neon: Fix news article loading

packages/neon/lib/src/apps/news/pages/article.dart

@@ -141,6 +141,7 @@ class _NewsArticlePageState extends State<NewsArticlePage> {
           body: widget.useWebView
               ? Stack(
                   alignment: Alignment.center,
+                  fit: StackFit.expand,
                   children: [
                     WebView(
                       javascriptMode: JavascriptMode.unrestricted,
@@ -161,8 +162,7 @@ class _NewsArticlePageState extends State<NewsArticlePage> {
                       },
                     ),
                     if (_webviewLoading) ...[
-                      Expanded(
+                      ColoredBox(
-                        child: ColoredBox(
                         color: Theme.of(context).colorScheme.background,
                         child: Center(
                           child: LayoutBuilder(
@@ -173,7 +173,6 @@ class _NewsArticlePageState extends State<NewsArticlePage> {
                           ),
                         ),
                       ),
-                      ),
                     ],
                   ],
                 )