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

lib/state/app/modules/app_modules.dart

@@ -188,6 +188,27 @@ class AppModule {
     return order;
   }
 
+  /// Modules that are of no use to teachers and start out hidden for them.
+  static const Set<Modules> hiddenForTeachersByDefault = {
+    Modules.absenceReport,
+  };
+
+  /// Hides [hiddenForTeachersByDefault] once for teacher accounts; the teacher
+  /// can re-enable them in the module settings. Returns whether [settings]
+  /// changed.
+  static bool applyTeacherDefaults(
+    ModulesSettings settings, {
+    required bool isTeacher,
+  }) {
+    if (!isTeacher || settings.teacherDefaultsApplied) return false;
+    settings.hiddenModules = {
+      ...settings.hiddenModules,
+      ...hiddenForTeachersByDefault,
+    }.toList();
+    settings.teacherDefaultsApplied = true;
+    return true;
+  }
+
   // The settings list displays a capability-filtered subset, so reorder
   // indices refer to that subset; the move is applied there and merged back
   // into the full order (non-displayed modules keep their relative slots).