optimized avatar and linkify performance, refined navigation to preserve popups, implemented read marker caching, and added file size limits for saving, minor timetable details changes

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

@@ -1,4 +1,3 @@
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_calendar/calendar.dart';
 
@@ -11,7 +10,6 @@ import '../../../../state/app/modules/timetable/bloc/timetable_bloc.dart';
 import '../../../../state/app/modules/timetable/bloc/timetable_state.dart';
 import '../../../../widget/debug/debug_tile.dart';
 import '../../../../widget/details_bottom_sheet.dart';
-import '../../../../widget/unimplemented_dialog.dart';
 
 class WebuntisLessonSheet {
   static void show(
@@ -72,7 +70,7 @@ class WebuntisLessonSheet {
             }).toList(),
           ),
         _roomTile(context, state, lesson),
-        _teacherTile(context, lesson),
+        _teacherTile(lesson),
         if ((lesson.activityType ?? '').trim().isNotEmpty)
           ListTile(
             leading: const Icon(Icons.abc),
@@ -120,14 +118,15 @@ class WebuntisLessonSheet {
       final name = firstNonEmpty([resolved.name, r.name, '?']);
       final longname = firstNonEmpty([resolved.longName, r.longname, '']);
       final building = resolved.building.trim();
-      return LessonFormatter.formatLine(
+      final main = LessonFormatter.formatLine(
         name,
-        longname: longname,
         extra: (building.isNotEmpty && building != '?') ? building : null,
       );
+      final sub = (longname.isNotEmpty && longname != name) ? longname : null;
+      return (main: main, sub: sub);
     }).toList();
 
-    return _listTile(
+    return _listTileWithSubs(
       icon: Icons.room,
       label: lesson.ro.length == 1 ? 'Raum' : 'Räume',
       entries: entries,
@@ -135,39 +134,63 @@ class WebuntisLessonSheet {
     );
   }
 
-  static Widget _teacherTile(
-    BuildContext context,
-    GetTimetableResponseObject lesson,
-  ) {
-    final trailing = Visibility(
-      visible: !kReleaseMode,
-      child: IconButton(
-        icon: const Icon(Icons.textsms_outlined),
-        onPressed: () => UnimplementedDialog.show(context),
-      ),
-    );
-
+  static Widget _teacherTile(GetTimetableResponseObject lesson) {
     if (lesson.te.isEmpty) {
-      return ListTile(
-        leading: const Icon(Icons.person),
-        title: const Text('Lehrkraft: ?'),
-        trailing: trailing,
+      return const ListTile(
+        leading: Icon(Icons.person),
+        title: Text('Lehrkraft: ?'),
       );
     }
 
     final entries = lesson.te.map((t) {
-      final base = LessonFormatter.formatLine(
+      final main = LessonFormatter.formatLine(
         t.name.isNotEmpty ? t.name : '?',
         longname: t.longname,
       );
       final orgname = (t.orgname ?? '').trim();
-      return orgname.isEmpty ? base : '$base · ehemals $orgname';
+      return (main: main, sub: orgname.isEmpty ? null : 'ehemals $orgname');
     }).toList();
 
-    return _listTile(
+    return _listTileWithSubs(
       icon: Icons.person,
       label: lesson.te.length == 1 ? 'Lehrkraft' : 'Lehrkräfte',
       entries: entries,
+    );
+  }
+
+  static Widget _listTileWithSubs({
+    required IconData icon,
+    required String label,
+    required List<({String main, String? sub})> entries,
+    Widget? trailing,
+  }) {
+    if (entries.length == 1) {
+      final e = entries.first;
+      return ListTile(
+        leading: Icon(icon),
+        title: Text('$label: ${e.main}'),
+        subtitle: e.sub != null ? Text(e.sub!) : null,
+        trailing: trailing,
+      );
+    }
+    return ListTile(
+      leading: Icon(icon),
+      title: Text(label),
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: entries
+            .expand<Widget>(
+              (e) => [
+                Text(e.main),
+                if (e.sub != null)
+                  Padding(
+                    padding: const EdgeInsets.only(left: 12),
+                    child: Text(e.sub!),
+                  ),
+              ],
+            )
+            .toList(),
+      ),
       trailing: trailing,
     );
   }