Two-wave plan: Plan 01 creates foundation (logo assets, full auth.css
replacement with animations, auth_components.templ, auth_layout.templ);
Plan 02 migrates auth_login.templ and auth_signup.templ to AuthLayout
with @ui.FormField inputs and cross-page nav links, closing AUTH-UI-01..03.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>