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/jiti/lib/index.js

@@ -0,0 +1,15 @@
+function onError(err) {
+  throw err; /* ↓ Check stack trace ↓ */
+}
+
+module.exports = function jiti(filename, opts) {
+  const jiti = require("../dist/jiti");
+
+  opts = { onError, ...opts };
+
+  if (!opts.transform) {
+    opts.transform = require("../dist/babel");
+  }
+
+  return jiti(filename, opts);
+};