custom login implementation, period-based timetable layout with overlap handling, enhanced error dialogs, and unified bottom sheets

lib/view/pages/timetable/data/calendar_layout.dart

@@ -6,3 +6,11 @@ const double kCalendarViewHeaderHeight = 60;
 /// Minimum pixels per hour. Below this, the grid scrolls vertically rather
 /// than compressing further.
 const double kCalendarMinPxPerHour = 56;
+
+/// Minimum height of a lesson block in the period-based layout. The grid
+/// scrolls vertically once lessons would otherwise be smaller than this.
+const double kLessonBlockMinHeight = 50;
+
+/// Fixed height of a break block in the period-based layout. Independent of
+/// the actual break duration; breaks are rendered as a compact indicator.
+const double kBreakBlockHeight = 28;

lib/view/pages/timetable/data/timetable_appointment_factory.dart

@@ -72,8 +72,8 @@ class TimetableAppointmentFactory {
         id: CustomAppointment(event),
         startTime: event.startDate,
         endTime: event.endDate,
-        location: event.description,
-        subject: event.title,
+        location: _collapseWhitespace(event.description),
+        subject: _collapseWhitespace(event.title) ?? event.title,
         recurrenceRule: event.rrule,
         color: TimetableColors.getColorFromString(event.color ?? TimetableColors.defaultColor.name),
         startTimeZone: '',
@@ -83,19 +83,38 @@ class TimetableAppointmentFactory {
   String _subjectName(GetTimetableResponseObject lesson) {
     final subject = subjects.result.firstWhereOrNull((s) => s.id == lesson.su.firstOrNull?.id);
     if (subject == null) return 'Unbekannt';
-    return switch (settings.timetableNameMode) {
+    final name = switch (settings.timetableNameMode) {
       TimetableNameMode.name => subject.name,
       TimetableNameMode.longName => subject.longName,
       TimetableNameMode.alternateName => subject.alternateName,
     };
+    return _collapseWhitespace(name) ?? 'Unbekannt';
   }
 
   String _locationLabel(GetTimetableResponseObject lesson) {
-    final roomName = rooms.result.firstWhereOrNull((r) => r.id == lesson.ro.firstOrNull?.id)?.name ?? 'Unbekannt';
-    final teacherName = lesson.te.firstOrNull?.longname ?? 'Unbekannt';
+    final roomName = _collapseWhitespace(
+        rooms.result.firstWhereOrNull((r) => r.id == lesson.ro.firstOrNull?.id)?.name) ??
+        'Unbekannt';
+    final teacherName = _collapseWhitespace(lesson.te.firstOrNull?.longname) ?? 'Unbekannt';
     return '$roomName\n$teacherName';
   }
 
+  /// Collapses any line-break or whitespace run to a single space and trims.
+  /// Returns null when input is null or fully whitespace. Webuntis sometimes
+  /// returns multi-line room names like "A30\n4" — this normalizes those so
+  /// the tile renders the room on a single line.
+  static String? _collapseWhitespace(String? s) {
+    if (s == null) return null;
+    final cleaned = s
+        .replaceAll('\r\n', ' ')
+        .replaceAll('\n', ' ')
+        .replaceAll('\r', ' ')
+        .replaceAll('\t', ' ')
+        .replaceAll(RegExp(r'\s+'), ' ')
+        .trim();
+    return cleaned.isEmpty ? null : cleaned;
+  }
+
   // Pure: returns a new list, does not mutate input.
   static List<GetTimetableResponseObject> _mergeAdjacentLessons(
     List<GetTimetableResponseObject> input, {