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-dev-middleware/dist/utils/ready.js

@@ -0,0 +1,23 @@
+"use strict";
+
+/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */
+/** @typedef {import("../index.js").ServerResponse} ServerResponse */
+
+/**
+ * @template {IncomingMessage} Request
+ * @template {ServerResponse} Response
+ * @param {import("../index.js").FilledContext<Request, Response>} context
+ * @param {(...args: any[]) => any} callback
+ * @param {Request} [req]
+ * @returns {void}
+ */
+function ready(context, callback, req) {
+  if (context.state) {
+    callback(context.stats);
+    return;
+  }
+  const name = req && req.url || callback.name;
+  context.logger.info(`wait until bundle finished${name ? `: ${name}` : ""}`);
+  context.callbacks.push(callback);
+}
+module.exports = ready;