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/merchant-edit.js

@@ -18,6 +18,12 @@ function adminMerchantEdit() {
         saving: false,
         merchantId: null,
 
+        // Modal state
+        showToggleVerificationModal: false,
+        showToggleActiveModal: false,
+        showDeleteMerchantModal: false,
+        showDeleteMerchantFinalModal: false,
+
         // Transfer ownership state
         showTransferOwnershipModal: false,
         transferring: false,
@@ -166,11 +172,6 @@ function adminMerchantEdit() {
             const action = this.merchant.is_verified ? 'unverify' : 'verify';
             merchantEditLog.info(`Toggle verification: ${action}`);
 
-            if (!confirm(`Are you sure you want to ${action} this merchant?`)) {
-                merchantEditLog.info('Verification toggle cancelled by user');
-                return;
-            }
-
             this.saving = true;
             try {
                 const url = `/admin/merchants/${this.merchantId}/verification`;
@@ -199,11 +200,6 @@ function adminMerchantEdit() {
             const action = this.merchant.is_active ? 'deactivate' : 'activate';
             merchantEditLog.info(`Toggle active status: ${action}`);
 
-            if (!confirm(`Are you sure you want to ${action} this merchant?\n\nThis will affect all stores under this merchant.`)) {
-                merchantEditLog.info('Active status toggle cancelled by user');
-                return;
-            }
-
             this.saving = true;
             try {
                 const url = `/admin/merchants/${this.merchantId}/status`;
@@ -343,8 +339,8 @@ function adminMerchantEdit() {
             this.userSearchResults = [];
         },
 
-        // Delete merchant
-        async deleteMerchant() {
+        // Prompt delete merchant (first step of double confirm)
+        promptDeleteMerchant() {
             merchantEditLog.info('=== DELETING MERCHANT ===');
 
             if (this.merchant.store_count > 0) {
@@ -352,16 +348,17 @@ function adminMerchantEdit() {
                 return;
             }
 
-            if (!confirm(`Are you sure you want to delete merchant "${this.merchant.name}"?\n\nThis action cannot be undone.`)) {
-                merchantEditLog.info('Merchant deletion cancelled by user');
-                return;
-            }
+            this.showDeleteMerchantModal = true;
+        },
 
-            // Double confirmation for critical action
-            if (!confirm(`FINAL CONFIRMATION: Delete "${this.merchant.name}"?\n\nThis will permanently delete the merchant and all its data.`)) {
-                merchantEditLog.info('Merchant deletion cancelled at final confirmation');
-                return;
-            }
+        // Confirm first step, show final confirmation
+        confirmDeleteMerchantStep() {
+            this.showDeleteMerchantFinalModal = true;
+        },
+
+        // Delete merchant
+        async deleteMerchant() {
+            merchantEditLog.info('=== DELETING MERCHANT (confirmed) ===');
 
             this.saving = true;
             try {