(r => r.StudentId == untouchedStudent1.Id).Absent);
+        Assert.True(vm.Rows.Single(r => r.StudentId == untouchedStudent2.Id).Absent);
+    }
+
+    [Fact]
+    public void MarkRemainingAbsent_LässtBereitsAbwesendMarkierteUnverändert()
+    {
+        var group = new LearningGroup { Name = "Q1 Chemie" };
+        var student = new Student { FirstName = "Ben", LastName = "Cordes" };
+        var students = new FakeStudents([student]);
+        var memberships = new FakeMemberships(
+            [new GroupMembership { GroupId = group.Id, StudentId = student.Id }]);
+        var exam = new Exam { GroupId = group.Id, Title = "Klausur 1", Tasks = [new ExamTask { Nr = 1, MaxPoints = 10 }], GradingKey = GradingService.DefaultKey1To6() };
+        var vm = new ExamGradingDialogViewModel(new FakeResults(), students, memberships,
+            new GradingService(), exam, group.Id);
+
+        vm.Rows[0].Absent = true;
+        vm.MarkRemainingAbsentCommand.Execute(null);
+
+        Assert.True(vm.Rows[0].Absent);
+    }
+}

LehrerApp.Desktop.Tests/ExamsOverviewViewModelTests.cs

@@ -0,0 +1,89 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using LehrerApp.Desktop.ViewModels.Exams;
+using Xunit;
+
+namespace LehrerApp.Desktop.Tests;
+
+/// Deckt 1.6 (Klausuren-Hauptseite) ab: Priorisierung end-to-end über die ViewModel-Schicht,
+/// Parallelkurs-Umschalter (1.6.4) und Genehmigung/Ankündigung (1.6.5).
+public sealed class ExamsOverviewViewModelTests
+{
+    private static ExamsOverviewViewModel BuildVm(List<LearningGroup> groups, List<Exam> exams,
+        FakeMemberships? memberships = null, FakeResults? results = null) =>
+        new(new FakeExams(exams), results ?? new FakeResults(), new FakeGroups(groups),
+            memberships ?? new FakeMemberships([]), new GradingService(), new SchoolYearService());
+
+    [Fact]
+    public void Load_UnbearbeiteteKorrekturStehtVorGeplanterKlausur()
+    {
+        var group = new LearningGroup { Name = "Q1 Chemie", SchoolYear = new SchoolYearService().CurrentSchoolYear() };
+        var today = DateOnly.FromDateTime(DateTime.Today);
+        var overdue = new Exam { GroupId = group.Id, Title = "Alte Klausur", Status = ExamStatus.Conducted, Date = today.AddDays(-10) };
+        var planned = new Exam { GroupId = group.Id, Title = "Neue Klausur", Status = ExamStatus.Planned, Date = today.AddDays(3) };
+
+        var vm = BuildVm([group], [overdue, planned]);
+        vm.LoadCommand.Execute(null);
+
+        Assert.Equal("Alte Klausur", vm.Rows[0].Title);
+        Assert.Equal("Neue Klausur", vm.Rows[1].Title);
+    }
+
+    [Fact]
+    public void Load_ParallelkurseWerdenAlsGeschwisterErkannt()
+    {
+        var groupA = new LearningGroup { Name = "Chemie GK Q1", SchoolYear = new SchoolYearService().CurrentSchoolYear() };
+        var groupB = new LearningGroup { Name = "Chemie GK Q1b", SchoolYear = groupA.SchoolYear };
+        var original = new Exam { GroupId = groupA.Id, Title = "Redox", Status = ExamStatus.Planned, Date = DateOnly.FromDateTime(DateTime.Today).AddDays(5) };
+        var duplicate = new Exam
+        {
+            GroupId = groupB.Id, Title = "Redox", Status = ExamStatus.Planned,
+            Date = DateOnly.FromDateTime(DateTime.Today).AddDays(6), SharedExamGroupId = original.Id,
+        };
+
+        var vm = BuildVm([groupA, groupB], [original, duplicate]);
+        vm.LoadCommand.Execute(null);
+
+        vm.SelectedRow = vm.Rows.Single(r => r.Exam.Id == original.Id);
+        Assert.True(vm.SelectedRow.HasSibling);
+        Assert.Single(vm.Siblings);
+        Assert.Equal(duplicate.Id, vm.Siblings[0].Exam.Id);
+    }
+
+    [Fact]
+    public void ToggleApproval_SetztUndLöschtDatum()
+    {
+        var group = new LearningGroup { Name = "Q1 Chemie", SchoolYear = new SchoolYearService().CurrentSchoolYear() };
+        var exam = new Exam { GroupId = group.Id, Title = "Klausur", Status = ExamStatus.Planned, Date = DateOnly.FromDateTime(DateTime.Today).AddDays(2) };
+        var vm = BuildVm([group], [exam]);
+        vm.LoadCommand.Execute(null);
+        vm.SelectedRow = vm.Rows[0];
+
+        vm.ToggleApprovalCommand.Execute(null);
+        Assert.NotNull(exam.ApprovalGrantedAt);
+        Assert.StartsWith("Genehmigt am", vm.ApprovalLabel);
+
+        vm.ToggleApprovalCommand.Execute(null);
+        Assert.Null(exam.ApprovalGrantedAt);
+        Assert.Equal("Genehmigung noch ausstehend", vm.ApprovalLabel);
+    }
+
+    [Fact]
+    public void Selection_ZeigtKorrekturfortschrittOderNotenspiegelJeNachStatus()
+    {
+        var group = new LearningGroup { Name = "Q1 Chemie", SchoolYear = new SchoolYearService().CurrentSchoolYear() };
+        var today = DateOnly.FromDateTime(DateTime.Today);
+        var conducted = new Exam { GroupId = group.Id, Title = "Läuft", Status = ExamStatus.Conducted, Date = today.AddDays(-2) };
+        var returned = new Exam { GroupId = group.Id, Title = "Fertig", Status = ExamStatus.Returned, Date = today.AddDays(-20) };
+        var vm = BuildVm([group], [conducted, returned]);
+        vm.LoadCommand.Execute(null);
+
+        vm.SelectedRow = vm.Rows.Single(r => r.Exam.Id == conducted.Id);
+        Assert.True(vm.ShowCorrectionProgress);
+        Assert.False(vm.ShowGradeSummary);
+
+        vm.SelectedRow = vm.Rows.Single(r => r.Exam.Id == returned.Id);
+        Assert.False(vm.ShowCorrectionProgress);
+        Assert.True(vm.ShowGradeSummary);
+    }
+}

