The admin pages used bare inline-styled tables on the default page
background. Rebuilt the admin shell + added a scoped .admin CSS layer so
the whole panel matches the original AtomCMS Filament look:
- Dark #2d2d44 sidebar (the AtomCMS admin navbar colour) with the nav
grouped into Overview / Content / Users & access / Economy / Radio /
System (mirrors the Filament resource groups), an avatar + rank badge
header, and amber active-link highlighting via a client AdminNavLink
(usePathname).
- A topbar ("Housekeeping" + signed-in user) over a light content area.
- Carded tables (surface bg, rounded, shadow, tinted header, row hover)
and a page-title treatment, applied globally so every admin page is
styled without per-page edits.
Verified in a real authenticated admin session (production server,
amx_test): sidebar renders #2d2d44 sticky, active link amber on dark
text, /admin/users table carded with 7 real rows; dev server serves the
admin rules after a cache refresh. tsc 0, vitest 49/49, next build 0.
