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/hyperdyperid/lib/xorshift32.js

@@ -0,0 +1,15 @@
+function makexorshift32() {
+  var x = 1 + Math.round(Math.random() * ((-1>>>0)-1));
+
+  return function xorshift32() {
+    x ^= x << 13;
+    x ^= x >> 17;
+    x ^= x << 5;
+    return x;
+  };
+}
+
+var xorshift32 = makexorshift32();
+
+exports.makexorshift32 = makexorshift32;
+exports.xorshift32 = xorshift32;