fix login 2

lib/screens/auth_gate.dart

@@ -0,0 +1,23 @@
+/// Routes to [LoginScreen] or [MainShell] based on PocketBase auth.
+library;
+
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../providers/auth_provider.dart';
+import 'login_screen.dart';
+import 'main_shell.dart';
+
+/// Root after splash: signed-out users see login; signed-in users see the shell.
+class AuthGate extends StatelessWidget {
+  const AuthGate({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final auth = context.watch<AuthController>();
+    if (!auth.isLoggedIn) {
+      return const LoginScreen(asRoot: true);
+    }
+    return const MainShell();
+  }
+}