refactor: Move widgets to lib

lib/widgets/layouts/loading_view.dart

@@ -0,0 +1,14 @@
+import 'package:adaptive_page_layout/adaptive_page_layout.dart';
+import 'package:fluffychat/widgets/matrix.dart';
+import 'package:flutter/material.dart';
+
+class LoadingView extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    if (Matrix.of(context).loginState != null) {
+      WidgetsBinding.instance.addPostFrameCallback((_) =>
+          AdaptivePageLayout.of(context).pushNamedAndRemoveAllOthers('/'));
+    }
+    return Scaffold(body: Center(child: CircularProgressIndicator()));
+  }
+}