Pages and panels showed inconsistent loading states: the Backup center
and several admin pages (System, SSH, admin Overview), the Overview
Migrate/Peers panels, the per-app updater section and the backup engine
details modal rendered a bare 'Loading…' text line (updater-empty /
backup-empty-state) with no spinner, while Services/Config/Tasks used a
boxed card + spinner.
Add one shared loader — window.lpLoadingBox(message) + .lp-loading CSS in
the core/loading subsystem (the boxed card + accent spinner the good tabs
already use) — and route those bare-text loaders through it. The system
metric graph keeps its absolute overlay but gains the same spinner.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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