[ADD] pos_customer_display: Enhance customer display and refund section.

This improvement extends the Point of Sale customer-facing screen by:
- Displaying the customer's name (or Guest if not assigned) below the
total/change section.
- Showing the Amount / Guest if guest count is available and greater than zero.
- Separating refunded order lines into a distinct Refund section below the
regular items.

JavaScript enhancements:
- Patched PosOrder.getCustomerDisplayData() to include:
- displayCustomerName
- amountDividedPerGuest
- refundedItems and activeItems

XML template modifications:
- Used XPath inheritance to insert new rows into the customer display.
- Replaced the original OrderWidget to support line segregation.

This update improves the clarity and transparency of the POS display for
customers, especially in multi-guest and refund scenarios.

Author: agir-odoo

pos_customer_display/__init__.py

@@ -0,0 +1,24 @@
+{
+    'name': 'POS Customer Display Name',
+    'version': '1.0',
+    'summary': 'Adding POS customer name on payment screeen',
+    'description': """
+Showing Customer Diplay Name
+============================
+This module will show customer name on the customer display.
+
+also will show refund lines septarately under refund subsection.
+    """,
+    'author': 'Raghav Agiwal',
+    'depends': ['point_of_sale'],
+    "assets": {
+        'point_of_sale.assets_prod': [
+            'pos_customer_display/static/src/pos_order.js',
+        ],
+        'point_of_sale.customer_display_assets': [
+            'pos_customer_display/static/src/customer_display/*',
+        ],
+    },
+    'installable': True,
+    'license': 'LGPL-3'
+}

pos_customer_display/__manifest__.py

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+ <templates id="template" xml:space="preserve">
+     <t t-name="pos_customer.CustomerDisplay" t-inherit="point_of_sale.CustomerDisplay" t-inherit-mode="extension">
+        <xpath expr="//div[@t-if='order.amount and !order.finalized']" position="inside">
+            <div class="d-flex flex-column justify-content-center gap-1 w-100 w-sm-50 ms-auto">
+                <div class="row fw-bolder">
+                    <div class="col text-end">Customer</div>
+                    <div class="col text-end" t-out="order.displayCustomerName"/>
+                </div>
+                <t t-if="order.amountDividedPerGuest">
+                    <div class="row fw-bolder">
+                        <div class="col text-end">Amount</div>
+                        <div class="col text-end" t-out="format_float(order.amountDividedPerGuest, 2)"/> / Guest
+                    </div>
+                </t>
+            </div>
+        </xpath>
+
+        <xpath expr="//div[hasclass('o_customer_display_main')]/OrderWidget" position="replace">
+            <OrderWidget t-if="!order.finalized" lines="order.activeItems"/>
+            
+            <t t-if="order.refundedItems">
+                <div class="mt-3 p-2 fw-bold">Refunded Items</div>
+                <OrderWidget t-if="!order.finalized" lines="order.refundedItems"/>
+            </t>
+        </xpath>
+     </t>
+</templates>

pos_customer_display/static/src/customer_display/customer_display.xml

@@ -0,0 +1,23 @@
+import { patch } from "@web/core/utils/patch";
+import { PosOrder } from "@point_of_sale/app/models/pos_order";
+
+patch(PosOrder.prototype, {
+    getCustomerDisplayData() {
+        const allLines = this.getSortedOrderlines();
+        const returnedItems = allLines.filter(line => line.refunded_orderline_id);
+        const saleItems = allLines.filter(line => !line.refunded_orderline_id);
+
+        const guests = this.guest_count || 0;
+        const total = this.get_total_with_tax();
+        const perGuestAmount = guests > 0 ? total / guests : null;
+
+        return {
+            ...super.getCustomerDisplayData(),
+
+            displayCustomerName: this.get_partner_name() || "Guest",
+            amountDividedPerGuest: perGuestAmount,
+            refundedItems: returnedItems.map(line => line.getDisplayData()),
+            activeItems: saleItems.map(line => line.getDisplayData()),
+        };
+    },
+});