LehrerApp.Desktop/AppBootstrapper.cs

@@ -6,6 +6,7 @@ using LehrerApp.Data.Repositories;
 using LehrerApp.Desktop.Services;
 using LehrerApp.Desktop.ViewModels;
 using LehrerApp.Desktop.ViewModels.ClassTeacher;
+using LehrerApp.Desktop.ViewModels.Exams;
 using LehrerApp.Desktop.ViewModels.Groups;
 using LehrerApp.Desktop.ViewModels.Planning;
 using LehrerApp.Desktop.ViewModels.Settings;
@@ -306,6 +307,7 @@ public static class AppBootstrapper
         services.AddSingleton<WorkloadViewModel>();
         services.AddSingleton<ClassTeacherDetailsViewModel>();
         services.AddSingleton<ClassTeacherOverviewViewModel>();
+        services.AddSingleton<ExamsOverviewViewModel>();
 
         // Transient: neue Instanz pro Navigation (für Detailseiten)
         services.AddTransient<GroupDetailViewModel>();

LehrerApp.Desktop/ViewModels/DashboardViewModel.cs

@@ -386,12 +386,10 @@ public partial class DashboardViewModel : ObservableObject
                      .Where(e => e.Status is ExamStatus.Conducted or ExamStatus.Graded)
                      .OrderBy(e => e.Date))
         {
-            var expected = _memberships.GetByGroup(group.Id)
+            var (expected, evaluated) = ExamCorrectionCounter.Count(exam,
-                .Count(m => GroupMembershipService.IsActiveOn(m, exam.Date));
+                _memberships.GetByGroup(group.Id), _examResults.GetByExam(exam.Id));
-            var evaluated = _examResults.GetByExam(exam.Id)
-                .Count(r => r.Absent || !string.IsNullOrWhiteSpace(r.Grade) || r.Points.Count > 0);
             OpenCorrections.Add(new CorrectionProgressItem(exam.Id, group.Id, exam.Title,
-                group.Name, exam.Date, Math.Min(evaluated, expected), expected, today));
+                group.Name, exam.Date, evaluated, expected, today));
         }
     }
 

