Vue hydration silently drops class attribute updates when SSR and client
render different branches of a v-if chain — per the project's Auth SSR
Pattern, useAuth is client-only and server always renders unauthenticated,
so PageHeader (v-else branch) was rendering inside a leftover .loading /
.loading-state div from the v-else-if branch. On mobile that div was
being masked by the visual-test commonMasks (.loading-state), producing
a large fuchsia block in the snapshot.
Wrapping the v-if/v-else-if/v-else chain in <ClientOnly> ensures the
server renders nothing for the auth-gated content and the client performs
a clean first render, matching the pattern already used in dashboard.vue.
Also update admin-dashboard-desktop for minor anti-aliasing drift.
Migrate the entire admin section from the dark guild-* Tailwind theme
to the zine design system (dashed borders, CSS custom properties,
Brygada 1918 + Commit Mono, cream/dark mode palette).
- Replace admin top-nav layout with sidebar matching default layout
- Reskin dashboard, members, events, series management pages
- Reskin events/create and series/create form pages
- Add dev-only test login endpoint (GET /api/dev/test-login)
- Redirect duplicate admin/dashboard.vue to /admin
- Update CLAUDE.md design system docs
