limit size of loading indicator for link previews

lib/widgets/link_preview.dart

@@ -12,14 +12,14 @@ class LinkPreview extends ConsumerWidget {
   const LinkPreview(this.link, {super.key});
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) => ref
+  Widget build(BuildContext context, WidgetRef ref) => ConstrainedBox(
+    constraints: BoxConstraints.loose(Size.fromWidth(400)),
+    child: ref
         .watch(UrlPreviewController.provider(link))
         .betterWhen(
           data: (preview) => preview == null
               ? SizedBox.shrink()
-            : ConstrainedBox(
-                constraints: BoxConstraints.loose(Size.fromWidth(400)),
-                child: InkWell(
+              : InkWell(
                   onTap: () => ref
                       .watch(LaunchHelper.provider)
                       .launchUrl(Uri.parse(link)),