the lead photograph, and names for the subject blocks

`collection-cover` draws the FIRST photograph in the gallery, large, beside the words — the shape the
client's sitemap draws. Not a second way to choose one: a gallery is ordered and reordering it is how
the lead changes, which is the rule everywhere else here.

The five subject blocks are places-only, like the contact form and the partner row. They hold nothing
at all — what they draw is the collection the URL names.

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

web/sections/PageBuilderPanel.tsx

@@ -23,6 +23,11 @@ const LABELS: Record<string, string> = {
   'contact-form': 'Contact form',
   partners: 'Partners',
   collections: 'Collections',
+  'collection-cover': 'Lead photograph',
+  'collection-title': 'Name',
+  'collection-description': 'Description',
+  'collection-specs': 'Specs',
+  'collection-gallery': 'Photographs',
 };
 
 /*
@@ -31,7 +36,17 @@ const LABELS: Record<string, string> = {
   Both the picker and the canvas ask the same question — one to decide whether to open an editor, the
   other whether to draw an Edit button — and two lists would drift into a button that opens nothing.
 */
-const PLACES_ONLY: string[] = ['contact-form', 'partners', 'collections'];
+const PLACES_ONLY: string[] = [
+  'contact-form',
+  'partners',
+  'collections',
+  // The subject blocks hold nothing either: what they draw is the collection the URL names.
+  'collection-cover',
+  'collection-title',
+  'collection-description',
+  'collection-specs',
+  'collection-gallery',
+];
 import { AddSectionDialog, type SectionLayout } from './AddSectionDialog';
 import { FreeTextEditor } from './FreeTextEditor';
 import { SpacingEditor, type Padding } from './SpacingEditor';