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

lib/view/pages/timetable/timetable.dart

@@ -46,6 +46,10 @@ class _TimetableState extends State<Timetable> {
     if (guardDemoAction(context)) return;
     final ref = await AppRoutes.openElementPicker(context);
     if (!mounted || ref == null) return;
+    _openElement(ref);
+  }
+
+  void _openElement(TimetableElementRef ref) {
     setState(() => _selected = ref);
   }
 
@@ -103,6 +107,7 @@ class _TimetableState extends State<Timetable> {
     final atToday = innerState != null && _isOnInitialWeek(innerState);
     final capabilities = context.watch<CapabilitiesCubit>();
     final canViewForeign = capabilities.canViewForeignTimetables;
+    final teacherPlan = capabilities.isTeacher;
     return Scaffold(
       appBar: AppBar(
         // Der Kalender scrollt nicht (nur ziehen/reloaden), aber seine internen
@@ -162,10 +167,12 @@ class _TimetableState extends State<Timetable> {
             state,
             apt,
             canEditSubjectColor: true,
+            teacherPlan: teacherPlan,
+            onOpenElement: canViewForeign ? _openElement : null,
           ),
           onCreateEvent: _onCreateEventAt,
           customEvents: state.customEvents?.events ?? const [],
-          showClassInsteadOfTeacher: capabilities.isTeacher,
+          showClassInsteadOfTeacher: teacherPlan,
         ),
       ),
     );
@@ -179,6 +186,7 @@ class _TimetableState extends State<Timetable> {
     final canViewForeign = context
         .watch<CapabilitiesCubit>()
         .canViewForeignTimetables;
+    final teacherPlan = selected.type == TimetableElementType.teacher;
     return Scaffold(
       appBar: AppBar(
         // Siehe _buildOwnPlan: den scroll-under-Farbwechsel unterdrücken, weil
@@ -214,11 +222,15 @@ class _TimetableState extends State<Timetable> {
                 key: _calendarKey,
                 state: state,
                 onWeekChanged: bloc.changeWeek,
-                onAppointmentTap: (apt) =>
-                    AppointmentDetailsDispatcher.show(context, state, apt),
+                onAppointmentTap: (apt) => AppointmentDetailsDispatcher.show(
+                  context,
+                  state,
+                  apt,
+                  teacherPlan: teacherPlan,
+                  onOpenElement: canViewForeign ? _openElement : null,
+                ),
                 customEvents: const [],
-                showClassInsteadOfTeacher:
-                    selected.type == TimetableElementType.teacher,
+                showClassInsteadOfTeacher: teacherPlan,
               ),
             ),
           ),