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/import-fresh/readme.md

@@ -0,0 +1,54 @@
+# import-fresh
+
+> Import a module while bypassing the [cache](https://nodejs.org/api/modules.html#modules_caching)
+
+Useful for testing purposes when you need to freshly import a module.
+
+## ESM
+
+For ESM, you can use this snippet:
+
+```js
+const importFresh = moduleName => import(`${moduleName}?${Date.now()}`);
+
+const {default: foo} = await importFresh('foo');
+```
+
+**This snippet causes a memory leak, so only use it for short-lived tests.**
+
+## Install
+
+```sh
+npm install import-fresh
+```
+
+## Usage
+
+```js
+// foo.js
+let i = 0;
+module.exports = () => ++i;
+```
+
+```js
+const importFresh = require('import-fresh');
+
+require('./foo')();
+//=> 1
+
+require('./foo')();
+//=> 2
+
+importFresh('./foo')();
+//=> 1
+
+importFresh('./foo')();
+//=> 1
+```
+
+## Related
+
+- [clear-module](https://github.com/sindresorhus/clear-module) - Clear a module from the import cache
+- [import-from](https://github.com/sindresorhus/import-from) - Import a module from a given path
+- [import-cwd](https://github.com/sindresorhus/import-cwd) - Import a module from the current working directory
+- [import-lazy](https://github.com/sindresorhus/import-lazy) - Import modules lazily