Every signup and onboarding screen has a clear next action — no dead ends

A dead-end screen — an OAuth error page with no retry, a "check your email" view with no resend link, a terminal success screen with no link into the app — is a silent funnel killer. Users who hit one cannot recover without hunting through browser history or abandoning the session entirely, and the user-experience taxon treats unreachable states as first-order defects. Every dead-end state on a signup or onboarding path directly equates to accounts that were created but never activated, or users who gave up mid-signup.

Audit every error, verification, and terminal screen in the signup and onboarding flow and add at least one actionable element to each. In src/app/(auth)/error/page.tsx render a "Try again" and "Create a new account" pair; on the email-verification screen add a "Resend verification email" button; on terminal onboarding screens link to the dashboard.

<div className="text-center space-y-4">
  <p>Something went wrong during sign in.</p>
  <Button asChild><Link href="/login">Try again</Link></Button>
  <Button variant="outline" asChild><Link href="/signup">Create a new account</Link></Button>
</div>