Straight port from V2 adapted for V5 field names. Creates expense
receipts with dynamic line items, VAT calculation (Included/Excluded/
None at 15%), and emails HTML + PDF to Spark Receipt. Uses lazy
xhtml2pdf import to avoid crashing if not installed on server.
Files: forms.py (ExpenseReceiptForm + FormSet), views.py (create_receipt),
create_receipt.html, receipt_email.html, receipt_pdf.html, urls.py, base.html
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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