[Catalyst 1677] Dont reset login form data

[jamesqquick]

What/Why?

Don't reset login form data on a failed login attempt. This way the user doesn't have to enter their email address again from scratch,

Testing

Navigate to /login and attempt to login with invalid credentials. You should see an error message but the form data should be maintained.

CleanShot.2026-01-09.at.15.31.36.mp4

Migration

Added a call to event.preventDefault() in the onSubmission callback to ensure default resetting of form data doesn't not happen in the sign up form.

const [form, fields] = useForm({
  //...
  onSubmit(event, { formData }) {
    event.preventDefault();
    startTransition(() => {
      formAction(formData);
    });
  }
});

[changeset-bot]

🦋 Changeset detected

Latest commit: 6bfcd30

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@bigcommerce/catalyst-core	Patch

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Project	Deployment	Review	Updated (UTC)
catalyst	Ready	Preview, Comment	Jan 9, 2026 9:32pm