site-builder: dynamic CTAs, section anchors, edit-with-Sitesmith

Three related features:

1. Dynamic CTA buttons on HeroSimple, CTASection, CallToAction.
   New shared ctas[] array (text + href + variant + target) replaces the
   primary/secondary pair. Settings panel gets add/remove/reorder controls.
   Legacy fields stay readable for backwards compat — first user edit
   migrates the section onto the new array.

2. Anchor IDs on all layout/section components (Container, Section,
   BackgroundSection, ColumnLayout, plus 6 section blocks done by parallel
   subagent, plus Hero/CTA/CallToAction). Anchor input lives in the
   settings panel with an "auto from heading" button that walks the
   subtree for the first Heading.text. Renders as id="..." on the
   outermost element so #anchor URLs resolve.

3. Edit-with-Sitesmith targeted invocation. Right-click → "Ask Sitesmith"
   and a button at the top of the right-side settings panel both open the
   modal pre-targeted at the selected node. The node's serialized subtree
   is sent to the server; system prompt is augmented to require a patch
   with replace_node. Editor lifts modal state into a new SitesmithContext.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

craft/src/components/layout/BackgroundSection.tsx

@@ -2,6 +2,7 @@ import React, { CSSProperties } from 'react';
 import { useNode, Element, UserComponent } from '@craftjs/core';
 import { Container } from './Container';
 import { cssPropsToString } from '../../utils/style-helpers';
+import { AnchorIdField } from '../../ui/AnchorIdField';
 
 interface BackgroundSectionProps {
   bgImage?: string;
@@ -11,6 +12,7 @@ interface BackgroundSectionProps {
   innerMaxWidth?: string;
   style?: CSSProperties;
   children?: React.ReactNode;
+  anchorId?: string;
 }
 
 export const BackgroundSection: UserComponent<BackgroundSectionProps> = ({
@@ -20,12 +22,14 @@ export const BackgroundSection: UserComponent<BackgroundSectionProps> = ({
   overlayOpacity = 0.4,
   innerMaxWidth = '1200px',
   style = {},
+  anchorId,
 }) => {
   const { connectors: { connect, drag } } = useNode();
 
   return (
     <section
       ref={(ref: HTMLElement | null): void => { if (ref) connect(drag(ref)); }}
+      id={anchorId || undefined}
       style={{
         position: 'relative',
         width: '100%',
@@ -77,6 +81,7 @@ const BackgroundSectionSettings: React.FC = () => {
 
   return (
     <div style={{ padding: '12px', display: 'flex', flexDirection: 'column', gap: '14px' }}>
+      <AnchorIdField />
       <div>
         <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 }}>Background Image URL</label>
         <input
@@ -162,6 +167,7 @@ BackgroundSection.craft = {
     overlayOpacity: 0.4,
     innerMaxWidth: '1200px',
     style: { padding: '0' },
+    anchorId: '',
   },
   rules: {
     canDrag: () => true,
@@ -176,6 +182,7 @@ BackgroundSection.craft = {
 /* ---------- HTML export ---------- */
 
 (BackgroundSection as any).toHtml = (props: BackgroundSectionProps, childrenHtml: string) => {
+  const esc = (s: any) => String(s ?? "").replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
   const outerStyle = cssPropsToString({
     position: 'relative',
     width: '100%',
@@ -200,7 +207,8 @@ BackgroundSection.craft = {
     margin: '0 auto',
     padding: '60px 20px',
   });
+  const idAttr = props.anchorId ? ` id="${esc(props.anchorId)}"` : '';
   return {
-    html: `<section${outerStyle ? ` style="${outerStyle}"` : ''}><div${overlayStyle ? ` style="${overlayStyle}"` : ''}></div><div${innerStyle ? ` style="${innerStyle}"` : ''}>${childrenHtml}</div></section>`,
+    html: `<section${idAttr}${outerStyle ? ` style="${outerStyle}"` : ''}><div${overlayStyle ? ` style="${overlayStyle}"` : ''}></div><div${innerStyle ? ` style="${innerStyle}"` : ''}>${childrenHtml}</div></section>`,
   };
 };