refactor(builder): use shared escaper everywhere, drop 26 local copies

Replace divergent, buggy local esc/escapeHtml helpers across 26 files with
imports from src/utils/escape (escapeHtml/escapeAttr). Attribute call sites use
escapeAttr, text-content sites use escapeHtml. Several toHtml outputs now
correctly escape & where old local escapers omitted it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

craft/src/components/layout/BackgroundSection.tsx

@@ -3,6 +3,7 @@ import { useNode, Element, UserComponent } from '@craftjs/core';
 import { Container } from './Container';
 import { cssPropsToString } from '../../utils/style-helpers';
 import { AnchorIdField } from '../../ui/AnchorIdField';
+import { escapeAttr } from '../../utils/escape';
 
 interface BackgroundSectionProps {
   bgImage?: string;
@@ -182,7 +183,6 @@ 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%',
@@ -207,7 +207,7 @@ BackgroundSection.craft = {
     margin: '0 auto',
     padding: '60px 20px',
   });
-  const idAttr = props.anchorId ? ` id="${esc(props.anchorId)}"` : '';
+  const idAttr = props.anchorId ? ` id="${escapeAttr(props.anchorId)}"` : '';
   return {
     html: `<section${idAttr}${outerStyle ? ` style="${outerStyle}"` : ''}><div${overlayStyle ? ` style="${overlayStyle}"` : ''}></div><div${innerStyle ? ` style="${innerStyle}"` : ''}>${childrenHtml}</div></section>`,
   };