Instead of a glance + 'Open backup center' button, the Backups tab now mounts
the real BackupPage (dashboard/snapshots/locations/migrate/configuration) inline,
with its sidebar restyled as a nested tab strip and its own header taking over.
- BackupPage gains an embedded mode (opts.embedded): no /backup URL coupling, so
sub-tabs switch in-page under /overview/backups. Backward compatible.
- OverviewManager lazy-loads the backup bundle + fragment on first open, news a
BackupPage({embedded:true}), and disposes it on apps-feature unmount. Colliding
ids (#sidebar/#mobile-overlay) are stripped on inject.
- Revert the Admin backup-config surface — the embedded center (incl.
Configuration) is now the single home for backup settings.
- The updater needs no equivalent: its sections were already unpacked into the
Overview/Updates/Improvements tabs + the per-row expander.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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