feat: improve closing receipt print styling and add PrinterService patch for reliable UI handling

static/src/app/closing_receipt.css

@@ -0,0 +1,29 @@
+.pos-closing-receipt-print {
+    width: 512px;
+    font-size: 22px;
+    color: #000000;
+}
+
+.pos-closing-receipt-print .pos-receipt {
+    padding-left: 20px !important;
+    padding-right: 20px !important;
+    box-sizing: border-box !important;
+}
+
+@media print {
+    iframe.pos-print-iframe {
+        display: block !important;
+        position: fixed !important;
+        left: -9999px !important;
+        top: -9999px !important;
+        width: 0 !important;
+        height: 0 !important;
+        border: 0 !important;
+    }
+
+    .pos-closing-receipt-print .pos-receipt {
+        padding-left: 20px !important;
+        padding-right: 20px !important;
+        box-sizing: border-box !important;
+    }
+}

static/src/app/closing_receipt.xml

@@ -7,7 +7,7 @@
         (printer service with webPrintFallback: true).
     -->
     <t t-name="pos_closing_receipt.ClosingReceipt">
-        <div class="pos-receipt-print">
+        <div class="pos-closing-receipt-print">
             <div class="pos-receipt" style="font-family: 'Courier New', Courier, monospace; font-size: 18px; width: 100%; max-width: 320px; margin: 0 auto; padding: 12px;">
 
                 <!-- ===== HEADER ===== -->

static/src/app/closing_receipt_patch.js

@@ -8,6 +8,28 @@ import { Component } from "@odoo/owl";
 import { parseFloat } from "@web/views/fields/parsers";
 import { ConnectionLostError } from "@web/core/network/rpc";
 import { _t } from "@web/core/l10n/translation";
+import { PrinterService } from "@point_of_sale/app/services/printer_service";
+import { waitImages } from "@point_of_sale/utils";
+
+// Patch PrinterService.printWeb to return a promise that resolves only after print dialog is closed
+patch(PrinterService.prototype, {
+    async printWeb(el) {
+        console.log("[pos_closing_receipt] Patched printWeb called");
+        await this.renderer.whenMounted({
+            el,
+            callback: async (elClone) => {
+                console.log("[pos_closing_receipt] printWeb whenMounted callback started. Awaiting images...");
+                await waitImages(elClone);
+                console.log("[pos_closing_receipt] Images loaded. Invoking window.print...");
+                window.print(elClone);
+                console.log("[pos_closing_receipt] window.print has returned.");
+            },
+        });
+        console.log("[pos_closing_receipt] Patched printWeb fully resolved and returning true.");
+        return true;
+    }
+});
+
 
 // ─────────────────────────────────────────────────────────────────────────────
 // ClosingReceipt OWL Component
@@ -137,12 +159,29 @@ patch(ClosePosPopup.prototype, {
     },
 
     async _printClosingReceipt(receiptData) {
+        console.log("[pos_closing_receipt] Initiating closing receipt print...");
+        if (this.pos.env.services.ui) {
+            console.log("[pos_closing_receipt] Blocking UI during print...");
+            this.pos.env.services.ui.block();
+        }
         try {
-            await this.printer.print(ClosingReceipt, receiptData, {
+            const printResult = await this.printer.print(ClosingReceipt, receiptData, {
                 webPrintFallback: true,
             });
+            console.log("[pos_closing_receipt] Print operation resolved with result:", printResult);
+            
+            // Explicit safety delay to let printer buffers flush (especially for Bluetooth/JSPM)
+            const delayMs = 1500;
+            console.log(`[pos_closing_receipt] Applying safety buffer delay of ${delayMs}ms...`);
+            await new Promise((resolve) => setTimeout(resolve, delayMs));
+            console.log("[pos_closing_receipt] Safety buffer complete.");
         } catch (err) {
-            console.warn("[pos_closing_receipt] Failed to print closing receipt:", err);
+            console.error("[pos_closing_receipt] CRITICAL: Failed to print closing receipt:", err);
+        } finally {
+            if (this.pos.env.services.ui) {
+                console.log("[pos_closing_receipt] Unblocking UI.");
+                this.pos.env.services.ui.unblock();
+            }
         }
     },