feat: enhance admin and profile repositories with token handling; update dropdown initial values in various screens

flutter/lib/features/recipes/data/recipe_repository.dart

@@ -17,7 +17,7 @@ class RecipeRepository {
         throw const ApiException(
             type: ApiErrorType.unknown, message: 'Ogiltigt svar från servern.');
       }
-      return (data as List)
+      return data
           .map((e) => Recipe.fromJson(e as Map<String, dynamic>))
           .toList();
     } on ApiException {

flutter/lib/features/recipes/presentation/recipe_edit_screen.dart

@@ -399,7 +399,7 @@ class _RecipeEditScreenState extends ConsumerState<RecipeEditScreen> {
               ],
             ),
             DropdownButtonFormField<int>(
-              value: ingredient.productId,
+              initialValue: ingredient.productId,
               isExpanded: true,
               decoration: const InputDecoration(
                 labelText: 'Produkt *',
@@ -461,7 +461,7 @@ class _RecipeEditScreenState extends ConsumerState<RecipeEditScreen> {
                 const SizedBox(width: 12),
                 Expanded(
                   child: DropdownButtonFormField<String>(
-                    value: ingredient.unit.trim().isEmpty ? null : ingredient.unit,
+                    initialValue: ingredient.unit.trim().isEmpty ? null : ingredient.unit,
                     isExpanded: true,
                     decoration: const InputDecoration(
                       labelText: 'Enhet *',