Generates typed Svelte components for the authentication UI from a domain whose authenticatable entity declares an authenticatable block.

Emits, under assets/svelte/[v<N>/]auth/:

• LoginForm.svelte
• RegisterForm.svelte — fields dynamically derived from the authenticatable entity (every required public field + password)
• ResetPasswordForm.svelte — two-phase (request / confirm)
• ConfirmEmail.svelte — status page for /auth/confirm/:token
• TokenManager.svelte — only when the :api_token strategy is enabled
• SessionList.svelte

Returns a list of {path, source} tuples. Files preserve content below the <!-- --- CUSTOM --- --> marker on regeneration.