fix(ios): expose public validateToken() overload for post-avatar-upload refresh

ios/LibNovel/LibNovel/Services/AuthStore.swift

@@ -85,7 +85,14 @@ final class AuthStore: ObservableObject {
         }
     }
 
-    // MARK: - Token validation (on cold launch)
+    // MARK: - Token validation
+
+    /// Re-validates the current session and refreshes `user` + `settings`.
+    /// Call this after any operation that may change the user record (e.g. avatar upload).
+    func validateToken() async {
+        guard let token = loadToken() else { return }
+        await validateToken(token)
+    }
 
     private func validateToken(_ token: String) async {
         await APIClient.shared.setAuthCookie(token)