Two of the three motion gaps mara flagged on the swarm-ui jobs graph
(the third, node status changes as a tree of nesting divs rather than
a node-link diagram, has no edges to animate today — see the issue
thread for that scoping correction).
- New node mount: .jg-node gets a fade+slide-in keyframe. No JS change
needed — Preact only creates a new .jg-node DOM node when its key
(the node id) is genuinely new, so this only plays on first
appearance, not every fetch re-render.
- State change flash: NodeView tracks each node's previous state via
a ref; on a real change it adds .jg-state-flash to the glyph span
(removed on animationend), driving a scale pulse.
Both follow the same three-rule motion-guard shape as Shell.css's
shell-page-enter / LinksMenu.css's links-menu-popover-enter.
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