Notenverwaltung (Kapitel 2) und Mitarbeits-Assistent

Notenübersicht der Gruppe (Matrix, Gesamt-Spalte, Sortierung, Halbjahresfilter),
Einzelnoten-Pflege samt Sammelerfassung, Gewichtungsschema mit Voreinstellung je
Gruppentyp, Zeugnisnoten-Berechnung mit Übersteuern/Festschreiben/Export und
Notenentwicklung im Schülerdetail.

Dazu Anwesenheits-/Hausaufgaben-Tracking je Mitarbeit-Sitzung, ein neuer
Mitarbeits-Assistent (Zeitleiste mit Abschnitten, automatischer Notenvorschlag,
Zusammenzug zur Halbjahresnote) und eine Dashboard-Kachel für offene
Entschuldigungen. Außerdem: verbliebene englische Begriffe in Auswahlfeldern
und Buttons auf Deutsch umgestellt.

LehrerApp.Desktop/ViewModels/Groups/ParticipationViewModels.cs

@@ -28,6 +28,7 @@ public partial class ParticipationTabViewModel : ObservableObject
     public Guid GroupId => _groupId;
     public string SchoolYear => _schoolYear;
     public GradingSystem GradingSystem => _gradingSystem;
+    public string GroupLabel { get; private set; } = "";
 
     [ObservableProperty] private ParticipationSessionItem? _selectedSession;
     [ObservableProperty] private string _noDataText = "Keine Bewertungssitzung ausgewählt.";
@@ -47,6 +48,7 @@ public partial class ParticipationTabViewModel : ObservableObject
     public Func<Task<ParticipationSession?>>? OnAddSession   { get; set; }
     public Func<ParticipationTabViewModel, Task>? OnQuickInput { get; set; }
     public Func<ParticipationTabViewModel, Task>? OnComputeGrade { get; set; }
+    public Func<ParticipationTabViewModel, Task>? OnOpenWizard { get; set; }
 
     public ParticipationTabViewModel(
         IParticipationSessionRepository sessions,
@@ -72,6 +74,7 @@ public partial class ParticipationTabViewModel : ObservableObject
         _subjectId  = group?.SubjectId;
         _gradeLevel = group?.GradeLevel ?? 0;
         _gradingSystem = group?.GradingSystem ?? GradingSystem.Grades1To6;
+        GroupLabel = group?.Name ?? "";
 
         HasCompetencyCatalog = _subjectId.HasValue
             && _competencyDomains.GetBySubjectAndGrade(_subjectId.Value, _gradeLevel).Count > 0;
@@ -143,6 +146,8 @@ public partial class ParticipationTabViewModel : ObservableObject
             var row = new ParticipationStudentRow(s.Id, s.FullName, entry, Aspects.ToList(), ActiveCompetencyCodes);
             row.OnRatingChanged           = (sid, key, val)  => SaveRating(sessionId, sid, key, val);
             row.OnCompetencyRatingChanged = (sid, code, val) => SaveCompetencyRating(sessionId, sid, code, val);
+            row.HomeworkChangedCallback         = (sid, val) => SaveHomework(sessionId, sid, val);
+            row.AttendanceChangedCallback       = (sid, val) => SaveAttendance(sessionId, sid, val);
             StudentRows.Add(row);
         }
         QuickInputCommand.NotifyCanExecuteChanged();
@@ -185,6 +190,22 @@ public partial class ParticipationTabViewModel : ObservableObject
         if (SelectedSession is not null) LoadGrid(SelectedSession.Id);
     }
 
+    private void SaveHomework(Guid sessionId, Guid studentId, bool value)
+    {
+        var entry = _entries.GetBySessionAndStudent(sessionId, studentId)
+                    ?? new ParticipationEntry { SessionId = sessionId, StudentId = studentId };
+        entry.HomeworkMissing = value;
+        _entries.Save(entry);
+    }
+
+    private void SaveAttendance(Guid sessionId, Guid studentId, AttendanceStatus? value)
+    {
+        var entry = _entries.GetBySessionAndStudent(sessionId, studentId)
+                    ?? new ParticipationEntry { SessionId = sessionId, StudentId = studentId };
+        entry.Attendance = value;
+        _entries.Save(entry);
+    }
+
     [RelayCommand]
     private void ToggleCompetencyTags() => CompetencyTagsVisible = !CompetencyTagsVisible;
 
