Remove unused graphics.

lib/app/views/graphics.dart

@@ -1,24 +0,0 @@
-/*
- * Copyright (C) 2022 Yubico.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *       http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import 'package:flutter/material.dart';
-
-final Image noAccounts = _graphic('no-accounts');
-final Image noFingerprints = _graphic('no-fingerprints');
-final Image noPermission = _graphic('no-permission');
-final Image manageAccounts = _graphic('manage-accounts');
-
-Image _graphic(String name) => Image.asset('assets/graphics/$name.png');

lib/app/views/main_page.dart

@@ -69,11 +69,8 @@ class MainPage extends ConsumerWidget {
     });
 
     final deviceNode = ref.watch(currentDeviceProvider);
-    final isDarkTheme = Theme.of(context).brightness == Brightness.dark;
     final noKeyImage = Image.asset(
-      isDarkTheme
-          ? 'assets/graphics/no-key_dark.png'
-          : 'assets/graphics/no-key.png',
+      'assets/graphics/no-key.png',
       filterQuality: FilterQuality.medium,
       scale: 2,
       color: Theme.of(context).colorScheme.primary,