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/make-dir/index.d.ts

@@ -0,0 +1,39 @@
+/// <reference types="node"/>
+import * as fs from 'fs';
+
+export interface Options {
+	/**
+	 * Directory [permissions](https://x-team.com/blog/file-system-permissions-umask-node-js/).
+	 *
+	 * @default 0o777 & (~process.umask())
+	 */
+	readonly mode?: number;
+
+	/**
+	 * Use a custom `fs` implementation. For example [`graceful-fs`](https://github.com/isaacs/node-graceful-fs).
+	 *
+	 * Using a custom `fs` implementation will block the use of the native `recursive` option if `fs.mkdir` or `fs.mkdirSync` is not the native function.
+	 *
+	 * @default require('fs')
+	 */
+	readonly fs?: typeof fs;
+}
+
+/**
+ * Make a directory and its parents if needed - Think `mkdir -p`.
+ *
+ * @param path - Directory to create.
+ * @returns A `Promise` for the path to the created directory.
+ */
+export default function makeDir(
+	path: string,
+	options?: Options
+): Promise<string>;
+
+/**
+ * Synchronously make a directory and its parents if needed - Think `mkdir -p`.
+ *
+ * @param path - Directory to create.
+ * @returns The path to the created directory.
+ */
+export function sync(path: string, options?: Options): string;