This example renders a top-down tree and highlights only the hovered node together with its directly connected lines. It demonstrates `RGSlotOnNode` hover handlers, runtime neighbor lookup through `getLines()`, temporary node and line class updates, animated line styling in SCSS, and a shared floating utility panel for canvas settings and image export.

Highlight Related Lines on Node Hover

What This Example Builds

This example builds a full-height tree viewer that emphasizes a node’s immediate relationships when the pointer moves over that node. The screen shows a small top-down hierarchy of letter-labeled items, rounded purple node chips, and orthogonal connectors, with a floating helper window layered above the canvas.

The main visible effect is transient relation highlighting. Hovering a node adds a strong halo to that node and anim