Initial commit: notification-elements-demo app

Interactive Angular 19 demo for @sda/notification-elements-ui with
6 sections: Bell & Feed, Notification Center, Inbox, Comments &
Threads, Mention Input, and Full-Featured layout. Includes mock
data, dark mode toggle, and real-time event log.

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

node_modules/@schematics/angular/utility/latest-versions.js

@@ -0,0 +1,22 @@
+"use strict";
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.latestVersions = void 0;
+// We could have used TypeScripts' `resolveJsonModule` to make the `latestVersion` object typesafe,
+// but ts_library doesn't support JSON inputs.
+const dependencies = require('./latest-versions/package.json')['dependencies'];
+exports.latestVersions = {
+    ...dependencies,
+    // As Angular CLI works with same minor versions of Angular Framework, a tilde match for the current
+    Angular: '^19.2.0',
+    NgPackagr: '^19.2.0',
+    DevkitBuildAngular: '^19.2.19',
+    AngularBuild: '^19.2.19',
+    AngularSSR: '^19.2.19',
+};