[APP-9877] Implement button functionality (pose) (#442)

* add pose widget

* add pose functionality

* use theme data

* use pose instead of list

Author: martha-johnston

lib/src/utils.dart

@@ -1,4 +1,6 @@
 import 'package:fixnum/fixnum.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_platform_widgets/flutter_platform_widgets.dart';
 import 'package:grpc/grpc.dart';
 import 'package:logger/logger.dart';
 
@@ -121,3 +123,19 @@ String getVersionMetadata() {
 
   return 'flutter;$sdkVersion;$apiTag';
 }
+
+/// Show an error dialog with one action: OK, which simply dismisses the dialog
+Future<void> showErrorDialog(BuildContext context, {String title = 'An Error Occurred', String? error}) async {
+  return showAdaptiveDialog(
+      context: context,
+      builder: (context) => AlertDialog.adaptive(
+            title: Text(title),
+            content: error == null ? null : Text(error),
+            actions: [
+              PlatformDialogAction(
+                onPressed: Navigator.of(context).pop,
+                child: Text('OK'),
+              )
+            ],
+          ));
+}