Rename block .editor files to .config

Also drop the color and leftSideBarVisible overrides from PageEditor.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014xjLo7mFxZXfPDCHuKX4Dz

components/shopify/collections.config.tsx

@@ -0,0 +1,25 @@
+import { ComponentConfig } from '@reacteditor/core';
+import { FolderOpen } from 'lucide-react';
+import Collections from '@/components/shopify/collections';
+
+export type CollectionsBlockProps = {
+  title?: string;
+  subtitle?: string;
+};
+
+const collectionsEditor: ComponentConfig<CollectionsBlockProps> = {
+  label: 'Collection grid',
+  icon: <FolderOpen size={16} />,
+  category: 'commerce',
+  defaultProps: {
+    title: 'Our Collections',
+    subtitle: 'Discover our carefully crafted worlds',
+  },
+  fields: {
+    title: { label: 'Title', type: 'text', contentEditable: true },
+    subtitle: { label: 'Subtitle', type: 'textarea', contentEditable: true },
+  },
+  render: (props) => <Collections {...props} />,
+};
+
+export default collectionsEditor;