The header now carries only Search and a new Saved searches page; everything
admin (Instances, Folders, Status, plus the renamed Appearance and User
management) lives in the user menu under an Administration heading. On mobile —
and as an installed PWA — the navigation moves to a bottom bar so it stays in
reach.

A new User settings page collects the personal preferences behind underline
tabs: password change (was a modal) on one, language and light/dark theme (were
in the header) on the other. The header loses the GitHub link, language switcher
and theme button as a result.

An always-visible footer shows the GitHub link, the site name and the deployed
version. The version comes from NUXT_PUBLIC_APP_VERSION, which CI bakes from the
git tag (web Dockerfile build-arg), falling back to the package version locally.

Admin > Status gains "Rebuild index" and "Clear index" buttons on the search
index card, behind confirmations.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>