This plugin extends the functionality of the featured image block, allowing site editors to add descriptive captions directly within the block editor. It is designed for users of block-based themes who want to provide more context for the primary images on their posts and pages.

• Caption Toolbar Integration: Adds the familiar "Add caption" button to the featured image block's toolbar, matching the interface used for standard image blocks.
• Media Library Source: Caption text is pulled from the image's metadata stored in the site's media library, ensuring a single source of truth.
• Block Theme Support: Works within the site editor for block themes, enhancing the visual editing experience for header images.
• Prototype Functionality: Serves as a working implementation to demonstrate and test a proposed core feature for the block editor.