Fix alignment in create and restore wallet screens

lib/src/screens/base_page.dart

@@ -35,6 +35,8 @@ abstract class BasePage extends StatelessWidget {
 
   Widget? get endDrawer => null;
 
+  bool get canUseDesktopAppBar => false;
+
   AppBarStyle get appBarStyle => AppBarStyle.regular;
 
   Widget Function(BuildContext, Widget)? get rootWrapper => null;
@@ -97,6 +99,7 @@ abstract class BasePage extends StatelessWidget {
   ObstructingPreferredSizeWidget appBar(BuildContext context) {
     final appBarColor = currentTheme.type == ThemeType.dark
         ? backgroundDarkColor : backgroundLightColor;
+    final useDesktopAppbar = !ResponsiveLayoutUtil.instance.isMobile(context) && canUseDesktopAppBar;
     
     switch (appBarStyle) {
       case AppBarStyle.regular:
@@ -106,6 +109,7 @@ abstract class BasePage extends StatelessWidget {
             leading: leading(context),
             middle: middle(context),
             trailing: trailing(context),
+            useDesktopAppbar: useDesktopAppbar,
             backgroundColor: appBarColor);
 
       case AppBarStyle.withShadow:
@@ -115,6 +119,7 @@ abstract class BasePage extends StatelessWidget {
             leading: leading(context),
             middle: middle(context),
             trailing: trailing(context),
+            useDesktopAppbar: useDesktopAppbar,
             backgroundColor: appBarColor);
 
       case AppBarStyle.transparent:
@@ -132,6 +137,7 @@ abstract class BasePage extends StatelessWidget {
             // context: context,
             leading: leading(context),
             middle: middle(context),
+            useDesktopAppbar: useDesktopAppbar,
             trailing: trailing(context),
             backgroundColor: appBarColor);
     }

lib/src/screens/dashboard/desktop_widgets/desktop_sidebar_wrapper.dart

@@ -25,6 +25,9 @@ class DesktopSidebarWrapper extends BasePage {
     required this.dashboardViewModel,
   });
 
+  @override
+  bool get canUseDesktopAppBar => true;
+
   @override
   Color get backgroundLightColor =>
       currentTheme.type == ThemeType.bright ? Colors.transparent : Colors.white;

lib/src/screens/restore/restore_from_backup_page.dart

@@ -1,6 +1,7 @@
 import 'package:cake_wallet/core/execution_state.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/src/widgets/alert_with_one_action.dart';
+import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/src/widgets/framework.dart';
@@ -39,7 +40,10 @@ class RestoreFromBackupPage extends BasePage {
       }
     });
 
-    return Container(
+    return Center(
+      child: ConstrainedBox(
+        constraints: BoxConstraints(maxWidth: ResponsiveLayoutUtil.kDesktopMaxWidthConstraint),
+        child: Padding(
             padding: EdgeInsets.only(bottom: 24, left: 24, right: 24),
             child: Column(children: [
               Expanded(
@@ -75,7 +79,9 @@ class RestoreFromBackupPage extends BasePage {
                       textColor: Colors.white);
                 }))
               ])),
-        ]));
+            ])),
+      ),
+    );
   }
 
   Future<void> presentFilePicker() async {

lib/src/screens/restore/restore_options_page.dart

@@ -1,3 +1,4 @@
+import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:flutter/material.dart';
 import 'package:cake_wallet/routes.dart';
 import 'package:flutter/cupertino.dart';
@@ -18,10 +19,11 @@ class RestoreOptionsPage extends BasePage {
 
   @override
   Widget body(BuildContext context) {
-    return Container(
-        width: double.infinity,
+    return Center(
+      child: Container(
+          width: ResponsiveLayoutUtil.kDesktopMaxWidthConstraint,
           height: double.infinity,
-        padding: EdgeInsets.all(24),
+          padding: EdgeInsets.symmetric(vertical: 24),
           child: SingleChildScrollView(
             child: Column(
               children: <Widget>[
@@ -43,6 +45,7 @@ class RestoreOptionsPage extends BasePage {
                 )
               ],
             ),
-        ));
+          )),
+    );
   }
 }

