Split dashboard priority and host status sections into server-rendered
partials and wire them into the shared refresh hook so operational state
updates without a full page reload.
Refs #36
Add a server-rendered run detail partial and a small vanilla JavaScript
refresh hook so active backup runs update status, controls, timing, and
rsync log output without a full page reload.
Document the Django-template-first refresh pattern for future control
panel work.
Refs #36
