- Add @encryptid/sdk (vendored) for WebAuthn passkey authentication
- Add zustand auth store matching rMaps/rWork pattern
- Create AuthButton component (sign in / register / sign out)
- Create HeaderBar client component: AppSwitcher + logo + nav + auth + cart
- Remove custom SpaceSwitcher (not part of standard rApp header)
- Fix hero: "Noticed" and "rMerch" now use same gradient color
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
