fix: agrega helper esc en accounting.js y placeholder para pagos a proveedor

pos/static/js/accounting.js

@@ -25,6 +25,12 @@ const Accounting = (() => {
     function fmt(n) {
         return parseFloat(n || 0).toLocaleString('es-MX', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
     }
+    function esc(s) {
+        if (!s) return '';
+        const d = document.createElement('div');
+        d.textContent = s;
+        return d.innerHTML;
+    }
 
     // ---- Auth check ----
     function checkAuth() {
@@ -236,7 +242,7 @@ const Accounting = (() => {
                     <td class="td--amount">$${fmt(r.paid || 0)}</td>
                     <td class="td--amount">$${fmt(r.balance || r.total)}</td>
                     <td>${statusBadge(status, label)}</td>
-                    <td><button class="btn btn--ghost btn--sm">${r.balance > 0 ? 'Pagar' : 'Ver'}</button></td>
+                    <td><button class="btn btn--ghost btn--sm" onclick="alert('Pago a proveedor aún no está implementado')">${r.balance > 0 ? 'Pagar' : 'Ver'}</button></td>
                 </tr>`;
             }).join('');