Success stories: downloads and product sections become real plugins

- comparison report migrations/check_product_downloads.php (kept,
  read-only): download records vs. the delivered product workbooks -
  34 of 74 workbook products have a datasheet, the entire Datapath
  line has none in the pool (import came from vitec.com; queued for
  Joe), ~35 orphan datasheets belong to products without records;
  a vitec:link-product-downloads re-run added seven clean links
  (Artio x2, Diamond-H, the three TOUGH records, X-View)
- RTE resolution fixed at the root: ContentElementResolver and
  ContainerChildrenProcessor passed bodytext RAW into the payload, so
  t3:// links leaked unresolved; both now run RTE columns (bodytext,
  vitec_quote) through RteResolver::html()
- the imported "Download Success Story" RTE buttons carried the wrong
  link identifier (tx_vitec_download -> download, one-time migration
  fix_download_record_links.php) AND old-site uids - missing here or,
  worse, accidentally pointing at foreign PDFs. New
  vitec:convert-story-download-buttons replaces them with real
  vitec_downloadcard plugins: the download is resolved by STORY title
  (manual map for ISR / "Okada Manilla", exact-title fallback for
  suffixless PDFs like "Lord's Cricket Ground"); 29 converted, 4
  stories without a delivered PDF have their button hidden. New
  FlexForm layout "Success Story Download" (story_download) applied
  everywhere; the FE renders it as the previous centered button
- the ADIB "Featured Products" text section (the only one site-wide,
  verified by scan_story_headers.php) is now ONE vitec_productlist
  with hand-picked products via old-name aliases and the new FlexForm
  layout "Success Story Products" (story_products); the four text
  elements are deleted. vitec:convert-story-product-sections stays
  re-runnable for future imports
- the productlist envelope additionally carries "columns" (= number
  of products, capped at 4) so the story grid renders as many columns
  as it has products - additive key, available to every product list;
  and hand-picked lists now ship successStories as an empty array (the
  empty category selection used to aggregate stories over the WHOLE
  tree, leaking story cards into the section)
- the story downloadcards carry header "Downloads" (set on convert
  and backfilled): the front end builds the story anchor nav from
  element headers, so the section now appears there
- diagnosis scripts kept: check_download_record, check_story_elements,
  scan_story_headers; verified live on the ADIB payload (structured
  download object, productlist [5,18,6], texts 10 -> 5)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/vitec/Classes/UserFunc/ProductListJsonRenderer.php

@@ -212,6 +212,7 @@ class ProductListJsonRenderer
                 $productsData[] = $this->serializeProduct($product);
             }
 
+
             // Envelope with layout and toolbar flag, matching the other list
             // plugins. This turned the payload from a bare array into an object:
             // the front end has to read `products.products` instead of
@@ -221,6 +222,11 @@ class ProductListJsonRenderer
             // vocabulary the other lists use.
             $response = [
                 'layout' => (string)($settings['layout'] ?? '0'),
+                // grid hint (Olli 2026-10-28): the column count follows the
+                // number of products, so a 2-product story section renders
+                // 2 columns, a 3-product one 3 - the front end reads this
+                // instead of guessing from the array length. Capped at 4.
+                'columns' => min(4, max(1, count($productsData))),
                 'showToolbar' => (bool)($settings['showtoolbar'] ?? false),
                 'products' => $productsData,
                 // Success stories the editor attached to these categories
@@ -231,7 +237,12 @@ class ProductListJsonRenderer
                 // 2026-09-16 on front-end request - it used to deliver the
                 // empty envelope), so forCategories keeps driving the
                 // ?cat=/?subcat= filter exactly like on per-category lists.
-                'successStories' => $this->successStoriesFor(
+                // Hand-picked lists (sub-market Products section, the story
+                // "Featured Products" section) show EXACTLY the picked
+                // products - no ride-along stories (2026-10-28: without this
+                // the empty category selection aggregated stories over the
+                // WHOLE tree and story cards leaked into the section).
+                'successStories' => ($selectedUids !== [] && !$allProducts) ? [] : $this->successStoriesFor(
                     ($allProducts || $categoryUids === []) ? $this->allProductCategoryUids() : $categoryUids,
                     (int)($settings['storysinglepid'] ?? 0)
                 ),