fix(pdf): Überweisungs-QR-Code überdeckt keine Positionen und Summen mehr

Reichen Positionen oder Summen auf der letzten Seite in den Bereich des QR-Codes, wird er auf einer eigenen Folgeseite gedruckt. Die MCP-Vorschau meldet das und schlägt einen früheren Seitenumbruch vor.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/src/utils/pdf.ts

@@ -163,8 +163,14 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
                 - paymentQrLayout.sizeMm * mm
         }
 
+        // Top edge (mm from the top) of the QR label at its fixed bottom-right spot.
+        const getPaymentQrTopMm = (page: any) => page.getHeight() / mm
+            - (paymentQrLayout.bottomMarginMm + paymentQrLayout.sizeMm + paymentQrLayout.labelGapMm) - 8 / mm
+        // Set once the amounts are placed: the QR moves to its own page if it would cover them.
+        let paymentQrOnNewPage = false
+
         const getTextWidthBeforePaymentQr = (page: any, startX: number) => {
-            if (!paymentQrCode) return 500
+            if (!paymentQrCode || paymentQrOnNewPage) return 500
 
             return Math.max(
                 240,
@@ -902,6 +908,8 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
 
         let endTextDiff = 35
         const layoutContentEnd = rowHeight
+        // Visible bottom of the last row (rowHeight is the next baseline); totals extend it below.
+        let amountsBottomMm = rowHeight - 3
 
         if (!deliveryNoteLikeDocumentTypes.includes(invoiceData.type)) {
             pages[pageCounter - 1].drawLine({
@@ -1016,6 +1024,11 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
 
             }
 
+            // Totals are baselines 8 mm apart; tax notes (13b/19/12.3) add one more line below.
+            const totalLines = invoiceData.totalArray.length + (["13b UStG", "19 UStG", "12.3 UStG"].includes(invoiceData.taxType) ? 1 : 0)
+            amountsBottomMm = rowHeight + (totalLines - 1) * 8 + 1
+            paymentQrOnNewPage = Boolean(paymentQrCode) && amountsBottomMm + 2 > getPaymentQrTopMm(pages[pageCounter - 1])
+
             const endTextPosition = getCoordinatesForPDFLib(21, rowHeight + endTextDiff + (invoiceData.totalArray.length - 3) * 8, page1)
 
             if (layout) {
@@ -1023,9 +1036,7 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
                 const lines = String(invoiceData.endText || "").split("\n")
                     .reduce((sum, line) => sum + Math.max(1, Math.ceil(font.widthOfTextAtSize(line, 10) / maxWidth)), 0)
                 const topMm = rowHeight + endTextDiff + (invoiceData.totalArray.length - 3) * 8
-                // Totals are baselines 8 mm apart; tax notes (13b/19/12.3) add one more line below.
-                const totalLines = invoiceData.totalArray.length + (["13b UStG", "19 UStG", "12.3 UStG"].includes(invoiceData.taxType) ? 1 : 0)
-                layout.totals = { page: pageCounter, topMm: layoutContentEnd, bottomMm: rowHeight + (totalLines - 1) * 8 + 1 }
+                layout.totals = { page: pageCounter, topMm: layoutContentEnd, bottomMm: amountsBottomMm }
                 // drawText places the baseline of the first line; 10 pt line height ≈ 3.53 mm.
                 layout.endText = { page: pageCounter, topMm: topMm - 3.53, bottomMm: topMm + (lines - 1) * 3.53 + 1 }
             }
@@ -1041,6 +1052,16 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
         }
 
         if (paymentQrCode) {
+            // Invoice-like documents decide this before placing the end text.
+            if (deliveryNoteLikeDocumentTypes.includes(invoiceData.type)) {
+                paymentQrOnNewPage = amountsBottomMm + 2 > getPaymentQrTopMm(pages[pages.length - 1])
+            }
+            if (paymentQrOnNewPage) {
+                // Positions or totals reach the QR area; never draw the code over amounts.
+                const qrPage = pdfDoc.addPage()
+                qrPage.drawPage(secondPageBackground, { x: 0, y: 0 })
+                pages.push(qrPage)
+            }
             const lastPage = pages[pages.length - 1]
             const qrSize = paymentQrLayout.sizeMm * mm
             const bottomMargin = paymentQrLayout.bottomMarginMm * mm