Added pull-to-refresh on App page when no webpage shown

lib/pages/app.dart

@@ -35,12 +35,16 @@ class _AppPageState extends State<AppPage> {
     return Scaffold(
       appBar: settingsProvider.showAppWebpage ? AppBar() : null,
       backgroundColor: Theme.of(context).colorScheme.surface,
-      body: settingsProvider.showAppWebpage
+      body: RefreshIndicator(
+          child: settingsProvider.showAppWebpage
               ? WebView(
                   initialUrl: app?.app.url,
                   javascriptMode: JavascriptMode.unrestricted,
                 )
-          : Column(
+              : CustomScrollView(
+                  slivers: [
+                    SliverFillRemaining(
+                        child: Column(
                       mainAxisAlignment: MainAxisAlignment.center,
                       crossAxisAlignment: CrossAxisAlignment.stretch,
                       children: [
@@ -95,7 +99,20 @@ class _AppPageState extends State<AppPage> {
                               fontStyle: FontStyle.italic, fontSize: 12),
                         )
                       ],
+                    )),
+                  ],
                 ),
+          onRefresh: () async {
+            if (app != null) {
+              try {
+                await appsProvider.getUpdate(app.app.id);
+              } catch (e) {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(content: Text(e.toString())),
+                );
+              }
+            }
+          }),
       bottomSheet: Padding(
           padding: EdgeInsets.fromLTRB(
               0, 0, 0, MediaQuery.of(context).padding.bottom),