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/clone-deep/index.js

@@ -0,0 +1,49 @@
+'use strict';
+
+/**
+ * Module dependenices
+ */
+
+const clone = require('shallow-clone');
+const typeOf = require('kind-of');
+const isPlainObject = require('is-plain-object');
+
+function cloneDeep(val, instanceClone) {
+  switch (typeOf(val)) {
+    case 'object':
+      return cloneObjectDeep(val, instanceClone);
+    case 'array':
+      return cloneArrayDeep(val, instanceClone);
+    default: {
+      return clone(val);
+    }
+  }
+}
+
+function cloneObjectDeep(val, instanceClone) {
+  if (typeof instanceClone === 'function') {
+    return instanceClone(val);
+  }
+  if (instanceClone || isPlainObject(val)) {
+    const res = new val.constructor();
+    for (let key in val) {
+      res[key] = cloneDeep(val[key], instanceClone);
+    }
+    return res;
+  }
+  return val;
+}
+
+function cloneArrayDeep(val, instanceClone) {
+  const res = new val.constructor(val.length);
+  for (let i = 0; i < val.length; i++) {
+    res[i] = cloneDeep(val[i], instanceClone);
+  }
+  return res;
+}
+
+/**
+ * Expose `cloneDeep`
+ */
+
+module.exports = cloneDeep;