opt.: app bar

Fixes #727

lib/view/page/setting/entry.dart

@@ -71,7 +71,7 @@ class _SettingsPageState extends State<SettingsPage>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
+      appBar: CustomAppBar(
         title: Text(libL10n.setting, style: const TextStyle(fontSize: 20)),
         bottom: TabBar(
           controller: _tabCtrl,

lib/view/page/setting/platform/android.dart

@@ -17,7 +17,7 @@ class _AndroidSettingsPageState extends State<AndroidSettingsPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Android')),
+      appBar: CustomAppBar(title: const Text('Android')),
       body: ListView(
         padding: const EdgeInsets.symmetric(horizontal: 17),
         children: [

lib/view/page/setting/platform/ios.dart

@@ -27,7 +27,7 @@ class _IOSSettingsPageState extends State<IOSSettingsPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('iOS')),
+      appBar: CustomAppBar(title: const Text('iOS')),
       body: ListView(
         padding: const EdgeInsets.symmetric(horizontal: 17),
         children: [

lib/view/page/setting/seq/srv_detail_seq.dart

@@ -17,7 +17,7 @@ class _ServerDetailOrderPageState extends State<ServerDetailOrderPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text(l10n.serverDetailOrder)),
+      appBar: CustomAppBar(title: Text(l10n.serverDetailOrder)),
       body: _buildBody(),
     );
   }

lib/view/page/setting/seq/srv_func_seq.dart

@@ -17,7 +17,7 @@ class _ServerDetailOrderPageState extends State<ServerFuncBtnsOrderPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text(l10n.sequence)),
+      appBar: CustomAppBar(title: Text(l10n.sequence)),
       body: _buildBody(),
     );
   }

lib/view/page/setting/seq/srv_seq.dart

@@ -16,7 +16,7 @@ class _ServerOrderPageState extends State<ServerOrderPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text(l10n.serverOrder)),
+      appBar: CustomAppBar(title: Text(l10n.serverOrder)),
       body: _buildBody(),
     );
   }

lib/view/page/setting/seq/virt_key.dart

@@ -17,7 +17,7 @@ class _SSHVirtKeySettingPageState extends State<SSHVirtKeySettingPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text(l10n.editVirtKeys)),
+      appBar: CustomAppBar(title: Text(l10n.editVirtKeys)),
       body: Column(
         children: [
           Padding(