simplified code across the app and consolidated duplicated helpers

lib/storage/dev_tools_settings.dart

@@ -88,14 +88,10 @@ class DevToolsSettings {
     if (trimmed.isEmpty) return null;
     final uri = Uri.tryParse(trimmed);
     if (uri == null || !uri.hasScheme) return null;
-    if (uri.scheme == 'https') {
-      // always fine
-    } else if (uri.scheme == 'http' && allowsHttpCustomEndpoint) {
-      // dev only
-    } else {
-      return null;
-    }
-    if (uri.host.isEmpty) return null;
+    final schemeAllowed =
+        uri.scheme == 'https' ||
+        (uri.scheme == 'http' && allowsHttpCustomEndpoint);
+    if (!schemeAllowed || uri.host.isEmpty) return null;
     return trimmed.endsWith('/')
         ? trimmed.substring(0, trimmed.length - 1)
         : trimmed;

lib/storage/modules_settings.dart

@@ -1,6 +1,6 @@
-import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:json_annotation/json_annotation.dart';
 
-import '../../state/app/modules/app_modules.dart';
+import '../state/app/modules/app_modules.dart';
 
 part 'modules_settings.g.dart';
 

lib/storage/timetable_favorites_settings.dart

@@ -34,8 +34,7 @@ class TimetableFavoritesSettings {
   /// Adds or removes the element in place. Returns the new favorite state
   /// (`true` = now starred). Callers persist via `SettingsCubit.val(write: true)`.
   bool toggle(TimetableElementType type, int id, String label) {
-    final existing = favorites.where((f) => f.type == type && f.id == id);
-    if (existing.isNotEmpty) {
+    if (isFavorite(type, id)) {
       favorites.removeWhere((f) => f.type == type && f.id == id);
       return false;
     }

lib/storage/timetable_settings.dart

@@ -1,6 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
 
-import '../../../view/pages/timetable/data/timetable_name_mode.dart';
+import '../view/pages/timetable/data/timetable_name_mode.dart';
 
 part 'timetable_settings.g.dart';