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/ModuleCache.d.ts

@@ -0,0 +1,10 @@
+import { LicenseIdentifiedModule } from './LicenseIdentifiedModule';
+interface ModuleCache {
+    registerModule(chunkName: string, module: LicenseIdentifiedModule): void;
+    markSeenForChunk(chunkName: string, packageName: string): void;
+    alreadySeenForChunk(chunkName: string, packageName: string): boolean;
+    getModule(packageName: string): LicenseIdentifiedModule | null;
+    getAllModulesForChunk(chunkName: string): LicenseIdentifiedModule[];
+    getAllModules(): LicenseIdentifiedModule[];
+}
+export { ModuleCache };