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/needle/examples/digest-auth.js

@@ -0,0 +1,16 @@
+var needle = require('./..');
+
+var opts = {
+  username: 'user3',
+  password: 'user3',
+  auth: 'digest'
+}
+
+needle.get('http://test.webdav.org/auth-digest/', opts, function(err, resp, body) {
+  console.log(resp.headers);
+
+  if (resp.statusCode == 401)
+    console.log('\nIt failed.')
+  else
+    console.log('\nIt worked!')
+});