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/cms/static/store/js/content-pages.js

@@ -20,6 +20,10 @@ function storeContentPagesManager() {
         activeTab: 'platform',
         searchQuery: '',
 
+        // Modal state
+        showDeletePageConfirm: false,
+        pageToDelete: null,
+
         // Data
         platformPages: [],  // Platform default pages
         customPages: [],    // Store's own pages (overrides + custom)
@@ -152,16 +156,14 @@ function storeContentPagesManager() {
             }
         },
 
+        // Prompt delete page confirmation
+        promptDeletePage(page) {
+            this.pageToDelete = page;
+            this.showDeletePageConfirm = true;
+        },
+
         // Delete a page
         async deletePage(page) {
-            const message = page.is_store_override
-                ? `Are you sure you want to delete your override for "${page.title}"? The platform default will be shown instead.`
-                : `Are you sure you want to delete "${page.title}"? This cannot be undone.`;
-
-            if (!confirm(message)) {
-                return;
-            }
-
             try {
                 contentPagesLog.info('Deleting page:', page.id);