FM-EN-17 datasheet framework

The shared FM-EN-17-style layout engine behind every DekEn datasheet — an A4 paper-look cover page with approval/revision-history blocks, an OPERATING CONDITION + SPECIFICATION vendor page, then calculation pages with figures, rendered identically on screen and in print.

• You need a datasheet that reads like a vendor RFQ document an EPC or supplier already expects, not a raw printout of a form.
• You're adding a new calculator and need it to inherit cover/approval/revision structure for free instead of building a one-off layout.
• You want screen and print output to match so a PDF export looks exactly like what was reviewed on screen.

One shared Datasheet component renders any buildXSpec(input, coverOverrides?) output through a fixed A4 template (cover + approval/revision table + OPERATING CONDITION/SPECIFICATION blocks + calc pages) — method: template + data, not per-calculator HTML.