fix: column design for bootstrap

lib/pages/bootstrap_dialog.dart

@@ -1,4 +1,5 @@
 import 'package:adaptive_dialog/adaptive_dialog.dart';
+import 'package:fluffychat/widgets/layouts/one_page_card.dart';
 import 'package:matrix/encryption.dart';
 import 'package:matrix/encryption/utils/bootstrap.dart';
 import 'package:matrix/matrix.dart';
@@ -91,7 +92,8 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
         _recoveryKeyStored == false) {
       final key = bootstrap.newSsssKey.recoveryKey;
       titleText = L10n.of(context).securityKey;
-      return Scaffold(
+      return OnePageCard(
+        child: Scaffold(
           appBar: AppBar(
             leading: IconButton(
               icon: Icon(Icons.close),
@@ -126,6 +128,7 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
               ),
             ],
           ),
+        ),
       );
     } else {
       switch (bootstrap.state) {
@@ -158,7 +161,8 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
           break;
         case BootstrapState.openExistingSsss:
           _recoveryKeyStored = true;
-          return Scaffold(
+          return OnePageCard(
+            child: Scaffold(
               appBar: AppBar(
                 leading: IconButton(
                   icon: Icon(Icons.close),
@@ -262,6 +266,7 @@ class _BootstrapDialogState extends State<BootstrapDialog> {
                   )
                 ],
               ),
+            ),
           );
         case BootstrapState.askWipeCrossSigning:
           WidgetsBinding.instance.addPostFrameCallback(