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

lib/view/pages/timetable/details/webuntis_lesson_sheet.dart

@@ -23,29 +23,24 @@ class WebuntisLessonSheet {
     final headerTitle = _firstNonEmpty([headerSubject.alternateName, headerSubject.name, headerSubject.longName, '?']);
     final headerLongName = headerSubject.longName.isNotEmpty && headerSubject.longName != headerTitle ? headerSubject.longName : '';
 
+    final timeRange =
+        '${Jiffy.parseFromDateTime(appointment.startTime).format(pattern: 'HH:mm')} - '
+        '${Jiffy.parseFromDateTime(appointment.endTime).format(pattern: 'HH:mm')}';
+
     showAppointmentBottomSheet(
       context,
-      header: (_) => Center(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Text(
-              '${_codePrefix(lesson.code)}$headerTitle',
-              textAlign: TextAlign.center,
-              style: const TextStyle(fontSize: 25),
-              overflow: TextOverflow.ellipsis,
-            ),
-            if (headerLongName.isNotEmpty) Text(headerLongName),
-            Text(
-              '${Jiffy.parseFromDateTime(appointment.startTime).format(pattern: 'HH:mm')} - '
-              '${Jiffy.parseFromDateTime(appointment.endTime).format(pattern: 'HH:mm')}',
-              style: const TextStyle(fontSize: 15),
-            ),
-          ],
+      header: ListTile(
+        leading: Icon(_iconForCode(lesson.code), size: 32),
+        title: Text(
+          '${_codePrefix(lesson.code)}$headerTitle',
+          style: const TextStyle(fontWeight: FontWeight.bold),
         ),
+        subtitle: Text(headerLongName.isNotEmpty
+            ? '$timeRange\n$headerLongName'
+            : timeRange),
+        isThreeLine: headerLongName.isNotEmpty,
       ),
-      body: (_) => SliverChildListDelegate(<Widget>[
-        const Divider(),
+      children: (_) => <Widget>[
         ListTile(
           leading: const Icon(Icons.notifications_active),
           title: Text('Status: ${_statusLabel(lesson.code)}'),
@@ -82,10 +77,21 @@ class WebuntisLessonSheet {
           ),
         ..._optionalTextTiles(lesson),
         DebugTile(context).jsonData(lesson.toJson()),
-      ]),
+      ],
     );
   }
 
+  static IconData _iconForCode(String? code) {
+    switch (code) {
+      case 'cancelled':
+        return Icons.event_busy_outlined;
+      case 'irregular':
+        return Icons.swap_horiz;
+      default:
+        return Icons.school_outlined;
+    }
+  }
+
   static Widget _roomTile(BuildContext context, TimetableState state, GetTimetableResponseObject lesson) {
     final trailing = IconButton(
       icon: const Icon(Icons.house_outlined),
@@ -193,7 +199,7 @@ class WebuntisLessonSheet {
 
   static Widget? _textTile(IconData icon, String label, String? value) {
     final text = (value ?? '').trim();
-    if (text.isEmpty) return null;
+    if (text.isEmpty || text == '-') return null;
     return ListTile(
       leading: Icon(icon),
       title: Text(label),