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/chrome-trace-event/CHANGES.md

@@ -0,0 +1,26 @@
+# node-trace-event changelog
+
+## 1.3.1 (not yet released)
+
+(nothing yet)
+
+
+## 1.3.0
+
+- Add `.child(<fields>)` option to `trace_event.createBunyanTracer()` object.
+
+
+## 1.2.0
+
+- Add `trace_event.createBunyanLogger()` usage for some sugar. See the
+  README.md for details.
+
+
+## 1.1.0
+
+- Rename to 'trace-event', which is a much more accurate name.
+
+
+## 1.0.0
+
+First release.