Issue #3594936: Render entity title as H1 via module-owned templates isolated...

zooneyrequested to merge
issue/markdownify-3594936:3594936-ensure-proper-heading into 1.1.x

Issue #3594936: Render entity title as H1 via module-owned templates isolated from the page template

Markdownify renders entities through the view builder in isolation from the page template, so the entity template's 'not page' guard suppresses the H1 (or emits it as a linked H2) and no page title block runs to provide the H1.

  • Add hook_theme() registering node--markdownify and taxonomy-term--markdownify
  • Add theme suggestion + preprocess hooks gated on #markdownify_page
  • Set #markdownify_page on the full view-mode build in the renderer
  • Normalize post-conversion whitespace in the converter

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