docs: add confirm_modal_dynamic documentation to components page

Added documentation and interactive examples for both confirm_modal
and confirm_modal_dynamic macros, showing danger, warning, info variants
and dynamic message capabilities.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/admin/js/components.js

@@ -429,6 +429,12 @@ function adminComponents() {
         showLogModal: false,
         exampleLog: null,
 
+        // Confirm modal demo state
+        showConfirmModalDemo: false,
+        confirmModalVariant: 'danger',
+        showDynamicConfirmDemo: false,
+        dynamicItemName: '',
+
         // Example log data for demo
         showErrorLogDemo() {
             this.exampleLog = {