v0.1.7

Template changes (templates/base/partials/header.html):

1. Added a mobile-only
   with plain Profile and Logout links inside the collapsible
   section (only for authenticated users)
   • Wrapped the desktop avatar dropdown in d-none d-lg-flex so it's hidden on mobile
   • Kept Login/Register links visible on all screen sizes (not wrapped in d-none)

The result: on mobile, authenticated users see Profile and Logout as regular nav items in the hamburger menu (no
dropdown, no avatar thumbnail). On desktop, the avatar dropdown works as before.