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/util/create-schema-validation.js

@@ -0,0 +1,41 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const memoize = require("./memoize");
+
+/** @typedef {import("schema-utils/declarations/validate").ValidationErrorConfiguration} ValidationErrorConfiguration */
+/** @typedef {import("./fs").JsonObject} JsonObject */
+
+const getValidate = memoize(() => require("schema-utils").validate);
+
+/**
+ * @template {object | object[]} T
+ * @param {(function(T): boolean) | undefined} check check
+ * @param {() => JsonObject} getSchema get schema fn
+ * @param {ValidationErrorConfiguration} options options
+ * @returns {function(T=): void} validate
+ */
+const createSchemaValidation = (check, getSchema, options) => {
+	getSchema = memoize(getSchema);
+	return value => {
+		if (check && !check(/** @type {T} */ (value))) {
+			getValidate()(
+				getSchema(),
+				/** @type {object | object[]} */
+				(value),
+				options
+			);
+			require("util").deprecate(
+				() => {},
+				"webpack bug: Pre-compiled schema reports error while real schema is happy. This has performance drawbacks.",
+				"DEP_WEBPACK_PRE_COMPILED_SCHEMA_INVALID"
+			)();
+		}
+	};
+};
+
+module.exports = createSchemaValidation;