LehrerApp.Desktop/ViewModels/Exams/ExamsOverviewViewModel.cs

@@ -0,0 +1,253 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using LehrerApp.Desktop.ViewModels.Groups;
+using System.Collections.ObjectModel;
+using System.Globalization;
+
+namespace LehrerApp.Desktop.ViewModels.Exams;
+
+/// Klausuren-Hauptseite (Sidebar "Klausuren"): gruppenübergreifende Liste aller Klausuren des
+/// aktuellen Schuljahres, sortiert nach einem unsichtbaren Prioritäts-Score
+/// (`ExamPriorityService`) statt nach Datum — unbearbeitete/überfällige Korrekturen oben,
+/// erledigte unten. Oben ein Detailbereich zur ausgewählten Klausur, der sich je nach Status
+/// unterscheidet (Korrekturfortschritt vs. Notenspiegel), inklusive Umschalter für Parallelkurse
+/// (gleiche Arbeit, mehrere Kurse — siehe `Exam.SharedExamGroupId`).
+public partial class ExamsOverviewViewModel : ObservableObject
+{
+    private readonly IExamRepository _exams;
+    private readonly IExamResultRepository _examResults;
+    private readonly IGroupRepository _groups;
+    private readonly IGroupMembershipRepository _memberships;
+    private readonly GradingService _grading;
+    private readonly SchoolYearService _schoolYear;
+
+    public ObservableCollection<ExamListRowViewModel> Rows { get; } = [];
+    public ObservableCollection<ExamListRowViewModel> Siblings { get; } = [];
+    public ObservableCollection<GradeBarItem> DetailGradeDistribution { get; } = [];
+
+    [ObservableProperty] private ExamListRowViewModel? _selectedRow;
+    [ObservableProperty] private bool _hasSelection;
+    [ObservableProperty] private string _emptyHint = "";
+
+    [ObservableProperty] private bool _showCorrectionProgress;
+    [ObservableProperty] private string _progressLabel = "";
+    [ObservableProperty] private double _progressBarWidth;
+    [ObservableProperty] private bool _showGradeSummary;
+    [ObservableProperty] private string _averageLabel = "";
+    [ObservableProperty] private string _approvalLabel = "";
+    [ObservableProperty] private string _announcementLabel = "";
+
+    public Func<Exam, Task>? OnGradeExam { get; set; }
+    public Func<Exam, Task>? OnEvaluateExam { get; set; }
+    public Action<Guid>? OnNavigateToGroup { get; set; }
+
+    public ExamsOverviewViewModel(IExamRepository exams, IExamResultRepository examResults,
+        IGroupRepository groups, IGroupMembershipRepository memberships, GradingService grading,
+        SchoolYearService schoolYear)
+    {
+        _exams = exams; _examResults = examResults; _groups = groups;
+        _memberships = memberships; _grading = grading; _schoolYear = schoolYear;
+    }
+
+    [RelayCommand]
+    public void Load()
+    {
+        var selectedId = SelectedRow?.Exam.Id;
+        Rows.Clear();
+
+        var groups = _groups.GetBySchoolYear(_schoolYear.CurrentSchoolYear());
+        var today = DateOnly.FromDateTime(DateTime.Today);
+
+        var rows = new List<ExamListRowViewModel>();
+        foreach (var group in groups)
+        {
+            var groupMemberships = _memberships.GetByGroup(group.Id);
+            foreach (var exam in _exams.GetByGroup(group.Id))
+            {
+                var (expected, evaluated) = ExamCorrectionCounter.Count(exam, groupMemberships,
+                    _examResults.GetByExam(exam.Id));
+                var info = ExamPriorityService.Evaluate(exam, expected, evaluated, today);
+                rows.Add(new ExamListRowViewModel(exam, group, expected, evaluated, info, today));
+            }
+        }
+
+        // Parallelkurse markieren, damit die Liste einen Verknüpfungs-Hinweis zeigen kann.
+        foreach (var group in rows.GroupBy(r => r.Exam.SharedExamGroupId ?? r.Exam.Id))
+        {
+            if (group.Count() <= 1) continue;
+            foreach (var row in group) row.HasSibling = true;
+        }
+
+        foreach (var row in rows.OrderByDescending(r => r.Score))
+            Rows.Add(row);
+
+        EmptyHint = Rows.Count == 0 ? "Keine Klausuren angelegt." : "";
+        SelectedRow = selectedId is { } id
+            ? Rows.FirstOrDefault(r => r.Exam.Id == id) ?? Rows.FirstOrDefault()
+            : Rows.FirstOrDefault();
+    }
+
+    partial void OnSelectedRowChanged(ExamListRowViewModel? value) => UpdateDetail(value);
+
+    private void UpdateDetail(ExamListRowViewModel? row)
+    {
+        HasSelection = row is not null;
+        Siblings.Clear();
+        DetailGradeDistribution.Clear();
+        ShowCorrectionProgress = false;
+        ShowGradeSummary = false;
+        if (row is null) return;
+
+        ApprovalLabel = row.Exam.ApprovalGrantedAt is { } a
+            ? $"Genehmigt am {a.ToString("dd.MM.yyyy", CultureInfo.InvariantCulture)}"
+            : "Genehmigung noch ausstehend";
+        AnnouncementLabel = row.Exam.AnnouncedAt is { } n
+            ? $"Angekündigt am {n.ToString("dd.MM.yyyy", CultureInfo.InvariantCulture)}"
+            : "Noch nicht angekündigt";
+
+        if (row.HasSibling)
+        {
+            var anchor = row.Exam.SharedExamGroupId ?? row.Exam.Id;
+            foreach (var sibling in Rows.Where(r => r != row && (r.Exam.SharedExamGroupId ?? r.Exam.Id) == anchor))
+                Siblings.Add(sibling);
+        }
+
+        ShowCorrectionProgress = row.Status is ExamListStatus.AwaitingCorrection
+            or ExamListStatus.CorrectionInProgress or ExamListStatus.CorrectionStuck;
