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/tenancy/static/admin/js/store-theme.js

@@ -31,6 +31,7 @@ function adminStoreTheme() {
         loading: true,
         saving: false,
         error: null,
+        showResetThemeModal: false,
 
         // Theme data structure matching StoreTheme model
         themeData: {
@@ -272,10 +273,6 @@ function adminStoreTheme() {
         },
 
         async resetTheme() {
-            if (!confirm(I18n.t('tenancy.confirmations.reset_theme'))) {
-                return;
-            }
-
             themeLog.warn('Resetting theme to default');
             this.saving = true;
 
@@ -332,4 +329,4 @@ function adminStoreTheme() {
 // MODULE LOADED
 // ============================================================================
 
-themeLog.info('Store theme editor module loaded');
+themeLog.info('Store theme editor module loaded');