fix: dynamic PDF height based on receipt content length

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/admin/src/components/pos/pos-receipt.tsx

@@ -273,6 +273,10 @@ export async function downloadReceiptPDF(txnNumber?: string) {
   const el = document.getElementById('pos-receipt-print')
   if (!el) return
 
+  // Calculate height from actual content
+  const heightPx = el.scrollHeight + 16 // 16px padding
+  const heightMm = Math.ceil(heightPx * 0.265) + 8 // px to mm + margin
+
   const html2pdf = (await import('html2pdf.js')).default
   html2pdf()
     .set({
@@ -280,7 +284,7 @@ export async function downloadReceiptPDF(txnNumber?: string) {
       filename: `receipt-${txnNumber ?? 'unknown'}.pdf`,
       image: { type: 'jpeg', quality: 0.95 },
       html2canvas: { scale: 2, useCORS: true, width: 280 },
-      jsPDF: { unit: 'mm', format: [72, 250], orientation: 'portrait' },
+      jsPDF: { unit: 'mm', format: [72, heightMm], orientation: 'portrait' },
     })
     .from(el)
     .save()