+        if (ShowCorrectionProgress)
+        {
+            ProgressLabel = $"{row.Evaluated} / {row.Expected} korrigiert";
+            var fraction = row.Expected <= 0 ? 0 : Math.Clamp((double)row.Evaluated / row.Expected, 0, 1);
+            ProgressBarWidth = fraction * 240.0;
+        }
+
+        ShowGradeSummary = row.Status is ExamListStatus.AwaitingReturn or ExamListStatus.Returned;
+        if (ShowGradeSummary) LoadGradeSummary(row);
+    }
+
+    private void LoadGradeSummary(ExamListRowViewModel row)
+    {
+        var grades = _examResults.GetByExam(row.Exam.Id)
+            .Where(r => !r.Absent && !string.IsNullOrWhiteSpace(r.Grade))
+            .Select(r => r.Grade!).ToList();
+        if (grades.Count == 0) { AverageLabel = "Noch keine Noten erfasst."; return; }
+
+        AverageLabel = "Ø " + _grading.WeightedAverage(grades.Select(g => (Grade: g, Weight: 1.0)).ToList())
+            .ToString("0.00", CultureInfo.InvariantCulture);
+
+        var counts = grades.GroupBy(g => g).ToDictionary(g => g.Key, g => g.Count());
+        var maxCount = counts.Count == 0 ? 0 : counts.Values.Max();
+        foreach (var entry in row.Exam.GradingKey.OrderByDescending(e => e.MinPercent))
+        {
+            counts.TryGetValue(entry.Grade, out var count);
+            DetailGradeDistribution.Add(new GradeBarItem(entry.Grade, count, grades.Count, maxCount));
+        }
+    }
+
+    [RelayCommand]
+    private void SelectExam(ExamListRowViewModel row) => SelectedRow = row;
+
+    [RelayCommand]
+    private async Task GradeSelected()
+    {
+        if (SelectedRow is null || OnGradeExam is null) return;
+        await OnGradeExam(SelectedRow.Exam);
+        Load();
+    }
+
+    [RelayCommand]
+    private async Task EvaluateSelected()
+    {
+        if (SelectedRow is null || OnEvaluateExam is null) return;
+        await OnEvaluateExam(SelectedRow.Exam);
+        Load();
+    }
+
+    [RelayCommand]
+    private void GoToGroup()
+    {
+        if (SelectedRow is null) return;
+        OnNavigateToGroup?.Invoke(SelectedRow.GroupId);
+    }
+
+    [RelayCommand]
+    private void ToggleApproval() => ToggleDate(SelectedRow?.Exam, e => e.ApprovalGrantedAt,
+        (e, v) => e.ApprovalGrantedAt = v);
+
+    [RelayCommand]
+    private void ToggleAnnouncement() => ToggleDate(SelectedRow?.Exam, e => e.AnnouncedAt,
+        (e, v) => e.AnnouncedAt = v);
+
+    private void ToggleDate(Exam? exam, Func<Exam, DateOnly?> get, Action<Exam, DateOnly?> set)
+    {
+        if (exam is null) return;
+        set(exam, get(exam) is null ? DateOnly.FromDateTime(DateTime.Today) : null);
+        exam.UpdatedAt = DateTime.UtcNow;
+        _exams.Save(exam);
+        UpdateDetail(SelectedRow);
+    }
+}
+
+// ── Zeile in der Klausurliste ────────────────────────────────────────────────
+
+public class ExamListRowViewModel
+{
+    public Exam Exam { get; }
+    public Guid GroupId { get; }
+    public string Title { get; }
+    public string GroupLabel { get; }
+    public int Expected { get; }
+    public int Evaluated { get; }
+    public ExamListStatus Status { get; }
+    public double Score { get; }
+    public string StatusLabel { get; }
+    public string SubLabel { get; }
+    public bool HasSibling { get; set; }
+
+    public bool IsOk { get; }
+    public bool IsInfo { get; }
+    public bool IsWarning { get; }
+    public bool IsDanger { get; }
+
+    public ExamListRowViewModel(Exam exam, LearningGroup group, int expected, int evaluated,
+        ExamPriorityInfo info, DateOnly today)
+    {
+        Exam = exam; GroupId = group.Id; Title = exam.Title; GroupLabel = group.Name;
+        Expected = expected; Evaluated = evaluated; Status = info.Status; Score = info.Score;
+
+        (StatusLabel, SubLabel, IsOk, IsInfo, IsWarning, IsDanger) = Status switch
+        {
+            ExamListStatus.Planned => ("Geplant", $"geplant für {RelativeDay(exam.Date, today)}",
+                false, false, false, false),
+            ExamListStatus.AwaitingCorrection when today.DayNumber - exam.Date.DayNumber <= 3 =>
+                ("Korrektur ausstehend", $"geschrieben {RelativeDay(exam.Date, today)}",
+                    false, false, true, false),
+            ExamListStatus.AwaitingCorrection =>
+                ("überfällig", $"geschrieben {RelativeDay(exam.Date, today)}", false, false, false, true),
+            ExamListStatus.CorrectionInProgress =>
+                ("Korrektur läuft", $"{evaluated}/{expected} korrigiert", false, false, true, false),
+            ExamListStatus.CorrectionStuck =>
+                ("hängt fest", $"{evaluated}/{expected} korrigiert", false, false, false, false),
+            ExamListStatus.AwaitingReturn => ("Korrigiert", "Rückgabe aussteht", false, true, false, false),
+            ExamListStatus.Returned => ("Abgeschlossen",
+                exam.ReturnedAt is { } r ? $"zurückgegeben {r:dd.MM.yyyy}" : "zurückgegeben", true, false, false, false),
+            _ => ("", "", false, false, false, false),
+        };
+    }
+
+    private static string RelativeDay(DateOnly date, DateOnly today)
+    {
+        var diff = date.DayNumber - today.DayNumber;
+        return diff switch
+        {
+            0 => "heute",
+            1 => "morgen",
+            -1 => "gestern",
+            > 1 => $"in {diff} Tagen",
+            _ => $"vor {-diff} Tagen",
+        };
+    }
+}

