feat: handle error messages from login app

Author: CodeSchwert

src/Packages/Passport/Runtime/Scripts/Private/UI/IPassportWebView.cs

@@ -12,6 +12,22 @@ public class VuplexMessage
         public string method;
         public string data;
     }
+
+    /// <summary>
+    /// Error data structure for JavaScript error messages
+    /// Matches the TypeScript Error serialization: {message: string, name: string}
+    /// </summary>
+    [System.Serializable]
+    public class ErrorData
+    {
+        public string message;
+        public string name;
+
+        public override string ToString()
+        {
+            return $"ErrorData(name: {name}, message: {message})";
+        }
+    }
     /// <summary>
     /// Platform abstraction interface for PassportUI WebView implementations.
     /// Provides a unified API for different WebView technologies across platforms:

src/Packages/Passport/Runtime/Scripts/Public/PassportUI.cs

@@ -197,6 +197,7 @@ private void CreateWebView()
 
                 // Register JavaScript methods
                 webView.RegisterJavaScriptMethod("HandleLoginData", HandleLoginData);
+                webView.RegisterJavaScriptMethod("HandleLoginError", HandleLoginError);
 
                 isInitialized = true;
                 PassportLogger.Info($"{TAG} Cross-platform WebView created successfully");
@@ -369,6 +370,44 @@ private async void HandleLoginData(string jsonData)
             }
         }
 
+        /// <summary>
+        /// Handles error messages received from JavaScript
+        /// Called when the login page encounters an error and sends error information
+        /// </summary>
+        /// <param name="jsonData">JSON string containing error data</param>
+        private void HandleLoginError(string jsonData)
+        {
+            try
+            {
+                PassportLogger.Info($"{TAG} Received error data from JavaScript: {jsonData}");
+
+                // Parse the JSON error data
+                ErrorData errorData = JsonUtility.FromJson<ErrorData>(jsonData);
+                PassportLogger.Error($"{TAG} Login page error: {errorData}");
+
+                // Create user-friendly error message
+                string errorMessage = !string.IsNullOrEmpty(errorData.message)
+                    ? $"Login failed: {errorData.message}"
+                    : "Login failed due to an unknown error";
+
+                // Trigger failure events
+                OnLoginFailure?.Invoke(errorMessage);
+                OnLoginFailureStatic?.Invoke(errorMessage);
+
+                // Hide the WebView after error
+                HideLoginUI();
+            }
+            catch (Exception ex)
+            {
+                string errorMessage = $"Failed to handle error message from JavaScript: {ex.Message}";
+                PassportLogger.Error($"{TAG} {errorMessage}");
+
+                // Trigger failure events even if we can't parse the error
+                OnLoginFailure?.Invoke("Login failed due to an error processing error message");
+                OnLoginFailureStatic?.Invoke("Login failed due to an error processing error message");
+            }
+        }
+
         private void SetupLoginButton()
         {
             if (loginButton != null)