added teacher-focused lesson sheet with direct class and teacher timetable links

test/view/timetable/teacher_class_label_test.dart

@@ -65,10 +65,10 @@ void main() {
       );
     });
 
-    test('falls back to the teacher when the entry has no class', () {
+    test('shows only the room when the entry has no class', () {
       expect(
         _location(showClassInsteadOfTeacher: true, classNames: const []),
-        'A101\nMüller',
+        'A101',
       );
     });
   });