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/@schematics/angular/server/schema.d.ts

@@ -0,0 +1,21 @@
+/**
+ * Sets up server-side rendering (SSR) for your Angular application. SSR allows your app to
+ * be rendered on the server, improving initial load performance and SEO. This schematic
+ * configures your project for SSR and generates the necessary files.
+ */
+export type Schema = {
+    /**
+     * The name of the project to enable server-side rendering for.
+     */
+    project: string;
+    /**
+     * Configure the server application to use the Server Routing and App Engine APIs (Developer
+     * Preview).
+     */
+    serverRouting?: boolean;
+    /**
+     * Skip the automatic installation of packages. You will need to manually install the
+     * dependencies later.
+     */
+    skipInstall?: boolean;
+};