NEXUS — UPDATE: Payment Voucher + "Clients & Vendors" relabel
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No database changes needed. Just copy the files over (keep the structure).

WHAT'S NEW
1. PAYMENT VOUCHER (printable, on your letterhead)
   - Go to Expenses. Each row now has a "Voucher" button.
   - It generates a Payment Voucher from that expense: Paid To (vendor),
     date, category, payment method, what it was for, amount + amount in
     words, and Prepared / Approved / Received signature lines.
   - Voucher number is PV-YEAR-#### based on the expense.
   - Print or Save as PDF (tick "Background graphics" so the letterhead shows).
2. "Clients" is now labelled "Clients & Vendors" throughout, since the same
   list is used for both customers and suppliers (e.g. on Purchase Orders).

FILES IN THIS PACKAGE (copy over your live folder)
   index.php                     (adds the voucher route)
   includes/doc_template.php     (voucher rendering + amount-in-words)
   includes/header.php           (nav relabel)
   modules/expenses.php          (adds the Voucher button per row)
   modules/clients.php           (relabel headings/buttons)
   modules/voucher_print.php     (NEW)

HOW TO APPLY
1. Back up your bizmanager folder first.
2. Copy the contents of the "bizmanager" folder here over your live folder.
3. Refresh. Open Expenses and click "Voucher" on any row.

NOTE
The voucher pulls whatever is on the expense — make sure the expense's
"Vendor" and "Description" are filled in for a complete voucher. The
"Paid To" line shows the Vendor field.
