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/WarnNoModeSetPlugin.js

@@ -0,0 +1,25 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const NoModeWarning = require("./NoModeWarning");
+
+/** @typedef {import("./Compiler")} Compiler */
+
+class WarnNoModeSetPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.thisCompilation.tap("WarnNoModeSetPlugin", compilation => {
+			compilation.warnings.push(new NoModeWarning());
+		});
+	}
+}
+
+module.exports = WarnNoModeSetPlugin;