lib/src/screens/seed/pre_seed_page.dart

@@ -1,3 +1,4 @@
+import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cake_wallet/routes.dart';
 import 'package:cake_wallet/themes/theme_base.dart';
@@ -33,7 +34,10 @@ class PreSeedPage extends BasePage {
     return WillPopScope(
         onWillPop: () async => false,
         child: Container(
+          alignment: Alignment.center,
           padding: EdgeInsets.all(24),
+          child: ConstrainedBox(
+              constraints: BoxConstraints(maxWidth: ResponsiveLayoutUtil.kDesktopMaxWidthConstraint),
             child: Column(
               children: [
                 Flexible(
@@ -72,6 +76,7 @@ class PreSeedPage extends BasePage {
                     ))
               ],
             ),
+          ),
         ));
   }
 }

lib/src/screens/seed/wallet_seed_page.dart

@@ -1,9 +1,9 @@
 import 'package:cake_wallet/palette.dart';
 import 'package:cake_wallet/themes/theme_base.dart';
 import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
+import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:cake_wallet/utils/show_bar.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:share_plus/share_plus.dart';
@@ -22,6 +22,9 @@ class WalletSeedPage extends BasePage {
   @override
   String get title => S.current.seed_title;
 
+  @override
+  bool get canUseDesktopAppBar => false;  
+
   final bool isNewWalletCreated;
   final WalletSeedViewModel walletSeedViewModel;
 
@@ -53,7 +56,7 @@ class WalletSeedPage extends BasePage {
 
   @override
   Widget? leading(BuildContext context) =>
-      isNewWalletCreated ? Offstage() : super.leading(context);
+      isNewWalletCreated ? null: super.leading(context);
 
   @override
   Widget trailing(BuildContext context) {
@@ -86,6 +89,10 @@ class WalletSeedPage extends BasePage {
 
     return WillPopScope(onWillPop: () async => false, child:  Container(
         padding: EdgeInsets.all(24),
+        alignment: Alignment.center,
+        child: ConstrainedBox(
+          constraints:
+              BoxConstraints(maxWidth: ResponsiveLayoutUtil.kDesktopMaxWidthConstraint),
           child: Column(
             children: <Widget>[
               Flexible(
@@ -190,6 +197,7 @@ class WalletSeedPage extends BasePage {
                     ],
                   ))
             ],
+          ),
         )));
   }
 }

lib/src/widgets/nav_bar.dart

@@ -1,23 +1,24 @@
-import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:flutter/cupertino.dart';
 
 class NavBar extends StatelessWidget implements ObstructingPreferredSizeWidget {
-  factory NavBar({Widget? leading, Widget? middle, Widget? trailing, Color? backgroundColor}) {
+  factory NavBar({Widget? leading, Widget? middle, Widget? trailing, bool useDesktopAppbar = false, Color? backgroundColor,}) {
     return NavBar._internal(
         leading: leading,
         middle: middle,
         trailing: trailing,
         height: _height,
+        useDesktopAppbar: useDesktopAppbar,
         backgroundColor: backgroundColor);
   }
 
   factory NavBar.withShadow(
-      {Widget? leading, Widget? middle, Widget? trailing, Color? backgroundColor}) {
+      {Widget? leading, Widget? middle, Widget? trailing, Color? backgroundColor, bool useDesktopAppbar = false,}) {
     return NavBar._internal(
       leading: leading,
       middle: middle,
       trailing: trailing,
       height: 80,
+      useDesktopAppbar: useDesktopAppbar,
       backgroundColor: backgroundColor,
       decoration: BoxDecoration(
         color: backgroundColor,
@@ -38,6 +39,7 @@ class NavBar extends StatelessWidget implements ObstructingPreferredSizeWidget {
       this.trailing,
       this.backgroundColor,
       this.decoration,
+      this.useDesktopAppbar = false,
       this.height = _height});
 
   static const _originalHeight = 44.0; // iOS nav bar height
@@ -49,6 +51,7 @@ class NavBar extends StatelessWidget implements ObstructingPreferredSizeWidget {
   final Color? backgroundColor;
   final BoxDecoration? decoration;
   final double height;
+  final bool useDesktopAppbar;
 
   @override
   Widget build(BuildContext context) {
@@ -60,7 +63,7 @@ class NavBar extends StatelessWidget implements ObstructingPreferredSizeWidget {
     final paddingTop = pad / 2;
     final _paddingBottom = (pad / 2);
 
-    if (!ResponsiveLayoutUtil.instance.isMobile(context)) {
+    if (useDesktopAppbar) {
       return Container(
         padding: const EdgeInsetsDirectional.only(end: 24),
         color: backgroundColor,