190: Render the gallery modal from the paragraph entity instead of by ID - Alternative

[dblanken-yale]

190: Add Block Cloning Functionality

Description of work

• templates/paragraphs/_gallery-item.twig rendered the lightbox contents with
  drupal_entity('paragraph', item.entity.id.0.value, ...), which needs a saved
  paragraph ID. An unsaved paragraph has none, so the modal came out empty in the Layout
  Builder preview even though the media reference was present and the canonical node route
  was fine.
• Now renders from the entity object via twig_tweak's view filter, which takes an
  EntityInterface and keeps the same check_access default — no access change.
• This affected any unsaved gallery item, not only cloned ones: adding a gallery item and
  previewing before save hit the same empty modal. The old is not iterable guard was
  suppressing the error rather than fixing the cause.
• Single work unit with the companion yalesites-project PR — that PR adds the Clone
  option that makes this reachable, and it carries the matching branch name that
  build_frontend needs to swap this branch into the multidev.
• Other work completed in: 190: Add block cloning to Layout Builder - Alternative yalesites-project#1414

Functional testing steps:

• On a page with a Gallery block, open the block in Layout Builder and confirm the grid thumbnails still look identical to before
• Click a thumbnail and confirm the lightbox opens with the full image and its caption/heading
• Add a new gallery item and, before saving, open its lightbox from the Layout Builder preview — the image should now appear (previously blank)
• Clone a Gallery block (companion PR) and confirm the copy's lightbox shows the right images in the preview
• View the page on the canonical route (not Layout Builder) and confirm the gallery and lightbox are unchanged

References yalesites-org/YaleSites-Internal#190

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