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/@jsonjoy.com/fs-core/README.md

@@ -0,0 +1,34 @@
+# @jsonjoy.com/fs-core
+
+Core filesystem primitives for building in-memory and virtual filesystems.
+
+## Overview
+
+This package provides the core data structures for representing a virtual filesystem:
+
+- **Node** - Represents an i-node (index node), containing file data and metadata
+- **Link** - Represents a hard link pointing to a Node
+- **File** - Represents an open file descriptor
+- **Superblock** - The root of a virtual filesystem, managing nodes and links
+
+## Installation
+
+```bash
+npm install @jsonjoy.com/fs-core
+```
+
+## Usage
+
+```typescript
+import { Superblock, DirectoryJSON } from '@jsonjoy.com/fs-core';
+
+// Create a new filesystem
+const fs = new Superblock();
+
+// Or create from a JSON structure
+const json: DirectoryJSON = {
+  '/file.txt': 'Hello, World!',
+  '/dir/nested.txt': 'Nested content',
+};
+const fs = Superblock.fromJSON(json);
+```