Apply the same recessed-panel treatment as the Dashboard/Tasks to the
System page: gauges, Trends, Storage, Host and Per-app now sit inside one
dark rounded box under the header divider. Generalise the Dashboard's
.admin-card-grid-wrap into a shared .admin-panel class so both admin pages
use one source of truth.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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