fix: Skip removed entities when initializing drag & drop interface

  • Correct typo in ParagraphsWidget::buildNestedParagraphsForDragDrop
  • Adjust unit test ParagraphsDragAndDropModeTest to replicate issue encountered

Fixes a separate issue where new paragraphs created and reordered in the main editor get removed along with sibling paragraphs when switching to the drag & drop editor.

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