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/image-size/Readme.md

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+# image-size
+
+[![NPM Version](https://img.shields.io/npm/v/image-size.svg)](https://www.npmjs.com/package/image-size)
+[![Build Status](https://travis-ci.org/image-size/image-size.svg?branch=master)](https://travis-ci.org/image-size/image-size)
+[![NPM Downloads](https://img.shields.io/npm/dm/image-size.svg)](http://npm-stat.com/charts.html?package=image-size&author=&from=&to=)
+[![Coverage Status](https://img.shields.io/coveralls/image-size/image-size/master.svg)](https://coveralls.io/github/image-size/image-size?branch=master)
+[![devDependency Status](https://david-dm.org/image-size/image-size/dev-status.svg)](https://david-dm.org/image-size/image-size#info=devDependencies)
+
+A [Node](https://nodejs.org/en/) module to get dimensions of any image file
+
+## Supported formats
+
+* BMP
+* GIF
+* JPEG
+* PNG
+* PSD
+* TIFF
+* WebP
+* SVG
+* DDS
+
+### Upcoming
+
+* SWF
+
+## Programmatic Usage
+
+```
+npm install image-size --save
+```
+
+### Synchronous
+
+```javascript
+var sizeOf = require('image-size');
+var dimensions = sizeOf('images/funny-cats.png');
+console.log(dimensions.width, dimensions.height);
+```
+
+### Asynchronous
+
+```javascript
+var sizeOf = require('image-size');
+sizeOf('images/funny-cats.png', function (err, dimensions) {
+  console.log(dimensions.width, dimensions.height);
+});
+```
+NOTE: The asynchronous version doesn't work if the input is a Buffer. Use synchronous version instead.
+
+### Using a URL
+
+```javascript
+var url = require('url');
+var http = require('http');
+
+var sizeOf = require('image-size');
+
+var imgUrl = 'http://my-amazing-website.com/image.jpeg';
+var options = url.parse(imgUrl);
+
+http.get(options, function (response) {
+  var chunks = [];
+  response.on('data', function (chunk) {
+    chunks.push(chunk);
+  }).on('end', function() {
+    var buffer = Buffer.concat(chunks);
+    console.log(sizeOf(buffer));
+  });
+});
+```
+
+You can optionally check the buffer lengths & stop downloading the image after a few kilobytes.
+**You don't need to download the entire image**
+
+## Command-Line Usage (CLI)
+
+```
+npm install image-size --global
+image-size image1 [image2] [image3] ...
+```
+
+## Credits
+
+not a direct port, but an attempt to have something like
+[dabble's imagesize](https://github.com/dabble/imagesize/blob/master/lib/image_size.rb) as a node module.
+
+## [Contributors](Contributors.md)