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/@babel/runtime/helpers/createSuper.js

@@ -0,0 +1,16 @@
+var getPrototypeOf = require("./getPrototypeOf.js");
+var isNativeReflectConstruct = require("./isNativeReflectConstruct.js");
+var possibleConstructorReturn = require("./possibleConstructorReturn.js");
+function _createSuper(t) {
+  var r = isNativeReflectConstruct();
+  return function () {
+    var e,
+      o = getPrototypeOf(t);
+    if (r) {
+      var s = getPrototypeOf(this).constructor;
+      e = Reflect.construct(o, arguments, s);
+    } else e = o.apply(this, arguments);
+    return possibleConstructorReturn(this, e);
+  };
+}
+module.exports = _createSuper, module.exports.__esModule = true, module.exports["default"] = module.exports;