fix: replace all native confirm() dialogs with styled modal macros

Migrated ~68 native browser confirm() calls across 74 files to use the
project's confirm_modal/confirm_modal_dynamic Jinja2 macros, providing
consistent styled confirmation dialogs instead of plain browser popups.

Modules updated: core, tenancy, cms, marketplace, messaging, billing,
customers, orders, cart. Uses danger/warning/info variants and
double-confirm pattern for destructive delete operations.

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

app/modules/cart/templates/cart/storefront/cart.html

@@ -1,5 +1,6 @@
 {# app/templates/storefront/cart.html #}
 {% extends "storefront/base.html" %}
+{% from 'shared/macros/modals.html' import confirm_modal %}
 
 {% block title %}Shopping Cart{% endblock %}
 
@@ -107,7 +108,7 @@
                                 </div>
 
                                 <button
-                                    @click="removeItem(item.product_id)"
+                                    @click="pendingRemoveProductId = item.product_id; showRemoveItemConfirm = true"
                                     :disabled="updating"
                                     class="w-10 h-10 flex items-center justify-center border border-gray-300 dark:border-gray-600 rounded hover:bg-red-600 hover:border-red-600 hover:text-white transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
                                     title="Remove from cart"
@@ -165,6 +166,9 @@
     </div>
 
 </div>
+
+<!-- Remove Cart Item Confirm Modal -->
+{{ confirm_modal('removeItemConfirm', 'Remove Item', 'Remove this item from your cart?', 'removeItem(pendingRemoveProductId)', 'showRemoveItemConfirm', 'Remove', 'Cancel', 'danger') }}
 {% endblock %}
 
 {% block extra_scripts %}
@@ -179,6 +183,8 @@ document.addEventListener('alpine:init', () => {
             items: [],
             loading: false,
             updating: false,
+            showRemoveItemConfirm: false,
+            pendingRemoveProductId: null,
 
             // Computed properties
             get totalItems() {
@@ -271,10 +277,6 @@ document.addEventListener('alpine:init', () => {
 
         // Remove item from cart
         async removeItem(productId) {
-            if (!confirm('Remove this item from your cart?')) {
-                return;
-            }
-
             this.updating = true;
 
             try {