LehrerApp.Desktop/ViewModels/Groups/ExamGradingViewModels.cs

@@ -1,4 +1,5 @@
 using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
 using LehrerApp.Core.Interfaces;
 using LehrerApp.Core.Models;
 using LehrerApp.Core.Services;
@@ -52,6 +53,16 @@ public partial class ExamGradingDialogViewModel : ObservableObject
 
     private void SaveRow(ExamResultRow row) => _results.Save(row.ToModel(_exam.Id));
 
+    /// Rest als abwesend markieren (Nutzerwunsch): Schüler, die nie nachschreiben, blockieren
+    /// sonst dauerhaft den live abgeleiteten Korrekturstatus (ExamPriorityService), weil niemand
+    /// eine leere Zeile anfasst, für die es nichts einzutragen gibt. Rührt bewusst nur unberührte
+    /// Zeilen an — bereits eingetragene Punkte/Kommentare bleiben unangetastet.
+    [RelayCommand]
+    private void MarkRemainingAbsent()
+    {
+        foreach (var row in Rows.Where(r => !r.Absent && r.Cells.All(c => c.Value is null)))
+            row.Absent = true;
+    }
 }
 
 // ── Zeile im Punkteraster ──────────────────────────────────────────────────

LehrerApp.Desktop/ViewModels/Groups/ExamViewModels.cs

@@ -21,6 +21,7 @@ public partial class ExamDialogViewModel : ObservableObject
     private readonly int _gradeLevel;
     private readonly GradingSystem _gradingSystem;
     private readonly Exam? _editingExam;
+    private readonly Exam? _duplicateSource;
     private readonly string _subjectName;
 
     [ObservableProperty] private string _title = "";
@@ -68,6 +69,7 @@ public partial class ExamDialogViewModel : ObservableObject
         _groupId = groupId; _subjectId = subjectId; _gradeLevel = gradeLevel;
         _gradingSystem = gradingSystem;
         _editingExam = editingExam;
+        _duplicateSource = duplicateSource;
         _subjectName = defaultSubjectName;
         IsDifferentiated = isDifferentiated;
 
@@ -304,6 +306,11 @@ public partial class ExamDialogViewModel : ObservableObject
         Result.Niveau     = NiveauDisplay.FromName(SelectedNiveauName);
         Result.Tasks      = Tasks.Select(t => t.ToModel()).ToList();
         Result.GradingKey = gradingKey;
+        // Parallelkurse (gleiche Arbeit, mehrere Kurse): beim Duplizieren verknüpfen, damit die
+        // Klausuren-Hauptseite zwischen ihnen umschalten kann. Der Anker ist die Id der zuerst
+        // angelegten Klausur der Kette — schon verknüpfte Quellen geben ihren Anker weiter.
+        if (_duplicateSource is not null)
+            Result.SharedExamGroupId = _duplicateSource.SharedExamGroupId ?? _duplicateSource.Id;
         _exams.Save(Result);
     }
 }

LehrerApp.Desktop/ViewModels/MainWindowViewModel.cs

@@ -4,6 +4,7 @@ using CommunityToolkit.Mvvm.Input;
 using LehrerApp.Core.Services;
 using LehrerApp.Desktop.Services;
 using LehrerApp.Desktop.ViewModels.ClassTeacher;
+using LehrerApp.Desktop.ViewModels.Exams;
 using LehrerApp.Desktop.ViewModels.Groups;
 using LehrerApp.Desktop.ViewModels.Planning;
 using LehrerApp.Desktop.ViewModels.Settings;
@@ -90,6 +91,7 @@ public partial class MainWindowViewModel : ObservableObject
             case WorkloadViewModel vm:
                 vm.Tasks.Load(); vm.TimeTracking.Load(); vm.Evaluation.Load(); break;
             case ClassTeacherOverviewViewModel vm: vm.LoadCommand.Execute(null); break;
+            case ExamsOverviewViewModel vm: vm.LoadCommand.Execute(null); break;
             case GroupDetailViewModel { Group: { } group } vm: vm.LoadGroup(group.Id); break;
             // Inline-Bearbeitung (IsEditing) nicht überschreiben - anders als die Gruppenansicht
             // laufen Namens-/Geschlechtsänderungen hier nicht über einen Dialog.
@@ -119,7 +121,7 @@ public partial class MainWindowViewModel : ObservableObject
             NavItem.Dashboard => GetDashboard(),
             NavItem.Groups    => _services.GetRequiredService<GroupListViewModel>(),
             NavItem.Students  => GetStudents(),
-            NavItem.Exams     => new PlaceholderViewModel { Title = "Klausuren", Icon = "📝" },
+            NavItem.Exams     => GetExams(),
             NavItem.Planner   => GetTimetable(),
             NavItem.Workload  => GetWorkload(),
             NavItem.ClassTeacher => GetClassTeacherOverview(),
@@ -162,6 +164,13 @@ public partial class MainWindowViewModel : ObservableObject
         return workload;
     }
 
+    private ExamsOverviewViewModel GetExams()
+    {
+        var exams = _services.GetRequiredService<ExamsOverviewViewModel>();
+        exams.LoadCommand.Execute(null);
+        return exams;
+    }
+
     private ClassTeacherOverviewViewModel GetClassTeacherOverview()
     {
         var vm = _services.GetRequiredService<ClassTeacherOverviewViewModel>();

