Add a proxyNotRunning flag to the server sidebar state. The Proxy menu
item's warning icon now also appears when a proxy is configured but its
status is not "running". The navbar sends the flag in the
proxy-configuration-state-changed event, so the icon updates live.
Add tests for the dispatched flag and the sidebar bindings.
Move proxy, sentinel, resources, and terminal into the server sidebar
with nested routes and icons; extract navbar status into a shared
status-summary component; add full-width service links and compact
loading support.