refactor: stabilize app bootstrap and polling

lib/screens/homes_screen.dart

@@ -180,12 +180,20 @@ class _HomesScreenState extends ConsumerState<HomesScreen> {
 
   /// Выбрать дом и перейти на пульт
   void _selectHome(BuildContext context, HomeConfig home) async {
-    await ref.read(currentHomeProvider.notifier).switchTo(home);
-    await ref.read(authInfoProvider.notifier).load();
-    if (context.mounted) {
-      Navigator.of(context).pushReplacement(
-        MaterialPageRoute(builder: (_) => const RemoteScreen()),
-      );
+    try {
+      await ref.read(currentHomeProvider.notifier).switchTo(home);
+      await ref.read(authInfoProvider.notifier).load(failOnError: true);
+      if (context.mounted) {
+        Navigator.of(context).pushReplacement(
+          MaterialPageRoute(builder: (_) => const RemoteScreen()),
+        );
+      }
+    } catch (e) {
+      if (context.mounted) {
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('Не удалось выбрать дом: $e')));
+      }
     }
   }