Bevy UI layout

When to use

Load this when laying out HUD or menu nodes. Text content stays on bevy-ui-text. Colors and widget styling stay on bevy-ui-theming.

ECS shape

• Crate text (opened): spawn UI with widget::Button, ImageNode, Text, and Node. Layout uses Flexbox and CSS Grid.
• Components named: Node, BackgroundColor, BorderColor, BorderRadius, ComputedNode, GridPlacement, GridTrack, GlobalZIndex.
• Feature: bevy_ui is a custom ECS-driven UI framework.
• Systems: layout and update systems are engine-owned (bevy::ui::update exists). Do not write a second layout pass.

Coming from Godot