Custom Toolbar and Cross-Layer Tooltips
This example shows how to disable relation-graph's built-in toolbar and replace it with a custom floating toolbar inside `RGSlotOnView`. It also demonstrates one hover system that spans toolbar buttons, view-slot anchors, canvas-slot anchors, node-slot content, and graph-rendered nodes or lines through recursive tooltip discovery and graph hit-testing.
Building a Custom Toolbar with Cross-Layer Tooltips
What This Example Builds
This example builds a read-only relation-graph scene that replaces the built-in toolbar with a floating custom toolbar and drives one hover system across several graph surfaces. Users see a small sample graph, a light vertical toolbar, four tooltip anchor blocks in the view layer, two more anchors in the canvas layer, custom node content, and dark tooltip cards that appear as the pointer moves across those elemen