Renders (possibly unsaved) editor sections through the real production pipeline — sample data, regional compliance blocks, QuestPDF — and returns one PNG per page. More than one page on a fixed-size label format means the content overflows the label.

Request to render a live preview of (possibly unsaved) template editor state through the real production render pipeline.

Server-rendered template preview: one PNG per output page plus the physical page dimensions. More than one page on a fixed-size label format means the content overflows the label.