feat: add option to go back from user settings signup page by logging out (#1870)

lib/pangea/login/pages/pangea_login_scaffold.dart

@@ -9,12 +9,14 @@ class PangeaLoginScaffold extends StatelessWidget {
   final Uint8List? mainAssetBytes;
   final List<Widget> children;
   final bool showAppName;
+  final AppBar? customAppBar;
 
   const PangeaLoginScaffold({
     required this.children,
     this.mainAssetPath = "assets/pangea/PangeaChat_Glow_Logo.png",
     this.mainAssetBytes,
     this.showAppName = true,
+    this.customAppBar,
     super.key,
   });
 
@@ -22,7 +24,7 @@ class PangeaLoginScaffold extends StatelessWidget {
   Widget build(BuildContext context) {
     return SafeArea(
       child: Scaffold(
-        appBar: AppBar(),
+        appBar: customAppBar ?? AppBar(),
         body: LayoutBuilder(
           builder: (context, constraints) {
             return SingleChildScrollView(

lib/pangea/login/pages/user_settings_view.dart

@@ -10,6 +10,7 @@ import 'package:fluffychat/pangea/login/pages/pangea_login_scaffold.dart';
 import 'package:fluffychat/pangea/login/pages/user_settings.dart';
 import 'package:fluffychat/pangea/login/widgets/full_width_button.dart';
 import 'package:fluffychat/pangea/login/widgets/tos_checkbox.dart';
+import 'package:fluffychat/pangea/user/utils/p_logout.dart';
 
 class UserSettingsView extends StatelessWidget {
   final UserSettingsState controller;
@@ -69,6 +70,14 @@ class UserSettingsView extends StatelessWidget {
     return Form(
       key: controller.formKey,
       child: PangeaLoginScaffold(
+        customAppBar: AppBar(
+          leading: BackButton(
+            onPressed: () => pLogoutAction(
+              context,
+              bypassWarning: true,
+            ),
+          ),
+        ),
         showAppName: false,
         mainAssetPath: controller.selectedAvatarPath ?? "",
         mainAssetBytes: controller.avatar,

lib/pangea/user/utils/p_logout.dart

@@ -6,7 +6,12 @@ import 'package:fluffychat/widgets/adaptive_dialogs/show_ok_cancel_alert_dialog.
 import 'package:fluffychat/widgets/future_loading_dialog.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
-void pLogoutAction(BuildContext context, {bool? isDestructiveAction}) async {
+void pLogoutAction(
+  BuildContext context, {
+  bool? isDestructiveAction,
+  bool bypassWarning = false,
+}) async {
+  if (!bypassWarning) {
     if (await showOkCancelAlertDialog(
           useRootNavigator: false,
           context: context,
@@ -18,6 +23,8 @@ void pLogoutAction(BuildContext context, {bool? isDestructiveAction}) async {
         OkCancelResult.cancel) {
       return;
     }
+  }
+
   final matrix = Matrix.of(context);
 
   // before wiping out locally cached construct data, save it to the server