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/str6_36.js

@@ -0,0 +1,15 @@
+const {map3} = require('./maps');
+
+function makestr6_36() {
+  var x = 1 + Math.round(Math.random()*((-1>>>0)-1));
+  return function str6_36() {
+    x ^= x << 13;
+    x ^= x >> 17;
+    x ^= x << 5;
+    var val = x >>> 1;
+    return map3[val % 46656] + map3[(val >> 16) % 46656];
+  }
+}
+
+exports.makestr6_36 = makestr6_36;
+exports.str6_36 = makestr6_36();