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/webpack/lib/FalseIIFEUmdWarning.js

@@ -0,0 +1,19 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Arka Pratim Chaudhuri @arkapratimc
+*/
+
+"use strict";
+
+const WebpackError = require("./WebpackError");
+
+class FalseIIFEUmdWarning extends WebpackError {
+	constructor() {
+		super();
+		this.name = "FalseIIFEUmdWarning";
+		this.message =
+			"Configuration:\nSetting 'output.iife' to 'false' is incompatible with 'output.library.type' set to 'umd'. This configuration may cause unexpected behavior, as UMD libraries are expected to use an IIFE (Immediately Invoked Function Expression) to support various module formats. Consider setting 'output.iife' to 'true' or choosing a different 'library.type' to ensure compatibility.\nLearn more: https://webpack.js.org/configuration/output/";
+	}
+}
+
+module.exports = FalseIIFEUmdWarning;