Gutenberg blocks

Each of the four shortcodes ships as a dynamic Gutenberg block so authors who work in the block editor don't have to remember shortcode syntax.

Block	Wraps	Attributes (sidebar)
`pfm/form`	`[pfm_form]`	entity, sysId, returnUrl, successMessage
`pfm/list`	`[pfm_list]`	entity, filter, columns, pageSize, view
`pfm/record`	`[pfm_record]`	entity, sysId, template
`pfm/action-button`	`[pfm_action]`	action ("<entity>.<slug>"), sysId, label, style

Every block is dynamic — the JS save() returns null and the PHP render_callback calls the same handler the shortcode uses. That guarantees both surfaces emit identical HTML, run the same permission gate, and flip the same AssetLoader::mark_needed() flag so the front-end bundle enqueues conditionally.

Editor preview is a placeholder card with the entity slug + an <InspectorControls> panel; the real React render happens only at view time on the visitor's page.

Block widgets work out of the box because any block can be dropped into a Widget Area. Pattern variations / templates are not registered yet — they're a follow-up.