feat: Pods fields in Theme Builder bodies checked against the template's post types (E12)

Both forms Divi writes are recognized (ruling Q11): custom_meta_<key> and the
dialog form post_meta_key + select_meta_key. Choice fields get a note about the
stored value, relation fields name IDs (F4). Only templates the user may edit
are checked or named; others are counted (Q21 pattern). Warnings only, also in
the dry run of a live body. DynamicFields extracted from lit/divi-dynamic-sources.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Pages/DiviWriter.php

@@ -211,9 +211,17 @@ final class DiviWriter
             return $this->save($ability, $page, $change, $input, SaveScope::ThemeBuilderLayout);
         }
 
+        // E12: fields in a body checked against the templates' post types – warnings only, also in the dry run.
+        $fieldWarnings = $this->themeBuilder->fieldWarnings($page, $change);
+        foreach ($fieldWarnings as $warning) {
+            $change->warning($warning);
+        }
+
         $prepared = $this->themeBuilder->prepare($page, $input);
         if ($prepared instanceof WP_Error) {
-            return $prepared;
+            return $fieldWarnings !== [] && Errors::codeOf($prepared) === 'confirm_required'
+                ? VisibleEdits::merged($prepared, 'Hinweise zu Feldern siehe warnings.', ['warnings' => $fieldWarnings])
+                : $prepared;
         }
 
         return $this->savePrepared($ability, $page, $change, $input, $prepared, 'des Theme-Builder-Layouts');