Swap hardcoded Tailwind padding on NodeSwitcher, UserProfileDropdown,
and NotificationPanel for var(--density-row-x) / --density-row-y /
--density-cell-y / --density-tile-y custom properties so the three
sidebar/header overlays now tighten when the Appearance setting is
switched to Compact, matching the reference pattern in ui/table.tsx.
Replace the inline Select in the sidebar with a dedicated NodeSwitcher
component that always renders as an identity card, regardless of node
count. With two or more nodes it opens a Popover listing every node
with status dot, type, version, last-seen metadata, and an active-row
accent rail, matching the design language of the user menu and
notification panel.
Extract the relative-time formatters out of NodeManager into a shared
@/lib/relativeTime module with formatTimeUntil and formatTimeAgo, and
add a 'just now' / '<1m' branch so fresh heartbeats and imminent runs
read naturally.
Anso