@@ -259,6 +280,13 @@ public partial class ParticipationTabViewModel : ObservableObject
         await OnComputeGrade(this);
     }
 
+    [RelayCommand]
+    private async Task OpenWizard()
+    {
+        if (OnOpenWizard is null) return;
+        await OnOpenWizard(this);
+    }
+
     [RelayCommand]
     private void DeleteSession()
     {
@@ -310,8 +338,16 @@ public partial class ParticipationStudentRow : ObservableObject
     public ObservableCollection<RatingCell> Cells            { get; } = [];
     public ObservableCollection<RatingCell> CompetencyCells  { get; } = [];
 
+    [ObservableProperty] private bool _homeworkMissing;
+    [ObservableProperty] private AttendanceStatus? _attendance;
+
+    public string AttendanceLabel => AttendanceDisplay.ShortLabel(Attendance);
+    public string AttendanceTooltip => AttendanceDisplay.Label(Attendance);
+
     public Action<Guid, string, int?>? OnRatingChanged           { get; set; }
     public Action<Guid, string, int?>? OnCompetencyRatingChanged { get; set; }
+    public Action<Guid, bool>?             HomeworkChangedCallback   { get; set; }
+    public Action<Guid, AttendanceStatus?>? AttendanceChangedCallback { get; set; }
 
     public ParticipationStudentRow(Guid id, string name, ParticipationEntry entry,
         List<AspectColumnDef> aspects, List<string> competencyCodes)
@@ -320,6 +356,8 @@ public partial class ParticipationStudentRow : ObservableObject
         Name        = name;
         _entry      = entry;
         _aspectDefs = aspects;
+        _homeworkMissing = entry.HomeworkMissing;
+        _attendance       = entry.Attendance;
 
         foreach (var a in aspects)
         {
@@ -347,6 +385,61 @@ public partial class ParticipationStudentRow : ObservableObject
         cell?.SetValue(value);
         OnRatingChanged?.Invoke(StudentId, key, value);
     }
+
+    [RelayCommand]
+    private void ToggleHomework()
+    {
+        HomeworkMissing = !HomeworkMissing;
+        HomeworkChangedCallback?.Invoke(StudentId, HomeworkMissing);
+    }
+
+    [RelayCommand]
+    private void CycleAttendance()
+    {
+        Attendance = Attendance switch
+        {
+            null                            => AttendanceStatus.ExcusePending,
+            AttendanceStatus.ExcusePending  => AttendanceStatus.Excused,
+            AttendanceStatus.Excused        => AttendanceStatus.Unexcused,
+            AttendanceStatus.Unexcused      => null,
+            _                                => null,
+        };
+        OnPropertyChanged(nameof(AttendanceLabel));
+        OnPropertyChanged(nameof(AttendanceTooltip));
+        AttendanceChangedCallback?.Invoke(StudentId, Attendance);
+    }
+
+    // Direktes Setzen (z.B. aus dem Grading-Wizard heraus), ohne den Zyklus zu durchlaufen.
+    public void SetAttendance(AttendanceStatus? value)
+    {
+        Attendance = value;
+        OnPropertyChanged(nameof(AttendanceLabel));
+        OnPropertyChanged(nameof(AttendanceTooltip));
+        AttendanceChangedCallback?.Invoke(StudentId, value);
+    }
+}
+
+// ── Anwesenheits-Anzeige ──────────────────────────────────────────────────────
+
+public static class AttendanceDisplay
+{
+    public static string Label(AttendanceStatus? s) => s switch
+    {
+        null                            => "Anwesend",
+        AttendanceStatus.ExcusePending  => "Krank (Entschuldigung offen)",
+        AttendanceStatus.Excused        => "Krank, entschuldigt",
+        AttendanceStatus.Unexcused      => "Krank, unentschuldigt",
+        _                                => "Anwesend",
+    };
+
+    public static string ShortLabel(AttendanceStatus? s) => s switch
+    {
+        null                            => "",
+        AttendanceStatus.ExcusePending  => "K ?",
+        AttendanceStatus.Excused        => "K ✓",
+        AttendanceStatus.Unexcused      => "K ✗",
+        _                                => "",
+    };
 }
 
 // ── Eine Bewertungszelle ──────────────────────────────────────────────────────