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/bin/image-size.js

@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+
+var imageSize = require('..');
+
+var files = process.argv.slice(2);
+
+if (!files.length) {
+  console.error('Usage: image-size image1 [image2] [image3] ...');
+  process.exit(-1);
+}
+
+var red = ['\x1B[31m', '\x1B[39m'];
+// var bold = ['\x1B[1m',  '\x1B[22m'];
+var grey = ['\x1B[90m', '\x1B[39m'];
+var green = ['\x1B[32m', '\x1B[39m'];
+
+files.forEach(function (image) {
+  try {
+    if (fs.existsSync(path.resolve(image))) {
+      var size = imageSize(image);
+      var label = green[0] + size.width + green[1] +
+                  grey[0] + 'x' + grey[1] +
+                  green[0] + size.height + green[1];
+      console.info(label, '-', grey[0] + image + grey[1]);
+    } else {
+      console.error('file doesn\'t exist - ', image);
+    }
+  } catch (e) {
+    // console.error(e.stack);
+    console.error(red[0] + e.message + red[1], '-', image);
+  }
+});