transition 1

lib/features/auth/data/token_storage.dart

@@ -39,4 +39,22 @@ class TokenStorage {
       await clear();
     }
   }
+
+  Future<bool> hasValidAccessToken() async {
+    final a = await access;
+    if (a == null || a.isEmpty) return false;
+    try {
+      final parts = a.split('.');
+      if (parts.length != 3) return false;
+      final payload = jsonDecode(
+              utf8.decode(base64Url.decode(base64Url.normalize(parts[1]))))
+          as Map<String, dynamic>;
+      final exp = (payload['exp'] as num?)?.toInt();
+      if (exp == null) return true;
+      final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;
+      return now < exp - 15;
+    } catch (_) {
+      return false;
+    }
+  }
 }