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/class/files/__name@dasherize____type__.spec.ts.template

@@ -0,0 +1,7 @@
+import { <%= classify(name) %> } from './<%= dasherize(name) %><%= type %>';
+
+describe('<%= classify(name) %>', () => {
+  it('should create an instance', () => {
+    expect(new <%= classify(name) %>()).toBeTruthy();
+  });
+});

node_modules/@schematics/angular/class/files/__name@dasherize____type__.ts.template

@@ -0,0 +1,2 @@
+export class <%= classify(name) %> {
+}