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/weak-lru-cache/tests/test.js

@@ -0,0 +1,18 @@
+import { WeakLRUCache } from '../index.js'
+import chai from 'chai'
+const assert = chai.assert
+let cache = new WeakLRUCache()
+
+suite('WeakLRUCache basic tests', function(){
+	test('add entries', function(){
+		let entry = cache.getValue(2)
+		assert.equal(entry, undefined)
+		let obj = {}
+		cache.setValue(2, obj)
+		assert.equal(cache.getValue(2), obj)
+		debugger
+		if (cache.expirer.clean)
+			cache.expirer.clean()
+		assert.equal(cache.getValue(2), obj)
+	})
+})