Stundenplan: Wochenraster, Wochennavigation, Ferien/Feiertage (Kapitel 4.3)

Neuer Stundenplan mit "Heute"-Standardansicht (Tagesliste unten angedockt,
gruppenübergreifendes Wochenraster mit Fach/Klasse/Raum/Thema, Vor-/Zurück-
Navigation zwischen Kalenderwochen) und separatem Bearbeiten-Raster für die
wöchentliche Zuordnung. Badges für Ferien-/Klausur-Nähe und ausgegraute
Ferientage direkt im Plan statt einer separaten Liste. Ferien-/Feiertage-
Pflege (Bundesland, Schulferien) sitzt jetzt in den Einstellungen statt im
Stundenplan selbst.

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

LehrerApp.Data/LiteDbContext.cs

@@ -57,6 +57,8 @@ public class LiteDbContext : IDisposable
     public ILiteCollection<CompetencyDomain>     CompetencyDomains     => _db.GetCollection<CompetencyDomain>("competency_domains");
     public ILiteCollection<ShorthandCode>        ShorthandCodes        => _db.GetCollection<ShorthandCode>("shorthand_codes");
     public ILiteCollection<AlternativeLessonPath> AlternativeLessonPaths => _db.GetCollection<AlternativeLessonPath>("alternative_lesson_paths");
+    public ILiteCollection<TimetableSlot>  TimetableSlots  => _db.GetCollection<TimetableSlot>("timetable_slots");
+    public ILiteCollection<SchoolHoliday>  SchoolHolidays  => _db.GetCollection<SchoolHoliday>("school_holidays");
 
     public void Checkpoint() => _db.Checkpoint();
 
@@ -369,6 +371,9 @@ public class LiteDbContext : IDisposable
         CompetencyDomains.EnsureIndex(x => x.GradeLevel);
         ShorthandCodes.EnsureIndex("ux_shorthand_code", BsonExpression.Create("LOWER(TRIM($.Code))"), unique: true);
         AlternativeLessonPaths.EnsureIndex("ux_alt_lesson_path_name", BsonExpression.Create("LOWER(TRIM($.Name))"), unique: true);
+        TimetableSlots.EnsureIndex(x => x.GroupId);
+        TimetableSlots.EnsureIndex("ux_timetable_weekday_period",
+            BsonExpression.Create("STRING($.Weekday) + ':' + STRING($.PeriodNumber)"), unique: true);
     }
 
     public void Dispose() => _db.Dispose();

LehrerApp.Data/Repositories/AllRepositories.cs

@@ -386,6 +386,30 @@ public class AlternativeLessonPathRepository(LiteDbContext db) : IAlternativeLes
     public void Delete(Guid id) => db.AlternativeLessonPaths.Delete(id);
 }
 
+public class TimetableSlotRepository(LiteDbContext db) : ITimetableSlotRepository
+{
+    public List<TimetableSlot> GetAll() =>
+        db.TimetableSlots.FindAll().OrderBy(s => s.Weekday).ThenBy(s => s.PeriodNumber).ToList();
+    public List<TimetableSlot> GetByGroup(Guid groupId) =>
+        db.TimetableSlots.Find(s => s.GroupId == groupId).OrderBy(s => s.Weekday).ThenBy(s => s.PeriodNumber).ToList();
+    public void Save(TimetableSlot slot)
+    {
+        var occupied = db.TimetableSlots.FindAll()
+            .FirstOrDefault(s => s.Weekday == slot.Weekday && s.PeriodNumber == slot.PeriodNumber);
+        if (occupied is not null && occupied.Id != slot.Id)
+            throw new InvalidOperationException("Diese Stunde ist bereits belegt.");
+        db.TimetableSlots.Upsert(slot);
+    }
+    public void Delete(Guid id) => db.TimetableSlots.Delete(id);
+}
+
+public class SchoolHolidayRepository(LiteDbContext db) : ISchoolHolidayRepository
+{
+    public List<SchoolHoliday> GetAll() => db.SchoolHolidays.FindAll().OrderBy(h => h.StartDate).ToList();
+    public void Save(SchoolHoliday holiday) => db.SchoolHolidays.Upsert(holiday);
+    public void Delete(Guid id) => db.SchoolHolidays.Delete(id);
+}
+
 public class CompetencyDomainRepository(LiteDbContext db) : ICompetencyDomainRepository
 {
     public List<CompetencyDomain> GetBySubjectAndGrade(Guid subjectId, int gradeLevel) =>