[FIX] website_sale_aplicoop: wire home delivery preference through all save flows

Three bugs prevented home_delivery from reaching sale.order:

1. #home-delivery-btn (shop sidebar) had no JS handler — clicking it did
   nothing. Now it toggles active state and persists choice to sessionStorage.

2. _executeSaveCartAsDraft (Save Cart button) never included is_delivery in
   the request body. Now reads the toggle button state (or the page-level
   data-home-delivery-enabled fallback) and sends is_delivery correctly.

3. #home-delivery-checkbox on checkout page was unchecked by default and
   always shown. Now it is pre-checked when group_order.home_delivery is
   True, wrapped in t-if to hide it when delivery is not configured, and
   synced bidirectionally with sessionStorage so the shop-page toggle state
   carries over to checkout.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

website_sale_aplicoop/static/src/js/website_sale.js

@@ -806,6 +806,30 @@
                     });
                 }
 
+                // On checkout page: apply sessionStorage delivery preference to checkbox.
+                // The shop-page toggle may have stored a "false" preference even though
+                // the checkbox is checked by default in the template.
+                var checkoutCheckbox = document.getElementById("home-delivery-checkbox");
+                if (checkoutCheckbox) {
+                    var storedDeliveryPref = sessionStorage.getItem(
+                        "eskaera_is_delivery_" + self.orderId
+                    );
+                    if (storedDeliveryPref !== null) {
+                        checkoutCheckbox.checked = storedDeliveryPref === "true";
+                        console.log(
+                            "[CHECKOUT] Restored delivery checkbox from sessionStorage:",
+                            checkoutCheckbox.checked
+                        );
+                    }
+                    // Sync sessionStorage when user manually changes the checkbox
+                    checkoutCheckbox.addEventListener("change", function () {
+                        sessionStorage.setItem(
+                            "eskaera_is_delivery_" + self.orderId,
+                            this.checked ? "true" : "false"
+                        );
+                    });
+                }
+
                 // Button to reload from draft (in My Cart header - cart pages)
                 var reloadCartBtn = document.getElementById("reload-cart-btn");
                 console.log("[_attachEventListeners] reload-cart-btn found:", !!reloadCartBtn);
@@ -830,6 +854,28 @@
                     });
                 }
 
+                // Home-delivery toggle button (shop sidebar)
+                var homeDeliveryBtn = document.getElementById("home-delivery-btn");
+                if (homeDeliveryBtn) {
+                    // Restore persisted preference on page load
+                    var storedDelivery = sessionStorage.getItem(
+                        "eskaera_is_delivery_" + self.orderId
+                    );
+                    if (storedDelivery === "true") {
+                        homeDeliveryBtn.classList.add("active");
+                    }
+                    homeDeliveryBtn.addEventListener("click", function (e) {
+                        e.preventDefault();
+                        var isNowActive = !homeDeliveryBtn.classList.contains("active");
+                        homeDeliveryBtn.classList.toggle("active", isNowActive);
+                        sessionStorage.setItem(
+                            "eskaera_is_delivery_" + self.orderId,
+                            isNowActive ? "true" : "false"
+                        );
+                        console.log("[HOME_DELIVERY_BTN] toggled to:", isNowActive);
+                    });
+                }
+
                 // Buttons to clear cart (header + footer)
                 var clearCartBtns = [
                     document.getElementById("clear-cart-btn"),
@@ -1553,6 +1599,17 @@
                 merge_action: "replace",
             };
 
+            // Include delivery preference: read from toggle button state,
+            // falling back to the page-level home-delivery-enabled attribute.
+            var deliveryBtn = document.getElementById("home-delivery-btn");
+            if (deliveryBtn) {
+                orderData.is_delivery = deliveryBtn.classList.contains("active");
+            } else {
+                var wrap = document.getElementById("wrap");
+                var enabledAttr = wrap && wrap.getAttribute("data-home-delivery-enabled");
+                orderData.is_delivery = enabledAttr === "true";
+            }
+
             var xhr = new XMLHttpRequest();
             xhr.open("POST", "/eskaera/save-order", true);
             xhr.setRequestHeader("Content-Type", "application/json");

website_sale_aplicoop/views/website_templates.xml

@@ -503,16 +503,17 @@
                                     </t>
                                 </div>
                                 <div class="oe_structure oe_empty mb-4" data-name="After Summary" />
+                                <t t-if="group_order.home_delivery">
                                 <div class="card border-0 shadow-sm mb-4">
                                     <div class="card-body">
                                         <div class="form-check">
-                                            <input type="checkbox" class="form-check-input" id="home-delivery-checkbox" name="home_delivery" />
+                                            <input type="checkbox" class="form-check-input" id="home-delivery-checkbox" name="home_delivery" checked="checked" />
                                             <label class="form-check-label fw-bold" for="home-delivery-checkbox">Home Delivery</label>
                                         </div>
                                         <div id="delivery-info-alert" class="alert alert-info mt-3 d-none">
                                             <p class="mb-2">
                                                 <i class="fa fa-truck" aria-hidden="true" t-translation="off" />
-                                                <t t-if="group_order.delivery_date and group_order.home_delivery">
+                                                <t t-if="group_order.delivery_date">
                                                     <strong>Delivery Information:</strong> Your order will be delivered at
                                                     <t t-esc="day_names[(int(group_order.pickup_day) + 1) % 7]" />
                                                     <t t-esc="group_order.delivery_date.strftime('%d/%m/%Y')" />
@@ -525,6 +526,7 @@
                                         </div>
                                     </div>
                                 </div>
+                                </t>
                                 <div class="checkout-actions d-grid gap-3" id="checkout-form-labels">
                                     <button class="btn btn-success btn-lg" id="confirm-order-btn" t-attf-data-order-id="{{ group_order.id }}" t-att-data-confirmed-label="labels.get('order_saved_as_draft', 'Order saved as draft')" t-att-data-pickup-label="labels.get('pickup_day_label', 'Pickup Day')" t-att-aria-label="labels.get('save_order_as_draft', 'Save order as draft')" t-att-data-bs-title="labels.get('save_draft', 'Save Draft')" data-bs-toggle="tooltip">
                                         <i class="fa fa-save" aria-hidden="true" t-translation="off" />