Introduce a per-fleet Overview area inside the apps shell, reachable from a new
'Overview' entry pinned above the apps sidebar search. Selecting it renders a
top-tabbed view in the main pane — Overview · Updates · Improvements · Backups —
mirroring the per-app tabbed layout, with the apps sidebar persistent.
- TabController: generic root-scoped show/hide tab host (core/ui-state).
- OverviewManager: drives the 4 tabs. Reuses a headless UpdaterPage for all
update/CVE/improvement data + rendering (its renderX() are pure HTML
producers) and reads backup/dashboard.json directly for backup health.
- Overview tab: combined update + backup health cards.
- Updates tab: per-app expander table (CVEs/recovery/history inline via the new
UpdaterPage.renderAppDetail) + All/Updates/Security filter chips.
- Improvements tab: reuses the updater's signed-hotfix renderer.
- Backups tab: fleet backup-health tiles; actions deep-link per app.
- Additive only: /overview* routes on the apps feature; old /updater and
/backup pages untouched. Cleanup (redirects, nav, Admin config move) is next.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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