fix(auth): C3 review — surface seam not-found (no silent success), partial-reconcile-failure guidance, create validation order, concurrent-edit reconciler test

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Design/ApiMethodForm.razor

@@ -331,9 +331,21 @@
             return false;
         }
 
-        foreach (var update in plan.Updates)
+        try
         {
-            await ApiKeyAdmin.SetMethodsAsync(update.KeyId, update.NewMethods);
+            foreach (var update in plan.Updates)
+            {
+                var ok = await ApiKeyAdmin.SetMethodsAsync(update.KeyId, update.NewMethods);
+                if (!ok)
+                    throw new InvalidOperationException(
+                        $"Key '{NameFor(update.KeyId)}' was not found in the key store.");
+            }
+        }
+        catch (Exception ex)
+        {
+            throw new InvalidOperationException(
+                $"Method '{methodName}' was saved, but updating approved-key scopes failed partway: {ex.Message} " +
+                "Some keys may be partially updated — review them on the API Keys page and retry.", ex);
         }
 
         // Selection is now the baseline (matters if save is retried without reload).
@@ -341,6 +353,10 @@
         return true;
     }
 
+    // Returns the display name for a keyId if available from the loaded key list, else the id itself.
+    private string NameFor(string keyId) =>
+        _allKeys.FirstOrDefault(k => string.Equals(k.KeyId, keyId, StringComparison.Ordinal))?.Name ?? keyId;
+
     private void GoBack() => NavigationManager.NavigateTo("/design/external-systems");
 
     private void ToggleTestRunPanel() => _showTestRun = !_showTestRun;