added reference to invoice manage

Signed-off-by: Trey <73353716+TreyWW@users.noreply.github.com>

Author: TreyWW

frontend/templates/pages/invoices/dashboard/manage.html

@@ -7,6 +7,7 @@
                 <a class="text-3xl text-neutral-800 dark:text-white break-words hover:link hover:link-secondary"
                    href="{% url 'finance:invoices:single:preview' invoice_id=invoice.id %}">
                     Invoice #{{ invoice.id }}
+                    {% if invoice.reference %}({{ invoice.reference }}){% endif %}
                 </a>
                 <div class="mt-[2px]">
                     {% if invoice.status == "paid" %}