fix: Bootstrap hint

lib/views/chat_list.dart

@@ -174,12 +174,8 @@ class _ChatListState extends State<ChatList> {
 
   final GlobalKey<DefaultAppBarSearchFieldState> _searchFieldKey = GlobalKey();
 
-  Future<List<ThirdPartyIdentifier>> _thirdPartyIdentifierFuture;
-
   @override
   Widget build(BuildContext context) {
-    _thirdPartyIdentifierFuture ??=
-        Matrix.of(context).client.requestThirdPartyIdentifiers();
     return StreamBuilder<Object>(
         stream: Matrix.of(context).onShareContentChanged.stream,
         builder: (_, __) {

lib/views/contacts.dart

@@ -140,12 +140,7 @@ class _ContactsState extends State<Contacts> {
                           color: Colors.grey,
                         ),
                         Center(
-                          child: RaisedButton(
-                            elevation: 7,
-                            color: Theme.of(context).scaffoldBackgroundColor,
-                            shape: RoundedRectangleBorder(
-                              borderRadius: BorderRadius.circular(6),
-                            ),
+                          child: OutlinedButton(
                             child: Text(
                               L10n.of(context).inviteContact,
                               style: TextStyle(

lib/views/settings.dart

@@ -378,6 +378,34 @@ class _SettingsState extends State<Settings> {
                         .textTheme
                         .headline6
                         .color)),
+            actions: [
+              FutureBuilder(
+                  future: crossSigningCachedFuture,
+                  builder: (context, snapshot) {
+                    final needsBootstrap = Matrix.of(context)
+                                .client
+                                .encryption
+                                .crossSigning
+                                .enabled ==
+                            false ||
+                        snapshot.data == false;
+                    final isUnknownSession =
+                        Matrix.of(context).client.isUnknownSession;
+                    final displayHeader = needsBootstrap || isUnknownSession;
+                    if (!displayHeader) return Container();
+                    return TextButton.icon(
+                      icon: Icon(Icons.cloud, color: Colors.red),
+                      label: Text(
+                        L10n.of(context).chatBackup,
+                        style: TextStyle(color: Colors.red),
+                      ),
+                      onPressed: () async {
+                        await BootstrapDialog().show(context);
+                        AdaptivePageLayout.of(context).popUntilIsFirst();
+                      },
+                    );
+                  }),
+            ],
             backgroundColor: Theme.of(context).appBarTheme.color,
             flexibleSpace: FlexibleSpaceBar(
               background: ContentBanner(profile?.avatarUrl,