0.5.0

Added

• New custom block: "React App" (celestial/react-app) that mounts a small React application on the front end via viewScript using @wordpress/element's createRoot. Includes an interactive counter example and shared styles.
• Documentation: "Color Management Policy" (docs/color-management.md) describing how colors are centrally managed via theme/theme.json and why editor color controls are disabled.
• Theme styles: core-button.css and core-image.css to style core block variants.
• Button style variant: 01-arrow.json for core/button.

Changed

• Smart Header block: save implementation now renders <InnerBlocks.Content /> to output nested blocks in the front end.
• README: link to the new Color Management documentation and clarify quick start steps for building blocks and running the local wp-env environment.