fixed overwrite on internal copy, DST drift in widget anchors, inline errors without controller and removed dead room lookup

lib/widget/confirm_dialog.dart

@@ -13,6 +13,9 @@ class ConfirmDialog extends StatelessWidget {
   /// Label of the cancel button. Set to `null` for a single-button dialog
   /// (only the confirm action is rendered).
   final String? cancelButton;
+
+  /// Optional: without [onConfirm]/[onConfirmAsync] the dialog only reports
+  /// the decision via [ask].
   final void Function()? onConfirm;
   final AsyncActionCallback? onConfirmAsync;
   final AsyncErrorBuilder? errorBuilder;
@@ -27,15 +30,17 @@ class ConfirmDialog extends StatelessWidget {
     this.onConfirm,
     this.onConfirmAsync,
     this.errorBuilder,
-  }) : assert(
-         onConfirm != null || onConfirmAsync != null,
-         'ConfirmDialog requires either onConfirm or onConfirmAsync',
-       );
+  });
 
   void asDialog(BuildContext context) {
     showDialog(context: context, builder: build);
   }
 
+  /// Resolves to true once confirmed – with [onConfirmAsync] only after it
+  /// succeeded.
+  Future<bool> ask(BuildContext context) async =>
+      await showDialog<bool>(context: context, builder: build) ?? false;
+
   @override
   Widget build(BuildContext context) => AlertDialog(
     icon: icon != null ? Icon(icon) : null,
@@ -59,8 +64,8 @@ class ConfirmDialog extends StatelessWidget {
             TextButton(
               onPressed: () {
                 Haptics.confirm();
-                Navigator.of(context).pop();
-                onConfirm!();
+                Navigator.of(context).pop(true);
+                onConfirm?.call();
               },
               child: Text(confirmButton),
             ),