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/jiti/bin/jiti.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+const { resolve } = require("node:path");
+
+const script = process.argv.splice(2, 1)[0];
+
+if (!script) {
+   
+  console.error("Usage: jiti <path> [...arguments]");
+  process.exit(1);
+}
+
+const pwd = process.cwd();
+const jiti = require("..")(pwd);
+const resolved = (process.argv[1] = jiti.resolve(resolve(pwd, script)));
+jiti(resolved);