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.