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/bonjour-service/dist/index.d.ts

@@ -0,0 +1,14 @@
+import Browser, { BrowserConfig } from './lib/browser';
+import Service, { ServiceConfig, ServiceReferer } from './lib/service';
+export declare class Bonjour {
+    private server;
+    private registry;
+    constructor(opts?: Partial<ServiceConfig>, errorCallback?: Function | undefined);
+    publish(opts: ServiceConfig): Service;
+    unpublishAll(callback?: CallableFunction | undefined): void;
+    find(opts?: BrowserConfig | null, onup?: (service: Service) => void): Browser;
+    findOne(opts?: BrowserConfig | null, timeout?: number, callback?: CallableFunction): Browser;
+    destroy(callback?: CallableFunction): void;
+}
+export { Service, ServiceReferer, ServiceConfig, Browser, BrowserConfig };
+export default Bonjour;