Form Error Summary

The block that appears above a form after a failed submit — "There are 3 problems with your submission" followed by one link per error that jumps focus straight to the field it came from. Use it on any form long enough that the broken field can be off screen: signup and checkout, account or billing settings, a multi-step wizard, an onboarding or application form, an admin create/edit page, or anywhere a server action returns field errors. Common asks it answers: "error summary", "validation summary", "show all form errors at the top", "list validation errors with links to fields", "focus the f