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/@nodelib/fs.stat/out/index.d.ts

@@ -0,0 +1,12 @@
+import type { FileSystemAdapter, StatAsynchronousMethod, StatSynchronousMethod } from './adapters/fs';
+import * as async from './providers/async';
+import Settings, { Options } from './settings';
+import type { Stats } from './types';
+declare type AsyncCallback = async.AsyncCallback;
+declare function stat(path: string, callback: AsyncCallback): void;
+declare function stat(path: string, optionsOrSettings: Options | Settings, callback: AsyncCallback): void;
+declare namespace stat {
+    function __promisify__(path: string, optionsOrSettings?: Options | Settings): Promise<Stats>;
+}
+declare function statSync(path: string, optionsOrSettings?: Options | Settings): Stats;
+export { Settings, stat, statSync, AsyncCallback, FileSystemAdapter, StatAsynchronousMethod, StatSynchronousMethod, Options, Stats };