LehrerApp.Desktop/Views/Exams/ExamsOverviewView.axaml

@@ -0,0 +1,222 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Exams"
+             xmlns:vmg="clr-namespace:LehrerApp.Desktop.ViewModels.Groups"
+             xmlns:shared="clr-namespace:LehrerApp.Desktop.Views.Shared"
+             x:Class="LehrerApp.Desktop.Views.Exams.ExamsOverviewView"
+             x:DataType="vm:ExamsOverviewViewModel">
+
+  <!-- Statusfarben kommen wie im Klassenlehrer-Bereich aus Styles/SemanticBrushes.axaml (siehe
+       ClassTeacherOverviewView) — Basis ist hier aber "neutral" statt "ok", weil geplante bzw.
+       hängengebliebene Klausuren (ExamPriorityService.CorrectionStuck) hier den Normalfall
+       bilden, nicht ein positives Ergebnis. -->
+  <UserControl.Styles>
+    <Style Selector="Border.examStatusBar">
+      <Setter Property="Background" Value="{DynamicResource AppListRowBorderBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusBar.ok">
+      <Setter Property="Background" Value="{DynamicResource AppStatusOkBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusBar.info">
+      <Setter Property="Background" Value="{DynamicResource AppStatusInfoBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusBar.warning">
+      <Setter Property="Background" Value="{DynamicResource AppStatusWarningBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusBar.danger">
+      <Setter Property="Background" Value="{DynamicResource AppStatusDangerBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusPill">
+      <Setter Property="Background" Value="{DynamicResource AppChipBackgroundBrush}"/>
+      <Setter Property="CornerRadius" Value="4"/>
+      <Setter Property="Padding" Value="8,2"/>
+    </Style>
+    <Style Selector="Border.examStatusPill TextBlock">
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.ok">
+      <Setter Property="Background" Value="{DynamicResource AppStatusOkBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.ok TextBlock">
+      <Setter Property="Foreground" Value="White"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.info">
+      <Setter Property="Background" Value="{DynamicResource AppStatusInfoBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.info TextBlock">
+      <Setter Property="Foreground" Value="White"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.warning">
+      <Setter Property="Background" Value="{DynamicResource AppStatusWarningBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.warning TextBlock">
+      <Setter Property="Foreground" Value="White"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.danger">
+      <Setter Property="Background" Value="{DynamicResource AppStatusDangerBrush}"/>
+    </Style>
+    <Style Selector="Border.examStatusPill.danger TextBlock">
+      <Setter Property="Foreground" Value="White"/>
+    </Style>
+    <Style Selector="Button.examRow">
+      <Setter Property="HorizontalAlignment" Value="Stretch"/>
+      <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
+      <Setter Property="Background" Value="{DynamicResource AppListRowBackgroundBrush}"/>
+      <Setter Property="BorderBrush" Value="{DynamicResource AppListRowBorderBrush}"/>
+      <Setter Property="BorderThickness" Value="1,0,1,1"/>
+      <Setter Property="Padding" Value="0"/>
+      <Setter Property="CornerRadius" Value="0"/>
+    </Style>
+    <Style Selector="Button.examRow:pointerover /template/ ContentPresenter">
+      <Setter Property="Background" Value="{DynamicResource AppListRowHoverBrush}"/>
+    </Style>
+    <Style Selector="Button.siblingPill">
+      <Setter Property="Padding" Value="10,4"/>
+      <Setter Property="FontSize" Value="12"/>
+      <Setter Property="CornerRadius" Value="12"/>
+    </Style>
+  </UserControl.Styles>
+
+  <Grid RowDefinitions="Auto,Auto,*">
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto">
+        <shared:PageHeader Grid.Column="0" Title="Klausuren"
+                            Subtitle="Alle Klausuren des Schuljahres, nach Dringlichkeit sortiert"/>
+        <Button Grid.Column="1" Content="↻  Aktualisieren" Command="{Binding LoadCommand}"
+                VerticalAlignment="Center"/>
+      </Grid>
+    </Border>
+
+    <!-- Detailbereich zur ausgewählten Klausur ─────────────────────────────────── -->
+    <Border Grid.Row="1" Margin="20,16,20,10" Padding="18"
+            Background="{DynamicResource AppCardBackgroundBrush}"
+            BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1" CornerRadius="10"
+            IsVisible="{Binding HasSelection}">
+      <StackPanel Spacing="12">
+        <Grid ColumnDefinitions="*,Auto">
+          <StackPanel Grid.Column="0" Spacing="2">
+            <TextBlock Text="{Binding SelectedRow.Title}" FontSize="16" FontWeight="SemiBold"/>
+            <TextBlock FontSize="13" Opacity="0.6">
+              <Run Text="{Binding SelectedRow.GroupLabel}"/>
+              <Run Text=" · "/>
+              <Run Text="{Binding SelectedRow.SubLabel}"/>
+            </TextBlock>
+          </StackPanel>
+          <Border Grid.Column="1" Classes="examStatusPill" VerticalAlignment="Top"
+                  Classes.ok="{Binding SelectedRow.IsOk}" Classes.info="{Binding SelectedRow.IsInfo}"
+                  Classes.warning="{Binding SelectedRow.IsWarning}" Classes.danger="{Binding SelectedRow.IsDanger}">
+            <TextBlock Text="{Binding SelectedRow.StatusLabel}"/>
+          </Border>
+        </Grid>
+
+        <!-- Parallelkurs-Umschalter -->
+        <ItemsControl ItemsSource="{Binding Siblings}" IsVisible="{Binding SelectedRow.HasSibling}">
+          <ItemsControl.ItemsPanel>
+            <ItemsPanelTemplate>
+              <StackPanel Orientation="Horizontal" Spacing="8"/>
+            </ItemsPanelTemplate>
+          </ItemsControl.ItemsPanel>
+          <ItemsControl.ItemTemplate>
+            <DataTemplate x:DataType="vm:ExamListRowViewModel">
+              <Button Classes="siblingPill"
+                      Command="{Binding $parent[ItemsControl].((vm:ExamsOverviewViewModel)DataContext).SelectExamCommand}"
+                      CommandParameter="{Binding}">
+                <TextBlock>
+                  <Run Text="{Binding GroupLabel}"/>
+                  <Run Text=" · "/>
+                  <Run Text="{Binding Evaluated}"/>
+                  <Run Text="/"/>
+                  <Run Text="{Binding Expected}"/>
+                </TextBlock>
+              </Button>
+            </DataTemplate>
+          </ItemsControl.ItemTemplate>
+        </ItemsControl>
+
+        <!-- Korrekturfortschritt -->
+        <StackPanel Spacing="6" IsVisible="{Binding ShowCorrectionProgress}">
+          <TextBlock Text="{Binding ProgressLabel}" FontSize="13"/>
+          <Border Width="240" Height="6" CornerRadius="3" HorizontalAlignment="Left"
+                  Background="{DynamicResource AppTrackBackgroundBrush}">
+            <Border Width="{Binding ProgressBarWidth}" Height="6" CornerRadius="3"
+                    HorizontalAlignment="Left" Background="{DynamicResource AppStatusWarningBrush}"/>
+          </Border>
+        </StackPanel>
+
+        <!-- Notenspiegel -->
+        <StackPanel Spacing="6" IsVisible="{Binding ShowGradeSummary}">
+          <TextBlock Text="{Binding AverageLabel}" FontSize="14" FontWeight="SemiBold"/>
+          <ItemsControl ItemsSource="{Binding DetailGradeDistribution}">
+            <ItemsControl.ItemTemplate>
+              <DataTemplate x:DataType="vmg:GradeBarItem">
+                <Grid ColumnDefinitions="30,*,60" Margin="0,1">
+                  <TextBlock Grid.Column="0" Text="{Binding Grade}" FontSize="12" VerticalAlignment="Center"/>
+                  <Border Grid.Column="1" Height="14" Width="{Binding BarWidth}" HorizontalAlignment="Left"
+                          Background="{DynamicResource AppAccentTextBrush}" CornerRadius="3"/>
+                  <TextBlock Grid.Column="2" Text="{Binding CountDisplay}" FontSize="11" Opacity="0.6"
+                             VerticalAlignment="Center"/>
+                </Grid>
+              </DataTemplate>
+            </ItemsControl.ItemTemplate>
+          </ItemsControl>
+        </StackPanel>
+
+        <!-- Genehmigung / Ankündigung -->
+        <StackPanel Orientation="Horizontal" Spacing="10">
+          <Button Content="{Binding ApprovalLabel}" Command="{Binding ToggleApprovalCommand}" FontSize="12"/>
+          <Button Content="{Binding AnnouncementLabel}" Command="{Binding ToggleAnnouncementCommand}" FontSize="12"/>
+        </StackPanel>
+
+        <StackPanel Orientation="Horizontal" Spacing="8">
+          <Button Content="Punkte eingeben" Command="{Binding GradeSelectedCommand}"
+                  IsVisible="{Binding ShowCorrectionProgress}"/>
+          <Button Content="Auswertung" Command="{Binding EvaluateSelectedCommand}"
+                  IsVisible="{Binding ShowGradeSummary}"/>
+          <Button Content="Zum Kurs →" Command="{Binding GoToGroupCommand}" HorizontalAlignment="Right"/>
+        </StackPanel>
+      </StackPanel>
+    </Border>
+
+    <!-- Liste aller Klausuren, nach Priorität sortiert (nicht nach Datum) ─────────── -->
+    <ScrollViewer Grid.Row="2" Margin="20,0,20,16">
+      <StackPanel>
+        <TextBlock Text="{Binding EmptyHint}" Classes="emptyhint" Margin="0,20,0,0"
+                    IsVisible="{Binding EmptyHint, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+        <ItemsControl ItemsSource="{Binding Rows}">
+          <ItemsControl.ItemTemplate>
+            <DataTemplate x:DataType="vm:ExamListRowViewModel">
+              <Button Classes="examRow"
+                      Command="{Binding $parent[ItemsControl].((vm:ExamsOverviewViewModel)DataContext).SelectExamCommand}"
+                      CommandParameter="{Binding}">
+                <Grid ColumnDefinitions="4,*,Auto,Auto" MinHeight="52">
+                  <Border Grid.Column="0" Classes="examStatusBar" Classes.ok="{Binding IsOk}"
+                          Classes.info="{Binding IsInfo}" Classes.warning="{Binding IsWarning}"
+                          Classes.danger="{Binding IsDanger}"/>
+                  <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="12,6" Spacing="2">
+                    <StackPanel Orientation="Horizontal" Spacing="6">
+                      <TextBlock Text="{Binding Title}" FontSize="14" FontWeight="Medium"/>
+                      <TextBlock Text="🔗" FontSize="11" Opacity="0.5" IsVisible="{Binding HasSibling}"
+                                 ToolTip.Tip="Parallelkurs vorhanden"/>
+                    </StackPanel>
+                    <TextBlock FontSize="12" Opacity="0.6">
+                      <Run Text="{Binding GroupLabel}"/>
+                      <Run Text=" · "/>
+                      <Run Text="{Binding SubLabel}"/>
+                    </TextBlock>
+                  </StackPanel>
+                  <Border Grid.Column="3" Classes="examStatusPill" VerticalAlignment="Center" Margin="0,0,12,0"
+                          Classes.ok="{Binding IsOk}" Classes.info="{Binding IsInfo}"
+                          Classes.warning="{Binding IsWarning}" Classes.danger="{Binding IsDanger}">
+                    <TextBlock Text="{Binding StatusLabel}"/>
+                  </Border>
+                </Grid>
+              </Button>
+            </DataTemplate>
+          </ItemsControl.ItemTemplate>
+        </ItemsControl>
+      </StackPanel>
+    </ScrollViewer>
+  </Grid>
+</UserControl>

