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/license-webpack-plugin/dist/WebpackInnerModuleIterator.d.ts

@@ -0,0 +1,10 @@
+/// <reference types="node" />
+import { WebpackChunkModule } from './WebpackChunkModule';
+declare class WebpackInnerModuleIterator {
+    private requireResolve;
+    constructor(requireResolve: RequireResolve);
+    iterateModules(chunkModule: WebpackChunkModule, callback: (module: WebpackChunkModule) => void): void;
+    private internalCallback;
+    getActualFilename(filename: string | null | undefined): string | null;
+}
+export { WebpackInnerModuleIterator };