test(14): add Nyquist validation tests for AUTH-UI-01/02/03
auth_login_test.go: LoginPage renders AuthLayout structure (login-screen,
auth-card-shell, brand-logo, h1, auth-body, divider-pill), HTMX form
attributes, password not echoed.
auth_components_test.go: AnimatedBackground exactly 35 elements,
GoogleButton configured/unconfigured variants, AuthDivider or-pill.
handlers_auth_test.go: extend configured provider tests to assert
class="gsi-material-button" on the anchor element (AUTH-UI-03).
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
dcbc05b642