LehrerApp.Desktop/Views/Exams/ExamsOverviewView.axaml.cs

@@ -0,0 +1,63 @@
+using Avalonia.Controls;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using LehrerApp.Desktop.ViewModels;
+using LehrerApp.Desktop.ViewModels.Exams;
+using LehrerApp.Desktop.ViewModels.Groups;
+using LehrerApp.Desktop.Views.Groups;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace LehrerApp.Desktop.Views.Exams;
+
+public partial class ExamsOverviewView : UserControl
+{
+    private const int GroupDetailKlausurenTabIndex = 4;
+
+    public ExamsOverviewView() => InitializeComponent();
+
+    protected override void OnDataContextChanged(EventArgs e)
+    {
+        base.OnDataContextChanged(e);
+        if (DataContext is ExamsOverviewViewModel vm)
+        {
+            vm.OnGradeExam = ShowGradeExamDialog;
+            vm.OnEvaluateExam = ShowEvaluateExamDialog;
+            vm.OnNavigateToGroup = groupId => App.Services.GetRequiredService<MainWindowViewModel>()
+                .NavigateToGroupDetail(groupId, GroupDetailKlausurenTabIndex);
+        }
+    }
+
+    private async Task ShowGradeExamDialog(Exam exam)
+    {
+        var group = App.Services.GetRequiredService<IGroupRepository>().GetById(exam.GroupId);
+        if (group is null) return;
+
+        var dialogVm = new ExamGradingDialogViewModel(
+            App.Services.GetRequiredService<IExamResultRepository>(),
+            App.Services.GetRequiredService<IStudentRepository>(),
+            App.Services.GetRequiredService<IGroupMembershipRepository>(),
+            App.Services.GetRequiredService<GradingService>(),
+            exam, group.Id);
+
+        var dialog = new ExamGradingDialog { DataContext = dialogVm };
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is not null) await dialog.ShowDialog(owner);
+    }
+
+    private async Task ShowEvaluateExamDialog(Exam exam)
+    {
+        var group = App.Services.GetRequiredService<IGroupRepository>().GetById(exam.GroupId);
+        if (group is null) return;
+
+        var dialogVm = new ExamEvaluationDialogViewModel(
+            App.Services.GetRequiredService<IExamRepository>(),
+            App.Services.GetRequiredService<IExamResultRepository>(),
+            App.Services.GetRequiredService<GradingService>(),
+            exam, group.GradingSystem);
+
+        var dialog = new ExamEvaluationDialog { DataContext = dialogVm };
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is not null) await dialog.ShowDialog(owner);
+    }
+}

LehrerApp.Desktop/Views/Groups/ExamGradingDialog.axaml

@@ -15,6 +15,9 @@
               IsVisible="{Binding NiveauLabel, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
         <TextBlock Text="{Binding NiveauLabel}" FontSize="12" Foreground="White"/>
       </Border>
+      <Button Content="Rest als abwesend markieren" Command="{Binding MarkRemainingAbsentCommand}"
+              Margin="20,0,0,0" VerticalAlignment="Center"
+              ToolTip.Tip="Setzt bei allen noch leeren Zeilen 'Abwesend' — für Schüler, die nicht nachschreiben."/>
     </StackPanel>
 
     <DataGrid Grid.Row="1" Name="ResultGrid"

LehrerApp.Desktop/Views/MainWindow.axaml

@@ -15,6 +15,8 @@
         xmlns:vmw="clr-namespace:LehrerApp.Desktop.ViewModels.Workload"
         xmlns:vct="clr-namespace:LehrerApp.Desktop.Views.ClassTeacher"
         xmlns:vmct="clr-namespace:LehrerApp.Desktop.ViewModels.ClassTeacher"
+        xmlns:vex="clr-namespace:LehrerApp.Desktop.Views.Exams"
+        xmlns:vmex="clr-namespace:LehrerApp.Desktop.ViewModels.Exams"
         xmlns:svc="clr-namespace:LehrerApp.Desktop.Services"
         x:Class="LehrerApp.Desktop.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
@@ -63,6 +65,9 @@
       <DataTemplate DataType="vmct:ClassTeacherOverviewViewModel">
         <vct:ClassTeacherOverviewView/>
       </DataTemplate>
+      <DataTemplate DataType="vmex:ExamsOverviewViewModel">
+        <vex:ExamsOverviewView/>
+      </DataTemplate>
       <DataTemplate DataType="vm:PlaceholderViewModel">
         <views:PlaceholderView/>
       </DataTemplate>

LehrerApp.Tests/ExamPriorityServiceTests.cs

@@ -0,0 +1,102 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using Xunit;
+
+namespace LehrerApp.Tests;
+
+public class ExamPriorityServiceTests
+{
+    private static Exam MakeExam(ExamStatus status, DateOnly date) => new()
+    {
+        GroupId = Guid.NewGuid(), Title = "Klausur", Status = status, Date = date,
+    };
+
+    [Fact]
+    public void Evaluate_UnbearbeiteteKorrekturSteigtMitAlter()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var exam = MakeExam(ExamStatus.Conducted, today.AddDays(-10));
+
+        var result = ExamPriorityService.Evaluate(exam, expected: 20, evaluated: 0, today);
+
+        Assert.Equal(ExamListStatus.AwaitingCorrection, result.Status);
+    }
+
+    [Fact]
+    public void Evaluate_UnbearbeiteteKorrekturIstDringenderAlsLaufendeKorrektur()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var untouched = MakeExam(ExamStatus.Conducted, today.AddDays(-10));
+        var inProgress = MakeExam(ExamStatus.Conducted, today.AddDays(-10));
+
+        var untouchedResult = ExamPriorityService.Evaluate(untouched, expected: 20, evaluated: 0, today);
+        var progressResult  = ExamPriorityService.Evaluate(inProgress, expected: 20, evaluated: 10, today);
+
+        Assert.True(untouchedResult.Score > progressResult.Score);
+    }
+
+    [Fact]
+    public void Evaluate_LaufendeKorrekturIstDringenderAlsGeplanteKlausur()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var inProgress = MakeExam(ExamStatus.Conducted, today.AddDays(-2));
+        var planned     = MakeExam(ExamStatus.Planned, today.AddDays(1));
+
+        var progressResult = ExamPriorityService.Evaluate(inProgress, expected: 20, evaluated: 10, today);
+        var plannedResult  = ExamPriorityService.Evaluate(planned, expected: 20, evaluated: 0, today);
+
+        Assert.True(progressResult.Score > plannedResult.Score);
+    }
+
+    [Fact]
+    public void Evaluate_HängengebliebeneKorrekturFälltAusDerDringlichenZone()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var stuck = MakeExam(ExamStatus.Conducted, today.AddDays(-(ExamPriorityService.StuckAfterDays + 5)));
+        var fresh = MakeExam(ExamStatus.Conducted, today.AddDays(-2));
+
+        // Ein einzelner nie nachschreibender Schüler: 19 von 20 erledigt, seit Wochen unverändert.
+        var stuckResult = ExamPriorityService.Evaluate(stuck, expected: 20, evaluated: 19, today);
+        var freshResult = ExamPriorityService.Evaluate(fresh, expected: 20, evaluated: 10, today);
+
+        Assert.Equal(ExamListStatus.CorrectionStuck, stuckResult.Status);
+        Assert.True(stuckResult.Score < freshResult.Score);
+    }
+
+    [Fact]
+    public void Evaluate_VollständigBewertetGiltAlsBereitZurRückgabe()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var exam = MakeExam(ExamStatus.Conducted, today.AddDays(-5));
+
+        var result = ExamPriorityService.Evaluate(exam, expected: 20, evaluated: 20, today);
+
+        Assert.Equal(ExamListStatus.AwaitingReturn, result.Status);
+    }
+
+    [Fact]
+    public void Evaluate_ZurückgegebenIstAmWenigstenDringlich()
+    {
+        var today = new DateOnly(2026, 8, 29);
+        var returned = MakeExam(ExamStatus.Returned, today.AddDays(-30));
+        var planned   = MakeExam(ExamStatus.Planned, today.AddDays(60));
+
+        var returnedResult = ExamPriorityService.Evaluate(returned, expected: 20, evaluated: 20, today);
+        var plannedResult  = ExamPriorityService.Evaluate(planned, expected: 20, evaluated: 0, today);
+
+        Assert.True(returnedResult.Score < plannedResult.Score);
+    }
+
+    [Fact]
+    public void Count_AbwesenderSchülerGiltAlsErledigt()
+    {
+        var exam = MakeExam(ExamStatus.Conducted, new DateOnly(2026, 8, 20));
+        var membership = new GroupMembership { GroupId = exam.GroupId, StudentId = Guid.NewGuid() };
+        var results = new List<ExamResult> { new() { ExamId = exam.Id, StudentId = membership.StudentId, Absent = true } };
+
+        var (expected, evaluated) = ExamCorrectionCounter.Count(exam, [membership], results);
+
+        Assert.Equal(1, expected);
+        Assert.Equal(1, evaluated);
+    }
+}

