feat(site-builder): array editors scroll to the item picked in Layers

Wires ArrayItemFieldsEditor and FeaturesEditor up to useLayerFocus() so
clicking a virtual row in the Layers tree scrolls the matching item's
card into view in the right-hand array editor. scrollIntoView is
optional-chained on both the queried element and the method itself so
a miss or an environment without it degrades silently.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

craft/src/panels/right/styles/ArrayItemFields.tsx

@@ -1,6 +1,7 @@
-import React from 'react';
+import React, { useEffect, useRef } from 'react';
 import { useEditor } from '@craftjs/core';
 import { CollapsibleSection, ArrayPropEditor, smallInputStyle } from './shared';
+import { useLayerFocus } from '../../left/LayerFocusContext';
 
 /* ---------- Shared array-item field editor ----------
    Extracted from SectionTypePanel and GenericPropsEditor, which both had a
@@ -18,7 +19,26 @@ export const ArrayItemFieldsEditor: React.FC<{ selectedId: string; propKey: stri
   const sampleItem = arrayItems[0] || {};
   const itemFields = typeof sampleItem === 'object' && sampleItem !== null ? Object.keys(sampleItem) : [];
 
+  // Layers panel -> array editor "scroll to this item" hookup. The outer
+  // <div ref={rootRef}> wraps ArrayPropEditor's rendered cards (the actual
+  // per-item background box lives in shared.tsx's ArrayPropEditor, which is
+  // also used by MediaStylePanel/FormStylePanel -- rather than touch that
+  // shared component for one consumer, the data-array-item tag below goes
+  // on the content renderItem returns, which is enough for scrollIntoView
+  // to bring the right card into the viewport.
+  const { focus } = useLayerFocus();
+  const rootRef = useRef<HTMLDivElement | null>(null);
+
+  useEffect(() => {
+    if (!focus || focus.prop !== propKey) return;
+    const card = rootRef.current?.querySelector(`[data-array-item="${propKey}:${focus.index}"]`);
+    card?.scrollIntoView?.({ block: 'nearest', behavior: 'smooth' });
+    // `focus.nonce` is in the dep list so clicking the SAME row twice
+    // re-scrolls (the request object is otherwise identical).
+  }, [focus?.nonce, focus?.prop, focus?.index, propKey]);
+
   return (
+    <div ref={rootRef}>
     <CollapsibleSection title={propKey.replace(/([A-Z])/g, ' $1').trim()}>
       <ArrayPropEditor
         selectedId={selectedId}
@@ -29,6 +49,7 @@ export const ArrayItemFieldsEditor: React.FC<{ selectedId: string; propKey: stri
             return (
               <input
                 type="text"
+                data-array-item={`${propKey}:${index}`}
                 value={String(item)}
                 onChange={(e) => {
                   actions.setProp(selectedId, (props: any) => {
@@ -42,7 +63,7 @@ export const ArrayItemFieldsEditor: React.FC<{ selectedId: string; propKey: stri
             );
           }
           return (
-            <div style={{ display: 'flex', flexDirection: 'column', gap: 3 }}>
+            <div data-array-item={`${propKey}:${index}`} style={{ display: 'flex', flexDirection: 'column', gap: 3 }}>
               {itemFields.map((field) => {
                 const fieldVal = item[field];
                 if (typeof fieldVal === 'boolean') {
@@ -123,5 +144,6 @@ export const ArrayItemFieldsEditor: React.FC<{ selectedId: string; propKey: stri
         }
       />
     </CollapsibleSection>
+    </div>
   );
 };