TODO.md

@@ -96,6 +96,48 @@ pragmatisch über "Abwesend" bei den übrigen Schülern statt über eine eigene
 - [x] **1.5.4** Export der Auswertung — CSV-Export direkt im Dialog; inzwischen auf die gemeinsame
       Export-Infrastruktur aus 11.1 und den zentralen `CsvBuilder` umgestellt.
 
+### 1.6 Klausuren-Hauptseite (gruppenübergreifend)
+
+Der Sidebar-Punkt "Klausuren" (`NavItem.Exams`) war bisher ein `PlaceholderViewModel` ohne
+Funktion — die vollständige Verwaltung existierte nur innerhalb einer Gruppe (1.1–1.5). Nutzer
+unterrichten oft mehrere Kurse gleichzeitig und brauchen einen gruppenübergreifenden Überblick.
+
+- [x] **1.6.1** Neue Seite `ExamsOverviewViewModel`/`ExamsOverviewView` ersetzt den Placeholder.
+      Detailbereich zur ausgewählten Klausur oben (ca. 55–60 % Höhe), darunter eine scrollbare
+      Liste aller Klausuren des aktuellen Schuljahres — bewusst kein separates Menü, sondern
+      Bestandteil derselben Seite (Nutzerwunsch: "keine eigene Hauptseite in dem Ausmaß").
+- [x] **1.6.2** Sortierung nach unsichtbarem Prioritäts-Score statt nach Datum — neuer Service
+      `ExamPriorityService` (`LehrerApp.Core/Services/ExamPriorityService.cs`) leitet Status
+      (`ExamListStatus`: Planned/AwaitingCorrection/CorrectionInProgress/CorrectionStuck/
+      AwaitingReturn/Returned) und Score aus dem vorhandenen `Exam.Status` plus dem
+      Korrekturfortschritt ab — kein neuer, manuell zu pflegender "Korrektur läuft"-Status.
+      Der Korrekturfortschritt selbst kommt aus `ExamCorrectionCounter` (ebenda), das auch
+      `DashboardViewModel.LoadOpenCorrections` jetzt nutzt (vorher zwei Kopien derselben Zählung).
+      Farbcodierung wiederverwendet die validierten `AppStatus{Ok,Info,Warning,Danger}Brush`
+      aus `Styles/SemanticBrushes.axaml` (Klassenlehrer-Bereich) statt neuer Hex-Werte.
+- [x] **1.6.3** Nutzer-Feedback zum "hängt fest"-Fall: ein einzelner Schüler, der nie
+      nachschreibt, blockierte sonst dauerhaft die live abgeleitete Korrektur-Erkennung, weil
+      niemand eine leere Zeile anfasst, für die es nichts einzutragen gibt. Zwei Bausteine statt
+      eines manuellen Override: (a) neuer Button "Rest als abwesend markieren" im
+      `ExamGradingDialog` setzt bei allen noch unberührten Zeilen "Abwesend" in einem Klick;
+      (b) bleibt eine Klausur trotzdem länger als `ExamPriorityService.StuckAfterDays` (21 Tage)
+      in Bearbeitung hängen, fällt sie aus der dringenden Zone in eine ruhige
+      `CorrectionStuck`-Einstufung statt dauerhaft oben zu kleben.
+- [x] **1.6.4** Parallelkurse (gleiche Arbeit, mehrere Kurse — z.B. zwei Chemie-Kurse im selben
+      Jahrgang): neues optionales Feld `Exam.SharedExamGroupId`, beim Duplizieren (1.1.4) auf die
+      Id der Ursprungsklausur gesetzt. Die Klausuren-Hauptseite zeigt dafür einen Kurs-Umschalter
+      im Detailbereich; Zeilen mit Verknüpfung tragen ein 🔗-Symbol in der Liste.
+- [x] **1.6.5** Zwei neue nullable Datumsfelder `Exam.ApprovalGrantedAt`/`AnnouncedAt`
+      ("Genehmigung erteilt"/"Ankündigung bei Schülern gemacht", Label verhandelbar) — bewusst
+      keine weiteren Workflow-Statusstufen, weil sie zeitlich oft parallel statt sequenziell zum
+      Hauptstatus laufen. Als anklickbare Zeilen im Detailbereich, die das Datum auf heute setzen
+      bzw. wieder löschen.
+- [x] **1.6.6** Detailbereich zeigt je nach Status Korrekturfortschritt (Balken + Zahl) oder
+      Notenspiegel (Balken je Note + Durchschnitt, gleiche Berechnung wie 1.5.1 über
+      `GradingService`/`GradeBarItem`) — kein Kompetenz-Breakdown in dieser Iteration. Button
+      "Zum Kurs" springt in den Klausuren-Tab der jeweiligen Gruppe (dort wie gehabt Zugriff auf
+      Kompetenzen-Tab, 8.2/8.3).
+
 ---
 
 ## 2. Noten & Zeugnisnoten